持续高温,打顶后的棉花如何管理?

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三天即将来临!从7月12日到8月20日,整个四个!十!天!继续高温!湿!闷热!

在这种天气下,许多种植者都非常担心。如何在高温和高温条件下刚刚打好的棉花安全冷却?

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当日平均温度为25-30°C时,天气晴朗,棉花授粉最有利。高于30°C,天气炎热干燥或暴风雨,开花和响铃会受到影响;当植物之间的温度超过35°C时,大约20%的花药不能开裂,超过30%的花粉不能发芽,影响开花授粉,增加幼铃的脱落率,导致产量减少。

简单地说,棉花很容易在高温条件下“中暑”。它会选择不先被热量杀死,所以它会蒸发大量的水并在中午拉叶子。

此时,为了防止水分蒸发,叶片会增加表面的蜡质。

其结果是花粉的受精很差,导致大量落花和果实。

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所以我该怎么做?

为了减轻高温胁迫对棉花的不利影响,建议:

首先,在打顶后做好控制工作

通常,在棉花打顶3天后,氯胺酮的量为5-7克(优选悬挂喷雾),7天后,氯胺酮的量为15-20克。

氯胺酮的量第二次如此之大,主要是为了完全控制棉花,不要让它长得更长和侧枝,这样棉花就可以在棉铃上使用所有吸收的肥料。

其次,滴漏应及时,增加滴水的频率

这意味着要少一点,而且频率要大一些。

Since high temperature and drought are the most harmful to crops, and it is still impossible to control the occurrence of high temperature weather, starting from drought prevention work and timely irrigation, not only achieve the purpose of water temperature regulation, but also ensure the water supply of crops. To reduce high temperature hazards.

In general, three drops of water are given in July, each time around 10 days. At the same time, the principle of grasping the dripping water is “see dry, dry and dry”, but the amount of dripping should not be too large. In July, the high temperature, sand land water and fertilizer retention capacity is poor, it is recommended to drip 4-5 times in July.

This will help reduce field temperature, increase humidity, increase cotton sitting rate, and strengthen field water management to reduce wastage of water resources.

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Third, after the top is finished, the fertilizer can be dripped and humic acid is added.

After the top water, 3-4 kg of urea, 5 kg of phosphate fertilizer, and 3 kg of potash;

The usage of the second water consumption is the same as above;

After the top third water urea 6-10 kg, phosphate fertilizer 5 kg, potassium fertilizer 4 kg.

At the same time, according to the situation, increase the amount of phosphorus and potassium fertilizer, especially the amount of potassium fertilizer, so that more nutrients go up first, so hot, do not eat something will collapse.

As the cotton roots after aging become aging, the "workload" of the roots has increased. Therefore, it is recommended to add about 300 grams of humic acid when dripping, which can promote rooting and prevent root aging; improve the drought resistance of cotton;

4. Application of boron fertilizer and zinc fertilizer

In order to prevent falling flowers and falling buds, you can spray Zn and Zn fertilizers 2-3 times. According to the current situation, it is generally possible to use 30 grams. In the full bloom period, 50 grams can be used, which should be adjusted according to the actual situation.

For the application of the application, it is recommended that about 50-80 grams of zinc fertilizer and boron fertilizer.

Both the boron fertilizer and the zinc fertilizer require a second dilution, whether it is spraying or dripping.

xxV. Prevention and control of pests and diseases

Focus on the control of cotton bollworm, red spider cotton leafhopper and other pests, to avoid a large number of falling buds caused by pests and diseases.

Control of cotton bollworm: It is recommended to use a vitamin salt or 9080 (chlorantraniliprole).

Red spider control: It is recommended to use professional acaricides such as avermectin + 哒螨灵. Use different acaricides to rotate to prevent the red spider from becoming resistant.

Cotton leaf mites: When cotton leaf mites enter the cotton field, they should be beaten as soon as possible. One spot was found to be hit, and the damage of cotton leaf mites was controlled to a minimum. It can be controlled by using 20% triclosanol 1000 times solution and dicofol sulfone 800 times solution.

The above dosage is only the theoretical recommended dosage, please choose according to your own situation.

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