Effect of Top-dressing and Planting Density on the Number of Spikelets and Yield of Rice Cultivated with Nitrogen-free Basal Dressing

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概要

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• The effects of nitrogen-free basal dressing(BNo)and top-dressing on the growth and yield of two rice varieties, Akitakomachi and Hitomebore, planted at a standard density(22.2 hills m^<-2>)and sparse density(16.7 hills m^<-2>)were examined. The maximum number of stems and the number of panicles per unit area were lower in both BNo plots with a standard planting density(BNo22)and sparse planting density(BNo17)than in the control plot with standard nitrogen dressing and standard planting density(CONT)in both varieties. The number of panicles and spikelets per unit area was lower in both BNo22 and BNo17 than in CONT, but the number of spikelets per panicle in BNo17 was significantly higher than that in CONT, although that in BNo22 was not. In BNo22, the percentage of ripened grains and 1,000 grain weight were significantly higher than those in CONT, but in BNo17, 1,000 grain weight was similar to that in CONT, although the percentage of ripened grains was higher than that in CONT. Grain yield in both BNo22 and BNo17 was not significantly different from that in CONT, and that in BNo17 was 660 and 710g m^<-2> in Akitakomachi and Hitomebore, respectively. The leaf area index was lower and crop growth rate was higher in both BNo22 and BNo17 than in CONT at the grain-filling stage. The net assimilation rate and specific leaf weight were significantly higher in BNo22 and BNo17 than in CONT at the panicle formation and grain-filling stages, respectively. Nitrogen top-dressing at the neck node differentiation stage was found to be very useful for the cultivation of these rice varieties under BNo with sparse planting density in the Tohoku district.

• 日本作物学会の論文

著者

• Truong Hop

  Faculty Of Agriculture Iwate University

• Murata T

  Faculty Of Agriculture Iwate University

• Hirano Mitsugu

  Faculty of Agriculture, Iwate University

• Kuroda Eiki

  Faculty Of Agriculture Iwate University

• Hirano Mitsugu

  Faculty Of Agriculture Iwate University

• Murata Takao

  Faculty Of Agriculture Iwate University

• Iwamoto Shigeru

  Hidaka-Chubu Regional Agricultural Extension Center

関連論文

• Analysis of the Number of Spikelets per Panicle on the Main Stems, Primary and Secondary Tillers of Different Rice Genotypes Grown under the Conventional and Nitrogen-Free Basal Dressing Accompanied with Sparse Planting Density Practices(Agronomy)
• Analysis of Lodging-Resistant Characteristics of Different Rice Genotypes Grown under the Standard and Nitrogen-Free Basal Dressing Accompanied with Sparse Planting Density Practices(Crop Physiology and Ecology)
• Analysis of the Dry Matter Production Process Related to Yield and Yield Components of Rice Plants Grown under the Practice of Nitrogen-Free Basal Dressing Accompanied with Sparse Planting Density(Crop Physiology and Ecology)
• Varietal Differences in the Responses of Yield Components of Rice Plants to Nitrogen-Free Basal Dressing Accompanied with Sparse Planting Density in the Tohoku Region of Japan(Crop Physiology and Ecology)
• Varietal Differences in Tillering and Yield Responses of Rice Plants to Nitrogen-Free Basal Dressing Accompanied with Sparse Planting Density in the Tohoku Region of Japan(Crop Physiology and Ecology)
• Studies on organic acid metabolism and ethylene production during controlled atmosphere storage of apples (Mallus pumila MILLER, cv. Rolls)
• Effect of Top-dressing and Planting Density on the Number of Spikelets and Yield of Rice Cultivated with Nitrogen-free Basal Dressing

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