Concentration of phosphorus and its uptake by aboveground phytomass of spring barley (Hordeum vulgare L.) under drought stress conditions | Koncentrácia fosforu a jeho odber nadzemnou fytomasou jačmeňa jarného (Hordeum vulgare L.) v podmienkach stresu zo sucha
2011
Slamka, P., Slovenská poľnohospodárska univ., Nitra (Slovak Republic), Fakulta agrobiológie a potravinových zdrojov, Katedra agrochémie a výživy rastlín | Krček, M.
Effect of nitrogen rates (1.0 g, 2.0 g N per pot) on P concentration and uptake of P by aboveground phytomass of spring barley (variety Kompakt) and grain yield was investigated in 3-year pot experiment. Plants were grown under optimum moisture regime and drought stress was induced during growth stage of tillering, shooting and earing, respectively. Before and after respective stress period the plants were grown under optimal water regime. Ageing of the plant cover caused a decrease of P concentration in dry matter of aboveground phytomass. Fertilization of barley by nitrogen reduced the phosphorus concentration in dry matter in all investigated growth stages at both water regimes in comparison with unfertilized control treatment. In oposition to P concentration, uptake of P by aboveground phytomass was increasing by ageing of plant cover in both fertilized and unfertilized treatments with maximum in growth stage of earing. Fertilization with nitrogen increased amount of up-taken phosphorus 2-5 times comparing to control treatment. Drought stress adversaly influenced P uptake which decreased by 20 - 35% in comparison to uptake by plants grown under optimal water regime. Plants exposed to drought stress in growth stage of tillering were the most tolerant and still provided relatively high grain yield.
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