据调查:近年来有相当一部分农户在种植特色玉米时,因为种植方法不当,而使其失去了原有品种的特征特性,造成品质下降,如黑玉米不黑、变成花粒;有的甜粘玉米虽然在外表上无明显变化,但甜度下降,粘度降低。造成上述现象的一个重要原因是由于种植地块隔离不严,使这些玉米品种在雌穗吐丝期接受了外来一般玉米花粉,导致品种发生变化,使商品性下降而影响收入。 According to the survey: In recent years, a considerable number of farmers in the cultivation of characteristic corn, because of improper planting methods, which make it lose the characteristics of the original varieties, resulting in declining quality, such as black corn is not black, into flowers; some sweet Sticky corn, although no apparent change in appearance, but the sweetness decreased viscosity decreased. An important reason for the above phenomenon is that due to the lack of strict isolation of cultivated land, these maize varieties have received foreign maize pollen during the spawning period, resulting in the change of variety and the decrease of commerciality, which will affect the income.