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Article

Soil Amendment with Biosolids and Inorganic Fertilizers: Effects on Biochemical Properties and Oxidative Stress in Basil (Ocimum basilicum L.)

by
Nadia de la Portilla
1,
Rocio Vaca
1,
Martha E. Mora-Herrera
2,
Liliana Salinas
1,
Pedro del Aguila
1,
Gustavo Yañez-Ocampo
1 and
Jorge Lugo
1,*
1
Laboratorio de Edafología y Ambiente, Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario No. 100, Toluca 50000, Mexico
2
Laboratorio de Fisiología y Biotecnología Vegetal, Centro Universitario Tenancingo, Universidad Autónoma del Estado de México, Instituto Literario No. 100, Toluca 50000, Mexico
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(8), 1117; https://doi.org/10.3390/agronomy10081117
Submission received: 23 June 2020 / Revised: 23 July 2020 / Accepted: 28 July 2020 / Published: 1 August 2020
(This article belongs to the Special Issue Soil Quality Evaluation Using Biological Properties)
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Abstract

:
We investigated changes in biochemical activity of a soil cultivated with Ocimum basilicum L. plants and in the oxidative stress of plants caused by the addition of biosolids and inorganic fertilizer. A greenhouse experiment was set up; it consisted of pots containing basil plants to which different treatments with biosolids and fertilizers were added. After 10 and 210 days of the incorporation of the treatments, both the biochemical properties and oxidative stress of the plants were evaluated. Mineralization of nitrogen (N) and respiratory activity increased with a higher dose of biosolid after 10 days of application. After 210 days, there were no changes in the mineralization of N and respiratory activity, catalase showed an increase, while microbial biomass carbon decreased. In relation to the oxidative stress, there was a decrease in the anthocyanin antioxidant capacity, and 2,2-diphenyl-1-picrylhydrazyl (DPPH), total flavonoids, and phenolic compounds were observed in soils treated with biosolids. The results indicated that the biochemical properties of the soil were favored in the presence of biosolids because they increased, especially after 10 days of application. The antioxidant capacity decreased in the presence of biosolids, which suggests that the amendment does not affect such capacity, and therefore oxidative stress could be reduced.

1. Introduction

It is generally recognized that the use of biosolids for agricultural purposes provides nutrients to soil, increases the content of organic matter (OM) and soil enzyme activities related to biogeochemical cycles such as C, N, and P, and promotes the proliferation of vegetation and favors soil aggregation [1,2,3,4,5,6]. However, its addition affects the quality of the soil, altering the physical, chemical, and biochemical characteristics of the soil [7]. Quality evaluation is usually made considering its biochemical properties [8]. Among the biochemical soil properties, the most outstanding are those involved with the microbial activity (microbial biomass C and N, respiration etc.), and the activities of extracellular hydrolytic enzymes related to C, N, S, and P cycles in soil [9,10,11].
The effects of biosolids on soil quality can be evaluated through the use of indicators such as microbial biomass content, metabolic quotient (qCO2), microbial C-to-organic C ratio, and soil enzymatic activities. In the same manner, the application of biosolids can either induce soil microbial activity, due to an increase in available carbon and nutrients, or inhibit activity, due to the presence of heavy metals and other pollutants [12,13].
Heavy metals contained in biosolids can induce elevated levels of reactive oxygen species (ROS) in plants cultivated in soils added with biosolids [14,15]. It is generally accepted that plants respond to stresses caused by biotic and abiotic factors as a result of the presence of ROS, such as superoxide, hydrogen peroxide (H2O2), and hydroxyl radical. This ROS generation produces oxidative stress in plants, because ROS can damage DNA, protein, chlorophyll, and membrane functions. Following this argument, a plant’s ability to control ROS balance could be correlated with an increase in tolerance to these stresses. To decrease and repair the damage caused by ROS, plants have developed a complex antioxidant system. For this reason, the role of antioxidant systems in protecting plants against such cellular stress is very important [16,17].
Ocimum basilicum L. (basil) is one of the essential crops for oil production in the world, as it contains linalool, eugenol, methyl eugenol, carvacrol, and cariophilin. It is cultivated in many countries because these oils are of economic importance within the perfume and cosmetic industry. In addition, some studies have reported that sweet basil contains high concentrations of phenolic compounds (rosmarinic and caffeic acid), which are characterized by their high antioxidant capacities [18,19,20,21].
Therefore, the objective of this work was to determine the effect of biosolids and inorganic fertilizer addition on the soil biochemical properties and oxidative stress of basil plants (Ocimium basilicum L.).

