The vigorous growth of lotus roots is also a period of rapid growth of aquatic weeds. There are dozens of species of weeds including alfalfa, sedge, Qianjin, and cattle felt, among which the largest area is alfalfa. Weeds and lotus roots compete for fertilizers, compete for time, and strive for living space, which seriously impedes the growth of lotus roots. If we do not take steps to weed and purify the environment, we will reduce our production.
Summarize the experience of weeding in paddies around the country, mainly from two aspects:
First, agricultural control.
1. Where there are conditions, the regular implementation of flood and drought rotation can significantly reduce weeds;
2, water control suffocation weeds. In the early stage of lotus root cultivation, the irrigation depth is 2-3 cm. When the lotus leaves are 2-3, the irrigation depth can be increased to 10-16 cm, and the deep water can be kept for 4-5 days, killing most weed seedlings.
3. For large-grained weeds that have grown out of the water, they are stepped into the soil immediately after being manually removed;
4, at the same time eradicate the field weeds.
Second, chemical weeding.
1. In the 3-4 leaf stage of weeds, row out the Putian Mingshui, use 12.5% ​​of the cover grass energy, or 35% of the fine stable to kill 40 ml per mu, spray 50 kilograms of water, after spraying 3- Four days of weeds gradually died and died.
2. After 7-10 days of lotus root cultivation, when the water temperature is stable above 20°C, 25% of herbicide ether can be used for 500-750 ml per mu, or 50% of prometryn can be used for 40-50 g per mu, or 25% for weed control. Emulsion EC 500 ml per mu, plus 25% diuron wettable powder 50 grams per mu, respectively, watered 50 kg spray.
3, with 25% of herbicide ether EC 500 ml per mu plus 25% 50 grams per acre per acre to mix, then mix with granular soil of fine soil, spread to the field surface, keep 3-5 cm deep water Layers, visible results in about 5-7 days.
4, with 60% butachlor EC 75-100 ml per acre, or 12% caustic soda EC 125-150 ml per acre, sprayed in the shallow water layer before the weeds germination, grass killing effect is better.
When applying chemical weeding, we should pay attention to three points: First, it is not suitable for spraying on rainy days. Second, when the water temperature is lower than 20°C, no pesticide is applied. Third, it is not suitable for string irrigation between paddy fields after spraying to prevent phytotoxicity.
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