论文部分内容阅读
解放以来,北京地区小麦品种经历了三次大规模的更换,对小麦单位面积产量的提高起了很大的促进作用,由解放初期亩产几十斤提高到七十年代的四百多斤。自五十年代后期开始推广杂交育成的抗条锈良种以来,基本上控制了条锈病的危害。但随着生产条件的逐步改善。耕作制度和栽培技术水平的不断提高。对小麦品种提出越来越高的要求。自七十年代以来叶锈病的危害有所发展。如1969年叶锈病危害较大,小麦减产10～20%,1973、1975及
Since the liberation, the wheat varieties in Beijing have undergone three large-scale changes, which have greatly promoted the yield per unit area of wheat, from several kilos per mu in the early period of liberation to 400 kilos in the seventies. Since the late 1950s, hybrid breeding bred anti-stripe rust cultivars have been basically controlled the harm of stripe rust. However, with the gradual improvement of production conditions. Farming systems and cultivation techniques continue to improve. Increasingly higher requirements for wheat varieties. The risk of leaf rust has developed since the 1970s. Such as 1969 leaf rust greater harm, wheat yield 10 to 20%, 1973,1975 and