Effect of nitrogen and phosphorus fertilizers on potassium content in soil and winter wheat plants
1998
Jelic, M. (Agricultural Research Institute "Serbia", Kragujevac (Yugoslavia). Center for Small Grains) | Lomovic, S. | Milivojevic, J. | Stevanovic, D.
Studies were conducted in a stationary field trial on the vertisol soil type. Two kinds of nitrogen fertilizers with six rates and two kinds of phosphorus with one rate of fertilizers were applied. Content of available potassium in the soil was slightly increased at the stem elongation stage after application of carbamide. Use of a high level of nitrogen fertilizers reduced the content of available potassium in the soil (at the full maturity stage). A greater increase of available potassium in the soil was obtained with super-phosphate as compared to MAP (mono-ammonium-phosphate). Potassium concentration in roots and shoots of winter wheat at the stem elongation stage as well as in the straw at full maturity was enhanced by high levels of nitrogen fertilizers. Application of KAN (calcium-ammonium-nitrate) exerted a greater effect on the potassium concentration in the plant than did carbamide. Use of MAP led to a high potassium concentration in wheat tops than after application of super-phosphate.
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