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由于成土母质和气候条件的作用,北方大多数农田土壤钾素含量丰富,钾的有效性较高.只有在少数砂质土壤和泥炭土壤上,农作物才表现出缺钾症状,施用钾肥有明显的增产作用.大多数的农田施钾肥效果不显著,二元二次肥料效应回归方程中钾的一次项值极小或为负值,二次项往往为正值.一些速效钾低的土壤,农作物生长前期表现有缺钾症状,而后期则恢复正常;另一些则表现出与上完全相反的情况.说明速效钾不能充分表达土壤钾素的肥力水平.谢建昌(1982)全面研究了南方农田土壤钾素有效性后,提出用缓效钾作为土壤钾素肥力的诊断指标.与速效钾相比,似乎更能
Due to the effects of soil parent material and climatic conditions, most of farmlands in north China have rich potassium and high availability of potassium, and the crops show potassium deficiency only in a few sandy and peat soils, with obvious potassium Increase production.Most of the farmland is not significant effect of application of potassium fertilizer, two binary fertilizer effect regression equation of the primary value of potassium is minimal or negative, quadratic is often positive.And some low available potassium soil, crops Potassium deficiency symptoms appeared in the early growth stage, while those in the later stage returned to normal. Others showed the opposite situation, indicating that potassium could not fully express the fertility level of soil potassium. Xie Jianchang (1982) After effectiveness, it is proposed that slow-acting potassium be used as a diagnostic indicator of soil potassium fertility, which seems to be more effective than rapid-acting potassium