The effect of reasonable spraying Brassi Shuofeng 481 on cotton is good.
Shuofeng 481 is a brassinolide product extracted from plant pollen and its derivatives. it comes from plants and acts on plants. It has the functions of promoting cell division and elongation, promoting photosynthesis, delaying senescence, improving stress resistance and so on. It has a variety of effects of auxin, gibberellin and cytokinin. Cotton is a crop with a long growth period, and its growing season goes through the process from low temperature to high temperature to low temperature and from high humidity to drought. Brassi Shuofeng 481 is sprayed reasonably in the whole growth period of cotton. It plays an important role in promoting cotton growth, improving its stress resistance, promoting early maturity, increasing yield and improving quality. Its usage is to spray 50 kg of water with 6g Shuofeng 481 powder or 15ml water per mu. If it can be sprayed together with trace elements such as boron, zinc and foliar potassium fertilizer (such as high-energy red potassium), the effect will be better. The effect and frequency of spraying in different periods are as follows:
1. Application at seedling stage: cotton seedlings have many overcast and rainy weather, low temperature, high humidity and many diseases, which is not conducive to the early emergence of strong seedlings. Spraying Shuofeng 481 twice at seedling stage can improve the ability of resistance to low temperature at seedling stage, promote root growth and reduce the occurrence of diseases such as blight, which is beneficial to strong seedlings and promote early development, and can promote flower bud differentiation, fight for more buds and buds, increase Fuqian peach, and lay the foundation for high yield.
2. Application at bud stage: spraying Shuofeng 481 at bud stage can promote the growth and development of buds and cotton plants, but the southern cotton area is in the plum rain season at this time, with high temperature and humidity, and cotton is easy to grow. Therefore, it is generally not suitable to spray Shuofeng 481 to avoid overgrowth, but it can also be sprayed once for cotton fields with weak growth or good plant type control.
3. Application at flower and boll stage: the flower and boll stage is the most exuberant period of cotton vegetative growth and reproductive growth, and it is also the key period of yield formation. the competition between vegetative growth and reproductive growth is fierce, while the southern cotton area enters a period of high temperature and drought, which can easily lead to bud and boll shedding. Spraying Shuofeng 481 can improve the level of cotton plant hormone growth, increase photosynthesis, promote the production of assimilation products and transport to buds and bolls, and increase pollen activity. Promote normal fertilization, improve the resistance of cotton to high temperature and drought, reduce physiological bud and boll drop, and promote the growth and development of young bolls.
4. application in boll opening stage: boll weight and fiber quality were determined in boll opening stage, when the temperature began to decrease, root absorptive capacity weakened and vegetative growth declined. Spraying Shuofeng 481 can prevent premature senescence, maintain high photosynthetic capacity, promote the transport of nutrients to cotton bolls, increase boll weight and lint percentage, increase the number of autumn peaches and control rotten peaches.
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Occurrence and Control of Red Leaf Stem Blight in Cotton
Disease symptoms and occurrence regularity: cotton red leaf stem blight is a kind of fulminant disease that often occurs in the middle and later stage of cotton. It can make the leaves turn red from the bottom up until they fall off. The veins remain green, the mesophyll turns red, and the leaves become thicker, brittle, wilted and finally fall off. Cutting the stem without changing color can be distinguished from cotton wilt and Verticillium wilt. Generally in the old cotton area, the cotton fields with continuous planting, sandy land, shallow plough layer or lack of potassium fertilizer are more serious. In the middle and later stage of drought, the serious lack of potassium and zinc in the soil can easily lead to the acceleration of the disease.
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Strange phenomenon of cotton: young peaches in the middle and upper parts crack ahead of time
Recently, some farmers called to reflect a strange phenomenon in cotton production: the lower big bolls and early cotton bolls grew normally and did not open bolls, while the tender bolls in the middle and upper parts cracked ahead of time, and some of them rotted bolls after cracking. Wuqiao County Agricultural Bureau immediately organized technicians to go deep into the field to find the reason. First, the field showed that the sowing was too early. In the early cotton fields where there were no buds or few buds in the upper 1 and 3 fruit branches due to Rain Water or diseases and insect pests, the number of cracking of cotton peaches in the middle and upper part was relatively large, that is, the outer bolls of 7 fruit branches and 10 fruit branches were counted from below.
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