After the Spring Festival, the temperature gradually increased, and wheat growth began to accelerate. However, there are many weeds in wheat fields in some producing areas in China, and red spiders and spotted yellow-brown mosaic disease appear in some fields, and timely field management is required. In addition, there are a small number of plots with weak seedlings caused by late planting or other reasons. Spring wheat field management should be strengthened to eliminate various unfavorable factors and ensure a bumper wheat harvest in 2017.
Timely field chemical weeding
Wheat field weeds have a great impact on the growth of wheat. Generally, no chemical weed control is performed in winter, and it should be carried out in time in spring, and chemical herbicides are sprayed during the greening and jointing of wheat.
Control of gramineous weeds: Vicious weeds such as wheat, brome, poisonous wheat, and bluegrass must be effectively controlled by Shima. Wild oats and wheatgrass can be controlled by horses. All grasses can be selected for control. To master the dosage, use 6.9% 40% horse water emulsifiable concentrate 40ml and spray with 40kg of water; use 3.6% quasma water dispersant 24g ～ 30g and spray with 40kg water; use 3% sema emulsifiable oil per acre 25ml ～ 30ml, spray with 40kg of water, strictly control the dosage to avoid phytotoxicity.
Broad-leaved weed control Before the wheat returns to the jointing stage, the field weeds are sprayed with herbicides in the 2 to 4 leaf stage. Artemisia sojae, Amaranth, Oleifera, etc. can be sprayed with 1 to 1.2 grams of 75% besulfuron-methyl dry suspension.
Poaceae and broadleaf weeds can be mixed for prevention and control with 72% 2,4-D butyl ester butter 25ml-30ml or 10% besulfuron-methyl wettable powder 10g, with corresponding amounts of ema, Shima, and Kusima Mix and mix, add 40 kg of water spray, can effectively control all kinds of weeds.
Timely application of effective fertilizer
1. For wheat fields that are deficient in fertilization at the time of sowing and obviously lack of fertilizer, they should continue to apply 8 kg to 10 kg of urea on the acres during the jointing stage.
2. For the weak seedlings in different conditions before wintering, the wheat fields with poor seedling conditions after the beginning of spring should seize the opportunity to timely and effectively apply urea, and the amount of fertilizer is generally 8 kg to 9 kg / mu. Apply 4 to 5 kg of phosphorus and potassium fertilizers to ensure fertilizer efficiency.
3. For wheat fields that were severely damaged by freezing damage years ago and have not recovered, increase the intensity of field management based on the situation of the seedlings, apply 10 kg to 12.5 kg of fast-acting fertilizer urea at the root and cooperate with watering, and spray foliar fertilizer 2 to 3 at the same time Secondly, cultivating raises ground temperature, promotes root development, promotes spring tillers, and ensures that spring tillers become spikes.
4. Topdressing of wheat in strong seedlings can be postponed appropriately, and appropriate topdressing can be performed when the wheat enters the jointing stage.
5. Wheat fields with a long and strong trend are under deep-cultivation or pan-grinding repression, and in the middle and late stages of jointing, they will chase 10 kg to 12.5 kg of urea.
Early pest control
After entering spring, as the temperature gradually rose, wheat sheath blight and soil-borne yellow mosaic disease began to infect a large number of wheat plants, and the diseased plant rate increased significantly. The surge period was at the jointing stage. Due to the great impact on yield, it was generally The wheat yield is reduced by 10% to 20%. Therefore, timely control should be carried out according to the development of the disease during the jointing stage of wheat.
Wheat sheath blight can be used with 35% triazolone (fenrustin), 43% Po Sui emulsion, 22.5% enazol, etc., and can also treat wheat powdery mildew and rust. Wheat fields that are harmed by soil-borne yellow mosaic should be rooted with quick-acting nitrogen fertilizers 1 or 2 times, foliar spraying quick-acting nitrogen fertilizers, foliar fertilizers 3 to 5 times, and shallow and middle tillage to increase ground temperature, or spring wheat fields, 50% per mu. Phoxim 50ml + 4.5% beta-cypermethrin 50ml + virus gram 15g + high-efficiency foliar fertilizer 25ml add water 30kg ~ 40kg spray control.
For red spiders and aphids in some wheat fields, use 20% pyridaben wettable powder 1000-1500 times, 15% pyridaben EC 2000-3000 times, 40% dimethoate EC or 50% malathion EC 2000 times liquid spray and other agents can effectively control red spider.
Prevent or reduce night frost damage
After the Spring Festival, the temperature varies, wheat growth speeds up, but its resistance to low temperatures decreases significantly. Therefore, according to the weather forecast, irrigation should be carried out before the cold current approaches to increase soil moisture and atmospheric relative humidity. Foliar spraying of a sugar solution increases the sugar content of leaf cells to increase cold resistance and effectively prevents or reduces freezing damage.
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