Influence of oxygen conditions on the yield and mineral composition of triticale cv. Jago
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Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, P.O. Box 201, 20-290 Lublin 27, Poland
Acceptance date: 2001-02-13
Int. Agrophys. 2001, 15(4): 273-277
Plants in the farmland ecosystem are subject to impeded aeration at some stages in their development. The achievement of long term tolerance to prolonged periods of poor aeration by some plants holds considerable economic and environmental significance. Short periods of flooding can damage the roots and this in turn, may lead to the appearance of stress symptoms. Soil flooding reduces shoot and root growth, dry matter accumulation, and causes the disturbance of plant mineral composition. The influence of differentiated soil aeration on triticale cv. Jago mineral composition and the uptake of nutritive components by grain was studied in a greenhouse pot experiment. Soil aeration was differentiated by manipulating soil water tension and bulk density. The soil bulk densities used during the experiment were: 1.20, 1.35 and 1.50 Mg m-3. The soil water tensions used were 15-80 kPa (control), 2-5 kPa and 0 kPa (2-5 mm of water ponded on the soil surface). The 2-5 hPa and 0 kPa water tensions were applied beginning at 3 growth stages (stress I at tillering stage, stress II at shooting, stress III beginning of flowering) for a period of 15 days. The yield of grain mass at full maturity decreased significantly when soil hypoxia were imposed at the tillering stage. The analysis of variance showed a significant reduction of the straw mass and total yield of triticale at higher bulk densities. The concentrations of N, P, K in grain at full maturity were not significantly correlated with oxygenation indexes (ODR and Eh). The uptake of N, P, K by triticale grain increased linearly with redox potential in the range of 100-580 mV. Nitrogen uptake by triticale grain was positively correlated with ODR in the range of 20-80 mg m-2 s-1 . Phosphorus and potassium uptake were not found to be correlated with ODR. The tested cultivar of triticale was less sensitive to a deficiency of oxygen as compared to another cereals plants such as rye, wheat and barley.
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