Agronomic evaluation of Cuban liquid fertilizers on the protected cultivation of HA 3019 tomato (Solanum lycopersicum L.) hybrid
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Abstract
Dimitrova�?� Horticultural Research Institute, with the objective
of evaluating the agronomic effectiveness of the liquid fertilizer
line produced by �??Revolución de Octubre�?� Chemical
Enterprise in Nuevitas, Camagüey, on the protected
cultivation of HA 3019 tomato hybrid. Two fertigation designs
with different fertilizer sources were studied, guaranteeing for
both a similar electrical conductivity and macronutrient
concentration in the nutrient solution. The following Cuban
liquid formulas 5-10-5, 6-6-6, 3-0-11 (KNO
3
) y 8-0-0-17 Ca (NO
3
)
2
were included in the first design whereas the imported single
salts H
3
PO
4
, K
2
SO
4
y MgSO
4
, KNO
3
y Ca(NO
3
)
2
in the second
one. Plant height, growth rate, leaf macroelement content, to-
tal yield and yield per size, some yield components, some
external and nutritional fruit quality components, as well as
fruit weight losses at postharvest conservation were
determined. Similar yields were achieved in both designs, which
were considered acceptable for the experimental period: 67,08
and 68,11 t/ha, and about 91 % of the production was qualified
as extra+first category. Not a differentiated effect was recorded
for yield components or the external (strength, inner color
disorder, mesocarp and endocarp diameters) and internal
quality variables (dry matter, total soluble solids, acidity, pH,
vit C and N-P-K contents); meanwhile postharvest losses
showed statistical differences just after 21 days, the least
percentages being recorded by liquid fertilizers. From the
agronomical point of view, it is feasible to include liquid for-
mulas in the tomato fertigation program for protected
cultivation.
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