Observação ultra-estrutural de calos de ovários de Ingazeiro

O objetivo deste trabalho foi verificar as características ultra-estruturais de calos de ovários Inga vera Will subsp Affinis (DC). T.D. Penn.

Análise Ultra-estrutural de Calos de Anteras de Ingazeiro

O objetivo desse trabalho foi caracterizar as diferenças ultra-estruturais relacionadas à calogênese de anteras de Inga vera Willd. subsp. affinis (DC.) T.D. Penn

Concentração de sais do meio MS e ambiente de cultivo na indução de calos organogênicos de <i>Passiflora</i> <i>gibertii</i>

O objetivo deste trabalho foi determinar melhor concentração de sais do meio de cultura MS e ambiente de cultivo para organogênese indireta de maracujazeiro Passiflora gibertii

Agronomic efficiency of polymer-coated triple superphosphate in onion cultivated in contrasting texture soils

ABSTRACT Information related to phosphate fertilization and coated phosphate fertilizer in onion is scarce. Thus, this study was carried out to evaluate agronomic efficiency, production and nutritional characteristics of triple superphosphate coated with polymers in onion cultivated in contrasting texture soils. Two experiments were carried out under protected conditions in pots containing 5 kg soil. The experimental design was completely randomized with treatments arranged in a 2 x 5 factorial: triple superphosphate (TSP) and polymer-coated triple superphosphate (TSP+P) applied in five phosphorus rates: Dystroferric Red Latosol (LVdf) (clayey) = 0; 100; 200; 400; 800 mg P2O5 kg-1, and Quartzarenic Neosol (sandy) = 0; 75; 150; 300; 600 mg P2O5 kg-1, with three replications. Results indicated that polymer-coated TSP showed no difference for bulb mass and agronomic efficiency for phosphorus fertilization. Agronomic efficiency of phosphorus fertilization decreased with the increase in the amount of phosphorus applied. Phosphorus accumulation for onion bulb cultivated in Dystroferric Red Latosol (LVdf) was higher with the use of polymer-coated triple superphosphate. Growth, production and nutritional characteristics in onion were affected by phosphorus. The highest bulbs mass production and phosphorus accumulation occurred at the doses of 783; 629 mg kg-1 P2O5 (Dystroferric Red Latosol - LVdf), and of 406; 600 mg kg-1 P2O5 (Quartzarenic Neosol -RQ)

Productive characteristics, nutrition and agronomic efficiency of polymer-coated MAP in lettuce crops

In contrast to enhanced-efficiency nitrogen fertilisers, principally urea, phosphate fertilisers have been little studied and the available information is limited. The aim of this work therefore was to evaluate the productive and nutritional characteristics and the agronomic efficiency of a polymer-coated MAP fertilizer on two subsequent lettuce crops. The experiment was carried out in a greenhouse, in pots with a capacity of 4 kg, filled with a dystrophic yellow Latosol of a clayey texture. The experimental design was completely randomised and the treatments arranged in a 2 x 5 factorial scheme: two sources of phosphorus (P) (MAP and polymer-coated MAP), applied to the plots in five dosages (0, 100, 200, 400, 800 mg P2O5 kg-1) with three replications. The results showed that the polymer-coated MAP increased the efficiency of the phosphate fertilizer in both lettuce crops, improving utilisation of the residual phosphorus. The agronomic efficiency of fertilization decreases with the increases in applied phosphorus. The production and nutritional characteristics of the lettuce were influenced by the levels of P2O5 and the use of MAP with polymers. Higher values for dry and fresh weight and for the accumulation of P in the first crop occurred with the use of polymer-coated MAP at dosages of 506.9, 450.1 and 522.8 mg kg-1 P2O5

Calogênese em segmentos nodais de ingazeiro – aspectos ultra-estruturais

O objetivo desse trabalho foi caracterizar as diferenças ultra-estruturais relacionadas à calogênese de segmentos nodais de Inga vera Willd. subsp. affinis (DC.) T.D. Penn

Efeito da Água de coco na indução de calos organogênicos de <i>Passiflora</i> <i>gibertii</i> (Passifloraceae)

O objetivo deste trabalho foi determinar necessidade de água de coco para organogênese indireta de maracujazeiro Passiflora gibertii