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近年来,我地部分土壤中的大豆叶黄、花少、籽粒不饱满;豌豆落花严重,荚果少;小麦叶片淡黄,秕粒多;油菜生长不良,萎缩不实,单产难以提高。这是什么原因呢?经作物营养诊断和施钼试验,是由于作物体内缺钼所引起,但经土肥化验分析,多数情况不是土壤中钼的含量少,而是pH值偏低,土壤酸性过强,有效钼数最不足。土壤中有效钼以水溶性或代换性钼为主,其大部分以钼酸根(MoO_4)的形态进入土壤溶液。但在酸性土壤中,铝酸根易同土壤中游离的铁和铝离子结合生成难溶性的钼酸铁[Fe_2
In recent years, some of my soil soybean leaves yellow, flowers less, the grain is not full; peas serious drop of flowers, pods less; wheat leaves yellow, nodules and more; rape bad growth, atrophy is not, the yield is difficult to increase. What is the reason? The crop nutrition diagnosis and the molybdenum test are caused by the lack of molybdenum in the crop, but the analysis of the soil fertility test shows that in most cases, the content of molybdenum in the soil is low, but the pH value is low and the soil acidity is too low Strong, effective molybdenum the most inadequate. The available molybdenum in the soil is mainly water-soluble or substitutional molybdenum, most of which enter the soil solution in the form of molybdate (MoO 4). However, in acid soils, aluminate tends to combine with free iron and aluminum ions in the soil to form insoluble iron molybdate [Fe 2