文档介绍：川中丘陵区玉米品种茎秆特性及其抗倒伏能力研究??: ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? SAU1210 , ??????? 171 ????????????????????????? Maize varieties stalk lodging resistance characteristics and study ina hilly area Agronomy Liu ang Teacher : Kong Fanlei Abstract: Corn lodging isone of the important reasons for the large scale production of corn. Lodging capacity of different species of great significance for reducing corn production . Inour study, 15 different varieties of spring maize in Sichuan . Measurement of different varieties of corn in different sections of elongated internodes length, stem diameter, resistance to puncture force, crush strength . Analysis of corn stalk lodging resistance characteristics and various varieties. Screened stem features excellent lodging with a strong ability breed .1 前言近年来,我国玉米种植面积不断增大,产量不断提高,总产量第一位。目前, 玉米已成为食用、饲用、工业用、医用和能源等领域的主要原料。人口增加、能源和加工业、养殖业的快速发展,将大量消耗玉米。面对市场需求量猛增,人增地减等生产环境的多重压力,保证玉米的高产稳产具有重要的意义。近年来由于栽培密度提高、极端气候条件的增多等问题,倒伏问题尤为突出。根据近几年的研究,玉米倒伏均会造成不同程度的减产,轻的减产 5%~10% ,重的减产 30%~50% ,甚至绝产。玉米倒伏是由外界因素引发的农作物茎杆从自然直立状态到永久错位的现象。在玉米灌浆期时玉米雌穗重量迅速增长,且灌浆期倒伏对产量影响最大,减产最严重。相对于水稻、小麦的抗倒伏研究,我国对玉米抗倒伏的研究相对较少。近年来我国对玉米抗倒伏的研究逐渐增多。主要包括对玉米倒伏的原因、预防措施以及补救方法都有了深入研究。因为北方多大风天气,所以国内对玉米抗倒伏的研究以北方玉米居多,南方玉米相对较少。西南玉米区是我国三大玉米主产区之一,分别占全国玉米总面积、总产量的 30% 左右。川中丘陵阴雨天较多,太阳