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以穗重型水稻品种东农425和穗数型水稻品种东农427为试验材料,通过密度处理构建不同稻作群体,研究寒地粳稻不同稻作群体条件下水稻茎秆各节间长度、株高、穗长、重心高度、各节间茎粗、茎壁厚度、节间基部到穗顶的长度和鲜重的变化及对茎秆基部第1、2、3(N1、N2、N3)节间的抗折力、弯曲力矩和倒伏指数的影响。结果表明:随着插秧密度的增加,水稻的株高增加,重心高度上移,穗长变短,茎粗变细,茎壁厚度变薄;倒伏指数与茎秆第1,2伸长节间长度呈极显著正相关,与基部茎秆粗度、茎壁厚度呈极显著负相关。通过减少第1和第2伸长节间长度,适当增加茎秆粗度、厚度,降低重心高度,增加穗长,可以提高水稻植株的抗倒性。抗倒伏能力品种间存在差异,穗数型水稻品种东农427的抗倒伏能力强于穗重型水稻品种东农425。
In this study, the rice varieties Dongoneng 425 and Pan-Nong 427 were used as materials to construct different rice groups by density treatment. The effects of different paddy populations on the internode length, plant height , Length of spike, height of center of gravity, thicknesses of stems, thicknesses of stems, length of basal to panicle tops and fresh weights, and internodes of nodes 1, 2, 3 (N1, N2, N3) The impact of bending force, bending moment and lodging index. The results showed that with the increase of planting density, the plant height increased, the height of center of gravity increased, the ear length became shorter, the stem diameter became thinner and the thickness of stem wall became thinner. The lodging index and the first and second elongation internodes Length was extremely significant positive correlation, and the base of stem thickness, stem thickness was extremely significant negative correlation. The lodging resistance of rice plants can be improved by reducing the length of the first and the second elongate internodes, increasing the thickness and thickness of stalks, decreasing the center of gravity and increasing the spike length. There were differences among varieties with lodging resistance. The resistance to lodging of panicle type Dongnong 427 was stronger than that of panicle type Dongnong 425.