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通过多点田间试验研究红壤性水田油菜供肥特性和钾肥施用量 .1 8个田间试验施钾油菜籽增产幅度为 7.5～ 90 .8kg/亩 ,无钾区相对产量变幅为 48.2～ 93.1 % .1mol/LNH4OAc提取的土壤速效钾含量与无钾区相对产量之间达极显著相关 ,相关系数为 0 .6 44 9 (n =1 8) .土壤速效钾的“临界水平”为80mg/kgK ,能满足 95 %相对产量的“足够水平值”为 1 5 0mg/kgK ,系统研究平衡施肥法中各参数的确定 ,并用平衡施肥法和施肥曲线确定油菜钾肥合理用量 ,两种方法具有可比性
The field experiment was conducted to study the characteristics of fertilizer supply and potassium application rate in rapeseed paddy soil in paddy field.The yield of potassium rapeseed in 8 field trials was 7.5 ~ 90.8 kg / mu, and the relative yield of potassium-free zone was 48.2-93.1% The soil available K content extracted by 1 mol / L NH4OAc had a significant correlation with the relative yield of potassium-free zone, with a correlation coefficient of 0.649 9 (n = 18). The “critical level” of soil available K was 80 mg / kgK , Which can meet the relative level of 95% of the “adequate level” of 150mg / kgK, the balance of fertilization method to determine the parameters of the system, and balanced fertilization and fertilization curve to determine the rational use of rape potash, the two methods are comparable