Nitrogen-potassium ratios to fertigate the protected tomato (Solanum lycopersicum L.) crop and its effect on biomass accumulation and nutrient uptake
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Abstract
Dimitrova Horticultural Research Institute, with the objective
of evaluating the effect of nutrient solutions with different
nitrogen/potassium fertigation ratios for protected tomato
(HA-3019 hybrid) crop on biomass accumulation and
macronutrient uptake within two planting times. Four N/K
ratios (1:1.5; 1:2.0, 1:2.5 or production check, and 1:3.0) were
studied in spring-summer season (March/July) and winter
(September/January). Biomass accumulation (g.m-2) and N, P,
K, Ca and Mg consumption were determined per plant organ
and total biomass (g.m-2) for each treatment. In winter, dry
weight and N, K and Ca uptake were significantly higher than
in spring-summer season, whereas the top growing and
nutrient consumption period corresponded to full production
phase. The lowest leaf, stem and total biomass production
corresponded to N/K ratio 1:1.5 in spring-summer; meanwhile
dry fruit weight was significantly higher for N/K ratios 1:2.0
and 1:2.5. In winter season, significant fruit and total biomass
values were recorded for N/K ratio 1:2.5 (production check);
however, leave growth was similar in treatments 2, 3 and 4
(1:2.0, 1:2.5 and 1:3.0). Macronutrient extraction showed a similar
behaviour to that obtained for biomass accumulation.
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