Nitrogen uptake, yield and gross income of sweet corn as affected by nitrogen.
1990
Lee S.S. | Choi S.J.
A sweet corn hybrid, Golden Cross Bantam 70, was grown at 0, 5, 10, 15 and 20Kg/10a of nitrogen (N) under the transparent P. E. film mulch to find the best yield evaluation method. Culm length, ear height, number of tillers increased and silking date was earlier by 1-2 days with increased N level. Leaf area index of main culm at harvest increased with increased N level. Marketable ears were divided into two classes according to the whole sale market price; The first grade of which husked ear weight over 150g (unhusked ear weight 230g) and the second grade of which husked ear weight between 100 and 150g (unhusked ear weight between 180 and 230g). Average length, thickness, and weight of both grades of marketable ears were not different among the N levels. The proportion of the first grade increased with increased N level. However, total number and weight of marketable ears and gross income per 10a calculated considering weight and number of ears increased with increaed N level. There were highly positive correlations between gross income and ear number or ear weight per 10a. The number and weight of marketable ears were underestimted at high N levels compared with gross income. Dry matter yield of stover ranged 740-963Kg/10a and increased with increased N level with 20.8-24.5 % dry matter content. Rice black-streaked dwarf virus infection rate was 11.8-15.0 %, but it was not related to N level. N concentration in ear was similar but that in stover increased with increased N level. Total N uptake increased but N recovery decreased with increased N level.
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