一、钾肥对缺钾水稻的增产效果钾肥在稻田施用的增产效果,一般在有机肥少,土瘦,偏氮,缺钾稻田加上不良气候(如高、低温)条件下施用,增产比较显著,在发现缺钾症状(如褐斑、黄化等)的稻田施用,效果更加显著。因此,在当前钾源不足情况下,应把少量钾肥,优先用于此类稻田。演丰公社地处海南岛的北部,大部分土壤是玄武岩发育成的红壤土。这类土壤,据1978年抽样30个速测有效钾的结果,属于“缺乏”及“很缺乏”程度(100ppm以下)25个,占83.3％,中等程度(100—150ppm)5个,占16.6％。我们从1973—1979年在我社11个大队 First, the potassium yield of potassium-deficient rice The yield-increasing effect of potash fertilizer application in paddy fields, generally in the organic fertilizer less, thin, thin nitrogen, potassium deficit paddy plus adverse climate conditions (such as high and low temperature) application, the yield was more significant , Found in potassium deficiency symptoms (such as brown spots, yellowing, etc.) of rice fields, the effect is more pronounced. Therefore, a small amount of potash fertilizer should be used preferentially for such paddy fields, given the current shortage of potassium sources. Yan Feng commune is located in the northern part of Hainan Island, most of the soil is developed into basalt red soil. According to the results of 1978 rapid sampling of 30 available potassium, 25 of these soils are “deficient” and “very deficient” (less than 100ppm), accounting for 83.3%, and moderately (100-150ppm), accounting for 16.6 %. We have 11 battalions in our society from 1973-1979