EFFECT OF KALIPLANT ON PEA YIELD AND USE OF Soil POTASSIUM BY PLANTS ON LUVISOL LOAMY SAND SOIL
The effect of Kaliplant on pea yield and different potassium forms use by pea plants was found to depend on mobile potassium content in Luvisol loamy sand soil as well as on the rate of K-fertilizer. Significant stimulation effects of Kaliplant on the use of water-soluble, exchangeable and unexchangeable potassium forms were observed under following conditions: at the first level of soil K-supply (94 mg kg <sup>-1 </sup>K<sub>2</sub>O) - at treatments NP, NPK<sub>60</sub> и NPK<sub>90</sub>; at the second level (146 mg kg <sup>-1 </sup>K<sub>2</sub>O) - at treatments NP, NPK<sub>60 </sub>and at the third level (164 mg kg <sup>-1 </sup>K<sub>2</sub>O) - at treatment NP.