Balance of nitrogen, phosphorus and potassium in integrated and ecological farming system | Bilancia dusíka, fosforu a draslíka v integrovanom a ekologickom systéme hospodárenia na pôde
2010
Kajanovičová, I., Slovenská poľnohospodárska univ., Nitra (Slovak Republic). Fakulta agrobiológie a potravinových zdrojov, Katedra agrochémie a výživy rastlín | Ložek, O. | Slamka, P. | Várady, T.
Inputs/outputs balance of nitrogen, phosphorus and potassium was realized under integrated and ecological farming system. Within both farming system two variants were investigated: fertilized and non fertilized. Crops used in the experiment were as follows: winter wheat, spring barley, lucerne, pea, silage com, faba bean. Rotations of crops are shown in table 2. Fertilization was performed on the basis of soil and plant analyses using balance method. Inputs of nutrient included nutrients from seed, organic and mineral fertilizers, symbiotic fixation, asymbiotic fixation and precipitation. Outputs of nutrients were represented by off-take by crop yield, off-take by by-product, leaching, volatilization and denitrification. The balance was calculated as difference of total inputs and total outputs. Percentages of nutrient substitution were calculated as total inputs divided by total output and multiplied by 100. Calculation balance of NPK nutrients was positive only in the case with the phosphorus in integrated farming system (IS) on fertilized variant. Percentage of phosphorus substitution reached the level of 162.02% and in ecological system (ES) on fertilized variant 33.87%. Percentage of nitrogen substitution amounted 98.22% in the integrated farming system and 84.40% in the ecological farming system. In integrated farming system was percentage of potassium substitution 44.99% and in ecological farming system 23.99%. Deficit of nutrients there were expressive on non fertilized variant in both farming system. By the potassium there were percentages of substitution in IS 0.96% and in ES 1.01%.
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