Crescimento, produtividade e qualidade de raízes de rabanete cultivadas sob diferentes fontes e doses de adubos orgânicos

Abstract

Growth, productivity and quality of radish roots cultivated under different sources and doses of organic fertilizers This experiment was carried out in Jaboticabal, São Paulo State, Brazil, between August and September 2002, to evaluate the effect of different vermicompost doses and cattle manure on growth, yield and quality of radish roots (Raphanus sativus L.), cultivar Crimson Giant. Direct sowing of the radish was followed by thinning nine days after, adjusting the spacing to 0.20 x 0.08 m. A randomized blocks experimental design was used, with seven treatments (15; 30 and 45 t ha-1 of earthworm humus or cattle manure, and a control without fertilizer addition), in three replications. There was higher dry mass accumulation in the leaves than in other organs, with continuous accumulation until 13 days after sowing, with further reduction, when the root development occurred. Doses and sources of organic fertilization slightly influenced growth, total productivity and quality of commercial roots. Earthworm humus reduced the percentage of cracked and spongeous roots in the doses of 9.2 and 20.4 t ha-1 , respectively. Doses of 21.3 t ha-1 of cattle manure promoted the highest percentage of cracked roots, while the dose of 45 t ha-1 reduced this percentage, when compared to the use of 15 t ha-1 .

Hydroponic cultivation of Physalis angulata L.: growth and production under nitrogen doses1

“…This was not observed in the present study, given that the dosage that produced the greatest height and relative growth rate also resulted in a higher leaf area ratio. The leaf mass ratio is a physiological component that represents the ratio between the dry mass retained in the leaves and the dry mass accumulated in the entire plant, reflecting how much of what the plant invested in its production, via photosynthesis, remained in the leaf (Costa et al 2006). The leaf mass ratio values behaved similarly to those of leaf area ratio, with a decline observed in plants submitted to the largest N dose applied (R² = 0.96) and the greatest retention of photosynthesized leaf material at a dose of 187.5 mg L -1 (Figure 2d).…”

Desempenho de cultivares de cenoura em função da água no solo

“…De acordo com Costa et al (2006) variações de umidade e temperatura no solo durante o desenvolvimento das plantas podem prejudicar a produtividade e a qualidade das raízes. Kumar et al (2007), também encontraram comportamento semelhante para a classificação de bulbos de cebola em função da irrigação; segundo eles, a porcentagem de bulbos em padrão comercial foi obtida nos tratamentos em que foram aplicados os maiores níveis de irrigação refletindo, assim, que a umidade influencia diretamente na menor percentagem de bulbos tipo refugo.…”

Cattle manure and N-urea in radish crop (Raphanus sativus)

“…Costa et al (2006) reported a high incidence of this disturbance when using worm humus and cattle manure.…”