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答:把刨垵追氮肥后覆土踩一脚与播种踩格混同对待是不合适的。前者的为了保肥,后者是为了反润。有人以除一脚后的土表返白盐为根据,就此否定踩一脚。这种返白盐现象,叮能造成肥分损失,但深施松覆土(不踩紧)所引起的肥分气态损失,它不留任何痕迹,而损失量是很大的。人们对碳酸氢铵、尿素或石灰性土壤上施用硫铵、氯铵所造成的气态氮(NH_3)挥发散失往往是忽视的。
A: It is not suitable to treat the planed furrow top-dressing with trenching and sowing the same with sowing. The former in order to keep fat, the latter is to anti-run. Some people with the exception of one foot after the table returned to white salt as the basis, in this regard denied foot. This return to salt phenomenon, can cause the loss of fat, but deep Shusong soil (not stepped on) caused by gas loss of fat, it does not leave any traces, but the loss is great. The volatilization of gaseous nitrogen (NH 3) caused by the application of ammonium and ammonium chloride on ammonium bicarbonate, urea or calcareous soil is often neglected.