Demian 206 is a new high-quality hybrid cotton variety
In recent years, with the rapid development of the textile industry, cotton consumption and market demand have continued to grow, and the smiles on cotton farmers' faces have been especially bright. For cotton farmers, how to choose excellent cotton varieties is very important. Those cotton varieties with good yield performance, large bolls, strong disease resistance, and smooth boll opening are usually their first choice. Below is an introduction to a good cotton variety with the many advantages mentioned above - Demian 206.
Outstanding heterosis
Demian 206 is a new high-quality, high-yield, multi-resistant hybrid cotton variety, and it is also an insect-resistant cotton. It was bred in 2000 by the Cotton Research Institute of Nongzhengcheng Seed Industry, and has the advantages of high yield and multiple resistance from the female parent disease-resistant line 205 and the male parent high-quality multi-resistant M3021. In 2003, it participated in the Hubei Province hybrid cotton regional trial and the Anhui Province hybrid cotton regional trial, and both showed extremely strong hybrid variety advantages. In 2003, during the Hubei Province hybrid cotton regional experimental demonstrations, Demian 206 showed outstanding yield performance, resistance to Fusarium wilt, and relatively good tolerance to Verticillium wilt. Its growth period is about 137 days, and the seed cotton yield per mu is about 280 kg to 394 kg, an increase of 39% over the control Zhongmian 29, with an extremely significant yield increase effect. The pre-frost seed cotton was 224 kg, an increase of 29.6% over the control. During demonstration planting in various regions of Hubei, it increased yield compared with the main local planting varieties, was able to withstand the test of disastrous weather, and was deeply liked by farmers. In the Anhui Province hybrid cotton regional trial, it also showed an extremely strong yield-increasing advantage, and the final result ranked first among the participating combinations.
Characteristics
The Demian 206 plant is tower-shaped, with a plant height of about 129.5 cm, generally about 20.4 fruiting branches, 42 to 48 bolls per plant, and a general yield per mu of more than 120 kg, an extremely significant increase over the control. Demian 206 has wide adaptability, relatively high yield, and relatively good stable-yield performance. It has strong resistance to cotton bollworm and pink bollworm, and can also resist Fusarium wilt and Verticillium wilt. Demian 206 has wide adaptability, tolerance to waterlogging, tolerance to high temperature, and strong stress resistance. In the 2003 regional trial, due to continuous heavy rain that caused waterlogging in the field, the average dead plant rate of Demian 206 was only 0.9%, and its dead plant rate was the lowest among the 20 combinations of the same variety in the experiment. In the later period, with continuous high temperatures of 39°C, most northern varieties showed pollen abortion and shedding of squares and bolls, but Demian 206 did not show empty boll set in the middle part, demonstrating very strong disaster resistance. It is also suitable for a wide range of planting areas and performed outstandingly in all regions.
Cultivation techniques
Demian 206 is generally sown and raised in nutritious pots on sunny days in early to mid-April, and transplanted in early May. Its early growth vigor is strong, and the production potential per plant is large, so it should be appropriately sparsely planted. The field density of the cotton field should be controlled at 1500 to 1600 plants per mu, so as to give full play to the variety's characteristics and achieve high yield as much as possible. At the same time, fertilizer and water management also need to be strengthened. The main focus is on the "three passes" of base fertilizer, flowering and boll fertilizer, and topdressing fertilizer, with increased application of organic fertilizer, phosphate fertilizer, potassium fertilizer, and boron fertilizer. During the flowering and boll stage, the amount of potassium fertilizer should be appropriately increased, generally requiring 25 kg of potassium chloride. In addition, hilling soil in combination with intertillage can play a role in lodging resistance, drainage, and disease prevention. During the planting period, attention should be paid to controlling cotton aphids, red spider mites, and mirid bugs. Insect-resistant cotton is not insect-free cotton, and attention should be paid to applying pesticides to control pests when the control threshold is reached.
Related links
Insect-resistant cotton: Using biotechnology to transfer the BT (Bacillus thuringiensis) gene and the CTPI gene (trypsin inhibitor gene) into promoted varieties, a group of cotton varieties and hybrid combinations resistant to cotton bollworm and pink bollworm were bred. These varieties and combinations are called insect-resistant cotton, also known as BT cotton. The reason BT cotton is insect-resistant is that after the exogenous gene is transferred into the cotton plant, a parasporal crystal called delta-endotoxin is synthesized in the cotton plant body, and this crystal is a protein. The intact parasporal crystal is not toxic. When eaten by Lepidoptera insects, it is recognized and bound by special receptors on the midgut epithelial cells, and under the alkaline conditions of the intestine, through enzymatic catalysis, the parasporal crystal is hydrolyzed into toxic peptides. The toxin forms micropores on the midgut epithelial cells of the insect, ions and organic substances inside the cells leak out, water flows out, and the cells swell and rupture, causing the larvae to stop feeding, become paralyzed, and finally die.