Published in Scientific Papers. Series B, Horticulture, Vol. LXVII, Issue 1
Written by Vera PETROVA, Ivanka MITOVA

A study was made to determine the influence of incorporate carbonized plant residues, as a soil improver, on the growth and development of Swiss chard (Beta vulgaris subsp. vulgaris). A pot experiment was conduct on two soil types: Vertisols and Luvisol soils. Five variants were develop in three replicates, as follow: 1. Control – pure soil without fertilization; 2. Soil + biochar (BC); 3. BC+N₂₀₀P₂₀₀K₂₅₀; 4. BC+N_2\400P₂₀₀K₂₅₀; 5. BC+N₆₀₀P₂₀₀K₂₅₀ and the same variants (6, 7, 8, 9, 10) on Luvisol. Irrespective of the different starting supply of nutrients in two soil types, the highest yield of plant mass was recorded in the variant with BC+N₂₀₀P₂₀₀K₂₅₀, followed by the variant with BC+N₄₀₀P₂₀₀K₂₅₀. The fresh mass recorded on Vertisol significantly exceeds that on Luvisol.

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