Cotton is a warm-light crop. Under suitable conditions, the main stem can continue to grow upwards, so that vegetative growth and reproductive growth continue. This is the infinite growth habit of cotton. Due to this habit, such cotton crop fertilization with other different requirements more times, the number of suitable, accurate time. Rational fertilization can promote the completion of high-energy groups, to achieve cotton metabolic function exuberant period, the peak release fertilizer, according to local rich resources of light and temperature Triples step. High-yield cotton fields must be exchanged for high output with high input. Fertilizer management must focus on the principle of â€œearly, stable, sufficient, and longâ€. On the basis of cultivating strong seedlings, it is suitable to apply farmyard manure, replenish fertilizer, and apply flower and bell fertilizer. Pu Shi cover top fertilizer, increase the application of long peach fertilizer. Summarized as "the bottom of the fat foot, the seedlings are light, heavy flower bells, make up the top."
The inorganic nutrient content and content of cotton plants are affected by the climate, soil, cultivation techniques, etc.; after the cotton is budded, it enters the period of vegetative growth and reproductive growth, which requires both high-yield shelves and reproductive growth. Coordination in order to capture high quality and high yield. Therefore bud fertilizer to master a "stable" word, in order to facilitate long stable cotton plants. At that time, if the fertility is poor and the fertilization is insufficient, the cotton plant is small, the leaf area is small, the bud is small, and the tail is also easy to pull off. If too much fertilizer, plus the rainy season, very easy to cause flourishing, excessive consumption of carbohydrates affect the growth. At the same time, the ventilation and light transmission is insufficient, the shedding rate is increased, and the lower part is less peach, forming a long-lasting appearance of the upper hollow. Practice has proved that the bud fertilizer should avoid the so-called "three-face" of the fat and water, and the natural growth of the cotton plant. To this end, the amount of fertilizer and the period of fertilization should be determined according to the climate, seedlings and fertilization types at that time. Fertilization of the fat should have a full role for the effectiveness of the principle in full bloom boll. Generally, early-onset seedlings are applied early, and delayed seedlings are delayed; weak seedlings should be early, and Wang Miao should be late; drought should be early, and rain should be late; late-effect fertilizer should be early, and quick-acting fertilizer should be late. Deep application of fertilizer may be appropriate to facilitate root growth, and lasting fertilizer. Pay attention to avoid the release of nutrients too fast in hot and rainy days, leading to prosperous and early flowering.
The flowering and boll period is a period from vegetative growth to reproductive growth. At this time, the temperature is high and the light is sufficient to facilitate flowering and ringing. At this time, a lot of nutrients are needed, which is also the maximum efficiency period of nitrogen. The assimilation products of the leaves during the bolling period are mainly transported to the boll. Thus by the administration of boll fertilizer, can increase the leaf nitrogen content, extend the function of leaves, can be grown more assimilates, not only help to improve root activity, but also conducive to achieve high yield. The application amount of flower bell fertilizer is generally 20~30 kg per mu of ferric nitrate (potassium) fertilizer . It is advisable to apply 1~3 peaches at the base of the whole field , about 10~15 days after the general flowering . Because at this time, the flow of organic nutrients in the cotton plant has shifted from the supply top to the cotton boll, which does not cause excessive nutrient growth. For those cotton fields that have not yet been put on the peach, they will be lightly applied before and after seeing the flowers. After the peaches are placed, the flowers and bells will be applied again. The buds have used more quick-acting fertilizers or decomposed cakes. Exuberant, still need to apply flower ring fertilizer, the application period can be postponed appropriately. Boll fertilizer generally should not be later than the end of July, otherwise it will cause excessive vegetative growth of so-called secondary growth; thus lead to greed green late maturity, affect the reproductive growth.
Comprehensive data and production practices have proved that cotton is a nitrogen-nitrogen crop, whose yield is affected by soil nitrate nitrogen content, and the quality is affected by the ratio of nitrogen to phosphorus (nitrogen-phosphorus ratio is 2 : 1~1.4 ), while phosphorus nitrate ( The nitrogen form and the ratio of nitrogen to phosphorus in potassium fertilizer are in line with the fertilizer requirement characteristics of cotton. Phosphorus is required in cotton throughout life, and 10 to 25 days after emergence and flowering and bolling stage are the nutrient critical period of phosphorus, and considerable phosphorus is required in 60 days after flowering ( 65% ). At present, the traditional phosphorus-containing fertilizer is mainly used as the base fertilizer, and the amount of phosphorus fixation and degradation is increased on the alkaline soil. Using conventional nitrogen fertilizer, ammonium bicarbonate decompose easily due, labor intensive, easily causing cotton while ammonia poisoning; and urea is converted to ammonium nitrogen required in order to be absorbed in the cotton action of urease, not easy to master in time of application, At the same time, the amount of fertilizer applied, the proportion of fertilization and the uniformity of fertilization are also difficult to grasp. The excellent performance of phosphorus nitrate (potassium) fertilizer is consistent with the nitrogen and phosphorus nutrient conditions required for high quality and high yield of cotton. The rare earth nitrate in fertilizer plays a role in promoting and coordinating the growth of cotton. The nitrogen and phosphorus nutrients in an emergency are in line with cotton. The principle of â€œearly, stable, full, and longâ€ is required for fertilizer. Whether it is base fertilizer or top dressing, it cannot be compared with any other traditional fertilizer.In order to prevent premature aging of cotton, Strive for multi-ringing, generally about 1 kg of pure nitrogen per acre before and after the beginning of autumn . Fertilization period is generally no later than August 15, too late to prevent fertilization cause Greedy and late. If the pre-fertilization in the early stage is timely, and the cotton plant appears to have premature aging, it is not necessary to apply the topping fertilizer. In short, we must look at the soil, see the seedlings and fertilize, and be flexible.
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