Efeito de diferentes doses de silício, nitrogênio e potássio na incidência da traça-do-tomateiro,pinta-preta e produtividade do tomate industrial

AUTOR(ES)

Marília Cristina dos Santos

DATA DE PUBLICAÇÃO

2008

RESUMO

Tomato production is at second place among vegetable crops in Brazil in economical relevance. This crop is exposed to many pests that limit yield. The aim of this research was to evaluate silicon, nitrogen and potassium effect on blight infection, tomato pinworm injuries and yield. The experiment was carried out at FAL- UnB in a completely randomized design, with 14 treatments (control - no fertilization; 2, 4, 6 and 8 kg.ha-1 of SiO2; 60, 120, 180 e 240 kg.ha-1 of nitrogen; 100, 200, 300 e 400 kg.ha-1 of K2O.; NPK according to soil analyses), 3 genotypes (Viradoro, Tospodoro and HEI 035) in 4 replicates, in a total of 168 parcels. A MAPA norm was used to evaluate yield and classify fruits. Pinworm leaf mines and blight damage were evaluated five times during crop cycle. The lowest fertilizers doses in each nutrient resulted in the highest yield of adequate tomato fruits for processing. EH showed the lowest discolored and insect damaged fruits, statistically different from those observed on the other genotypes. Nevertheless, HEI 035 showed the highest fruit number with black heart disorder, statistically different from Tospodoros result, which was the lowest. The highest number of cracked fruits in each nutrient dose was observed at the lowest dose, and did not differed statistically from control, but differed from NPK that showed the lowest result. HEI 035 showed the highest number of blossom-end rot fruits. It was observed a decrease in the number of pinworm leaf mines with an increase in silicon and potassium doses and an increase in the number of mines with an increase on nitrogen doses. Blight damage increased during crop development, possibly, due to increases on temperature and relative humidity during crop cycle. It was not observed a significant effect o silicon, nitrogen and potassium on blight control.

ASSUNTO(S)

ciencias agrarias production lycopersicon esculetum alternaria solani lycopersicon esculetum tuta absoluta tuta absoluta injúrias injuries adubação produção fertilization alternaria solani

Documentos Relacionados

• Efeito da adubação sobre a incidência de traça-do-tomateiro e alternaria em plantas de tomate
• Efeito da poda de mudas na produtividade do tomateiro industrial.
• Produtividade do tomateiro em função de fontes e doses de silício
• Efeito da aplicação de diferentes lâminas de irrigação e doses de nitrogênio e potássio na produção do capim Tanzânia
• Absorção de silício, produtividade e incidência de Diatraea saccharalis em cultivares de cana-de-açúcar