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At present, it has entered a great heat, and cotton has also entered the flowering and ringing period. This period is the peak period of demand for fertilizer in cotton. It has been observed that most cotton fields have been topped, with 12 to 14 fruit branches per plant. Since the cotton plant first needs to ensure the water and fertilizer needs of the cotton boll, the upper part of the fruit is in the weakest position, and almost no cotton field is not lacking in fertilizer.
Don't be fooled by the seemingly strong cotton plant, thinking that there is no shortage of fertilizer, you must look at the fertility performance of the top three fruit branches to determine whether you need topdressing. The main manifestations of lack of fertilizer: the leaves become significantly smaller, the leaves become lighter; the fruit branches are significantly thinner; the color of the flower buds becomes lighter; the upper fruit branches only produce 1 or 2 flower buds, not the third, the first flower buds and the second The size of the flower buds is very different.
Urea has the highest nitrogen content (46%), and the fertilizer efficiency is relatively fast, which is a better choice for top dressing. On the basis of the first mu of urea applied for 10 kg of urea, the cotton field should be applied with 5 kg of urea. If the urea is not applied for the first time or the amount is small, the second dose should be added. If it is not possible to carry out soil topdressing for some reason, it is necessary to carry out foliar spray fertilizer immediately, spray it with 0.5 kg of 2% urea solution per acre, spray once every 5 days, and spray 3 times.
Urea can be mixed with pesticides and acetaminophens, but it should be used now. It is also possible to carry out foliar spray fertilizer at the same time as the soil top dressing, and the two-pronged tube can not be reached because the cotton plant can't wait. If there is heavy rain, soil topdressing and foliar spray can not be carried out, then urea can be sprinkled on the cotton surface in the rain gap, although the fertilizer suffers some losses, but it is much better than not.
Don't be fooled by the seemingly strong cotton plant, thinking that there is no shortage of fertilizer, you must look at the fertility performance of the top three fruit branches to determine whether you need topdressing. The main manifestations of lack of fertilizer: the leaves become significantly smaller, the leaves become lighter; the fruit branches are significantly thinner; the color of the flower buds becomes lighter; the upper fruit branches only produce 1 or 2 flower buds, not the third, the first flower buds and the second The size of the flower buds is very different.
Urea has the highest nitrogen content (46%), and the fertilizer efficiency is relatively fast, which is a better choice for top dressing. On the basis of the first mu of urea applied for 10 kg of urea, the cotton field should be applied with 5 kg of urea. If the urea is not applied for the first time or the amount is small, the second dose should be added. If it is not possible to carry out soil topdressing for some reason, it is necessary to carry out foliar spray fertilizer immediately, spray it with 0.5 kg of 2% urea solution per acre, spray once every 5 days, and spray 3 times.
Urea can be mixed with pesticides and acetaminophens, but it should be used now. It is also possible to carry out foliar spray fertilizer at the same time as the soil top dressing, and the two-pronged tube can not be reached because the cotton plant can't wait. If there is heavy rain, soil topdressing and foliar spray can not be carried out, then urea can be sprinkled on the cotton surface in the rain gap, although the fertilizer suffers some losses, but it is much better than not.
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