Unbalanced soil nutrition and its effect on tomato (Lycopersicon solanum L.) and cucumber (Cucumis sativus L.) yield under protected cultivation conditions
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Abstract
conditions, high fertilizer rates are applied through fertigation,
perhaps without knowing soil fertility regime. A study was
developed on this basis, using Israelite cucumber (Cucumis
sativus L.) HA 454 and tomato (Lycopersicon esculentum Mill.)
HA 3108 hybrids as horticultural species. The soil correspon-
ded to an eutric lixiviated Red Ferralitic (Rhodic Ferralsol). Soil
samples taken before plantation and after the last harvest were
analyzed. Tomato was planted on Oct 19, 2001 whereas
cucumber on Oct 27, 2001. The fertilizer was applied through
fertigation by means of drip irrigation three times a week and
following a previously defined fertilization program. In the soil,
the first pH value was close to the neutral one (6.70), reaching
alkalinity (7.60) at the end; organic matter content, although
considered medium (3.00-3.10 %), decreased towards the end
of the cycle (2.2 %); K content was high (1.25 cmol.kg-1) and
Ca content corresponded to the appropriate values for this type of soil (12.2 cmol.kg-1), it increasing with time (14.7 cmol.kg-1); Mg content was low (1.90 cmol.kg-1), it decreasing at the end (1.20 cmol.kg-1); Ca:Mg ratio was unfavorable to every cultivar (8.0), it reaching up to 16.4; phosphorus availability was high (355 mg.kg-1), without being altered by fertigation. Both species yields were lower than the expected ones, as a result of a nutritional unbalance determined by inadequate
internutrient relations enhanced by fertigation.
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