目前,在追肥问题上存在二个偏向:一是不论土壤性质如何,一律施用含氮量高的化肥:二是不管作物种类及生育期如何,追肥时期和追肥数量固定不变。结果是,肥没少追、钱没少花、工没少搭,而经济效益却很低。许多高产农户的实践证明,只有因土因作物追肥,才能提高化肥利用率,发挥化肥的增产作用。 At present, there are two biases in the top dressing: First, high-nitrogen fertilizers are applied irrespective of the nature of the soil. Second, regardless of crop type and growth period, the top dressing period and the top dressing quantity are fixed. The result is that there is no less chasing fertilizer, less money spent, less workers taking, and low economic benefits. The practice of many high-yielding peasants has proved that only by topsoil-topdressing can we increase the utilization of chemical fertilizers and increase the yield of fertilizers.