Reasonable spraying of brassin with Shuofeng 481 on cotton gives good results

Shuofeng 481 is a brassinolide product extracted from plant pollen and its derivatives. It comes from plants and acts on plants, with functions such as promoting cell division and elongation, promoting photosynthesis, delaying senescence and improving stress resistance, and combines multiple effects of auxin, gibberellin and cytokinin. Cotton is a crop with a relatively long growth period, and its growing season goes through a process from low temperature to high temperature and then to low temperature, and from high humidity to drought. Reasonably spraying brassin Shuofeng 481 throughout the whole growth period of cotton plays an important role in promoting cotton growth, improving its stress resistance, promoting early maturity, increasing yield and improving quality. The method of use is to use 6 grams of Shuofeng 481 powder or 15 milliliters of liquid formulation per mu, dilute with 50 kg of water and spray. If it can be sprayed together with foliar fertilizers such as boron, zinc and other trace elements and foliar potassium fertilizer (such as Gaoneng Hongjia), the effect is even better. The effects and number of sprays at different stages are as follows:

1. Application at the seedling stage: The cotton seedling stage has many rainy days, low temperature, high humidity and many diseases, which is not conducive to strong seedlings and early development. Spraying Shuofeng 481 1 to 2 times can improve the low-temperature resistance at the seedling stage, promote root growth, reduce the occurrence of diseases such as damping-off, help strong seedlings and early development, and can also promote flower bud differentiation, strive for more buds and strong buds, and increase pre-summer bolls, laying the foundation for high yield.

2. Application at the bud stage: Spraying Shuofeng 481 at the bud stage can promote the growth and development of buds and the growth of cotton plants, but the southern cotton region is in the plum rain season at this time, with high temperature and high humidity, and cotton is prone to excessive growth. Therefore, it is generally not suitable to spray Shuofeng 481 again, so as to avoid excessive vegetative growth. However, for cotton fields with weak early growth or well-controlled plant shape, it can also be sprayed once.

3. Application at the flowering and boll stage: The flowering and boll stage is the most vigorous period of vegetative growth and reproductive growth of cotton, and also the key period for yield formation. Vegetative growth and reproductive growth compete fiercely, and at this time the southern cotton region enters a period of high temperature and drought, which easily leads to shedding of buds and bolls. Spraying Shuofeng 481 can increase the level of hormone growth in cotton plants, increase photosynthesis, promote the production of assimilates and their transport to buds and bolls, increase pollen activity, promote normal fertilization, improve the ability of cotton to resist high temperature and drought, reduce physiological shedding of buds and bolls, and promote the growth and development of young bolls. Generally, spraying 2 to 4 times has an obvious yield-increasing effect.

4. Application at the boll-opening stage: The boll-opening stage is the key period that determines boll weight and fiber quality, and at this time the temperature begins to drop, the absorption capacity of the root system gradually weakens, and vegetative growth gradually declines. Spraying Shuofeng 481 can prevent premature senescence, maintain a relatively high photosynthetic capacity, promote the transport of nutrients to cotton bolls, increase boll weight and lint percentage, increase the number of autumn bolls and prevent rotten bolls. Generally, it can be sprayed 3 to 4 times.