2. Materials and Methods

2.1. Soil and Biosolids Sampling

Soil was collected from Ap. horizon (0–20 cm), applying a systematic sampling in Academic Unit “El Cerrillo”, Autonomous University of the State of Mexico. This soil was characterized as clay loam, Cambisol soil [22]. The principal characteristics in the 0-20 cm layer Ap horizon, were as follows: pH 6.45; electric conductivity (EC) 0.013 ds/cm; OM 5.28%; total N 0.35% and cation exchange capacity (CEC) 25.95 cmol kg−1. The biosolid used in this work was collected from the municipal wastewater Toluca Norte, operator ECOSYS, Toluca Mexico. The biosolids characteristics were the following: pH 5.88; EC 0.028 ds/cm; OM 46.28%; total N 33.95% and CEC 25.95 cmol kg−1. The fertilizer (F) used in the experiment was made up of urea (N), potassium chloride (K) and calcium phosphate (P).

2.2. Experimental Design

The experimental treatment included plots were cropped with Ocimum basilicum L. as follows:
  • Soil without fertilizer or biosolid (control), S
  • Soil + fertilizer (N:P:K 100:40:40), SF
  • Soil + fertilizer (N:P:K 50:20:20), biosolid (10 t ha−1), SF50B10
  • Soil + fertilizer (N:P:K 25:10:10), biosolid (20 t ha−1), SF25B20
  • Soil + biosolid (40 t ha−1), SB40
The treatments were arranged in a completely randomized block design in a greenhouse. Soil subsamples were randomly collected 10 and 210 days after the fertilizer and/or biosolid addition from the surface layer (0–10 cm) of each plot. The mass of the pot was 3 kg. For the chemical characterization, a composite sample was obtained from subsamples of the repetitions of each of the treatments. Prior to chemical analyses, all samples were air dried and grounded in an agate mortar, homogenized and sieved to <2 mm, and stored in plastic bags at room temperature. Soil samples for microbiological analyses were stored at 4 °C, at field moisture.

2.3. Soil Biochemical Properties

Inorganic nitrogen was determined with 2N KCl and by Kjeldahl [23]. Microbial biomass carbon (MBC) was determined by fumigating with chloroform and extraction with K2SO4 [24].
The respiratory activity was estimated by quantifying the carbon dioxide (CO2) released by microbial activity in 21 days of incubation at 25 °C [25]. The metabolic quotient (qCO2) was calculated as the ratio of basal respiration to microbial biomass [26]. Catalase activity was evaluated by measuring the O2 consumed by KMnO4 after addition of H2O2 to the samples [27]

2.4. Oxidative Stress Analysis Basil (Ocimum basilicum L.)

After 210 days, fresh leaf tissue (0.2 g) was grounded in a mortar and extraction was done by using 10 mL of metanol (50%). The oxidative stress analyses performed were: total phenolic content (measured using Folin & Ciocalteu’s method [28]), DPPH [29], peroxidase activity (POX) [30], flavonoid content [31], and anthocyanins [32].

2.5. Statistical Analysis

The data obtained were subjected to analysis of variance (ANOVA) and the differences found between the means were compared with an LSD test using Statgraphiscs Centurion version XVI using a confidence level of 95%.

