小麦的粒重是构成产量的重要因子。在每亩30万穗,平均每穗35粒的情况下,千粒重每增加一克,每亩可增产小麦21斤。我所1955—1976年二十二年试验结果,南大2419千粒重最高为45.5克,最低为21克,相差24.5克。目前我区推广的“7023”、襄麦4号、宜宾1号和鄂麦6号等品种,千粒重低的只有30克,高的可达44克。因此,研究小麦籽粒增重的规律和影响粒重的因素,从而采取趋利避害的措施提高和稳定粒重,对实现小 Grain weight of wheat is an important factor in yield. In the case of 300,000 spikes per acre, 35 grains per spike, the increase of 1000 grains per acre can increase wheat yield by 21 pounds per acre. Our 1955-1976 Twenty-two years of test results, Nanda 2419 1000 grain weight up to 45.5 grams, a minimum of 21 grams, a difference of 24.5 grams. At present, our region to promote the “7023”, Xiang Mai 4, Yibin 1 and Emai 6 and other varieties, grain weight only 30 grams low, high up to 44 grams. Therefore, the study of the law of wheat grain weight and the impact of grain weight factors, so as to take advantage of measures to reduce and stabilize the grain weight to stabilize, to achieve small