Hot! These two days seem to have been pulled into the summer, in fact, it has not really entered the summer, but the weather has obviously felt hot, from the weather forecast shows that the temperature in many places is close to 30 degrees, and even some areas have reached about 35 degrees, so high temperature also makes many people a little worried. And the most worried is the dry hot wind, because the dry hot air of wheat often occurs in the late growth stage, because at this time the wheat root system absorbs water and nutrients The ability to absorb water and nutrients becomes poor, and the absorption is less and the evaporation is large, which is likely to lead to the imbalance of water supply, resulting in the phenomenon of dry and hot air, and this period is also the period of frequent dry and hot wind. How can it be prevented? Can you still water it now? Let's take a look.
First of all, the arrival of high temperature does not mean that the dry hot air is coming, but it should not be ignored. The so-called dry hot air, as the name suggests, must have three conditions: dry, hot and wind, and there are generally the following situations. First, high temperature and drought and a certain amount of wind, wind aggravates the impact of dry and heat, because this weather will make the tips of wheat leaves dry, which will accelerate wheat filling, resulting in dry wheat grains, and ultimately affect the yield, this phenomenon is particularly common in the northern region, and it is also the most important type of dry and hot wind in some parts of the north.
Second, the case of high temperature and sudden sunshine after a rain will also cause wheat wilting and early maturity, which is also often referred to as "forced rain". Third, the temperature is relatively low, but the wind is strong, high temperature (the temperature is not necessarily higher than 30 degrees) will also appear dry hot wind, because the suitable temperature of wheat filling is 20~22 degrees, if the temperature is higher than 25 degrees, the transpiration of the plant will increase, and the filling speed will be accelerated, so that the filling will end in advance, the filling will not be fully completed, and the grain weight will be reduced, resulting in a reduction in yield.
Generally speaking, the average daily temperature is higher than 26 degrees, and higher than 30 degrees in the afternoon is not conducive to grain filling, and when it is higher than 36 degrees, wheat leaves are easy to decline, so that the grain filling will stop halfway, so wheat must be observed frequently in the late growth stage, and do a good job in the prevention of dry and hot wind.
So how can you prevent hot and dry air? First of all, it is recommended that you spray potassium dihydrogen phosphate on the foliar surface, and secondly, watering according to the situation, as long as the soil moisture is enough (the soil is 3~5 cm to be able to hold into a clump) so that the dry and hot air conditions can not be formed, and the impact will naturally be reduced (pay attention to whether you need to water according to the actual situation of your own plot)
Speaking of this, there are two words to say, this period of wheat root absorption capacity is getting worse and worse, if you are ready to water the plot, you should do early watering, watering a small amount of water, so as to avoid watering too late or watering too much drowning and other unnecessary troubles. For example, some people report that the wheat grows well before watering, but after watering, it turns yellow and wilts, which is mostly caused by too late watering or too much watering.
To sum up, wheat dry hot wind is a meteorological disease in the late stage of grain filling, for wheat just in the grain filling stage, if there is drought in the field (2~4 o'clock in the afternoon leaf curl) can be watered to the wheat. If the field moisture is good just after watering, this situation will not have much effect even if the temperature is high. In short, one thing to keep in mind is that watering should not be too late at this time, like in some areas, the wheat is already in the filling period, then it is not recommended to water again, because it is easy to die in watering at this time, so the gains outweigh the losses, so you want to prevent the dry and hot wind field humidity is low in the early stage of filling (watering) the sooner the better.
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