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Vegetable Crops Prefer Different Ratios of Ammonium-N and Nitrate-N in the Growth Media

Authors:

K. K. K. Nawarathna,

University of Peradeniya, Peradeniya, LK
About K. K. K.
Postgraduate Institute of Agriculture

Horticultural Crops Research and Development Institute, Gannoruwa, Peradeniya
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W. S. Dandeniya ,

University of Peradeniya, Peradeniya, LK
About W. S.
Department of Soil Science, Faculty of Agriculture
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R. S. Dharmakeerthi,

University of Peradeniya, Peradeniya, LK
About R. S.
Department of Soil Science, Faculty of Agriculture
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P. Weerasinghe

Ministry of Agriculture, 288 DPJ Tower, Sir Jayawardanapura Mawatha, Rajagiriya, LK
About P.
Climate Resilience and Irrigated Agriculture Project
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Abstract

Understanding the preference of a crop for forms of nitrogen (N) is important to ensure efficient use of N-sources in agriculture. A study was conducted to assess nutrient uptake and dry matter yield of six vegetable crops under different ratios of ammonium- N (NH4+-N) and nitrate-N (NO3-N) in growth medium. Seedlings of cabbage, carrot, capsicum, knolkhol, lettuce, and tomato, were supplied with five N-treatments (NH4+-N: NO3-N in the ratios of 0:100, 25:75, 50:50, 75:25 and 100:0) under controlled environment in sand culture. Six weeks after initiating treatments plants were harvested and dry matter recorded. Plants were analysed for total N, P and K contents. Dry-matter yield, N and K concentrations in shoot-tissues in response to Ntreatments were significantly different (p <0.05) among crops. Tomato and knolkhol showed high dry matter yield and N content when supplied with NO3-N than NH4+-N. The highest dry matter yield for cabbage was obtained with equal supply of NO3-N and NH4+-N than supplying either form alone. Dry matter yield and N concentration in shoots of lettuce, capsicum and carrot were not significantly affected (p>0.05) by N-treatment. Supplying NH4+-N alone significantly reduced K concentration in shoot tissues in knolkhol, capsicum and tomato. This study revealed that performance of vegetable crops is affected by the NH4+-N: NO3-N in the growth medium. This knowledge can be utilized to optimize fertilizer-N usage in vegetable cultivation.
How to Cite: Nawarathna, K.K.K., Dandeniya, W.S., Dharmakeerthi, R.S. and Weerasinghe, P., 2021. Vegetable Crops Prefer Different Ratios of Ammonium-N and Nitrate-N in the Growth Media. Tropical Agricultural Research, 32(1), pp.95–104. DOI: http://doi.org/10.4038/tar.v32i1.8445
Published on 01 Jan 2021.
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