水旱轮作下的土壤锰素与锰肥的应用

在水旱轮作条件下,土壤锰在植稻期间被大量还原为Mn~(21),从耕层淋失,因而冲积性水稻土全锰和有效锰低于其起源土壤(冲积土)。水旱轮作与土壤缺锰相关,但缺锰土壤必须同时具备石来性、轻质和水旱轮作的三个特征。小麦、大麦、厚皮菜、蚕豆、烟草、莴苣等对锰敏感,施锰有良好效果。缺锰土壤有效钾也较低,钾锰肥配施对小麦产量表现为正效应。

SOIL MANGANESE IN RICE-WHEAT ROTATION AND THE APPLICATION OF MANGANESE FERTILIZER

The soil Mn is reduced into Mn~(2+) in a great amount and then lenched from top-soil during rice planting in ricewheat rotation. So,the total Mn and available Mn in the alluvial paddy soil were lower than that in the original soil(alluvial soil). Under the conditions of calcareous soil, coarse texture as well as rice-wheat rotation will cause Mn-deficienty in soil. The wheat,barley, cabbage, broad bean,tobacco and lettuce are sensithive to Mn deficiency and the application of Mn fertilizer can increase crop yield significantly. The content of available potassium in Mn deficient soil is also quite low,the application of K and Mn combined fertilizer will have significant effect in incrasing the yield of wheat.