随着黑龙江省垦区水稻种植面积迅速扩大及稻田种植年限的增加,化学除草剂应用使水稻本田杂草群落发生改变。为害较重的难防治的恶性禾本科杂草主要有稗草、稻稗;难防治的阔叶杂草有慈姑、泽泻、雨久花。1化除稻稗和稗草的技术这两种禾本科杂草在黑龙江省5月末至6月初为发生高峰期,随着水稻种植年限的延长,部分地区稻稗逐渐 With the rapid expansion of rice planting area and the growing years of rice fields in Heilongjiang reclamation area, the application of chemical herbicide changed the weed community in Honda rice. Harmful heavier difficult to control the vicious gramineous weeds are barnyard grass, rice barnyard grass; difficult to control the broadleaf weeds arrowheads, Alisma, rain long flowers. A technology for the removal of barnyardgrass and barnyardgrass The two gramineous weeds in Heilongjiang Province in late May to early June peaked with the extension of the rice planting time, rice barnyardin in some areas gradually