摘要
通过22个田间试验研究湖北省油菜主产区钾肥效应和适宜用量。结果表明，适量施用钾肥对油菜具有明显的增产增收效果，21个试验施钾比不施钾对照增收油菜籽70—1091kg／hm^2，平均增产337kg／hm^2，增产幅度在2．5％～68．6％之间，平均增产率为18．6％；纯利润平均为871元/hm^2，产投比平均达3．91；钾肥偏生产力和农学利用率平均分别为34．8kg/kg K2O和4．2kg／kg K2O。根据肥料效应方程，在当前生产条件下，油菜生产的钾肥最佳经济用量平均为82．7kg K2O／hm^2，推荐幅度为0—150．2kg K2O／hm^2。土壤速效钾含量与油菜钾肥最佳推荐用量呈极显著负相关（r=-0．7896^＊＊，n=20），根据土壤速效钾含量（x，单位为mg／kg）水平，湖北省目前油菜生产适宜用钾量（Y，单位为kg／hm^2）可通过公式Y=366．28—62．646Ln（x）求得。
22 field trials were carried out to study the response to potassium （K） and find out optimized K rates for rapeseed in Hubei province. The results showed that K application both significantly increased rapeseed yield and profit. The increased yield ranged from 70 kg/hm^2 to 1 091kg/hm^2 with an average of 337kg/hm^2, and the increment ranged from 2.5% to 68.6% with an average of 18.6%. The average net profit of K application was 871Yuan/hm^2 and the value cost ratio （VCtt） was 3.91. The average partial factor productivity of applied K （PFPK） and agronomic K use efficiency （AKUE） were 34.8kg/kg K2O and 4.2kg/kg K2O, respectively. According to fertilizer response equations ,the economical K application rates were 0kg/hm^2 to 150.2kg/hm^2, the average rates was 82.7kg/hm^2, It was showed that the economical K application rates had significant negative correlation with soil available K level, the correlation coefficient （r） was 0.789 6 （ n = 20）. The economical K application rates of rapeseed can be obtained from equation y = 366.28 -62. 646Ln（x） （y stands for applied rate of K2O ,x stands for soil available K content） in Hubei Province.
出处
《中国油料作物学报》
CAS
CSCD
北大核心
2008年第4期469-475,共7页
Chinese Journal of Oil Crop Sciences
基金
教育部“新世纪优秀人才支持计划”
国家十一五科技支撑课题(2006BAD21B03、2006BAD25B01)
国际植物营养研究所(IPNI)合作项目(Hubei-30)
农业部948重大项目(2006-G60)
关键词
油菜
钾肥
产量
经济效益
钾肥推荐用量
Rapeseed （Brassica napus L. ）
Potassium （K）
Yield
Profit
Optimized K recommendation rates
作者简介
李银水（1979-），女，白族，云南大理人，硕士研究生，主要研究方向为现代施肥技术。E-mail：lysh@webmail．hzau．edu．cn.
通讯作者：E-mail：lujianwei@mail．hzau．edu．cn
