Citation
Ismail, Mohd Razi and Othman, Abd Aziz
(1995)
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.
Pertanika Journal of Tropical Agricultural Science, 18 (3).
pp. 149-157.
ISSN 0126-6128
Abstract
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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