Balance of nitrogen, phosphorus and potassium in the organic crop production system on the light soil
Cezary Trawczyński
Zakład Agronomii Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin — PIB, Oddział Jadwisin (Poland)
Abstract
The aim of this investigation was to determine balance of nitrogen, phosphorus and potassium in organic crop rotation system on light soil. The crop rotation comprised following agricultural plant species: potato, buckwheat, yellow lupine + oat, rye, oat. Apart from these main species 2 plants were cultivated as an intercrop that was ploughed in: field pea and serradella. Before potato cultivation the manure in dose of 25 t·ha-1 was applied and before the cultivation of oat 0.5 dose of manure, that is 12.5 t·ha-1 was applied. The calculations were based on real data of obtained yields and nutrients content in the yields. The ,,on surface of field” method was used in this investigation. In the crop rotation positive balances of nitrogen (+39.5 kg N·ha-1 per year-1) and potassium (+19.6 kg K·ha-1 per year-1) and slightly negative one for phosphorus (-1.5 kg P·ha-1 per year-1) were noted.
Keywords:
crop rotation, nutrient balance, light soil, organic systemReferences
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Authors
Cezary TrawczyńskiZakład Agronomii Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin — PIB, Oddział Jadwisin Poland
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