Abstract:

In order to assess the effects of meteorological factors on cotton fiber quality in the middle and southern area of HeBei Province, a field experiment with Lumianyan27hao was conducted in Nangong,Xinji and Baoding. The result showed that the difference of fiber strength, 2.5% fiber length and micronaire value reached significant level (p<0.05) in different ecological areas and different flower stage. There was significant difference in elongation rate between cotton bolls of different flower stage. There were significant correlation between meteorological factors of daily mean temperature, daily temperature difference, daily minimum temperature, daily maximum temperature and relative humidity and fiber strength and between elongation rate and average sunshine hours and the mean relative humidity. Micronaire value was negatively correlated with the daily range of temperature and the mean relative humidity, whereas daily maximum temperatures exhibit a positive correlation with micronaire value. With polynomial fit method, the experimental relationships between cotton fiber qualities with the most influential meteorological factors were obtained. it indicated that, when the daily mean temperature during boll maturation period was in the range of 25℃to 26℃,the fiber strength were better, when average sunshine time was in the range of 6.5 to 7 hours, the value of cotton fiber elongation rate was bigger, the optimal daily mean maximum temperature affecting micronaire value was 27-28℃ or 30-31℃. Meanwhile, the dynamic regression model between meteorological factors and fiber quality traits was built. These results would provide the references for ecological division and ecological model of fiber quality.