麦后免耕直播杂交水稻的生育特性及产量研究

在田间条件下，选用4个杂交水稻组合，以育秧移栽为对照，研究了两熟制稻区麦后免耕直播杂交稻的生育特性和产量。结果表明：与常规育秧移栽相比，麦后免耕直播杂交稻全生育期和营养生长期有较大幅度的缩短，株高降低，主茎总叶数减少，单株分蘖能力增强，最大叶面积指数增大，分布于较深土层的根量增加，最终单位面积有效穗数增加，但每穗着粒数和实粒数有所降低。不同类型杂交组合直播条件下生育特性和产量构成因素的变化趋势有较大差异，生育特性适宜的杂交组合免耕直播可获得与育秧移栽相近的产量．

Studies on Growth Character and Yield of Hybrid Rice Direct-seeded Associated with Non-tillage after Wheat

An experiment was conducted in field condition to determine the effect of direct-seeding associated with non-tillage after wheat on growth character and yield of hybrid rice. The results indicated that direct-seeding non-tillage after wheat, compared with conventional seedling growing and transplanting, there are so far less in total growth days and vegetative period, trunk height and leaf number on main stem, greater tillering capability, more in leaf-area index and root amount in deeper earth, effective ear figure on final unit area but less in touching and actual grain number per ear. Under the condition of direct-seeding, there were different change trends of growth character and yield constitution factors in different hybrid rice combinations, and the combinations which are of suitable growth specific property are able to obtain well-matched yield level by direct-seeding after wheat with conventional transplanting.