不同穗型不同行向水稻穗遮光问题理论研究

Studies on panicle shading of rice with different row directions and spike types

摘要: 分析了不同穗型不同行向水稻穗对行间的遮光时间、遮光部位及遮光长度，结果表明穗遮光时间在临界高度以上南北行向比东西行向长。对南北行向，穗遮光部位上午随时角的增加逐渐向下移动，东西行向在临界高度以上与南北行向趋势相似，在临界高度以下则随时角的增加先逐渐向下移动，而后又向上移动至临界高度。穗遮光长度在0至穗长之间。对比不同重量穗型可知，弯曲穗型穗对行间遮光影响小，对行内遮光影响大。

Abstract: The panicle shading of rice with different row directions and spike types was studied.It showed that the panicle shading time in N-S row was longer than that in W-E row on critical altitude.In the morning,the altitude of panicle shading moved from the spike top to bottom in N-S row.As to W-E row,the altitude of panicle shading was same to the N-S row at first,then the altitude of panicle shading from bottom to critical altitude.The panicle shading length was from zero to spike length.