Summer sowing cotton-winter wheat double-late-sowing double-early-maturing directional breeding method

Abstract

The invention belongs to the technical field of cotton and wheat breeding, and discloses a summer sowing cotton-wheat double-late-sowing double-early-maturing directional breeding method, which comprises the following steps: sowing middle-early-maturing multi-ear high-quality wheat germplasm materials in November, screening parent materials with complementary character advantages, and hybridizing in April of the next year; excellent cotton germplasm is planted at the beginning of June, parent materials with complementary character advantages are screened from the excellent cotton germplasm for hybridization, and generation adding is conducted on the F1 generation in Hainan from October of the same year to March of the next year; directional selection is carried out, and a new variety which is suitable for summer sowing cotton-wheat rotation and resistant to late sowing and early maturing is cultivated. Based on the angle of breeding, late-sowing-resistant early-maturing high-quality wheat and a new high-yield and high-quality early-maturing cotton variety with close connection of crops for rotation and close combination of sowing periods are bred, annual crop breeding is coupled together, double cropping of a cotton field in one year is achieved, the land utilization rate is increased, and the land contention of cotton grains is effectively relieved. The method of shuttling breeding of cotton in local and Xinjiang and south propagation generation adding in Hainan effectively shortens the breeding period and improves the variety adaptability.

Description

technical field [0001] The invention belongs to the technical field of wheat and cotton breeding, in particular to a directional breeding method for summer sowing cotton-wheat double late sowing and double early maturity. Background technique [0002] The cotton area in the Yangtze River Basin is known for the cultivation and cultivation of hybrid cotton, and most of them are fallow in winter. There is only one season of output per year, and the cost of cotton planting is high, which reduces the benefit of cotton planting. The hybrid cotton planting process is cumbersome and the level of mechanization is low. Summer sowing cotton (early maturing cotton), short growth period, can be sown after wheat, semi-precision and precision mechanical sowing, reasonable dense planting, 60,000 plants / hm2 in the Yangtze River Basin, straw returning, chemical regulation, concentrated boll formation , the integration of technologies such as easy mechanical harvesting has been demonstrated i...

AI Technical Summary

Problems solved by technology

The planting process of hybrid cotton is cumbersome and the level of mechanization is low