玉米生产田中的自交苗的危害与防治一、危害１．影响春播抓全苗。产生自交苗主要是种子中有自交系籽粒所为。由于自交系生长势弱，种子顶土能力差，对低温和不良环境的适应性差，是造成缺苗断条的主要因素，所以影响春播抓全苗。２．田间长势有差异。自交系与单交种比。自... Harms and Prevention of Self-Crossing Seedlings in Corn Production Field I. Harm 1. Affect the spring planting grasp the whole seedlings. Selfing seedlings are produced mainly from seed in inbred lines. Due to the weak growth potential of inbreds, the top soil ability is poor, poor adaptability to low temperature and poor environment, is the main factor causing lack of seedlings broken, so the impact of sowing the whole plant seedlings. 2. There are differences in field growth. Inbred lines and single cross-breeding ratio. from...