Demian 206: a New Hybrid Cotton Variety with High quality

In recent years, with the rapid development of the textile industry, the consumption and market demand of cotton are increasing, and the smile on the faces of cotton farmers is also particularly brilliant. For cotton farmers, how to choose excellent cotton varieties is very important. Those cotton varieties with high yield, large peach bearing, strong disease resistance and smooth bolting are usually their first choice. The following is to introduce an improved variety of cotton-Demian 206, which has many advantages above.

Outstanding heterosis

Demian 206 is not only a new hybrid cotton variety with high quality, high yield and multi-resistance, but also a kind of insect-resistant cotton. It was selected by Nongzheng seed Industry Cotton Research Institute in 2000. it has the advantages of high yield and multi-resistance of female parent disease-resistant line 205 and male parent high-quality multi-resistance M3021. In 2003, he took part in the regional test of hybrid cotton in Hubei Province and Anhui Province, and showed strong heterosis of hybrid varieties. Demian 206 participated in the regional experiment and demonstration of hybrid cotton in Hubei Province in 2003, which showed outstanding high yield, resistance to Fusarium wilt and resistance to Verticillium wilt. Its growth period is about 137 days, and the yield of seed cotton per mu is about 280 kg ~ 394 kg, which is 39% higher than that of Zhongmian 29, and the effect of increasing yield is extremely significant. the yield of seed cotton before frost is 224 kg, which is 29.6% higher than that of the control. In the process of demonstration planting in various regions of Hubei, the yield is higher than that of the main local varieties, can withstand the test of disaster weather, and is deeply liked by farmers. In the regional test of hybrid cotton in Anhui Province, it also showed a strong advantage of increasing yield, and the final result ranked first among the tested combinations.

Characteristic characteristic

Demian 206plants are tower-shaped, with a height of about 129.5 cm, fruit branches of about 20.4cm, 42 ~ 48 bolls per plant, and a yield of more than 120kg per mu, which is significantly higher than that of the control. Demian 206 has wide adaptability, high yield and good yield stability. it has strong resistance to cotton bollworm and red bollworm, as well as Fusarium wilt and Verticillium wilt. Demian 206 has wide adaptability, stain resistance, high temperature resistance and strong stress resistance. In the 2003 regional test, the field was waterlogged due to continuous rainstorm, but the average plant death rate of Demian 206 was only 0.9%, which was the lowest among 20 combinations of the same variety. In the later stage, when the high temperature lasted for 39 ℃, most northern varieties showed pollen abortion and bud and boll shedding, but Demian 206showed no boll emptiness in the middle, showing strong disaster resistance. And it is suitable for planting in a wide area, and its performance is outstanding in each district.

Cultivation techniques

Demian 206 generally chooses to sow and raise seedlings in a clear nutrition bowl in the first and middle of April and transplant in the first ten days of May. It has strong growth potential in the early stage and great production potential per plant, so it should be sparsely planted properly, and the field density of cotton field should be controlled at 1500 ~ 1600 plants per mu, in order to give full play to the characteristics of varieties and obtain high yield, and at the same time, fertilizer and water management should be strengthened. Mainly pay attention to the "three passes" of base fertilizer, flower and boll fertilizer and cap fertilizer, and increase the application of organic fertilizer, phosphate fertilizer, potash fertilizer and boron fertilizer. The amount of potash fertilizer should be increased appropriately during the flowering and boll period, and 25 kilograms of potassium chloride is generally required. In addition, soil cultivation combined with mid-tillage can have the effect of anti-lodging, water filtration and disease prevention. During planting, attention should be paid to the control of cotton aphids, red spiders and bug bugs. Insect-resistant cotton is not insect-free cotton, attention should be paid to the use of drugs to control insect pests when reaching the control target.

Related links

Insect-resistant cotton: BT (Bacillus thuringiensis) gene and CTPI gene (trypsin inhibitor gene) were transferred to popularized varieties by biotechnology, and a number of cotton varieties and hybrid combinations resistant to Helicoverpa armigera and red bollworm were bred. These varieties and combinations are called insect-resistant cotton, also known as BT cotton. The reason why BT cotton is resistant to insects is that after the foreign gene is transferred into the cotton plant, a parasporal crystal called δ endotoxin, which is a protein, is synthesized in the cotton plant. The intact parasporal crystals are non-toxic. After being fed by Lepidoptera insects, the parasporal crystals are recognized and combined with the special receptors of intestinal epithelial cells under the alkaline condition of the intestine. under the catalysis of enzymes, parasporal crystals are hydrolyzed into toxic peptides. Toxicity forms micropores in the insect midgut epithelial cells, intracellular ions and organic leakage, water outflow, cell expansion and rupture, so that the larvae stop feeding, paralysis, and finally die.