Nitrogen acquisition and its relation to growth and yield in recent high-yielding cultivars of rice (Oryza sativa L.) in Japan
| Autor: | Tadahiko Mae |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Soil Science and Plant Nutrition. 57:625-635 |
| ISSN: | 1747-0765 0038-0768 |
| Popis: | During the last two decades, high-yielding cultivars for multipurpose use of rice have been bred and released in Japan. Some of them have repeatedly recorded high yields of over 9 t ha−1 of brown rice (about 11.25 t ha−1 of rough rice). Here, characteristic features of nitrogen (N) acquisition and its relation to formation of yield components, dry matter production and grain yield at yield levels over 9 t ha−1 of brown rice in recent high-yielding cultivars, a large grain type of japonica variety, “Akita 63,” extra-panicle weight types of indica variety, “Takanari” and “Saikai 198,” and a panicle weight type of japonica variety, “Fukuhibiki,” are described as compared with those in the standard japonica cultivars, “Toyonishiki” and “Nipponbare.” The grain yield of the recent high-yielding cultivars was 9.4 to 11.6 t ha−1 of brown rice; that is 1.2−1.7 times greater than those of the standard cultivars. Sink capacity (1000-grain weight × spikelet number per unit land area) was 47−62% greater in the recent ... |
| Databáze: | OpenAIRE |
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