Tomato nutrition and initial growth: acid-calcium interaction
Bruno Paulo Moschini, Carlos Alberto Silva
Journal Title:Revista Agraria Academica / Agrarian Academic Journal
The objective of this study was to evaluate the nutrition and the growth of the tomato as a function of the concentrations of carbon-humic acid (C-HA) and its interactions with sources of calcium (Ca). The experimental design was a completely randomized design, in a 2x5 factorial scheme, where two sources of Ca: calcium carbonate (CaCO3) and calcium sulfate (CaSO4) were combined with four concentrations of C-HA (5,10, 50 and 100 mg kg-1of soil), in additionto a control treatment, in three replicates. The dry matter (DM) of shoot and roots, the availability of Ca in the soil and the concentration of macro and micronutrients in shoot were evaluated. The tomato plants produced more DM when the CaCO3was used. The accumulation and concentration of nutrients were not affected by the addition of C-HA; however, the nutritional state of the tomato is regulated by the source of Ca used.