Morphophysiology of Eggplant Irrigated With Wastewater and Nitrogen and Phosphorus Doses in the Semi-arid Region of Brazil

Abstract

Water is a scarce resource in semi-arid regions, therefore, the correct water management is an essential practice. In this research we evaluated the use of nitrogen, phosphorus and treated wastewater on the growth and morphophysiology of eggplants (Solanum melongena L.) in the semi-arid region of Brazil. The experiment was conducted in Pombal, Paraíba, Brazil, using a randomized block design, in a 4 × 4 + 1 factorial scheme: wastewater with four nitrogen doses (N1 = 0.22; N2 = 0.39; N3 = 0.56; and N4 = 0.73 g N dm-3) and four doses of phosphorus (P1 = 0.96; P2 = 1.68; P3 = 2.40; and P4 = 3.12 g P dm-3), and the controls – distilled water fertilized with 0.56 g of N dm-3 and distilled water fertilized with 2.40 g of P dm-3. Each treatment was replicated 4 times. The nitrogen and phosphorous interaction did not influence the growth and physiological aspects of eggplant plants. Excess growing media nitrogen significantly decreased gaseous exchanges of eggplant plants, being found decreased of 4.4 μmol m-2 s-1 the CO2 assimilation.

Regulation of nitrogen balance and yield on greenhouse eggplant under biochar addition in Mollisol

“…Eggplant, one of the main vegetables cultivated in the greenhouse in China, has a long growth and fruiting period, and its vegetative growth and reproductive growth overlap (Keya et al 2020). Although vegetative growth is not equivalent to the formation of economic products, relatively speaking, the accumulation of dry matter formed during the vegetative growth stage not only controls the biological output, but also the economic output (Medeiros et al 2019). Soil fertility is the main source of plant nutrients, so the balanced application of nitrogen, phosphorus and potassium has a greater impact on the growth and yield of eggplant (Zhou et al 2020a, b).…”