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Table of Content

    10 June 1987, Volume 08 Issue 02
    论文
    A STUDY ON THE COTTON BOLL DEVELOPMENT WITH THE CLIMATIC CONDITIONS
    Zhang Shuling Tang Yaosheng (Cotton Research Institute of the Chinese Academy of Agricultural Sciences)
    1987, 08(02):  40549-405. 
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    A comprehensive study on the system between the boll development and the climatic conditions for seyeral years show that a preliminary result of the specific heat unit index relative to economic characteristics of the cotton bolls has been obtained. The active accumulated temperature≥15℃ between 1,300—1,500 degree-day is the accumulated temperature index for boll opening under normal conditions. The accumulated temperature for boll opening under normal conditions should be not less than 1,100 degree-day. There is a highly negative correlation between boll setting period and the average daily temperature within the boll setting period with r=-0.9087. The lowest critical temperature for boll opening unclef normal conditions is at 15℃. There is a significant correlation between seed cotton percentage/boll ard the days≥18℃ within the 50 days boll development and the accumulated temperature durirg this period. The lowest critical index for the seed cotton percentage/boll is in 35 days and 800 degree-day. Under the conditions with the average temperature less that 20℃, the percent of matured seeds is no morethan 30%. The fiber quality is closely correlated with the early or late advent of the flowering period and with the water, heat unit and the sunshine. The effective flowering period is Often stopped on August 20 for cottons grown in Anyang. Based on this, it must rely on the bolls set in the mid summer, obtain bolls set in early autumn as many as possible and decrease the percent of autumn bolls in the rank of mid summer bolls, early autumn bolls and autumn bolls as far as possible.
    A STUDY ON RELATIONSHIP BETWEEN QUALITY OF CURED TOBACCO AND CLIMATE IN GUIZHOU PROVINCE
    Yang Shuliang Huang Zhaoyu (Meteorological Bureau of Guizbou province) Tang Yuanju Wang Yuping (Tobacco Institute of Guizhou Province)
    1987, 08(02):  40734-407. 
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    In this paper, the relationships between quality of cured tobacco and weather element is discussed and analysed, by using gradual regression analysis on the data of experiment of cured tobaeco and synchronism meteorological observation in Guizhou Plateau from 1981 to 1984 year. The result shows that the temperatttre in the ripening stage and the,continuous days above 20℃ in the whole period of field growth are the most important weather elements, and the clear quantitive relation exists in the weather element and the quality of cured tobacco.
    A PRELIMINARY STUDY OF INSUFFICIENT ILLUMINATION DURING THE GRAIN-FILLING AND FRUIT STAGE OF RICE
    Li Lin Sha Guodong (Jiangsu Academy of Agricultural Sciences, Agronmeteorology Lab)
    1987, 08(02):  40863-408. 
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    The insufficient illumination effect during the grain—filling stage has been studied. For early rice, the insufficient illumination effect oceured about 5 times per ten years in Jiangsu Province, and for middle and late rice, about 4 to 5 times per ten years. When rice crops were suffering from the insufficient illumination effect, the ratio of earbohydrates to nitrogen in riee plants failed inbalance. The chlorophyll (a+b) content in rice leaves decreased, and the photosynthetic rate declined. As a result, both the fertility and grain weight of paddy dropped. However, the tolerance of insufficient illumination in different varieties, were different, Under insufficient illumination effect, the content of soluble sugar and starch in Indiea rice decreased more rapidly than that in Japonica rice. The increase of nitrogen content in the two varietal types difference was not significant. The reduction of chlorophyll content in flag leaves, the decrease of fruit and grain weight were considerably different among varieties. The insufficient illumination tolerance of rice plants was also effected obviously, by the nitrogen application rate and combination of fertilizers.