粤北坡岗地木薯主产区土壤有效氮、磷、钾丰缺指标研究  

Study on abundance and deficiency indices of soil available N,P and K for cassava in sloping soil of Northern Guangdong

作　　者：高志红[1] 陈晓远[1] 林昌华[1] 

机构地区：[1]韶关学院英东农业科学与工程学院,广东韶关512005

出　　处：《广东农业科学》2012年第13期63-65,共3页Guangdong Agricultural Sciences

基　　金：韶关市创新资金科技计划项目(2010CX/N06);国家"十一五"科技支撑计划项目(2008BADA4B10-09)

摘　　要：在粤北翁源、乳源、浈江等地开展坡岗地木薯"3414"肥效试验,按照Cate-Nelson方法,根据缺素处理(-N、-P、-K)占全肥处理(NPK)的相对产量数据与土壤有效养分测定值之间的关系,建立对数拟合方程,以相对产量<50%、50%～75%、75%～90%、90%～95%和>95%为标准,研究土壤有效氮、磷、钾供应的丰缺临界指标。结果表明,粤北坡岗地木薯产区土壤碱解氮缺乏临界值为66.2 mg/kg,高产临界值为70.5 mg/kg,缺乏土样占测试土样的70%;土壤有效磷缺乏临界值为11.3 mg/kg,高产临界值为14.1 mg/kg,缺乏土样占测试土样的80%;土壤有效钾缺乏临界值为61.0 mg/kg,高产临界值为71.3 mg/kg,缺乏土样占测试土样的70%。研究结果可为粤北坡岗地高效施肥提供理论依据。The cassava fertilizer application effect ＂3414＂ field trials were made in sloping soil of Wengyun, Ruyuan, Zhenjiang, Northern Guangdong. The logarithm simulating equation was established according to Care-Nelson method,based on the relationship between the relative yields of the no N, P, K fertilizer treatments to the recommended N, P, K fertilization amount treatments and the soil available nitrogen, phosphorus and potassium. The abundance and deficiency indices of soil available nitrogen, phosphorus and potassium were studied ,in term of relative yield at less than 50%, 50%-75%, 75%-90%, 90%-95% and more than 95% level. The results obtained were as follows： the soil critical available nitrogen indices of deficiency and high yields were 66.2 mg/kg and 70.5 mg/kg respectively, the pencent of N deficiency soil accounted to total surveyed soil samples was 70%. The soil critical available phosphorus indices of deficiency and high yields were 11.3 mg/kg and 14.1 mg/kg, the pencent of P deficiency soil accounted to total surveyed soil samples was 80%. The soil critical available potassium indices of deficiency and high yields were 61.0 mg/kg and 71.3 mg/kg, the pencent of K deficiency soil accounted to total surveyed soil samples was 70%. The present study could offered foundation for high effect fertilization in Sloping lands of North Guangdong.

关 键 词：坡岗地 木薯 土壤有效氮 土壤有效磷 土壤有效钾 丰缺指标 

分 类 号：S533[农业科学—作物学] S158