Pay attention to the prevention of dry hot air in the later stage of planting wheat

Dry and hot wind is a frequent meteorological disaster in the late growth stage of wheat. the yield of wheat can be reduced by 5%, 10%, and more than 20% in some serious cases. The harm of dry and hot wind to wheat is mainly due to high temperature, drought and strong wind, which causes a large amount of water in the air and soil to evaporate, and the water in the wheat is consumed very quickly, thus destroying chlorophyll and other pigments and hindering photosynthesis. As a result, the plant is quickly dried from the bottom to the top. In early summer, it is the wheat filling period, such as the dry and hot wind is disadvantageous to grain filling, the wheat is withered ahead of time, the wheat grain is withered, and the grain weight decreases, which leads to a serious reduction in wheat yield.

Preventive measures: 1. Skillfully watering wheat yellow water. Watering wheat yellow water about 10 days before wheat maturity can obviously improve the microclimatic conditions in the field, reduce the harm of dry and hot wind, and be beneficial to wheat field interplanting and summer sowing. It is observed that watering wheat yellow water can reduce the temperature of wheat field by about 2 ℃, and increase the 1000-grain weight of wheat by 0.8murl 1g.

two。 Spray fertilizer on the leaves. During the period from flowering to early filling stage of wheat, foliar fertilizer was sprayed with 1% Mel 2% urea solution, 0.2% KH 2PO 4 solution, 2% Rue 4% superphosphate leach solution or 15% Rue 20% plant ash leaching solution, each time spraying 20Mu 100kg per mu, which can accelerate the growth and development of wheat in the later stage and prevent or reduce the harm caused by dry and hot wind.

3. Spray vinegar on the leaves. In the small filling stage, foliar spraying with 0.1% acetic acid or 1 ∶ 800 vinegar solution can reduce the opening angle of stomata on leaves, inhibit transpiration, and improve the ability of drought and heat resistance of plants; at the same time, acetic acid (vinegar contains about 4.5% acetic acid) can neutralize the free ammonia produced by plant degradation at high temperature, thus eliminating the harm of ammonia to wheat.

4. Foliar spraying hormone: ① sprays 1000 times petroleum growth aid solution 50 kg per mu from flowering to filling stage, which can defend against hot and dry wind, increase 1000-grain weight, and increase average yield by 7.8%. ② spraying 40 mg / kg naphthylacetic acid solution 50 kg per mu before wheat filling could increase 1000-grain weight. ③ spraying 60 mg phenoxyacetic acid solution 25 kg per mu during wheat filling period can also protect against hot and dry wind and increase 1000-grain weight.