ISHS Acta Horticulturae 1327: IV International Symposium on Horticulture in Europe - SHE2021
Effect of drought and mono-potassium phosphate (MKP) on some physiological attributes and macronutrient translocation in potato crop |
| Authors: | Y.N. Sassine, R. Bejjani, E. Tabet, A.M.R. Abdel-mawgoud, M.H. Yordanova, S.M. Alturki |
| Keywords: | Solanum tuberosum, water shortage, nutrient competition, physiology, growth |
| DOI: | 10.17660/ActaHortic.2021.1327.24 |
| Abstract:
Nutrient uptake and physiology of potato plants in response to monopotassium-phosphate (MKP:0-52-34) and drought was investigated in the current study. Three different irrigation regimes were applied: 100, 75 and 50% of crop evapotranspiration (ETc). MKP was added twice at 14 and 28 days after emergence with a dose of 3 g plant‑1. Plants irrigated by a water volume representing 100% of ETc with no MKP application were considered as control. As a result, increasing drought stress limited some of the macro nutrient uptake and decreased chlorophyll a, b and total chlorophyll content at 75 and 50% Etc. MKP application reduced total chlorophyll content by 12.95, 17.12 and 8.75 mg mL‑1 at 100%, 75 and 50% of ETc, respectively. On the other hand, MKP increased P and K content by approximately 1-2 mg g‑1 in tubers, by 1-6 mg g‑1 in stems and by 0.5-6 mg g‑1 in leaves depending on the irrigation regime. Surprisingly, Mg was decreased significantly in all parts of MKP-treated plants compared to non-treated ones except in tubers. K/Mg ratio was increased at all irrigation regimes except in tubers following MKP application compared to non-treated plants. MKP seems to have a counteractive effect to Mg which is an essential element in the chlorophyll molecule. This counteractive effect caused a reduction in chlorophyll a, b and total chlorophyll content in the plants. | |
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