Water–phosphorus coupling enhances fine root turnover and dry matter yield of alfalfa under drip irrigation,Agronomy Journal

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Water–phosphorus coupling enhances fine root turnover and dry matter yield of alfalfa under drip irrigation
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-06-29 , DOI: 10.1002/agj2.20782
Xuanshuai Liu ₁ , Junwei Zhao ₁ , Junying Liu ₁ , Weihua Lu ₁ , Chunhui Ma ₁ , Qianbing Zhang ₁

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Alfalfa (Medicago sativa L.)is an important forage with high quality and fine root turnover rate (FRTR). Soil phosphorus (P) availability greatly influences dry matter yield (DMY) and persistence of alfalfa. However, the effects of water (Wa)–P coupling under drip irrigation conditions on alfalfa FRTR and DMY have been rarely studied. Therefore, a 2-yr field experiment was established with three randomized complete blocks in Xinjiang, China, evaluating three irrigation amounts (5,250, 6,000, and 6,750 m³ ha⁻¹, referred to as W₁, W₂, and W₃, respectively) and four P application rates (0, 50, 100, and 150 kg ha⁻¹, referred to as P₀, P₁, P₂, and P₃, respectively) in 2017 and 2018. The Wa–P interaction had a significant effect on alfalfa DMY (P < .05), and DMY reached the maximum at W₂P₂ treatment. Fine root biomass (FRB) presented a bimodal pattern over time (on 21 June and 20 August) and mainly existed in the soil layers 20‒40 cm underground. All root variables including FRB were positively correlated with alfalfa DMY. Comprehensive analysis showed that W₂P₂ was the optimal treatment of the 12 treatments. Therefore, the irrigation amount of 6,000 m³ ha⁻¹ and P application rate of 100 kg ha⁻¹ seems beneficial to achieve the relatively rational FRTR and the greater DMY of alfalfa.

更新日期：2021-06-29

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