【作者】 邹娟； 鲁剑巍； 陈防； 廖志文； 李银水；

【Author】 ZOU Juan~1,LU Jianwei~1,Chert Fang~(2,3),LIAO Zhiwen~1,LI Yinshui~1 (1 College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070) (2 Botanical Garden of Wuhan/Wuhan Institute of Botany,Chinese Academy of Sciences,Wuhan 430074) (3 Wuhan Office of the International Plant Nutrition Institute(IPNI),Wuhan 430074)

【机构】 华中农业大学资源与环境学院； 中国科学院武汉植物园；

【摘要】 2000/2001年及2004/2005～2006/2007年共4个年度在长江流域冬油菜产区的10个省（市）进行油菜钾肥田间试验132个,研究当前生产条件下钾肥的施用效果和土壤速效钾的丰缺指标。结果表明,施钾油菜籽平均增产率18.0%,增产量358 kg·hm^-2;施钾和不施钾处理钾素（K₂O）效率分别为14.7 kg·kg^-1和18.1 kg·kg^-1, 每生产100 kg 籽粒需吸收 K₂O 7.4 kg.钾肥当季利用率为39.3%。土壤速效钾含量与施钾增产量呈极显著负相关;土壤钾素临界值比二十年前确立的临界值有所提高,按照不施钾产量占施钾产量的90%为标准,长江流域冬油菜土壤速效钾临界值分别为135 mg·kg^-1。更多还原

【Abstract】 To study on response of rapeseed to potassium application and critical level of soil available K in the region of Yangtze River Valley.132 field experiments were conducted in farmers’ fields in the major winter rapeseed—growing areas of China in 2000/2001 and 2004/2005—2008/2007 growth season.Results of field experiments showed that,the average increment with K fertilization was 358 kg hm^-1and the in- creasing rate was 18.0% in 2005/2006 and 2006/2007.Across all sites,the average internal use efficiency （IE）of K was higher in CK treatments(18.1 kg grain kg^-1K₂O uptake)than in+K treatments(14.7 kg grain kg^-1K₂O uptake).The amount of K₂O required by rapeseed for producing every 100 kg seeds was 7. 4 kg.The recovery efficiency of K fertilizer in rapeseed production averaged 39.3%,and the range was from 10.7% to 73.6%.The results indicated that the yield increment by K application had significantly negative relationship with soil available K content.Based on the relative yield of CK/+K at 90 percent lev- el,the soil critical available K was 135 rag kg^-1which was higher than that in the 1980s.更多还原