Effects of transplanting density, nitrogen （N） application quantity and potassium （K） application quantity on hybrid rice ＂Luyoumingzhan＂ were studied by optimal design. Regression models between yield, quality ...Effects of transplanting density, nitrogen （N） application quantity and potassium （K） application quantity on hybrid rice ＂Luyoumingzhan＂ were studied by optimal design. Regression models between yield, quality and the three cultivation measures were built to study the effects of the three cultivation measures on rice yield and quality. The results showed that the yield and quality were influenced in various degrees. An optimization measure for high yield and low chalky ratio was simulated by computer,which was 214500 clumps per ha, 140.2 kg N per ha and N 136.6 kg per ha.展开更多
Xiangxiang 2A has an evident drawback, i.e., instability in male sterility under higher temperature conditions resulting from the existence of minor restoring genes in it, which greatly hampered the extension of its e...Xiangxiang 2A has an evident drawback, i.e., instability in male sterility under higher temperature conditions resulting from the existence of minor restoring genes in it, which greatly hampered the extension of its elite hybrid Xiangyou 63 with both high yield and fine quality in commercial production. To improve Xiangxiang 2A, the hybridization of Xiangxiang 2B with V20 B was made again in 1990. A new aromatic CMS line Xinxiang A was successfully developed in 1994. It not only retains the favorable characteristics of Xiangxiang 2A in grain quality and combining ability, but also expresses complete and stable male sterility and high seed production yield potential. Up to now, by using it as female parent, a series of quasi aromatic hybrids have been developed. Some of them have been released to farmers. Because such hybrids can not only yield higher or as high as but also possess a better grain quality than the current common high yielding hybrid rice varieties,so that they are preferred and well welcome by the farmers in China. The planting area under these hybrids is increasing rapidly in China.展开更多
基金Supported by Key Project of Fujian Spark Program(2012S0048)Fujian Science and Technology Major Project(2012NZ0003-2)~~
文摘Effects of transplanting density, nitrogen （N） application quantity and potassium （K） application quantity on hybrid rice ＂Luyoumingzhan＂ were studied by optimal design. Regression models between yield, quality and the three cultivation measures were built to study the effects of the three cultivation measures on rice yield and quality. The results showed that the yield and quality were influenced in various degrees. An optimization measure for high yield and low chalky ratio was simulated by computer,which was 214500 clumps per ha, 140.2 kg N per ha and N 136.6 kg per ha.
文摘Xiangxiang 2A has an evident drawback, i.e., instability in male sterility under higher temperature conditions resulting from the existence of minor restoring genes in it, which greatly hampered the extension of its elite hybrid Xiangyou 63 with both high yield and fine quality in commercial production. To improve Xiangxiang 2A, the hybridization of Xiangxiang 2B with V20 B was made again in 1990. A new aromatic CMS line Xinxiang A was successfully developed in 1994. It not only retains the favorable characteristics of Xiangxiang 2A in grain quality and combining ability, but also expresses complete and stable male sterility and high seed production yield potential. Up to now, by using it as female parent, a series of quasi aromatic hybrids have been developed. Some of them have been released to farmers. Because such hybrids can not only yield higher or as high as but also possess a better grain quality than the current common high yielding hybrid rice varieties,so that they are preferred and well welcome by the farmers in China. The planting area under these hybrids is increasing rapidly in China.