3. Results

3.1. Soil Biochemical Properties

Nitrogen Mineralization

Nitrogen mineralization, inorganic N, and N-NH4+ increased significantly with a higher dose of biosolid (SB40), compared with other treatments (S, SF, SF50B10 and SF25B20) 10 days after its application. Then, NO2− and NO3− showed significant differences in SF50B10 (p < 0.05) compared to other treatments (Figure 1). Inorganic nitrogen and N-NH4+ increased significantly in SB40 compared with other treatments (p < 0.05). With respect to NO3− and NO2−, the treatments with biosolid showed an increase compared to SF and S (Figure 1).
In the period of 210 days after the addition of biosolids and fertilizer, N mineralization showed no significant difference in any of the treatments (p > 0.05), and nitrogen mineralization lower than that recorded 10 days after biosolids application. Total inorganic N, NH4+, and NO3− and NO2− showed the lowest values with 3.7, 2.1, and 1.6 mg/Kg respectively for treatment S; while the highest values were seen for treatment SF25B20 for total inorganic N and NH4+ with 4.8 and 3.3 mg/Kg respectively, and for NO3− and NO2− the SF treatment had the highest value with 1.8 mg/Kg.

3.2. Soil Microbial Biomass, Soil Respiration, and qCO2

Table 1 shows biochemical soil properties 10 and 210 days after amendment with fertilizer and/or biosolids. There were no significant differences (p > 0.05) in MBC between the treatments after 10 days of application, but there were differences after 210 days. There was a drastic decrease in MBC between 210 and 10 days. MBC was significantly higher in SB40 compared with other treatments, showing the highest value (p < 0.05) after 210 days.
Respiratory activity was significantly higher in SB40 compared to other treatments (p < 0.05), after 10 days of biosolid application (p < 0.05), while at 210 days after the incorporation no significant differences between treatments were observed (p > 0.05). 210 days after biosolid incorporation there were no significant differences in the variety of treatments and the respiration rate was lower (S 2858.3 mg CO2/g soil; SF 2716.2 mg CO2/g soil; SF50B10 3282.0 mg CO2/g soil; SF25B20 3331.5 mg CO2/g soil; SB40 3495.2 mg CO2/g soil) compared with 10 days (S 2628.0 mg CO2/g soil; SF 2995.5 mg CO2/g soil; SF50B10 3302.3 mg CO2/g soil; SF25B20 4376.3 mg CO2/g soil; SB40 6564.7 mg CO2/g soil)(Table 1).

3.3. Catalase Activity

The results found showed that at 10 days of biosolid addition, SB40 treatment showed the highest values compared to the other treatments. Will at 210 days of biosolid addition the results are generally higher in all treatments with respect to 10 days with the exception of SB40.

3.4. Oxidative Stress in Basil (Ocimum basilicum L.)

Figure 2 shows total phenolic content (TP) of basil cultivated in a soil amended with biosolids and inorganic fertilizer at different doses. In this research, TP was significantly highest in S compared with the other treatments, so that basil plants cultivated in soil amended with biosolid showed the lowest content. The antioxidant DPPH was highest in treatments S and SF (p < 0.05, Figure 3).
Peroxidase activity (POX) was significantly higher in S and SB40 (p < 0.05) compared to SF, SF50B10, and SF25B20 (Figure 4). The content of flavonoids and anthocyanins in basil was significantly greater in the control than any of the amended soils (p < 0.05, Figure 5 and Figure 6).

4. Discussion

4.1. Soil Biochemical Properties

Nitrogen Mineralization

The addition of biosolid to the soil significantly increased the total inorganic nitrogen and the NH4 content; these increases are directly related to the application rate, which means that the dose with 40 t ha−1 was the one with the highest mineralization of N in 10 days according to Rodríguez et al. [33]. While mineralization rates are at their highest during the first two weeks and decrease over time, nitrogen labile is depleted. The above can be associated with the fact that the main nutrient value of organic matter contained in the biosolid lies in its nitrogen content. Nitrogen availability is entirely dependent on the rate of organic matter decomposition, the soil microorganisms present in the biosolid are of great importance when transforming organic matter into inorganic compounds available to plants, with their decomposition activity and nitrogen mineralization [34,35,36].
Soil nitrogen mineralization decreased with time (210 days). This decrease could be due to the initial decomposition of the labile organic N. The more the labile organic disappears and the more the recalcitrant organic N predominates in the organic N pool, the rate of mineralization is expected to be lower [37].
In relation to the amount of NO3− and NO2−, results can be explained due to the addition of fertilizer; the biosolids have the disadvantage of being more difficult to assimilate because of the cell’s higher energy costs [14,38].

