Studies on nitrate reductase activity and nitrogen response in crop plants III. The relation of nitrate reductase activity with characters of cultivar in the succession of rice cultivated in northern China
1988
Li Haozhe | Cui Xiongfan | Cui Mingzi (Yanbian Prefectural Inst. of Agricultural Sciences, Jilin (China)) | Lin Zhenwu | Tang Yuwei
The present study on 17 rice cultivars, which were cultivated in Northern China from early of this century to today, indicated that: (1). The characters of cultivars had been changed obviously in the succession of rice, showing a tendancy from big-ear and tall stalk to multiple-ears and short-stalk. (2). The general trend of nitrogen response of cultivars varied towards the cultivars suitable for higher level of nitrogen fertilizer. In reverse, the nitrate reductase activity of cultivars varied towards lower level, resulting in a close relation with nitrogen response. In general, the cultivars in early period exhibited a big ear and tall stalk, higher nitrate reductase activity, sensitive to lodging and suitable for lower level of nitrogen fertilizer. The cultivars in late period exhibited multiple ears and a short stalk, lower nitrate reductase activity, resistant to lodging and suitable for higher level of nitrogen fertilizers. The further analysis revealed a significant negative correlation of nitrate reductase activity with the ears/m2 of cultivar and a significant positive correlation of nitrate reductase activity with the height of stalk of cultivar.
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