Application of nitrogen and phosphorus improve alfalfa (Medicago sativa L.) yield and nutritional quality under swine wastewater irrigation by regulating shoots osmoregulation substances.

Autor: Tian, Liu, Dong, Xinliang, Wang, Jintao, Zhang, Xuejia, Lou, Boyuan, Liu, Xiaojing, Guo, Kai, Sun, Hongyong
Předmět:
Zdroj: Journal of Soils & Sediments: Protection, Risk Assessment, & Remediation; Nov2023, Vol. 23 Issue 11, p3761-3775, 15p
Abstrakt: Purpose: Treated wastewater irrigation has become an effective measure to alleviate the shortage of water resources. To date, there has been no information on the interaction between the application of N and P fertilizers and wastewater. This study aimed to elucidate the regulatory mechanism of N and P on the growth of leguminous plant alfalfa under wastewater irrigation. Methods: A pot experiment was carried out with nine treatments of different N and P fertilizers additions during the three crop seasons. All treatments were irrigated with treated swine wastewater. And the effects of N and P addition on alfalfa yield, nutritional quality, antibiotic accumulation, and related stress physiological indicators under swine wastewater irrigation conditions were evaluated. Results: The results showed that N addition could significantly increase the total fresh weight, water use efficiency and total crude protein accumulation of alfalfa shoots by 9.89%-15.70%, 5.48%-9.98% and 8.49%-18.30%, respectively. The content of four antibiotics introduced by wastewater irrigation decreased by 18.18%-116.67% after the addition of N and P compared with no fertilizer treatment, and N treatment significantly reduced the total accumulation of antibiotics in each pot by 5.55%-50.00%. More proline and soluble sugar were induced in alfalfa without adding N and P. And the addition of N and P promoted plant growth by reducing the toxicity of Na+ and increasing the ratio of K+/Na+ and Ca2+/Na+. Conclusion: N significantly increased the fresh weight, water production efficiency, and crude protein content of alfalfa, and significantly reduced the accumulation of tetracycline antibiotics in alfalfa. N and P can alleviate the salt stress introduced by wastewater through the change of osmotic adjustment substances. Entropy-TOPSIS analysis showed that the high biomass, water use efficiency and quality was obtained with 120 kg N ha-1 and 80 kg P2O5 ha-1 under wastewater irrigation. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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