摘要
试验结果表明 ,稻草还田免耕直播稻比常耕抛秧稻分蘖早 1 0 - 1 3天 ,分蘖节位低一个节位 ,成穗率高 6 .82个百分点 ;单株总根数多 88.9条、根总长多 90 2 .9cm、根系体积多 4 .7cm3、根系干重多0 .91g ;后期绿叶数多 0 .7张 ,假茎粗 0 .0 8cm ;每 667m2有效穗多 1 .61万穗 ,每穗总粒数多 3 .9粒 ,每穗实粒数多 5 .7粒 ,结实率多 2 .0 2个百分点。不同的耕作方式相比 ,直播稻比移栽稻生育期缩短 3 - 6天 ;穗粒结构以稻草还田免耕直播稻最好 ,产量也最高 ,比非还田免耕直播稻增产 4 .78% ,比免耕抛秧稻增产 6 .39% ,比常耕直播稻增产 1 1 .79% ,比常耕抛秧稻增产 1 1 .39%。不同留桩高度对免耕直播稻产量没有直接的影响 ,免耕直播稻纹枯病为害较轻 。
s The experimental result showed that stump separating of straw returning-to-field, \ plowing-free and direct sowing rice was 10-13 days earlier than the normal plowing and seedling-throwing rice,that a separating stump was one node lower than an original one,and that a higher ear bearing is 6.82%, the total of per shoot for a single plant 88.9, the total length of a shoot 902.9cm, the volume for per shoot root 4.7cm 3, the net weight for per shoot root 0.91g, the late green leaves 0.7 pieces, the thickness for a stem 0.08cm, the available ear 16.1 thousand with a total of 5.7 grain for per ear, 39 grain more than the normal one and an ear bearing percentage is 2.02 percent high. A comparison of the different cultivation showed that the bearing duration for direct sowing rice was less 3-6 days than direct sowing rice, the grain structure of each ear for straw returning to field, free-plowing and direct sowing rice was the best, and the yield was the highest, increasing by 4.78% comparing to non-returning-to-field, plowing-free and seedling-throwing rice, increasing by 11.79% comparing to the normal plowing and directsowing rice, increasing by 11.39% comparing to the normal plowing and seedling-throwing rice. The height of the different stump-keeping node had no direct effect on the yield of plowing-free and direct rice while plowing-free direct sowing rice Dothistroma pini was less harmful. In particular, returning-to-field, plowing-free and direct sowing rice Dothistroma pini was the least harmful.
出处
《广西农学报》
2004年第5期1-6,共6页
Journal of Guangxi Agriculture
基金
广西农业重点技术推广项目
关键词
免耕直播
稻草还田
试验研究
Plowing-Free and Direct Sowing Cultivation Method Experimental Research
