[The effect of crop rotation fertilization on the content of mobile compounds of phosphorus and potassium in soil]
Persikova, T.F.(Belarus State Academy of Agriculture, Gorki (Belarus))
Research conducted on grain-grass-row crop rotation showed that toy the end of the first rotation the annual gross of mobile phosphorus and potassium after application of mineral fertilizers after lupine amounted up to 9.4 and 2.8 and after clover 5.2 and 8.0 mg/kg of soil accordingly. Taking into consideration the aftereffects of stem-root residues of clover the annual gross of phosphorus and potassium after organic-mineral system of fertilization of the further culture of early potato amounted up to 5.6 and 2.4 mg/kg of soil accordingly, after mineral system of fertilization - 2 mg/kg of phosphorus. After stem-root residues of the Lupinus angustifolius after organic-mineral system of fertilization of the further culture of crop rotation of spring wheat the annual gross of phosphorus amounted up to 9.2, potassium - 4.8 mg/kg of soil. Potassium content under mineral system of potato and spring wheat did not change
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