Winter and winter temperature low tube Mai two attention
When the winter or early spring temperatures are low, there are two things to consider when managing a wheat field:
First, when controlling wheat aphids, red spiders and other pests, spraying omethoate has a better effect than dimethoate. This is because the detoxification efficacy of dimethoate on pests decreases significantly with decreasing temperature, while the efficacy of omethoate is less affected by temperature, even at lower temperatures (below 15°C) The insecticidal effect. Also similar to omethoate is cypermethrin, which is more effective at low temperatures (15°C) than at high temperatures (25°C).
The second is topdressing ammonium bicarbonate better than urea. As the saying goes: "Fertilizer is good, right." Ammonium bicarbonate can be directly absorbed and utilized by wheat after it is applied to the soil, while urea needs to be converted into ammonium carbonate under the action of 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 to 10 days when the ground temperature is 10°C, and only 2 to 30°C. 3 days. It can be seen that application of ammonium bicarbonate is faster than applying urea when wheat is topdressed in winter or early spring; if urea is used, the growth of wheat seedlings will also be affected by slower fertilizer efficiency.
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