An experiment was conducted in a greenhouse growing tomato plant in sand nutrient
culture with variable ratios of Ca:Mg and potassium in the nutrient solution. The aim was
to evaluate productivity parameters and marketable fruit production. The exp
eriment
consisted of four Ca:Mg ratios (4:6, 5:5, 7.5:2.5, and 10:0.5 mM/L-1), along with three K
concentrations 0.5, 3, and 4.5 mM/L-1 in the nutrient solution. There were 12 treatment
each has three replicates.
In spite of the increase in weight and volume of fruits with increasing Ca:Mg ratios and
potassium concentrations, the increase in fruit number on the plant with increasing Ca:Mg
ratio to (5:5) and 6 mM K has the main effect on plant productivity and marketable fruits.
In this treatment plants produced 49 fruit/plant resulted from 5 fruit punches. Most of the
physiological disorder symptoms spread on fruits was blotchy shoulders, which was
associated directly with low potassium concentration in the growth medium, which
negatively influenced the marketable fruit production.
