Effect of Different Planting Methods for Increasing Seedlings to Save Nitrogen on Dry Matter Accumulation and Distribution in Late Rice of Double-cropping Rice

doi:10.7668/hbnxb.201750963

Abstract

Abstract: The effect of different planting methods for increasing seedlings to save nitrogen on the yield of double cropping rice was explored under the mode of water-saving cultivation. In 2016, a comparative trial on planting methods of artificial transplanting, machine-transplanted seeding and seeding slinging were conducted in the Ladder ridge paddy area of Lengshuitan District, Hunan Province. The results showed that the proportion of dry matter accumulation per plant at different growth stages of rice was 43.99%-71.71% from tillering stage to heading stage, 12.68%-28.17% from milk ripening stage to mature stage, 11.41%-25.36% from sowing date to tillering stage, and 4.20%-11.01% from heading stage to milk ripening stage. The correlation coefficient between dry matter accumulation and yield per plant was 0.77 from milk ripening to maturity, 0.38 from tillering to heading, 0.12 from heading to ripening, and-0.18 from sowing to tillering period. The stem and sheath per plant, and the leaf biomass showed a trend of increasing first and then decreasing, reaching the highest value at the heading stage. The proportion of total biomass per plant showed a downward trend, and the proportion of panicle biomass increased gradually. The proportion of stem and sheath biomass to total biomass of rice at each growth stage was 51.04%-59.69% at tillering stage, 46.03%-50.68% at heading stage, 31.82%-42.15% at milk ripening stage, and 20.97%-27.93% at maturity stage. The ratio of leaf biomass to total biomass at each growth stage was 40.31%-48.96% at tillering stage, 25.45%-28.53% at heading stage, 17.05%-20.15% at milk ripening stage, and 11.93%-14.33% at mature stage. In all treatments, the amount and proportion of dry matter accumulation was highest from tillering to heading stage, and the lowest from heading to milking stage. From sowing to tillering stage, the ratio of dry matter accumulation was the highest in the model of late rice no-tillage machine transplanting and machine harvesting+increasing seedlings to save nitrogen. From milky to mature stage, the highest proportion of dry matter accumulation came from the mode of late rice no-tillage artificial transplanting and artificial harvesting+increasing seedlings to save nitrogen.

Key words: Rice, Water saving, Planting methods, Yield, Dry matter accumulation, Distribution

CLC Number:

TANG Zhiwei, LONG Wenfei, DAI Wei, FU Zhiqiang. Effect of Different Planting Methods for Increasing Seedlings to Save Nitrogen on Dry Matter Accumulation and Distribution in Late Rice of Double-cropping Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(2): 162-170. doi: 10.7668/hbnxb.201750963.

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