Effects of combined nitrogen and phosphorus application on soil phosphorus fractions in alfalfa (Medicago sativa L.) production in China

作者：Kaixin Yang, Shengyi Li, Yanliang Sun, Andrew D. Cartmill, Ignacio F. López, Chunhui Ma, Qianbing Zhang · 发表于：Frontiers in Plant Science · 年份：2024 · DOI：10.3389/fpls.2024.1380738 · 被引用次数：8 · 研究领域：Soil Carbon and Nitrogen Dynamics、Soil and Water Nutrient Dynamics、Plant nutrient uptake and metabolism

Nitrogen (N) and phosphorus (P) fertilizers change the morphological structure and effectiveness of P in the soil, which in turn affects crop growth, yield, and quality. However, the effects and mechanism of combined N and P application on the content of P fractions and the transformation of effective forms in alfalfa ( Medicago sativa L.) production is unclear. This experiment was conducted with four levels of N: 0 (N 0 ), 60 (N 1 ), 120 (N 2 ) and 180 kg·ha -1 (N 3 ); and two levels of P (P 2 O 5 ): 0 (P 0 ) and 100 kg·ha -1 (P 1 ). The results indicated that, under the same N level, P application significantly increased soil total N, and total P, available P, and content of various forms of inorganic P when compared to no P application, while decreasing the content of various forms of organic P and pH value. In general, under P 0 conditions, soil total N content tended to increase with increasing N application, while total P, available P content, pH, inorganic P content in all forms, and organic P content in all forms showed a decreasing trend. When compared to no N application, insoluble P (Fe-P, O-P, Ca 10 -P) of the N application treatments was reduced 2.80 - 22.72, 2.96 - 20.42, and 5.54 - 20.11%, respectively. Under P 1 conditions, soil total N and O-P tended to increase with increasing N application, while, pH, Ca 2 -P, Al-P, Fe-P, Ca 10 -P, and organic P content of each form tended to decrease. Total P, available P, and labile organic P (LOP) of N application reduce...