Wheat winter and spring management two attention
In winter or early spring when the temperature is low, the following two points must be taken into account in the management of wheat fields: First, when controlling wheat aphids, red spiders and other pests, spraying omethoate has a better effect than dimethoate. This is because the toxicity of dimethoate on insect pests decreases significantly with decreasing temperature, while the efficacy of omethoate is less affected by temperature, and even at lower temperatures (below 15°C), it is normal. Insecticide effect. Similar to omethoate, cypermethrin is also available. The toxicity of this insecticide at low temperatures (15°C) is stronger than at high temperatures (25°C). The second is that ammonium bicarbonate is better than urea when top dressing. As the saying goes: “Fertilizer is good, right.†Ammonium bicarbonate can be directly absorbed and used by wheat after it is applied to soil, and urea needs to be converted into ammonium carbonate by urinary bacterial enzymes in the soil for root absorption. Here, the rate of urea conversion mainly depends on the soil temperature at that time; under normal circumstances, all the urea applied to the soil is converted to ammonium carbonate, which takes 7-10 days when the ground temperature is 10°C, and only 2 when the ground temperature is 30°C. -3 days. Visible, wheat in the winter or early spring top dressing, ammonium bicarbonate effect faster than urea. If urea is used, the growth of the wheat seedlings will be affected by the slowness of the fertilizer effect. China Agricultural Network Editor