RELATIVE ADDITION RATE TECHNIQUE AS A TOOL FOR ALLEVIATING AMMONIUM TOXICITY IN CUCUMBER (CUCUMIS SATIVUS L., CV. STYX) PLANTS

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SAJJADINIA A.; ROOSTA H.R.; SOORI M.K.; RAHIMI A.

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Journal: Journal of Horticultural Science Year:2010 | Volume:24 | Issue: 1 Page(s): 59-63

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Information Journal Paper

Title

RELATIVE ADDITION RATE TECHNIQUE AS A TOOL FOR ALLEVIATING AMMONIUM TOXICITY IN CUCUMBER (CUCUMIS SATIVUS L., CV. STYX) PLANTS

Author(s)

SAJJADINIA A. | ROOSTA H.R. | SOORI M.K. | RAHIMI A. | Issue Writer Certificate

Keywords

NITROGENQ2

AMMONIUM TOXICITYQ2

NNITRATEQ2

RELATIVE ADDITION RATEQ3

HYDROPONICSQ3

CUCUMBERQ2

Abstract

In this study different proportions of NH4+ and NO3- in the growth medium on plant growth were investigated in hydroponic greenhouse experiments. The objectives of these studies were to investigate if ammonium (NH4+) stress in CUCUMBER, a species sensitive to NH4+ toxicity, can be alleviated by matching the NITROGEN supply rate to the plant NITROGEN demand. Ammonium was applied at a RELATIVE ADDITION RATE of R=0.15 day-1 or R=0.25 day-1. For comparison, plants were also grown with NO3- as N source, as well as at constant concentrations of 1 and 4 mM NH4+. The fresh weight of plants grown with NH4+ as sole N source at R=0.15 day-1 was similar to that of NO3--fed plants, while at the high NH4+ supply rate of 0.25 day-1 a small growth reduction occurred. When available as a constant concentration, NH4+ decreased plant growth at 4 mM. Root: shoot ratio was lower in NH4+-fed plants compared to NO3--fed plants, and the NH4+-fed plants had more branched roots. Calcium concentration decreased in the roots, stems and leaves of NH4+-fed plants compared to NO3--fed plants. There were no differences in leaf chlorophyll fluorescence at the various N treatments. It is concluded that even a putative NH4+ sensitive species such as CUCUMBER can tolerate NH4+ if the supply rate matches the N demand of the plants.

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APA: Copy

SAJJADINIA, A., ROOSTA, H.R., SOORI, M.K., & RAHIMI, A.. (2010). RELATIVE ADDITION RATE TECHNIQUE AS A TOOL FOR ALLEVIATING AMMONIUM TOXICITY IN CUCUMBER (CUCUMIS SATIVUS L., CV. STYX) PLANTS. JOURNAL OF HORTICULTURE SCIENCE (AGRICULTURAL SCIENCES AND TECHNOLOGY), 24(1), 59-63. SID. https://sid.ir/paper/142257/en

Vancouver: Copy

SAJJADINIA A., ROOSTA H.R., SOORI M.K., RAHIMI A.. RELATIVE ADDITION RATE TECHNIQUE AS A TOOL FOR ALLEVIATING AMMONIUM TOXICITY IN CUCUMBER (CUCUMIS SATIVUS L., CV. STYX) PLANTS. JOURNAL OF HORTICULTURE SCIENCE (AGRICULTURAL SCIENCES AND TECHNOLOGY)[Internet]. 2010;24(1):59-63. Available from: https://sid.ir/paper/142257/en

IEEE: Copy

A. SAJJADINIA, H.R. ROOSTA, M.K. SOORI, and A. RAHIMI, “RELATIVE ADDITION RATE TECHNIQUE AS A TOOL FOR ALLEVIATING AMMONIUM TOXICITY IN CUCUMBER (CUCUMIS SATIVUS L., CV. STYX) PLANTS,” JOURNAL OF HORTICULTURE SCIENCE (AGRICULTURAL SCIENCES AND TECHNOLOGY), vol. 24, no. 1, pp. 59–63, 2010, [Online]. Available: https://sid.ir/paper/142257/en

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