Bernardoa, L.M. and Clarka , R.B. and Maranville, J.W. (1984) Nitrate/ammonium ratio effects on nutrient solution pH, dry matter yield, and nitrogen uptake of sorghum. Journal of Plant Nutrition, 7 (10). pp. 1389-1400.
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Abstract
Sorghum [Sorghum bicolor (L.) Moench] seedlings were grown in nutrient solutions in a growth chamber to investigate the effects of different ratios of NO3 – and NH4 + on nutrient solution pH, dry matter yield, and N uptake. Nutrient solutions and plant tissues were assayed throughout the time plants grew in the nutrient solutions. Nutrient solution pH depended on source of N. The pH rose to near 8 with NO3 – as the sole source of N and decreased to near or below 4 with NH4 + added to the solutions. Upon depletion of NH4 + from solution, pH values rose abruptly to near 8 and remained near this value throughout the duration of the experiments. Dry matter yield was generally higher for plants grown with some NH4 + compared to plants grown with NO3 – alone. Nitrogen uptake was generally higher in plants grown with the higher proportions of NH4 +. Nitrogen concentrations remained unchanged with plant age as NO3 –/ NH4 + ratio varied. For solutions low in NH4 +, N concentrations in roots increased with plant age. Severe Fe deficiency appeared in plants when solution pH reached and remained above 7
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Mineral nutrition, Hydroponics, Nitrogen nutrition, Sorghum bicolor |
| Author Affiliation: | Department of Agronomy, University of Nebraska, Lincoln, NE, 68583–0817 |
| Subjects: | Crop Improvement |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 06 Mar 2012 10:30 |
| Last Modified: | 06 Mar 2012 10:31 |
| Official URL: | http://dx.doi.org/10.1080/01904168409363289 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/3591 |
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