KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)
- Volume 44 Issue 1
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- Pages.11-19
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- 1999
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- 0252-9777(pISSN)
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- 2287-8432(eISSN)
Effect of Nitrogen Rate and Planting Density on Early Growth in Wheat
- Song, Chang-Khil (Dept. of Agronomy, Cheju National University) ;
- Richard A, Richards (CSIRO plant Industry)
- Published : 1999.03.01
Abstract
This experiment was conducted with nine wheat geno-types to choose the wheat which has excellent early vigour. 'Vigour 18' and 'ZL 59A' are excellent in the long coleoptile genotype, while 'Amery' and 'Janz' are excellent in the short coleoptile genotype. Responding to the growth stage and nitrogen level, Vigour 18 is predominant in the long coleoptile genogype, while Janz in the short coleoptile genotype. Responding to sowing density and nitrogen level, the higher the sowing density was, the shorter the leaf area of Vigour 18 and Janz. Also the leaf area turned out to larger in the plot fertilized with high nitrogen than in the plot fertilized with low nitrogen. This is true of leaf weight and root weight. Concerning specific leaf area (SLA) and leaf area ratio (LAR), the higher the sowing density was, the SLA tended to grow larger, while the SLA grew larger in the plot fertilized with low nitrogen, as were found in Vigour 18 and Janz. The roots of long coleoptile genotype, Vigour 18, turned out to grow longest on the plot sown with 3 seeds. While the roots of short coleoptile genotype, Janz, grew longest on the plot sown with 2 seeds. The relative growth rate (RGR) was the same at low N rates and high N rates. The RGR was 0.071 and 0.072 g
Keywords
- wheat;
- coleoptile;
- early vigour;
- nitrogen level;
- growth stage;
- specific leaf area (SLA);
- leaf area ratio (LAR);
- net assimilation rate (NAR);
- relative growth rate (RGR)