免耕直播对常规稻和杂交稻产量形成及土壤理化性质的影响

Effect of no-tillage direct seeding on the soil properties and the yield formation of conventional rice and hybridize rice

2004～2006年在广西农科院水稻试验基地进行田间试验,研究了免耕直播对常规稻和杂交稻产量形成及土壤理化性质的影响。结果表明:杂交稻的分蘖力比常规稻强,穗粒数和千粒重方面占优,产量亦明显高于常规稻,均达极显著差异;在土壤理化性状方面,常规稻和杂交稻的稻田土壤有机质均有累积,腐殖质品质改善,>0.25 mm的团聚体含量及其稳定性均增加,速效磷含量提高,土壤肥力均有所提高,两种水稻田之间没有明显差异。

A field experiment was conducted for three years continuously to study the effect of no-tillage direct seeding （NTDS） on the soil properties and the yield formation of conventional rice and hybridize rice. The results showed that the tillering capability of the hybridize rice was stronger than that of the conventional rice, the grains per spike and the weight per 1000- grains were also higher than that of the conventional rice. However, the effective spikes and the rate of burliness were lower than that of the conventional rice, and the yield of the hybridize rice was higher than that of the conventional rice, there were significant differences at 0.01 level. The content of soil organic matter, the percentage and stability of aggregates in the size group of 〉0.25 mm, and available content P of conventional rice and hybridize rice treatment increased, and quality of humus improved, soil fertility of both conventional rice and hybridize rice treatment increased. However, there were no significant differences in the soil fertility of between conventional rice and hybridize rice.