水稻单位面积产量决定于单位面积上的穗数、每穗实粒数和粒重的乘积.这三个因素中任何一个因素的变化都能影响产量的增减.三者关系的协调是水稻育种和生产上的重大问题,早就为农业研究人员所关注.解放以来,我国水稻产量的增长,也与以上三个因素的相应提高有密切关系.回顾30年来浙江省水稻品种的变化,大致可分三个阶段:解放初期,生产上所用的水稻品种多系长期栽培的天花落等古老的农 Rice yield per unit area is determined by the number of spikes per unit area, the number of grain per panicle and grain weight of the product of any one of these three factors can affect the change of yield changes.The coordination of the relationship between the three is rice breeding And major problems in production have long been of concern to agricultural researchers. Since the liberation, the growth of rice production in our country has also been closely linked with the corresponding improvement of the above three factors. Looking back on the changes of rice varieties in Zhejiang Province in the past 30 years, Divided into three stages: the liberation of the early years, the production of rice varieties used in long-term cultivation of many ancient flowers and other plants