Integrated control of weeds in wheat fields
Wolfberry Nectar,Natural Wolfberry Nectar,Pure Wolfberry Nectar,Canned Wolfberry Nectar NINGXIA STARLIGHT FOOD TRADE CO.,LTD , https://www.starlightfood.com
1. Types of weeds There are about 30 species of weeds in winter wheat fields, including burr grass, alfalfa, gray green rattan, ash green sophora, lone vegetable, mustard, Ze lacquer, field bindweed, rice vase, valerian, etc. Heavier occurrences. There are more than 20 species of weeds that are seriously endangered in spring wheat fields. They include alfalfa, wild oats, field bindweed, reeds, wild mustard, radicchio, flat larvae, and large spiny worms.
The difference in soil salinity can cause structural changes in the weed communities in wheat fields. When the soil salinity reaches 0.3% or more, weeds are the dominant species. When the soil salinity is about 0.1%, weeds Declined, Setaria increased, when the soil salt content of 0.04% to 0.05%, drought and flood as the dominant species.
2. Characteristics of weed occurrence Winter weeds in winter wheat have a peak of emergence from late October to mid-November. The number of seedlings accounts for 95% to 98% of the total. There are a few weeds from late March to mid-April the following year. Emergence. Severe weeds usually come from weeds that occur before winter, and they have high density, large single plant growth, strong competitiveness, and heavy damage. They are the focus of prevention and control. Pre-winter weeds are in the seedling stage, with small plants, young tissues, and sensitivity to pesticides, which are favorable opportunities for prevention and control. In the spring of the following year, drug resistance was relatively increased and the effect of medication was relatively poor. Therefore, chemical weeding in wheat fields should be applied during the sensitive period of weeds in the winter to achieve the best weed control effect, as well as to reduce the phytotoxicity caused by herbicides that are too long in the field.
The occurrence of weeds in spring wheat fields is closely related to the temperature and precipitation in early spring. In early spring, the temperature is high, rainfall is high, the snow thawing is early, weeds occur early and heavy, otherwise they are late and light, and the weeds occur in the middle and late April. In mid-May, the appropriate period for the chemical control of spring wheat weeds.
Second, comprehensive prevention and control of weeds in wheat fields
1. Rotation of crop rotation There are different associated weeds or parasitic weeds in different crops. These weeds are the same or similar to the living environment of crops. Scientific crop rotation is used to change cropping conditions and change the external ecological environment of weeds. Can significantly reduce the damage of weeds.
2.Deeply plowing through the deep plowing to weed the seeds of the weeds scattered on the surface of the soil in the previous year, so that they can not germinate and sprout seedlings. At the same time, they can prevent bitter leeks, sting vegetables, field bindweed, reeds, and flat stalks. Weeds, such as cane grasses, cut off their underground rhizomes or expose them to the surface to make them dead.
3. Soil treatment 1 Before application of sowing, serious plowing occurs in wild oats. Before planting, 40% oatmeal milk can be used with 175-200 ml/667 square meters of water. Spray evenly on the ground, and apply it promptly after application. The wafers were placed on the ground and the chemicals were mixed in a 10 cm soil layer and then sowed. It also has a good control over the aunt and bluegrass.
2 Before seedling sowing, chemical herbicides are used to seal the soil, and the wheat field before sowing can have more obvious effect. The agents used are: 25% chlorotoluron WP 200-400 g/667 m 2 , adding 50 kg of water, spraying 2 days after sowing of wheat, surface treatment, or 50% Praxanthine WP 75～ 100g/667 square meters, or use 50% each to kill grass alkaloid oil and 48% cable oil 100ml/667 square meters, mixed with water sprayed on the ground, can effectively control grass weeds and some broad-leaved weeds.
4. Removal of weeds Weeds in wheat fields are one of the main sources of weeds in the field. They are brought into the field by wind, running water, human and livestock activities, or spread through the underground rhizome to the field. Therefore, they must be removed to prevent the spread of weeds.
5. Stem and leaf treatment Chemical control of wheat field weeds is mainly applied during the wheat growing period. When spring wheat fields are dominated by broad-leaved weeds, DuPont Superstars, dimethyltetrachlorobenzene, and Maixi can be used to treat stems and leaves. Generally, 75% of DuPont Superstar Dry Suspension has 667 square meters of 0.9-1.4 grams, 20% of dimethyl tetrachlorohydrin with 250 milliliters/667 square meters, and 72% of 2.4-D Butyl Ester Cream is 60-80 ml/667 square meters. m, 5.8% Mai Xi suspension agent dosage is 10 ml/667 square meters, 48% herbicidal water agent dosage 20-30 ml/667 square meters, 48% Bentazon water agent dosage 130-180 ml/667 Square meters, add water for stem and leaf treatment.
For wild oats and other monocotyledonous weeds mixed with broad-leaved weeds, herbicides such as 75% superstars and 6.9% of thrips, methamphetamine and bentazon, paraquat, and paraquat can be used. Net or with the farmer, 2.4-D butyl ester and tigris, etc. mixed use, can expand the grass spectrum, effectively improve the weeding effect. Application time is generally after the return of green wheat to the beginning of jointing, spray the method to be appropriate, when spraying to avoid the bad weather, low temperature, drought, cold waves and other bad weather.
6. Biological control The use of small-winged moth to control Pleurotus citrinopileatus has been applied in practice. In the future, it is necessary to strengthen the excavation and utilization of such control measures. In particular, the prevention and control of certain vicious weeds will be an economic process. And long-term measures.
Author unit: Yili 72 group 7 company