摘要
The experiments were carried out under solution and pot cultural conditions with rice Yang-dao6. Effect of nitrogen on hull size, weight and plumpness and its relationship with plant nutrition were analysed. On comparison with no fertilization, low N application concentration from transplanting to heading, or employing basal fertilizer or tiller promoting one would result in increment of hull size and weight, while raising N application concentration from transplanting to heading or employing excessive spike fertilizer would result in smaller, lighter hull and poorer hull plumpness. The more amount of nitrogen applied, the more hull development would be inhibited. Top dressing at heading would facilitate hull substance accumulation, but its effect on hull size was small. The variation of hull traits differed in the following order: hull weight>hull weight per unit area>hull area>hull length>hull width. Hull traits were highly significantly correlated to the nitrogen content of plant at heading, with correlation coefficient from - 0. 8684* * to - 0.9336 * * , and positively correlated to the contents of soluble sugar and starch at heading, with correlation coefficient of 0.6660NS - 0.9501 * * . Improving hull characters would be beneficial to substance accumulation of grain, thus improving grain weight considerably(r = 0.6388* - 0.9574* * ).
The experiments were carried out under solution and pot cultural conditions with rice Yang-dao6. Effect of nitrogen on hull size, weight and plumpness and its relationship with plant nutrition were analysed. On comparison with no fertilization, low N application concentration from transplanting to heading, or employing basal fertilizer or tiller promoting one would result in increment of hull size and weight, while raising N application concentration from transplanting to heading or employing excessive spike fertilizer would result in smaller, lighter hull and poorer hull plumpness. The more amount of nitrogen applied, the more hull development would be inhibited. Top dressing at heading would facilitate hull substance accumulation, but its effect on hull size was small. The variation of hull traits differed in the following order: hull weight>hull weight per unit area>hull area>hull length>hull width. Hull traits were highly significantly correlated to the nitrogen content of plant at heading, with correlation coefficient from - 0. 8684* * to - 0.9336 * * , and positively correlated to the contents of soluble sugar and starch at heading, with correlation coefficient of 0.6660NS - 0.9501 * * . Improving hull characters would be beneficial to substance accumulation of grain, thus improving grain weight considerably(r = 0.6388* - 0.9574* * ).
基金
supported by Jiangsu Provincial Natural Science Foundation(BJ99038).
