Removal of nitrogen, phosphorus and potassium with the yield and vegetative mass of late tomatoes depending on the composition of the seedling substrate
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Author: Dimitar Cholakov, Nikolina Shopova, Dimka Haytova
The main aim of the study was to investigate the influence of the various composition of the seedling mixture on the biological removal of nitrogen, phosphorus and potassium in late tomatoes grown by applying fertigation. The seedlings were grown in 66-cell containers with a planting area of 28 cm2 per plant and cell volume of 40 cm3. The seedlings were 20-25-day old. For the purpose of the experiment three different additives to standard peat-perlitic substrate and peat-perlitic substrate with absorbent Fiba sorb were used. The results of this experiment indicated that the organic and organo-mineral additives Lumbrikal, sea sapropels and Boneprot influenced the mineral composition of the formed biomass, thus affecting the biological nutrient uptake. Under the conditions of fertigation, the biological removal was 64.13-90.56 kg/da. The amounts of NPK for the 1000-kg yield were 8.36-9.95 kg/da.

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