4.2. Microbial Biomass Carbon, Soil Respiration and qCO2

The supply of high concentrations of both easily degradable carbon and nutrients are two key factors that determine the proliferation and growth of the microbial population in the soil [39,40,41]. The biosolid rich in these factors positively influenced MBC. The initial increase of soil microbial biomass 10 days after biosolid incorporation can be attributed either to the incorporation of the easily biodegradable organic matter—which stimulates autochtonous microbial activities in the soil—or to a new microbial biomass already grown in the biosolid added to the soil.
A decrease in MBC was observed 210 days after the application of biosolids, however an increase in MBC content was related with the highest rate of biosolid addition due the high OM content of biosolids [38]. About the depletion of MBC content after 210 days, it was reported that the carbon content decreased rapidly after 60 days of the incorporation of the OM, indicating the presence of a high proportion of readily degradable organic compounds [42]. High organic matter content and high N content of the biosolid acted as potential sources of food and energy for the heterotrophic microorganisms, which had high microbial biomass C values. The substrate-C induces the growth of the autochthonous soil microbiota due to the high availability of energy sources [43,44].
With respect to 10 days after application of biosolids, Pedra et al. [41] mentioned that the CO2- C rate evolution was high during the first days of incubation with different types of OM. In this case the biosolids (40 T ha−1) generally promote a short-term positive effect on soil respiration [45]. The initial increase in respiratory activity can be attributed to the addition of easily biodegradable material that stimulates soil microbial activity and accelerates the mineralization rate. Additionally, an increase in the soil organic matter and the soil microbial biomass was expected, due to the easily available carbon incorporation for the native soil microorganisms. As a consequence of this energetic contribution, soil heterotrophic activity increased, enhancing the soil basal respiration and the carbon mineralization. The decrease in respiratory activity at 210 days could be explained by a decrease in the forms of labile carbon and its rapid mineralization processes [45,46].
If the high C mineralization is coupled with low qCO2, the SOM balance will be favorable even with the high C mineralization. A higher C mineralization together with a lower metabolic quotient in biosolids amended soil suggests the increase in soil C mineralization will still lead to SOM accumulation [47].
Tarrason et al. [48] indicates that the existence of less stable organic matter can increase metabolic rate values; this may be related to the values obtained from respiratory activity and microbial biomass carbon in which one can observe a decrease in mineralization C, unlike that found in the 10 days after application of each of the treatments.

4.3. Catalase Activity

The catalase activity of the soil amended with biosolid increased significantly up to 30 days, and then the values remained significantly higher than those of the control, which could have been due to the activation of the aerobic microorganisms caused by the high organic load biosolid [49]. Pascual et al. [49] and Fernández et al. [50] found that the incorporation into the soil of the low dose of organic materials did not improve soil catalase activity with respect to the unamended soil, while the high dose of these materials increased significantly this activity. This suggests that the addition of a considerable amount of organic matter is needed to stimulate soil catalase activity. This could explain the increased activity of catalase 210 days after the incorporation of biosolids.

