低钾青紫泥田种稻配钠减钾施肥试验

Application of partly substitution of potassium by sodium to rice in the paddy soil of blue purple clay and low potassium

低钾青紫泥田(土壤速效钾<80 ppm)种植水稻,当季亩施有机肥500 kg以上时,全部钾肥(KCl)可用钠盐(NaCl)代替.无有机肥施用的稻田可用钠盐代替钾肥的一半。另外,钠盐与钾肥相似,可提高氮肥产谷率10％以上,相当于增施1/3的氮化肥量,达到促氮节氮之目的。

In the paddy soil of blue purple clay and low potassium (Available K<80ppm), the potassium which is necessary to high yield of rice could be substituted by sodium when more than 500 kg manure per mu was supplied, and half of the usual dose of potassium could be substitued by sodium when no manure was supplied without a decline in yield. The results showed that the same available amount of potassium fertilizer can be applied to more than double area fields. Therefore it can alleviate the short of potassium fertilizer. In addition, the produce of rice per unit nitrogen can be increased, similar to potassium, above 10 percent. Thus, the used nitrogen fertilizer is more efficiency.