不同日龄的水稻芽撒播成苗的研究

Research on Survival Seedling of Rice through Different Day-old Bud Seeding-scatting

通过对种子露白、露白后1～7d的不同日龄的水稻芽撒播成苗的研究，证实了种子露白后催芽1～3d，能明显促进苗期的生长发育，提高成苗率．但不能促进水稻生育期的提前．种子露白后2d撒播的成苗率，由种子露白撒播的75．6％提高到84．7％，提高了9．1个百分点．种子露白后催芽3d再练芽1～3d撒播能明显促进水稻整个生长期问的生长发育，成苗率明显或大幅度提高．种子露白后催芽3d再练芽2～3d撒播比露白后2d撒播的成苗率提高3．9以上的百分点，苗期叶龄提早1．3片以上，生长期提早5d以上，分蘖期提早5d以上和抽穗期提早3d等特点；在多条不定根伸出后撒播成苗率大幅下降；为实行练芽取代育秧的水稻乳苗抛秧栽培提供了依据．

The survival seedling of rice were studied through different day The results confirmed that pregermination 1-3 d after seed germination could growth of seedlings and improve seedling rate, but could not promote ahead of pared with scatting at the time of seed germination, the survival rate of seedlin with spreading after seed germination for 2 d. The treatment of spreading aft training bud for 1-3 ing all growth perio training bud for 2-3 by about 3.9 percen tillering stage was 5 vival for t seedling wit raining seedling old bud seeding-scatting significantly promote the rice growing period. Corn g improved by 9.1 percent er pregermination 3 d and d after seed germination could significantly promote rice growth and development d, and increase the survival rate of seedling. Scatting after pregermination 3 d d, compared with spreading after seed germination for 2 d, increased the survival t, the leaf age of seedling was 1.3 piece earlier, the growth period was 5 d earlier d earlier, and the heading stage was 3 d earlier. There was a sharp decline in the sur h spreading after coming out many adventitious roots. The research provides the basis in place of breeding seedling of rice nurseling-throwing.