4.4. Oxidative Stress Basil (Ocimum basilicum L.)

A decrease in the contents of phenolic compounds, DPPH, peroxidase activity, flavonoids, and anthocyanins was observed in the treatments to which biosolids were added in basil plants (O, basilicum). Plants develop enzymatic defense mechanisms (superoxide dismutase, catalase, and peroxidase) and non–enzymatic mechanisms in large proportions [51] and accumulate phenolic compounds, which is considered an adaptative response of plants to these adverse environmental conditions [52,53]. Specifically, an increase in the metabolism of phenolic compounds and some enzymes, such as peroxidase, has been reported under stress by heavy metals [54,55,56]. This suggest that the amendment with biosolids did not lead to an accumulation of heavy metal in basil plants.
Excess heavy metals in biosolids have been found to cause adverse effects on plants, including increased oxidative stress [52,53]. Patel et al. [55] reported a significantly increased enzyme activity on oil yield basil by increasing the amount of biosolids from the tanning industry, although biosolids incorporated in the basil crop were the municipal type; these might have influenced the increase in enzyme activity. Singh and Agrawal [56] found that peroxidase activity also increased significantly in Beta vulgaris plants grown under biosolids amendment. Furthermore, it was found that the highest concentrations of heavy metals could prevent the action by POX increase [52]. With these pieces of evidence, the concentration of metals present in the biosolids was possibly so low that it did not induce the antioxidant capacity of basil plants.
Plants in the Lamiaceae family contain phenolic compounds, flavonoids, and anthocyanins that are strong antioxidants, free radical scavengers, and metal chelators, and this may explain the low content of phenolic compounds, flavonoids, and anthocyanins found in biosolid treatments [57,58].
However, it must be ensured that the heavy metals levels in the biosolid remain within the acceptable limits, since their concentrations vary significantly depending on their origin.

5. Conclusions

This study demonstrated that biosolids could be used in basil cultivation because positive effects were observed both in the soil and in the physiology of the plant. Biosolid addition without inorganic fertilizer (SB40) increased mineralization of N and respiratory activity, and decreased metabolic coefficient (qCO2) ten days later, while at 210 days it decreased with the exception of qCO2. The microbial biomass carbon and catalase activity increased at 210 days after treatment application. The antioxidant capacity of anthocyanins, phenolic compounds, DPPH, and flavonoids decreased in the presence of the biosolids, which could be an indicative of a reduction in oxidative stress by basil plants (Ocimum basilicum L.). However, a full recommendation should make measurements for shorter periods and perhaps measure some other properties of the plant.

Author Contributions

N.d.l.P.: Performed investigations and wrote the original draft. R.V.: advised on the design of the experiment and analyzed the data. M.E.M.-H.: Advised on the analysis carried out in the plants and provided the equipment and reagents. P.d.A.: Facilitated the obtaining of reagents and equipment to perform soil analyzes. G.Y.-O. and L.S. reviewed the writing of the article and the statistics. J.L.: Reviewed the results obtained, reviewed the English of the article and made corrections. All authors have read and agreed to the published version of the manuscript.

Funding

The research of the paper was supported by Universidad Autónoma del Estado de México. (UAEMex, Grant No. 3738/2014/CID).

Acknowledgments

The authors thank the Consejo Nacional de Ciencia y Tecnología (CONACyT) for the student grant.

Conflicts of Interest

The authors declare no conflict of interest.

