玉米苗期的田间管理,最主要的一项工作就是要及时定好苗。所谓定苗,就是留哪棵苗、留多少苗的问题,或者说是确定苗的密度的问题。它是决定玉米单产的先决条件。留苗过稀;单穗大,总穗数少,总粒数少,单粒重较重,结果产量较低。留苗过密:单穗小,总穗数多,总粒数多,单粒重较轻,结果产量较低。 Maize seedling field management, the most important job is to set the seedlings in time. The so-called Dingmiao, which leaves which seedlings stay, how many seedlings to stay, or to determine the density of seedlings. It is a prerequisite for determining corn yields. Liao Miao too thin; single spike, less the total number of spikes, fewer total grains, heavy single grain weight, resulting in lower yield. Liao Miao too close: a single small spike, the total number of spikes, the total number of particles, a single grain weight lighter, resulting in lower yields.