We evaluated the nutritional status and yield of tomato hybrid "Vênus", grown on substrates, with application of humic acids (AH) and fertigation. Four doses of AH (0, 20, 40 and 80 L-1 ha) and four substrates: S1 (coconut fiber (CF)), S2 (FC + carbonized coffee husk (CC) in the ratio 1:3), S3 (CF + CC - in the ratio 2:3) and S4 (CC) were evaluated following the randomized blocks design in factorial 4x4 scheme with four replications. The 35-day old seedlings were transplanted into plastic bags of 7 L. The humic acids were applied four times in eight-day intervals, and the first application was carried out eight days after transplanting. There was no significant effect of the treatments on the content of N, K and S in leaves and on non-marketable fruits yield. However, there was a significant effect of the substrates on the content of P, Ca, Mg and on the total and marketable fruit yield. Increasing doses of AH reduced linearly the content of B and Cu (on S1), but increased the content of Zn in leaves. Humic acid doses of 31 to 49 L ha-1 provided the highest contents of Fe, Cu, and the lowest content of Mn. The highest marketable yields were obtained using coconut fiber, with an average of 5.6 kg/plant, showing an average yield increase of 22.9%, 38.7% and 49.7% in comparison to S2, S3 and S4, respectively.
Lycopersicon esculentum; humic acids; alternative substrates; coconut fiber; carbonized coffee husk