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Agronomy 10 01117 g001 550
Figure 1. Nitrogen mineralization in S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1) after 10 days of treatment application. Means ± standard error, bars with different letters (a, b, c) are significantly different according to the LSD test (p < 0.05). 10 days after fertilizer and/or biosolid application.
Figure 1. Nitrogen mineralization in S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1) after 10 days of treatment application. Means ± standard error, bars with different letters (a, b, c) are significantly different according to the LSD test (p < 0.05). 10 days after fertilizer and/or biosolid application.
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Figure 2. Total phenolic compounds in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b, c) are significantly different according to LSD test (p < 0.05).
Figure 2. Total phenolic compounds in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b, c) are significantly different according to LSD test (p < 0.05).
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Figure 3. DPPH in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
Figure 3. DPPH in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
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Figure 4. Peroxidase activity (POX) in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
Figure 4. Peroxidase activity (POX) in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
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Figure 5. Flavonoid content in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
Figure 5. Flavonoid content in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
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Figure 6. Anthocyanins content in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
Figure 6. Anthocyanins content in basil (Ocimum basilicum L.) cultivated in a soil with treatments, S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Means ± standard error, bars with different letters (a, b) are significantly different according to LSD test (p < 0.05).
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Table
Table 1. Biochemical properties of soil amended with biosolids and inorganic fertilizer at 10 and 210 days after application.
Table 1. Biochemical properties of soil amended with biosolids and inorganic fertilizer at 10 and 210 days after application.
Soil Microbial Biomass Carbon
(μg g−1)		Soil Respiration
(mg CO2/g soil)		qCO2Catalase Activity
(Moles H2O2 Consumed g−1h−1)		Soil Microbial Biomass Carbon
(μg g−1)		Soil Respiration
(mg CO2/g soil)		qCO2Catalase Activity
(Moles H2O2 Consumed g−1h−1)
10 days210 days
S895.7 a
(71.4)		2628.0 c (102.7)1.670.28 b
(0.05)		265.4 b
(40.2)		2858.3 a
(202.6)		6.120.48 a
(0.03)
SF879.0 a
(69.7)		2995.5 c (174.4)1.940.25 b
(0.04)		328.0 b
(37.2)		2716.2 a
(156.5)		4.710.41 a
(0.04)
SF50B10924.3 a
(80.0)		3302.3 c (137.0)2.030.32 b
(0.07)		348.2 b
(66.8)		3282.0 a
(276.7)		5.360.45 a
(0.03)
SF25B201029.9 a (129.5)4376.3 b (342.3)2.410.32 b
(0.05)		388.2 b
(60.1)		3331.5 a
(278.3)		4.880.36 a
(0.05)
SB401059.1 a (160.8)6564.7 a (306.1)3.520.70 a
(0.10)		626.9 a
(160.0)		3495.2 a
(183.3)		3.170.51 a
(0.03)
S, soil without fertilizer (control); SF, soil + fertilizer (N:P:K 100:40:40); SF50B10, soil + fertilizer (N:P:K, 50:20:20) + biosolid (10 t ha−1); SF25B20, soil + fertilizer (N:P:K, 25:10:10) + biosolid (20 t ha−1) and SB40, soil + biosolid (40 t ha−1). Numbers within a column followed by the same letter are not significantly different at the 0.05 probability level in accordance with LSD test. Means (standard error). Ten days after biosolid application, qCO2 was numerically greater in the treatments with highest doses of biosolids (SB40 3.52), however, seven months after application of biosoilds, qCO2 showed an increase in all treatments except in SB40 (3.17) (Table 1).

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de la Portilla, N.; Vaca, R.; Mora-Herrera, M.E.; Salinas, L.; del Aguila, P.; Yañez-Ocampo, G.; Lugo, J. Soil Amendment with Biosolids and Inorganic Fertilizers: Effects on Biochemical Properties and Oxidative Stress in Basil (Ocimum basilicum L.). Agronomy 2020, 10, 1117. https://doi.org/10.3390/agronomy10081117

AMA Style

de la Portilla N, Vaca R, Mora-Herrera ME, Salinas L, del Aguila P, Yañez-Ocampo G, Lugo J. Soil Amendment with Biosolids and Inorganic Fertilizers: Effects on Biochemical Properties and Oxidative Stress in Basil (Ocimum basilicum L.). Agronomy. 2020; 10(8):1117. https://doi.org/10.3390/agronomy10081117

Chicago/Turabian Style

de la Portilla, Nadia, Rocio Vaca, Martha E. Mora-Herrera, Liliana Salinas, Pedro del Aguila, Gustavo Yañez-Ocampo, and Jorge Lugo. 2020. "Soil Amendment with Biosolids and Inorganic Fertilizers: Effects on Biochemical Properties and Oxidative Stress in Basil (Ocimum basilicum L.)" Agronomy 10, no. 8: 1117. https://doi.org/10.3390/agronomy10081117

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