贵州牧地钾素与白三叶钾素营养状况研究

ANALYSIS ON K CONTENT IN GRASSLAND SOIL AND K NUTRIENT STATE OF WHITE CLOVER IN GUIZHOU

在两种施磷水平下,对不同比例钾肥进行田间试验,结果表明:土壤与植物中钾、钙、镁间存在相互效应,钾钙镁营养水平均显著地影响白三叶生长高度,当牲地中K/(Ca+Mg)接近0.024时,白三叶反映能较好吸收土壤中钾,没有产生钾与钙+镁之间的拮抗作用。低钾水平时,低量的钙+镁能促进白三叶钾的吸收,而高钙+镁时则抑制钾的吸收,不同的施磷量也对植物中K/(Ca+Mg)比有影响。

Field experiments of different ratio K were conducted under high P and low P conditions.The nutrient levels of K-Ca-Mg affected significantly growth height of white clover. There are relationship of cation (K, Ca, Mg) between soils and plants. When the cationic ratio K/(Ca + Mg), in grassland equals 0.024,the K uptake of white clover from soils increased and there aren't antagonistic reactions among the major cation (K, Ca and Mg) in plants. In low K level,low valence Ca + Mg can increase K uptake in white clover and high valence of Ca + Mg suppressed K uptake in white clover. The cationic ratio, K/(Ca + Mg), in plants was changed by applying different ratio P.