Indian Journal of Agricultural Research

  • Chief EditorV. Geethalakshmi

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Indian Journal of Agricultural Research, volume 35 issue 4 (december 2001) : 219 - 225

NITRATE ACCUMULATION AND METABOLISM IN LETTUCE CULTIVARS AS INFLUENCED BY AMMONIUM: NITRATE RATIO IN RECIRCULATING NUTRIENT SOLUTION

K.N. AI-Redhaiman
1Department of Horticulture and Forestry, College of Agriculture and Veterinary Medicine, King Saud University, Buraydah, Al-Qassim, Saudi Arabia

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Cite article:- AI-Redhaiman K.N. (2024). NITRATE ACCUMULATION AND METABOLISM IN LETTUCE CULTIVARS AS INFLUENCED BY AMMONIUM: NITRATE RATIO IN RECIRCULATING NUTRIENT SOLUTION. Indian Journal of Agricultural Research. 35(4): 219 - 225. doi: .

ABSTRACT

Tissue NO 3 − concentrations in hydroponically-grown lettuce were reduced significantly with increasing NH 4 +: NO 3 − ratios in the nutrient solution. However, effects of mixed-Nitrogen nutrition on plant growth response varied considerably, depending on cultivar. With increasing solution NH 4 +: NO 3 − ratios up to 50:50 (in a 15.0 mM N solution), shoot NO 3 − concentrations in romaine lettuce at full head development were reduced by approximately 58% (52% on a fresh weight basis), while shoot dry weights increased by 46% (28% fresh weight). In butterhead cultivars, a solution NH 4 +: NO 3 − ratio of 50:50 decreased shoot NO 3 − concentrations by 58% (54% fresh weight basis), but shoot growth was also reduced by 9% (15% fresh weight basis).

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