Aspectos fisiológicos e crescimento inicial do maracujazeiro-amarelo sob lâminas de água e doses de fósforo.

Abstract

In order to evaluate the production of yellow passion fruit seedlings under irrigation depth and phosphorus levels based on growth and physiological variable. An experiment was realized under greenhouse conditions, where it was adopted a randomized block design with treatment arranged in a factorial scheme (5x5), relative to five irrigation depths (60, 80, 100 (test), 120 and 140% of ETr), and five levels of phosphate fertilization (60, 80, 100, 120 and 140% of the recommendation, relative to 180 mg of P2O5 dm³), with five replications and one plant by parcel. During the period of application of the treatments, from 10 until 55 days after sowing (DAS), it was evaluated, every 15 days, the growth variable, such as plant height (ALT), Stem diameter (DC) and number of leaves (NF), with these data, it was estimated relative growth rates for (ALT), (DC) and (NF), yet it was evaluated de stomatal conductance at 50 DAS and extravasation of electrolytes at 55 DAS. The bigger growth in stem diameter, plant high, and number of leaves it is obtained in plants V under depth of 140% ETr and phosphorus recommendation. Based on the growth variables, the increase in the phosphate fertilization levels optimizes water use, being able to irrigate with smaller depth when it is used phosphuros levels between 120 and 140% of recomendation; The increase in irrigation amouth and phosphorus level reduces the accumulation of salts in leaf tissue.