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在正常供钾(营养液含 K235ppm)条件下。油菜苗期叶面喷施300ppm 混合硝酸稀土,0—32天内促进根系对钾的吸收及向地上部转运。稀土元素对此起主导作用。NO_3~-的作用也不可忽略。在轻度缺钾(营养液含 K117.5ppm)和严重缺钾(营养液含 K70.5ppm)条件下喷施300ppm 混合硝酸稀土,分别在0—43天和0—32.5天内促进钾素从根部向地上部转运,改善地上部缺钾状况,但不能解决地下部缺钾现象。试验表明,在不同的钾素水平下,硝酸稀土对油莱吸收及转运钾的影响有所不同,其作用持续时间亦也不相同。结果还表明,混合稀土元素不能完全代替钾元素。
In normal potassium (nutrient solution containing K235ppm) conditions. Rapeseed foliar spraying 300ppm rare earth nitrate, 0-32 days to promote root absorption of potassium and translocation to the shoot. Rare earth elements play a leading role. The role of NO_3 ~ - can not be ignored. Spraying 300ppm mixed rare earth nitrate under mild potassium deficiency (nutrient solution containing K117.5ppm) and severe potassium deficiency (nutrient solution containing K70.5ppm), promoted the recovery of potassium from the roots at 0-43 days and 0-32.5 days Translocation to the aboveground, to improve the aboveground potassium deficiency, but can not solve the underground potassium deficiency phenomenon. The results showed that under different K levels, rare earth nitrate had different effects on the absorption and transport of potassium by oil Lai, and the duration of action was different. The results also show that mixed rare earth elements can not completely replace potassium.