８０年代以来，我国大量试验证明，化学钾肥作基肥或早期追肥，能够满足水稻全生育期对钾的营养需求而获得高产。但国内外也有不少资料报道，水稻分蘖期钾临界值不高，需钾量不大，而孕穗期钾需求量很大，钾肥应以中期为重点分次施用效果更好。显然，水稻施钾技术上存在着... Since the 1980s, a large number of experiments in our country have proved that using chemical potash as basal fertilizer or early top dressing can meet the demand for potassium nutrition during the whole growth period of rice and achieve high yield. However, there are a lot of data both at home and abroad reported that the critical value of potassium in tillering stage of rice is not high, the amount of potassium required is small, but the demand of potassium in booting stage is very large, and the application of potassium fertilizer should be given priority in the medium term. Obviously, the technology of rice potassium exists ...