Seedling release technique of Cotton covered with plastic Film
The temperature of the cotton field covered with plastic film was high, and the seedlings emerged quickly and evenly. The seedlings were sown until 8 days after emergence, and the seedlings could be completed 3 to 4 days after emergence. After the seedlings, if the late frost has passed, you should break the hole and release the seedlings.
Release seedlings too early. Can not complete the seedlings, the whole seedling, too late is not good for strong seedlings, in case of high temperature, often cause hot seedlings. Strip sowing should be drilled according to the plant, hole sowing, punching according to the seedling.
After breaking the film and releasing seedlings, bury the soil at the break to prevent moisture, cooling, strong wind and weed growth. When releasing seedlings, we should master to put green but not yellow, that is, cotton seedlings with flat cotyledons can be released, and unspreading yellow-petal seedlings are easy to be dried by the wind or die in the sun, and cannot break holes to release seedlings.
Seedling release time, cloudy days can be released throughout the day, sunny days should be after the morning dew dry and after three or four o'clock in the afternoon. When the sun shines at noon, it is easy to release seedlings.
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Root system of cotton
Cotton is native to tropical and subtropical regions and is a perennial plant. After long-term artificial selection and cultivation, it gradually moved northward to the temperate zone and evolved into an annual crop. Within a year, sowing, budding, flowering, boll setting, seed maturation, and completion of the growth cycle. In the process of growth and development, cotton still retains some characteristics of the original perennial crops and has unlimited growth habits. Under suitable conditions, fruit branches can constantly proliferate fruit branches, fruit nodes, buds, blossoms and bolls. Cotton is a straight root crop with developed root system, deep main root and wide distribution of lateral roots.
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A Single Recessive Photoperiod and Temperature Sensitive Genic Male Sterile Line Yahuang 396a in Cotton
1. The present situation and problems of breeding and seed production by using heterosis 1.1. The technique of artificial or chemical emasculation hybridization is simple, any two varieties can be parents of each other, anthesis emasculation and artificial pollination can be used, and chemical emasculation hybridization can also be used for seed production. The advantages are easy to make full use of existing variety resources, strong randomness of hybrid selection, free combination, and partial combination can use F2. Disadvantages are labor intensity, labor, high cost, F2 heterosis than F1 more decline. 1.2 cells
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