Nitrogen and phosphorus management of spring wheat plants following the application of growth regulators and increasing potassium fertilization rates
2006
Wierzbowska, J. | Bowszys, T. | Sienkiewicz, S.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Agricultural Chemistry and Environmental Protection
A pot experiment was performed to determine the effects of kinetin, gibberelin and auxin on the concentration, accumulation and distribution of nitrogen and phosphorus in spring wheat grown under conditions of increasing potassium fertilization rates. Auxin increased the nitrogen content of wheat grain and glumes, whereas kinetin and gibberellin decreased nitrogen concentration in wheat grain and vegetative organs. All phytohormones increased the phosphorus content of wheat grain, glumes and flag leaf, and in the case of kinetin and gibberellin the concentration of this element increased also in wheat stems. The highest nitrogen content of wheat grain was achieved as a result of the application of the highest potassium rates. Phosphorus concentration in wheat grain increased proportionally to potassium levels. Phytohormones reduced nitrogen accumulation and increased phosphorus concentration in wheat grain. All regulators caused a decrease in nitrogen accumulation in whole wheat plants, while phosphorus accumulation increased following the application of gibberellin. Gibberellin and auxin increased nitrogen accumulation in grain by 4.23 percent, and all phytohormones increased phosphorus accumulation in grain
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