种植年限对紫花苜蓿栽培草地草产量及土壤氮、磷、钾含量的影响  

Effect of different planting years on the yield of alfalfa and content of N,P,K in soil

作　　者：邰继承[1] 张丽妍[1] 杨恒山[1] 

机构地区：[1]内蒙古民族大学农学院,内蒙古通辽028042

出　　处：《草业科学》2009年第12期82-86,共5页Pratacultural Science

基　　金：内蒙古自然科学基金项目(20050801036);内蒙古人才开发基金资助项目(2005-12)

摘　　要：采用田间调查取样和室内分析相结合的方法,2007年在内蒙古民族大学农学院试验农场以1年生、2年生、3年生、4年生和6年生紫花苜蓿Medicago sativa地为研究对象,分析了种植年限对紫花苜蓿草产量及土壤氮、磷、钾含量的影响,结果表明：随着种植年限的增加,草产量逐渐降低,以2年生苜蓿最高,且与6年生苜蓿差异达到极显著水平（P〈0.01）;全氮、碱解氮、速效磷含量随种植年限的增加而增加;全磷含量随种植年限呈先增后降的趋势;速效钾、全钾随种植年限增加而降低;各种养分含量在0-40 cm土层内有随深度的增加而下降的趋势,40-50 cm土层土壤养分含量高于30-40 cm土层。The alfalfa growing for 1,2,3,4 and 6 years on experimental farm of Inner Mongolia University for Nationalities were used to study the yield variation and the content of N,P and K in soil.The results showed that the yield decreased along with the growth year and the yield in second year was the highest.The content of total N,available N and P increased along with the growth year.The total P increased at the beginning and then decreased,available K and total K decreased.Nutrient contents within 0 to 40 cm soil layer decreased as the depth increasing.The nutrient contents within 40 to 50cm soil layer were higher than those in 30 to 40 cm layer.

关 键 词：紫花苜蓿 种植年限 草产量 养分 

分 类 号：S541.9[农业科学—作物学]