Concentração foliar de nutrientes e produtividade de tomateiro cultivado sob diferentes substratos e doses de ácidos húmicos

Abstract

Leaf nutrient content and yield of tomato grown in different substrates and doses of humic acidsWe 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 nonmarketable 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.

Organic compost addition to raw rice husk substrate for tomato (<i>Solanum lycopersicum</i>) hybrid variety cultivation in a leach recirculating system

“…Other studies using soilless cultivation systems reported a production of 3.3 kg/plant for both the Monte Carlo variety grown in organic substrate (Plantmax ® Company, Brazil) (Rattin et al, 2003) and the Santa Clara variety grown in a hydroponic system (Genuncio et al, 2010). Lima et al (2011) obtained a fruit yield of 5.7 kg/plant for the Venus variety grown in a coconut fiber substrate.…”

Characterization of processing tomato lines as the physiological and production characteristics

“…These authors found a higher calcium and magnesium extraction the leaves respectively corresponding to 0.405 g and 2.603 g per plant. Lima et al (2011) evaluating the foliar concentration of nutrients in tomato plants grown under different substrates and humic acid levels observed average of 7.1 g kg -1 sulfur sheets. Even with the application ammonium sulfate cover containing 21% N and 24% S, it was found that the S content obtained in this study were lower, and are not within the standard concentration deemed appropriate for the tomato, 3 to 10 g kg -1 (EMBRAPA, 2009).…”

Produtividade da alface (Lactuca sativa L.) em resposta à aplicação de ácidos húmicos e bactérias diazotróficas, em condições de campo

“…Essas bactérias apresentam fitormônios que estimulam o crescimento e desenvolvimento vegetal (Baldotto et al, 2010;Enders & Strader, 2015). Essas propriedades dos AH e das bactérias diazotróficas podem possibilitar desenvolvimento mais rápido e maior produtividade das plantas, reduzindo custos com adubação e o tempo de produção dos cultivos (Lima et al, 2011;Canellas & Olivares, 2014). Experimentos conduzidos em casa de vegetação comprovam essa eficiência no cultivo de milho (Conceição et al, 2008;Canellas et al, 2013), abacaxi (Baldotto et al, 2010) e tomate (Olivares et al, 2015).…”