There are many types and quantities of weeds in dry direct-seeded paddy fields and they are prone to grass shortages. The characteristics and prevention techniques of weeds in dry direct-seeded paddy fields are briefly described below.
Characteristics of weed occurrence (1) Weed species. According to the survey, there are 12 families and 30 species of weeds in dry direct rice fields in the Central Plains of Jiangsu Province. Among them, weeds, Qianjin, Heteromorpha sphenanthera, wild pheasants, Auricularia philippinarum, Moxie and Caixing are the dominant species. With the increase in the number of years of live broadcasting, the grasses in the fields have become more and more complicated. (2) The characteristics of grass. It has been observed that dry direct rice fields begin to grow grass five days after sowing of drowning, 8 days into the first grass peak, and 20 days into the second grass peak. In the field, the grass is the most competitive, followed by the alien sedge, ear and leaf leeches, and wild pheasants; the sedum has a competitive advantage when the weeds are present, and the tillering force is absent when the weeds and sedges are present. Very strong, rapid growth, great harm; other middle and lower layers of weeds in the number and growth of competitiveness are very weak.
In addition to technology (1) closed soil treatment. After rice sowing, use 42% terracotta EC 120ml/mu, or 50% benzyl ibuprofen wettable powder 100~120g/mu, or 30% 100% malondiamide EC 100ml/10% Benzofuran Long wettable powder 20 grams, or 50% butachlor cream 120 ml plus 10% bensulfuron-methyl wettable powder 20 grams, add water 50 kg spray. After application, till the seedlings 1 leaf 1 heart stage to keep moist, can not have stagnant water. (2) Stem and leaf treatment. Usually in the second to third leaf stage of seedlings, use 36% benzyl dichloride wettable powder 50-60 grams per acre, or 25 grams per liter penoxsulam EC 70-80 ml, or 10% flupilsulfuron wettability 25-30 grams of powder, add 50 kg of water spray. More than 1,000 gold fields, can be mastered in Qianjin 3 to 5 leaf stage per acre with 10% cyhalofopert emulsion 80 ml water 50 kg spray. For sedges and broad-leaved weeds, use 13% 2 alpha 4 chlorohydrin 250-300 ml per mu, or 10% azosulfuron-methyl wettable powder 20 g per acre after 4 leaf stage of rice, add water. 50 kg spray. When the pesticide is applied, drain the field water, rehydrate after 36 hours, and keep the water for 3 to 5 days.
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