中国草地学报2025，Vol.47Issue(11)：38-48,11.DOI:10.16742/j.zgcdxb.20240458
施磷肥对退化苜蓿草地生产性能及磷利用效率的影响
Effects of Phosphorus Fertilization on Production Performance and Phosphorus Use Efficiency in Degraded Alfalfa Grassland
摘要
Abstract
In order to improve the forage yield and quality of degraded alfalfa grassland in the semi-arid region of Ningxia,this study was conducted using a single-factor randomized block design to investigate the effects of different diammonium phosphate(DAP)application rates(0,75,150,and 225 kg/hm2)on the pro-duction performance and forage quality of alfalfa.The results showed that application of DAP significantly increased alfalfa plant height,branch number,and hay yield,while decreasing neutral and acid detergent fiber contents.Among these treatments,150 kg/hm2 fertilization treatment yielded the highest two-year average plant height(79.05 cm),hay yield(9774.50 kg/hm2),crude protein yield(2005.31 kg/hm2),stem phospho-rus content(0.20%),leaf phosphorus content(0.24%),and phosphorus uptake content(21.57 kg/hm2).75 kg/hm2 treatment recorded the highest phosphorus use efficiency(PUE),with a mean PUE of 8.70%across both years.Structural equation model(SEM)revealed highly significant(P<0.001)direct positive effects of plant height on phosphorus content,branch number on hay yield,and hay yield on phosphorus uptake content.The fitted equations predicted that the maximum yield potential of alfalfa was 9789.59 kg/hm2 for hay yield and 2005.56 kg/hm2 for crude protein when average DAP application rates were 149.54 kg/hm2 and 148.55 kg/hm2 over the two years.Therefore,the optimum DAP application rate for degraded alfalfa grassland in the semi-arid areas of Ningxia was 150 kg/hm2.关键词
磷肥/退化苜蓿草地/生产性能/营养品质/肥料利用效率Key words
Phosphorus fertilizer/Degraded alfalfa grassland/Production performance/Nutritional quality/Fertilizer use efficiency分类
农业科技引用本文复制引用
尤炜,王斌,王腾飞,张译尹,高薇薇,兰剑..施磷肥对退化苜蓿草地生产性能及磷利用效率的影响[J].中国草地学报,2025,47(11):38-48,11.基金项目
宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01) （草学学科）
半干旱区退化草地恢复关键技术和利用模式研究与示范项目(2022BEG02011) （2022BEG02011）
"一年两熟"人工草地可持续发展模式研究与示范项目(2021BBF02001) （2021BBF02001）
