Pot experiments were conducted to investigate the influence of Si fertilizer on yield and N-uptake and use efficiency of double-season rice under the conditions of equal nitrogen, phosphorus and potassium nutrients. T...
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Pot experiments were conducted to investigate the influence of Si fertilizer on yield and N-uptake and use efficiency of double-season rice under the conditions of equal nitrogen, phosphorus and potassium nutrients. The results showed that along with the increase of Si fertilizer application, the yield of early and late rice increased firstly and then decreased within the range of SiO2 application rate of 0-0.8 g/kg soil. There was a significant parabolic correlation between the amounts of Si fertilizer application and rice grain yield (r= 0.931 2 and r= 0.973 3 in early-and late-rice season, respectively). Results showed that efficient Si fertilizer application enchanced N contents in different plant components of early rice at maturity stages with increased nitrogen uptake of double cropping rice and nitrogen harvest index of late rice.
In this study, phenotypic, physiological and genetic characteristics of large grain rice line Igl were investigated. The results showed that Igl exhibited tall plants, long spikes and large grains, with a 1 000-grain ...
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In this study, phenotypic, physiological and genetic characteristics of large grain rice line Igl were investigated. The results showed that Igl exhibited tall plants, long spikes and large grains, with a 1 000-grain weight of 47.58 g. In addition, Igl had strong photosynthetic capacity, but the stomatal conductance-and intercellular CO2 concentration were 32.1% and 3.94% lower compared with 9311, respectively. Igl displayed synchronous grain filling, and there were no significant differences between the contribution rates of superior and inferior grains at the early, middle and late grain-filling stages, but the grain-filling duration of superior grains was longer than that of inferior grains. The genetic analysis indicated that grain length, grain width, length-width ratio, grain thickness and 1 000-grain weight of F2 population obeyed normal distribution, which were quantitative trait loci controlled by multiple genes. The correlation analysis showed that there was an extremely significant positive correlation between grain width and grain length; grain length, grain width and grain thickness exhibited extremely significant positive correlations with 1 000-grain weight and extremely significant negative correlations with length-width ratio, it might be concluded that grain width, grain length, length-width ratio, grain thickness and 1 000- grain weight were controlled by one or more common QTLs. These results provided theoretic basis for the application of large grain rice line Igl in super high-yielding rice breeding.
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