Effect of phosphoric fertilizers on agrochemical properties of soddy-podzolic soil and the yield of agricultural crops | Влияние фосфорных удобрений на агрохимические свойства дерново-подзолистой почвы и урожайность сельскохозяйственных культур
2009
Mineev, V.G. | Kovalenko, A.A., Lomonosov Moscow State Univ. (Russian Federation) | Vaulin, A.V. | Afanas'ev, R.A., The D.N. Pryanishnikov All-Russia Research and Development Inst. of Agrochemistry, Moscow (Russian Federation)
Stationary field experiments were conducted in the Moscow Region in 1979-1990. Tested soil area was sod-podzolic medium clay cultivated one. In 1977 the land plot was limed by limestone flour at a rate of total hydrolytic acidity at the dose of 8 000 kg /ha. The variants of experience differed by content of mobile P, which was approximately 200, 300 and 400 milli gram P2O2/kg. Phosphorus was applied both in mineral and in organic (cattle litter manure) forms at rates of 240-2240 reactant kg/ha. The percentage of organic P in the fertilizer did not exceed 20%. Different crops (potatoes, vetch and oat mixture of hay, winter wheat, barley) were cultivated in a 4-field rotation. Nitrogen and potash fertilizers were also applied at rates of 240-960 reactant kg/ha and 240-1040 reactant kg/ha respectively to create an agricultural background and directly for the culture. P application at a rate of more than 1000 kg/ha contributed soil transition into a category of high cultivated. In that case there was a significant consolidation of P in sparingly soluble forms in the plow layer and the movement of phosphates into the subsoil layers. It happened due to increase of the proportion of highly mobile compounds in the phosphate pool of the soil. Unit costs of P fertilizers varied from 12 to 130 kg P2O2/ha, averaging 82 kg P2O2/ha to increase the content of mobile P by 10 mg P2O2/kg in the different variants of experiment. They grew up while P application rates increased.
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