Effect of panicle nitrogen on grain filling characteristics of high-yielding rice cultivars |
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| Institution: | 1. Key Laboratory of Crop Physiology, Ecology and Production Management, Ministry of Agriculture, Nanjing Agriculture University, Nanjing 210095, PR China;2. Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, PR China;1. National Engineering and Technology Center for Information Agriculture/Key Laboratory of Crop Physiology and Ecology in Southern China/ Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing 210095, China;2. Jiangsu Yanjiang Institute of Agricultural Sciences, Rugao 226541, China;1. Division of Agronomy and Horticulture Science, Graduate School of Agriculture, Kyoto University, Kyoto, Japan;2. Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China;3. Department of Agronomy, Graduate School of Science, Tohoku University, Sendai, Japan;1. Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha, China;2. Agronomy Department, Faculty of Agriculture, Assiut University, Assiut, Egypt |
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| Abstract: | The effects of four levels of panicle nitrogen fertilizer on the grain filling characteristics of three rice (Oryza sativa L.) varieties (super japonica rice Ningjing 3, three-line japonica hybrid rice Changyou 3 and three-line indica–japonica hybrid rice Yongyou 12) were analyzed. The results showed that difference in time of maximum filling rate (Tmax) was the smallest between the superior and inferior spikelets of Ningjing 3, bigger between those of Changyou 3, the biggest between those of Yongyou 12. Ningjing 3 was of the synchronous grain-filling type, Yongyou 12 the asynchronous type, and the Changyou 3 the medium type. The grain filling rate, the initial filling power (R0), the maximum filling rate (Gmax), and the average filling rate (G) of the superior and inferior spikelets of the three varieties under the treatment of panicle N with the amount of 120 kg ha?1 (middle panicle N, shortened as NM) treatment were higher than those of other treatments. NM treatment led to the highest increase in grain weight at the middle stage of filling for all the three varieties. The treatment shortened the early and late stages of grain filling, but extended the middle stage when the filling rate was the highest. However, the middle stage of grain filling of Changyou 3 and Yongyou 12 was much more extended than that of Ningjing 3, indicating a better effect of N on hybrid rice varieties. |
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| Keywords: | Rice varieties Different genotypes Panicle nitrogen fertilizer Grain filling characteristics |
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