Studies on the Effects on Main Agro- nomic and Economic Characters of Cotton in Different Ecology Spots

The study showed that the variation coefficients of micronaire and boll mumber per plant are the largest in the fiber quality and yield properties. By the interrelative methods of grey systematic theory, the fiber length is one of the significant factors that affects uniformation and gas yarn quality; the uniformation is one of the significant factors that affects fiber length and strength;the gas yarn quality is one of the significant factors that affects micronaire. More over, fiber length is the closest against the yield; Lint percentage is one of the significant factors that affects boll mumber per plant and seed cotton per plant and lint index; lint index is one of the significant factors that affects lint percentage ; seed cotton per plant is one of the significant factors that affects seed index. By restoring menstrual analyses, the direct action to the yield of fiber length and lint percentage is the largest; On the grounds of primary component analysis that boll mumber per plant, boll weight and lint percentage add up to 82. 66% of the gross information content under the condition of special e-cosystem and cultivation in Hunan. Fiber length, strength and micronaire add up to merely 66.89% of yield.