【摘要】 早稻田草害严重。作者于1990—1991两年对4个不同时期杂草进行调查并利用紫云英、绿豆、鸡眼草和大叶胡核子等4种绿肥作物抑制相应时期的杂草,进而取代杂草群落的生物防治方法进行试验。经调查:早稻田杂草种类共23科、99种。1990年按4种不同模式的绿肥和杂草的生长量进行了相关分析,说明了绿肥抑草的效果。由于紫云英、鸡眼草和大叶胡枝子的种子成熟后脱落,1991年在田间自然形成群落,抑制并进而取代了杂草群落。同时绿肥作物还有增肥、调温等作用,促进旱稻生长。更多还原

【Abstract】 Weed damage is one of the main contradictions in the field of perenial upland rice. The field survey showed that, there are 98 weed species, 22 families in the field of perenial upland rice. Of these, 7 species are the main weeds, including Solive anthemifolia R. Br. , Allernanthera philoxeroides (Mart. ) Griseb. , Centella asiatica (L. ) Urban, in spring and Eleusine indica(L. ) Gaertn, Kyllinga brevifolia Rottb. , Juncellus serotinus (Rottb. ) C. B clarke and Cynodon dactylon (L. ) Pers. in autumn. Four green manures were used to control the weed communities at four periods in the upland rice fields. The statistical analysis on the relationship between four growing-manners of green manures with biomass amounts of weeds showed that the growth of green manures has an effective weed-depressing effect. The seed drops of Austragalus sinicus, Kummerowia striata and Lespedeza davidii naturally formed a community of green manure in 1991 , which depressed and replaced the original weeds in the fields of perenial upland rice. Green manures can also increase the manure efficiency, regulate the temperature, thus inprove the growth of perenial upland rice.更多还原