In the management of cotton seedlings, it is necessary to highlight the use of topdressing as a remedy, attach importance to top-dressing at the seedling stage, apply early seedlings, and promote early emergence of cotton seedlings. Why should we put special emphasis on the application of cotton seedlings? The reasons are as follows: The first is that the cotton seedling stage is the period with the highest nitrogen content in each growth period, and the nitrogen metabolism is the most active. The nitrogen content in this section is more than 3.3%, which is higher than the other fertility stages. The second is the growth rate of the main root of cotton seedlings, which is 4-5 times faster than the young shoots on the ground. After the first true leaf of cotton is developed, the nutrients stored in the cotyledons are basically used up. If the fertilizer supply is insufficient, the extension of the main root and the development of lateral roots will be inhibited. In production, it is necessary to “strengthen the seedlings first to build a strong root and to develop a deep rooted seedling.†Third, the temperature of cotton at the seedling stage is relatively low, with less light, more rain, more soil moisture, poor permeability, microbial activity is blocked, the organic matter decomposition of cotton fields and the release of nutrients is slowed down, if the dressing is late and less, it is not easy to be cotton absorb. Fourth, there is not enough stamina in cotton field soil, the soil organic matter content shows a downward trend, and the storage fertilizer and fertilizer supply capacity are weakened. Fifth, some cotton fields are extensively cultivated, and the amount of base fertilizer applied is not large, and it is applied to the surface of the soil. After the rain, the loss of nutrients is more. Sixth, the application of good seedling fertilizer, one can increase cotton seedlings coefficient, two can increase the number of real leaves, three can increase the true leaf area to increase photosynthetic efficiency, four can accelerate the birth process. According to the research of the agricultural scientific research department, after three true leaves appear in the cotton, the flower buds begin to differentiate. Applying the seedlings can promote early-onset early-onset growth, allowing flower buds to differentiate earlier, and then lead to early budding, early flowering, premature peach growth and early harvest. The following improvements should be made in the top-dressing techniques of cotton: First, the seedlings must be planted on a seedbed before transplanting. Sending marrying manureâ€, after the transplanting, early harvesting of Miao Fei. The second is to change the application of slow-acting fertilizer as quick-effect fertilizer, promote the application of ammonium bicarbonate and urea, after the fixed seedlings should be top-dressed twice, 3-4 true leaves when chasing the first time, per acre ammonium bicarbonate 8-9 kg or urea 3-3.5 kg. When 6-7 true leaves are chased once, 15 kg of ammonium bicarbonate or 5 kg of urea is applied per mu. The application of base fertilizer at the cotton field can be reduced as appropriate. The third is to change the appropriation, shallow implementation of the ditch or play deep, to reduce fertilizer loss. The fourth is to dry water after the application of facilities for water to adjust fertilizer. According to the determination, the content of available nitrogen in the soil not treated with nitrogen fertilizer at the seedling stage of cotton was 17.5PPM, and the content of available nitrogen in the soil after watering was 25PPM, an increase of 7.5PPM, and the effect was significant.
The difference between the taste of purple Onion and yellow onion
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Purple onions and yellow onions also have a big difference in taste. Purple onions have a lighter spicy taste and a slightly sweet taste. They can be eaten raw, but the yellow onions are particularly spicy. They cannot be eaten raw and are suitable for frying. Eat after making or making soup. In addition, the purple onion has relatively thick flesh and high juice content, while the yellow onion has very thin flesh quality and low juice content.