石灰性土壤水稻喷施锰镁肥具有显著的增产效果 ,平均每公顷增产稻谷 80 3kg ,增产9.0 %。叶面喷施锰镁肥能增加水稻成穗数 ,提高结实率和千粒重。在土壤有效态锰、镁含量较低的情况下 ,1%MnSO4 喷施效果优于 0 .4%MnSO4 ,4%MgSO4 喷施效果优于 2 %MgSO4 Calcareous manganese and magnesium fertilizers were sprayed on calcareous soils with a significant yield increase, with an average of 80 3 kg per hectare and an increase of 9.0%. Foliar application of manganese and magnesium fertilizer can increase the number of spikes in rice, improve seed setting and grain weight. In the condition that the contents of available manganese and magnesium in soils are lower, the spraying effect of 1% MnSO4 is better than that of 04% MnSO4 and the spraying effect of 4% MgSO4 is better than that of 2% MgSO4