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保加利亚棉花生产发展与改进棉花品种的早熟性关系十分密切。棉花早熟能保证获得高产稳产;同时也有利于棉花机械化收获和后作、1972年A·Low曾强调指出:棉花早熟性问题是摆在棉花生期有效总积温不超过4500℃;的国家一个问题。尤其是保加利亚在棉花生育期有效总积温仅3567℃;因此,选育棉花早熟品种具有首要意义。保加利亚对棉花要求选育早熟、抗寒,高产(单产45—50公担/公顷)纤维长度30—31mm,衣分为35％,适宜机械化收获,抗棉花黄、枯萎病等优良品种。棉花品种的抗寒性,其指标是相对的。它要求在较低的温度条件下,棉花能正常生育,生长期有效总积温在3200℃上下能正常吐絮。
The development of cotton production in Bulgaria is closely related to improving the precocity of cotton varieties. Premature cotton can ensure high and stable yield; also conducive to the harvest of cotton mechanization and after the 1972 A • Low has stressed that: cotton precocity is placed in the cotton total effective life does not exceed the total accumulated temperature of 4500 ℃; a problem . In particular, the effective total accumulated temperature in Bulgaria during the growth period of cotton is only 3567 ° C; therefore, it is of primary importance to breed precocious varieties of cotton. Bulgaria requires the breeding of cotton precocious, cold, high yield (yield 45-50 km / ha) fiber length 30-31mm, clothing is divided into 35%, suitable for mechanized harvest, resistance to cotton yellow, blight and other fine varieties. The cold resistance of cotton varieties, the index is relative. It requires the lower temperature conditions, the cotton can be normal fertility, the effective growth of the total accumulated temperature at 3200 ℃ up and down normal vomit.