Method of estimating nitrate nitrogen concentration of standing corn (Zea mays L.) by nitrate nitrogen concentration in stem juice
1999
Sunaga, Y. (National Grassland Research Inst., Nishinasuno, Tochigi (Japan)) | Harada, H. | Hatanaka, T.
The method of estimating nitrate nitrogen concentration of the standing corn (Zea mays L.) in yellow-ripe stage was developed using the equation by Harada et al. that is, nitrate nitrogen concentration of the whole plant on the basis of dry matter can be closely estimated by multiplying the concentration factor by the dilution factor. The concentration factor is nitrate nitrogen concentration of the stem on the basis of fresh matter and the dilution factor is dry matter partitioning ratio of stem divided by dry matter rate of stem. Our results showed concentration factor was significantly correlated with nitrate nitrogen concentration in the juice squeezed from cuts of stems of 10mm thickness at a height of 50cm aboveground (correlation coefficient: 0.871, p0.001). The regression equation was found as Y
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