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首页> 美国卫生研究院文献>Food Science Nutrition >Optimizing water and phosphorus management to improve hay yield and water‐ and phosphorus‐use efficiency in alfalfa under drip irrigation
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Optimizing water and phosphorus management to improve hay yield and water‐ and phosphorus‐use efficiency in alfalfa under drip irrigation

机译：优化水和磷管理提高滴灌条件下苜蓿的干草产量以及水和磷的利用效率

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Alfalfa ( L.) is an important forage legume in arid areas, but limited water resources and low fertilizer utilization have restricted its agricultural development. Meanwhile, studies on the effects of integrated water and phosphorus on production performance and water‐use efficiency and phosphorus‐use efficiency of alfalfa, especially on hay yield, phosphorus accumulation, and total phosphorus uptake are rarely reported under drip irrigation. The treatments were a factorial combination of three irrigation rates (5,250, 6,000, and 6,750 m /ha per year) and four P rates (0, 50, 100, and 150 kg/ha per year) and consisted of 12 treatments for water and P management, arranged in a randomized complete block design with three replicates. Total hay yield and water‐use efficiency and phosphorus‐use efficiency of alfalfa in P treatment were significantly greater than those in the P and P treatments (  0) treatment under the same irrigation amount. The total phosphorus and available phosphorus concentrations in the 0–20 cm soil layer were greater than those in the 20–40 cm and 40–60 cm soil layers compared with those in the P treatment. Correlation analyses showed that total hay yield was significantly positively correlated with total phosphorus uptake and water‐use efficiency (  p p 2P  > W P  > W P . Therefore, an irrigation rate of 6,000 m /ha and a phosphorus application rate of 100 kg/ha per year should be considered as the best management for both high yield and water‐use efficiency and phosphorus‐use efficiency of alfalfa.
机译：苜蓿（L.）是干旱地区重要的牧草豆类，但是水资源有限和化肥利用率低限制了其农业发展。同时，关于滴灌条件下水和磷对苜蓿生产性能，水分利用效率和磷利用效率的影响，特别是对干草产量，磷积累和总磷吸收的影响的研究很少。这些处理方法是三种灌溉速率（每年5,250、6,000和6,750 m / ha）和四个P速率（每年0、50、100和150 kg / ha）的因子组合，包括12种水和水处理方法。 P管理，以三个重复的随机完整块设计进行安排。在相同的灌溉量下，磷处理的紫花苜蓿的总干草产量，水分利用效率和磷利用效率显着高于磷和磷处理（0）处理。与P处理相比，0–20 cm土壤层中的总磷和有效磷浓度高于20–40 cm和40–60 cm土壤层中的总磷和有效磷浓度。相关分析表明，干草总产量与总磷吸收量和水分利用效率显着正相关（p p 2P> WP> WP。因此，灌溉速率为6,000 m / ha和磷施用量为100 kg / ha每对于紫花苜蓿的高产，高用水效率和高磷利用效率，应将一年作为最佳管理方法。

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