Key cotton cultivation measures

Based on the investigation and analysis of cotton production in recent years, the author concluded a set of cultivation management models suitable for the middle and south cotton districts of Pucheng, namely: April seedlings, May Lei, June flowers, July flowers, August , tenderness in September, autumn peach top, at the end of October. Through three years (06,07,08), 6 consecutive demonstrations of 5,256 mu were used to obtain a gratifying yield of 346.1 kg of yield-producing seed cotton. The yield per mu reached 1,827.40 yuan (average price of 3.28 yuan/kg for 3 years), and the production increased year-on-year ( 283 kg/mu 22.3%, value added 333.20 yuan. Mu reduces costs by 62.86 yuan. The accumulatively increased section of Mu has a capital increase of 396.06 yuan, a total value of more than 2.1 million yuan, and the effect is excellent.

I. Key technical measures

1. In April, the seedlings require more than 15% soil moisture in the plough layer. Whether they use mulching, open cultivation or artificial water-feeding, whether sowing date will be sooner or later, or seedling replenishment, they must be obtained before the end of April. Comprehensive, large-plant variety, 2000-2300 mu per plant, 2500-2800 per mu plant, 3000-3500 per mu plant, and no disease or insect pests. Red and green stems account for about 50% respectively. Plants have more than two true leaves.

2. In May, Lei Lei grasped the whole seedlings and obtained the strong seedlings. Based on the abundance of the base fertilizer and the seedlings' appearance, the topdressing nitrogen of 3-5 kg ​​was properly applied, and fine water irrigation was conducted for the soil moisture and after the childbirth. Timely shallow ploughing, soil conservation, and promote the healthy growth of cotton seedlings. At the same time, spray 400 times rich potassium every 7-10 days, more than 2 times in a row, and add insecticides (cotton blind locust, cotton locust, etc.) sterilization (wilting, leaf spot, etc.) agent to prevent pests and diseases. More than 80% of plants began to bud before the end of May.

3. June Flower This month is not only a busy period for the “three summers” but also a critical period for the rapid growth of cotton. It is of utmost importance to do a good job in cotton management during this period. In the specific application, the key is to do a good job spray fertilizer (400 times rich million potassium plus 1% urea plus 0.2% Sonic boron, etc.) spray (insecticide fungicides) work, every 7-10 days, even spray 2 - 3 times. And for the flexible growth of cotton plant growth management, that is, daily increase of up to 3 cm above, combined with spray fertilizer (medicine) mu with pure product dilute amine 2 grams control 1 time, with mu added 0.1 kg of zinc sulfate and 0.2% speed Le boron, play a heat-resistant, promote sitting flowers into peach, reduce buds off, so that 40-50% of cotton plants before the end of the month to see the open flowers.

4. In July, Bao Lei Ling is the key period for vegetative growth and reproductive growth of cotton at the end of July. It is also the critical period for the transformation of carbon and nitrogen in the body and the demand for various biological enzymes and trace elements. Focus on prevention and control of pests and diseases, timely (to overcome the traditional practice of the 6th month of the lunar calendar and the wrong practice of long-term high-low play) topping (15-17 single large plant-type cultivars, 13-15 medium-sized cultivars, small On the basis of 12-13 plant varieties, about 10-12 kilograms of urea was used for the growth of cotton fields on July 10 (13 in the Zhuangshao field, and weak in the plants) and 13-15 kilograms in diammonium. Potassium chloride 15 kg, both to meet the needs of the development of buds, flowers, and bells, but also can effectively prevent the formation of abscisic acid in cotton plants, to prevent premature declining due to defertilization. At the same time, appropriate removal of some groups of tips for the growth of cotton plants is based on the principle that cotton fields can be seen on July 20-23. Otherwise, the ground is seen as the cotton plants grow too weak or the plant spacing is too wide, or the plant spacing is too narrow (or early) Excessive nitrogen fertilizer is not conducive to the formation of buds, flowers, and bells, and it also easily leads to shedding of a large number of budding bells. In addition, it is best to water in the “three volts” days at night, especially in well irrigation areas where the temperature difference between groundwater and cotton fields is large (above 30° C.). After irrigation, a large number of buds and bells can easily fall off. Canal water should also be irrigated after 4 pm and before 10 am. At the same time, the upper part of the ground continues to spray 400 times richer potassium for 1-2 times, and the effect is better.

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