Different Forms and Proportions of Exogenous Nitrogen Promote the Growth of Alfalfa by Increasing Soil Enzyme Activity
Abstract
:1. Introduction
2. Results
2.1. Soil Enzyme Activities
2.2. Soil Physicochemical Characteristics
2.3. The Key Soil Factors Affecting Soil Enzyme Activities
2.4. Plant Characteristics
2.5. Relationships between Biomass of Alfalfa with Soil Properties and Enzyme Activities
3. Discussion
3.1. Effects of Different Forms and Proportions of Exogenous Nitrogen on Hydrolase Activity
3.2. Effects of Different Forms and Proportions of Exogenous Nitrogen on Oxidordeuctase Activity
4. Material and Methods
4.1. Experiment Design and Soil Sample
4.2. Soil Properties
4.3. Soil Enzyme Activities
4.4. Statistical Analysis
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Items | Treatments | |||||
---|---|---|---|---|---|---|
N0 | N1 | N2 | N3 | N4 | N5 | |
Organic matter (g kg−1) | 13.80 ± 0.11 bc | 15.58 ± 0.65 a | 15.25 ± 0.22 a | 14.80 ± 0.15 ab | 13.29 ± 0.30 c | 14.15 ± 0.15 bc |
Total N (g kg−1) | 0.73 ± 0.01 d | 0.80 ± 0.01 c | 0.93 ± 0.00 a | 0.80 ± 0.01 c | 0.74 ± 0.01 d | 0.87 ± 0.01 b |
NO3−N (mg kg−1) | 5.84 ± 0.08 d | 16.16 ± 0.51 a | 13.81 ± 0.71 b | 15.64 ± 0.44 a | 11.95 ± 0.63 c | 13.88 ± 0.52 b |
NH4+-N (mg kg−1) | 2.09 ± 0.02 e | 2.83 ± 0.02 d | 5.19 ± 0.04 a | 3.15 ± 0.01 c | 2.76 ± 0.01 d | 4.57 ± 0.05 b |
AP (mg kg−1) | 40.65 ± 0.43 b | 44.61 ± 1.30 a | 44.72 ± 0.56 a | 39.41 ± 0.39 b | 45.02 ± 0.91 a | 41.13 ± 0.49 b |
AK (mg kg−1) | 69.88 ± 0.13 c | 78.25 ± 0.43 a | 72.03 ± 2.52 bc | 62.54 ± 0.21 d | 70.20 ± 0.53 bc | 73.56 ± 0.66 b |
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Zhao, Y.; Wang, Y.; Sun, S.; Liu, W.; Zhu, L.; Yan, X. Different Forms and Proportions of Exogenous Nitrogen Promote the Growth of Alfalfa by Increasing Soil Enzyme Activity. Plants 2022, 11, 1057. https://doi.org/10.3390/plants11081057
Zhao Y, Wang Y, Sun S, Liu W, Zhu L, Yan X. Different Forms and Proportions of Exogenous Nitrogen Promote the Growth of Alfalfa by Increasing Soil Enzyme Activity. Plants. 2022; 11(8):1057. https://doi.org/10.3390/plants11081057
Chicago/Turabian StyleZhao, Yi, Yuqiang Wang, Shengnan Sun, Wentao Liu, Ling Zhu, and Xuebing Yan. 2022. "Different Forms and Proportions of Exogenous Nitrogen Promote the Growth of Alfalfa by Increasing Soil Enzyme Activity" Plants 11, no. 8: 1057. https://doi.org/10.3390/plants11081057