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Articles by Yang Wen-Yu
Total Records ( 2 ) for Yang Wen-Yu
  Liu Wen-Jiang and Yang Wen-Yu
  For a better understanding of the effects of light-temperature factors on the grain yield and yield components in different latitude areas, we have done six field experiments in Shanxi Hanzhong, Sichuan Wenjiang, Yunnan Mile of China and Hanoi Wenlin, Zhongbu Guang’ai, Saigon Long’an of Vietnam from 2005-2006. The results showed as follows: there was real linear regression between seven light-temperature factors and grain yield. The size order of standard regression coefficient was: cumulateive illumination intensity >duration of day>average temperature>average illumination intensity>maximum temperature>effective accumulated temperature >minimum temperature. There was extremely significant negative correlation between average temperature and spike length while there was significant positive correlation between average illumination intensity and spike length. The partial correlation coefficient between average temperature and number of effective spikes per plant was bigger (r = 0.4576). Except for duration of day, the correlation between other light-temperature factors and number of effective spikes per plant was significant. The partial correlation coefficient between duration of day and grains per panicle, seed setting rate were bigger which was 0.3746, -0.5599, respectively. The partial correlation coefficient between minimum temperature and 1000 grain weight was bigger (r = -0.1897) but the correlation between all the light-temperature factors and 1000 grain weight was not significant.
  Yao Xiong , Li Jing-Yong , Ren Wan-Jun and Yang Wen-Yu
  In order to provide scientific theoretical basis for identifying the rice shade-endurance and develop the rice production of china. The effects of 50% shading in different breeding stage on root system, photosynthetic rate, the leaf area index and yield of rice were studied. Results showed that under shading stress, the growth of root system was inhibited, the photosynthetic rate, number of effective panicles, grains per panicle, filled grain per plant, seed setting rate, 1000 grain weight and grain yield decreased meanwhile, the leaf area index and number of sterile per seed increased. The biggest effect was shading in elongating-heading stage and then were shading in filling stage and tillering stage. Six indexes such as root vigor, root volume, root active absorbing area, photosynthetic rate of leaf, seed setting rate and grain yield, etc., could be taken as identification indexes of rice shade-endurance. By using integrated shade-endurance coefficient as evaluating index and rice shade-endurance could be divided into 3 grades. Among these varieties, the shade-endurance of 5 varieties such as Dyou158 and Dyou527, etc., were stronger, the shade-endurance of Gangyou906 and Yifeng8 were weaker.
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