A Simple Method for Estimating the Nitrate Nitrogen Concentration Based on Dry Matter in Standing Sorghum (Sorghum bicolor Moench) Using Stem Juice Test and Dry Matter Content
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概要
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A simple method was developed for estimating the nitrate nitrogen (NO_3-N) concentration in standing sorghum (Sorghum bicolor Moench) crop at maturity. In the method, the concentration of NO_3-N in whole plants on a dry matter basis can be accurately estimated by multiplying the concentration factor (CF, NO_3-N concentration of stem on a fresh matter basis) by the dilution factor (DF, dry matter partitioning ratio of stem divided by the dry matter content of stem or fresh matter weight of stem divided by the dry matter weight of whole plant). CF was linearly correlated with the NO_3-N concentration in stem juice squeezed from stem discs with a thickness of 1 cm obtained by cutting horizontally at a location corresponding to a ratio of 25% to the total stem length. CF can be estimated by multiplying the NO_3-N concentration in stem juice by a factor of 0.68 or 0.53 for grain and dual purpose types or sorgo type, respectively. The values of the coefficients of determination (R^2) of the linear regression were above 0.7. When DF was plotted with the dry matter content of whole plants (DM%), regression curves were obtained for both sorghum types with R^2>0.8. The equations were as follows : DF=0.00721X^2-0.503X+10.72 for grain and dual purpose types, DF=0.00445X^2-0.337X+8.86 for sorgo type, where X is DM%. The NO_3-N concentrations estimated by multiplying CF by DF enabled to predict the measured NO_3-N concentrations with an R^2 of 0.873.
- 社団法人日本土壌肥料学会の論文
著者
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SUNAGA Yoshihito
National Institute of Livestock and Grassland Science
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HARADA Hisatomi
National Institute of Livestock and Grassland Science
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HATANAKA Tetsuya
National Institute of Livestock and Grassland Science
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Harada H
National Institute Of Livestock And Grassland Science:(present Office)agriculture Forestry And Fishe
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Harada Hisatomi
National Grassland Research Institute
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Yoshimura Yoshinori
National Institute of Livestock and Grassland Science
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Hatanaka T
National Institute Of Livestock And Grassland Science
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Hatanaka Tetsuya
National Grassland Research Institute
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