In the past two days, I have been discussing with you some issues such as watering and spraying during the heading and flowering period of wheat, including saying that it is best not to water and spray during the flowering period, and the best time is the best time to see flowers sporadically. However, due to various factors in the process of wheat growth, sometimes we can not help it, so we may also be watered during the flowering period, if you have to water and spray, you must avoid the full flowering period, choose to carry out in the afternoon, some people may say that this will affect wheat pollination, etc., but this is also no way. Having said that, I would like to remind you here today that the following pesticides must be avoided during the flowering period of wheat, otherwise it is easy to cause the phenomenon of ears without grains, which will seriously affect the yield.
As we all know, the flowering stage of wheat is the key period to determine the number of grains per spike, and wheat is very sensitive to pesticides during this period, and wheat is also relatively fragile at this time, and a little improper management will affect pollination, resulting in the situation of ears without grains. First of all, it has fumigant fungicides, such as chlorobromoisocyanuric acid, etc., and this kind of gaseous fungicides are not recommended to be sprayed during the flowering period.
In addition, fungicides with metal ions are also not recommended to be sprayed, such as ammonium decozeb, mancozeb, copper preparations, etc., because regardless of fumigation or metal ion fungicides, when the temperature is high (especially when the flowering period is in full bloom), cations will be released, so that the combination with the silver ions of the crop itself will instantly cause pollen to lose its vitality, thereby affecting pollination, so this kind of fungicide is not recommended to be sprayed during the flowering period.
Secondly, it has fumigant insecticides, especially organophosphorus pesticides, such as phosphine, methylpyrimidine, etc., because fumigant pesticides also release cations. In addition, do not use old medicines, the old drugs will be vaporized for a long time, and the formation of hydrogen sulfide will also cause the pollen to lose its vitality, so regardless of fungicides or insecticides, as long as there is a pungent smell when opened, do not spray during the flowering period to avoid unnecessary trouble.
Finally, herbicides should not be sprayed during the flowering period, because spraying herbicides will inhibit the growth of pollen tubes and cannot carry out normal pollination, resulting in a situation where there are no grains or few grains in the ears.
Some people may say that it is okay to spray during the flowering period, but I do not recommend everyone to try, because the wheat flowering period is only three days, there is no need to take this risk, not to mention that if the high temperature is encountered during the flowering period, it is easy to cause the situation of ears and no grains, so remember not to spray the above agents during the flowering period.
The flowering period of wheat is also the second time to increase the yield package spraying period, spray the second time to increase the yield package as far as possible to use safe and efficient agents, the above and pungent smell of the agent is best not to use, so as to safely and effectively control pests and diseases and play a role in the root and leaf protection, to ensure that the wheat can bloom more, more grain.
To sum up, although the wheat flowering period can be watered and sprayed, but this is also no way, especially the above-mentioned pesticides must not be sprayed, to avoid causing the situation of ears without grains, and spraying should avoid the full flowering period. If you have to spray during the full flowering period, it is recommended to spray after 4pm. In fact, the same is true for watering, the same should avoid the full flowering period, choose to carry out after four o'clock in the afternoon, and watering during the flowering period must not take sprinkler irrigation, which will cause the pollen to absorb water and expand and swell, affecting wheat pollination. In short, the wheat flowering period is very critical, management must pay attention to, take spraying as an example, if the wrong spray is likely to cause a reduction in yield, so wheat field management can not be relaxed, not sloppy.
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