摘要
通过对砂姜黑土区域土壤速效钾的分析及其固钾能力的室内模拟研究，得出砂姜黑土１０年间速效钾下降了４９．１ｍｇ／ｋｇ，其固钾量和固钾率远大于对比土壤潮土。冬小麦田间多点试验表明，施钾增加小麦分蘖、次生根与叶面积系数，最终增加了产量。但并非施钾越多越好，最佳施钾量因地力条件而定，高地力条件为９４．５ｋｇ／ｈｍ２，低地力条件下为１１２．５ｋｇ／ｈｍ２。
The results from analyzing available potassium (K) in Shajiang black soil and K fixation showed that soil available K decreased by 49.1 mg/kg from 1984 to 1994 and the capacity of K fixation in Shajiang black soil was much higher than that of fluvoaquic soil. The results of multisite field trials on winter wheat indicated that the application of K fertilizer increased wheat number of tillering, number of subroot, coefficient of leaf srea and yield in the end. The optimum K rate varied with soil fertility, 94.5 kg/hm2for high soil fertility and 112.5 kg/hm2 for low soil fertility
出处
《干旱地区农业研究》
CSCD
北大核心
1998年第2期65-68,共4页
Agricultural Research in the Arid Areas
基金
国家科技攻关项目
关键词
砂姜黑土
固钾特性
冬小麦
钾肥
Shajiang black soil, K fixation, winter wheat, K fertilizer
