Responses Of Cotton Varieties With Different Maturity To Sowing Date In Morphology And Main Physiological Characters

This experiment was conducted to study the responses of organ growth and development and physiological characters to varieties of different maturity with different sowing dates in cotton. There were two cotton varieties CCRI 30 (early maturity variety) and CCRI 41 (middle maturity variety) were used. The results of this study will be useful to setting up the mechannical simulation model of cotton growth and development.The results were as followed as: the Logistic recursive equation was used in the height of stem, the height decreased with the delay of sowing date. The greatest efficiency of accumulated temperature of CCRI 30 was 0.0592cm C-1' in the second sowing date of rapid growth period, the lowest of that was 0.0481cm C-1 in the third sowing date .To CCRI 41,the highest of the efficiency of accumulated temperature was 0.0818 cm C-1 in the third sowing date of rapid growth period, the lowest of that was 0.0654cm C-1 in the first sowing date .The linearity recursive equation was used in the rate of leaf emergence, and the y=ax2+bx+c recursive equation was used in the leaf area. The rate of leaf emergence and coefficient of leaf emergence of the two varities were the largest in the second sowing date, the smallest were in the third sowing date. The response of the quantity of bud and boll of CCRI 30 was sensitive in different sowing dates, but that of CCRI 41 was not.Accumulation dry matter of nutritional organ can use Logistic recusive equation to bewrite. The efficiency of cumulated temperature in accumulating of dry matter of stem and twig in the second sowing date' rapid growth period was the greatest, CCRI 30's was 0.030g C-1, CCRI 41's was 0.039g C-1 In the course of accumulating of dry matter of leaf, the trend was similar to that of stem and twig, CCRI 30's was 0.0352g C-1, CCRI 41's was 0.0335g C-1. the accumulating of dry matter of bud had no rules, but that of boll can use linearity recusive equation to bewrite. The speed of accumulation of bud in CCRI 30 was hightest in the third sowing date. The accumulation of dry matter of bud of CCRI 41 was more in the first and second sowing dates than that in the third sowing date. The accumulation of dry matter of boll of CCRI 30 was similar between the first and second sowing date, and that of the third sowing date was less. For CCRI 41, the accumulation of dry matter of boll was highest in the second sowing date.As to the allocation of dry matter of three sowing dates, the percent of stem and twig of the two varieties decreased with the delay of sowing date. The speed descend with the delayingof sowing date of CCRI41 was bigger than that of CCRI30. The percent of leaf of CCRI30 was the fewest in the first sowing date, and was the largest in the second sowing date. The percent of leaf of CCRI41 reduced with the delaying of sowing date. The percentage of allocated dry matter of reproductive organ of CCRI 30 was similar in three sowing dates. The percent of stem and twig of CCRI 41 decreased with the delaying of sowing date.On the aspect of physiological property, the chlorophyll and carotenoid content infunction leaves of CCRI41 was higher than that of CCRI30 in three sowing dates. There werethe most content of those chemichales in bud period. The net photosynthetic rate showed littledifference in function leaves between the two varieties. The analyze about photosyntheticphysiology was that there were advantage in the second sowing date in both varieties, this canoffer feasibility for produce more organic compound. On the analyze of nitrogen metabolize,nitrogen content in function of CCRI41 had higher than that of CCRI30, especially in the thirdsowing date. Among three sowing dates, the period of the most nitrogen content was precedinganthesis. The soluble protein in function leaves in two varieties had little difference in prophaseand metaphase of cotton growth period, but in anaphase of cotton growth period, CCRI41's washigher than CCRDO's. The period of the most content was bud period. To the analysis of carbonmetabolize,...