Ammonium (NH4+): Nitrate (NO3-) ratio and its relation to the changes in solution pH, growth, mineral nutrition and yield of tomatoes grown in nutrient film technique
The effects of NH4+ NO3- ratio on growth, water uptake, solution pH, mineral nutrition and yield of tomatoes were investigated using the nutrient film technique. There were six NH4+ NO3- ratios: 0:100 with and without pH control; 12.5:87.5, 25:75, 37.5:62.5 and 50:50 without pH control. There was...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Universiti Putra Malaysia Press
1995
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3287/1/Ammonium_%28NH4%2B%29_Nitrate_%28N03.pdf http://psasir.upm.edu.my/id/eprint/3287/ http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2018%20(3)%20Dec.%201995/JTAS%20Vol.18%20(3)%201995%20(Pg%20149-157).pdf |
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| Summary: | The effects of NH4+ NO3- ratio on growth, water uptake, solution pH, mineral nutrition and yield of tomatoes were
investigated using the nutrient film technique. There were six NH4+ NO3- ratios: 0:100 with and without pH
control; 12.5:87.5, 25:75, 37.5:62.5 and 50:50 without pH control. There was an increase in pH of the nutrient
solution with 0:100 and 12.5:87.5 ratios, but the pH decreased with 50:50 ratio. Higher NH4+ NO3- ratio
reduced leaf and root growth. The reduction in leafand root growth could be attributed to reduction o fplant water
uptake. Fruit fresh weight was reduced and the percentage of blossom-end rot increased with higher ratio of
NH4+ NO3- in the solution. Increased ratio of NH4+ NO3- increased N content and decreased Ca content in all
the plant tissues. P, K and Mg content decreased in leaf tissue with increasing NH4+ NO3- ratio. |
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