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我省常年种植水稻面积700万由左右。由于水稻生长在夏季,气温较高,田间有充足的水,所以杂草发生危害非常严重,对水稻产量影响很大,一般可使水稻减产20—30％,个别严重草荒地块,减产幅度更大。由于我省南北地理位置和气候条件的差异,稻田杂草的种类、分布、数量和危害程度均有差异,根据样方调查统计,可分为豫南稻区、豫东稻区和豫北稻区。豫南稻区的杂草优势种为稗子、牛毛草、扁杆藨草、异型莎草、水莎草、野荸荠、矮慈姑、鸭舌草等。豫东稻区的杂草优势种为水毛花、稗子、水莎草、鸭舌草、耳叶水苋菜、牛筋草等。豫北稻区的杂草优势种为水莎草、稗子、扁杆藨草、芦苇、水苋菜等。
The annual planting area of rice in our province is about 7,000,000. As rice grows in summer and the temperature is relatively high, there is sufficient water in the field. Therefore, weeds are very harmful and have a great impact on rice yield. Generally, the yield of rice can be reduced by 20-30% Big. Due to the difference of geographical location and climate conditions in south and north of our province, the species, distribution, quantity and degree of damage of weeds in paddy field are different. According to the sample survey, we can be divided into southern rice area, eastern Henan rice area and northern Henan rice Area. The dominant species of weeds in southern Henan rice area are barnyard grass, Bruggera, flat barnyardgrass, Shaped sedge, water sedge, wild water chestnuts, dwarf arrowheads, Monochoria. The predominant species of weeds in the rice planting area in east Henan are plum, barnyard grass, water sedge, monocotyledon, earwort amaranth, goosegrass and the like. The dominant species of weeds in the rice fields in northern Henan were water sedge, barnyardgrass, flat barnyardgrass, reed, amaranth and so on.