不同生态条件下华抗草78水稻对杂草的干扰控制作用

对不同水稻叶龄、水层深度、水稻密度和保水时间条件下水稻对杂草控制效果进行研究.结果表明，具有化感特性的水稻品系华抗草78对稗草、鳢肠、异型莎草等杂草的抑制率显著优于无化感特性品种Lemont；华抗草78对0～1.5叶期稗草和0～0.3叶期异型莎草的控制效果优于1.5～2.4叶期稗草和0.8～2.0叶期异型莎草；移栽时叶龄与栽插密度互作有利于提高华抗草78对杂草的防效，并明显高于移栽时叶龄分别与水层深度和保水时间互作效应.适当提高水稻移栽时的叶龄、增加移栽密度可显著提高华抗草78对供试杂草的抑制率.

Interference of allelopathic rice Huakangcao 78 on weeds under different ecological conditions.

A pot culture experiment was conducted to examine the interference effectiveness of allelopathic rice Huakangcao 78 on weeds Echinochloa crusgalli L., Cyperus difformis L., and Eclipta prostrata L. as affected by rice leaf age during transplanting, plant density, and soil surface water depth and its retaining days. The results showed that Huakangcao 78 could significantly reduce the dry weight of weeds compared with non-allelopathic rice Lemont. The control effectiveness of Huakangcao 78 on E. crusgalli L. was better when the weed was at 0-1.5 leaf age than at 1.5-2.4 leaf age, and that on C. difformis L. was better when the weed was at 0-0.3 leaf age than at 0.8-2.0 leaf age. The interactive effectiveness between rice leaf age during transplanting and plant density on weed control was better than that between the leaf age and soil surface water depth and its retaining days. To increase the rice leaf age during transplanting and plant density could significantly promote the control effectiveness of Huakangcao 78 on weeds.