不同年代大豆品种农艺性状的比较研究

he experiment was made on comparison of main agronomic traits of soybean cultivars in different ages. The results showed that pods of main stem, pods per plant, seeds per plant, seed weight per plant, 100-seed weight, seed/stem ratio, pods with 3,4 seeds increased greatly through many years of genetic improvement. Meanwhile, plant height, pods of branches, internode length decreased. Comparison of these characteristics among modern cultivars, it was found that cultivars of America had more pods per plant, seeds per plant, seed/stem ratio than that of China, while Chinese cultivars had larger 100-seed weight. The results also revealed that fertilizer level had an obvious effect on main yield characters. Under high fertilizer level cultivars of America achieved the highest yield among all the tested cultivars.