不同因素对棉花增产的贡献率分析

利用国家有关部门对全国棉花良种种植情况的调查数据，应用品种遗传改良对产量贡献作用的分析模型，计算了我国四大棉区五个省（区）棉花品种遗传改良、化肥投入和栽培管理等其他措施在产量提高中的作用。结果表明：我国棉区典型省份棉花品种遗传对产量的贡献作用在１６％～３６％，与化肥投入贡献作用率中值的４０％和管理等的３４％相比是最低的。今后相当一段时期内棉花生产的发展是良种的选育和推广应用

Contribution of Different Factors on Cotton Yield Increases in China

Based on the data of improved planting cotton cultivars throughout thecountrywe calculated the contribution of cultivar improvement, chemical fertilizer inputsand other management measures such as crop husbandry to cotton yield increases in 4cotton producing zones including 5 provinces in China, according to the model of contribution of genetic improvement to cotton yield increases. It is showed that the contribution of genetic improvement to cotton yield increases ranged from 16% to 36%,which isthe lowest with the average contributions of chemical fertilizer inputs (40% ) and othermanagement measures such as crop husbandry (34% ).Breeding and expanding the improved cotton cultivars have played an important role in cotton yield increases in recentyears or for a long time in the future.