稻田保护性耕作研究——I.免耕对水稻产量、生长动态及害虫数量的影响

Studies on Paddy Field Conservation Tillage

通过对水稻免耕与常耕栽培对比实验,结果表明,免耕抛秧水稻的产量性状优于对照(常耕移栽)和其它处理,产量比对照高3.95%～11.57%,处理4与处理1之间差异达到5%显著水平,其它处理间差异不显著.处理4水稻的有效穗数多于其它处理,叶面积指数和干物质积累均大于其它处理.在分蘖盛期、拔节期、孕穗期和黄熟期,免耕处理的根系活力比常耕处理分别强28.1%、7.4%、28.3%和34.9%.常耕处理的二化螟和稻纵卷叶螟比免耕处理分别多16%和94%.

Comparative experiments were conducted to study the effects of tillage patterns on rice root activity and mass quantity. The results showed that the rice yield properties of treatment Four were superior to the control and other treatments, the yield compared with that of the control was increased by 3.95% - 11. 57% , the difference between treatment Four and treatment One was significant（5% level） , but there was no significant difference among other treatments. The number of effective spikes of treatment Four was larger than that of others, so were the LA1 and dry- matter accumulation. At the vigorous tillering stage, elongation stage, booting stage and yellow - maturity stage, the root activity of the no -tillaged rice was 28.1% ,7.4% , 28.3% and 34.9% stronger than of the traditional tillaged respectively. The quantities of Chilo suppressalis and Cnaphalocrocis medinalis Guen6e of the traditional - tillaged rice were 16% more and 94% more than those of the no - tillaged rice respectively.