Optimizing the nutritional quality and phosphorus use efficiency of alfalfa under drip irrigation with nitrogen and phosphorus fertilization,Agronomy Journal

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Optimizing the nutritional quality and phosphorus use efficiency of alfalfa under drip irrigation with nitrogen and phosphorus fertilization
Agronomy Journal ( IF 2.0 ) Pub Date : 2020-05-29 , DOI: 10.1002/agj2.20267
Qianbing Zhang ₁ , Junying Liu ₁ , Xuanshuai Liu ₁ , Yanliang Sun ₁ , Shengyi Li ₁ , Weihua Lu ₁ , Chunhui Ma ₁

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Appropriate fertilization is an important management practice for optimizing the nutritional quality and increasing the phosphorus use efficiency (PUE) of field‐grown alfalfa (Medicago sativa L.). A 2‐yr field experiment in 2017 and 2018 in Xinjiang, China, involving fertilization with different amounts of N (0, 105, and 210 kg ha⁻¹, referred to as N₀, N₁, and N₂, respectively) and P (0, 50, 100, and 150 kg ha⁻¹, referred to as P₀, P₁, P₂, and P₃, respectively) was established and resulted in the production of high‐quality alfalfa under drip irrigation. The crude protein (CP) content in the N₁ treatment was greater than that in the N₂ treatment under the P₀, P₂, and P₃ treatments. Compared with that in the N₁P₀ and N₂P₃ treatments, the relative feed value (RFV) in the N₁P₂ treatment increased by 9−21% and 8−18%, respectively. The annual total CP yield in the N₁P₂ treatment was the greatest. Compared with that in the N₁P₃ treatment, the total PUE in the N₁P₂ treatment increased by 76.69−99.69%. At each clipping, the CP yield and PUE of alfalfa were significantly different between the N and P treatments. Therefore, we conclude that when N was applied at 105 kg ha⁻¹ and P was applied at 100 kg ha⁻¹, alfalfa presented the greatest nutritional quality and PUE under drip irrigation.

更新日期：2020-05-29

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