Crescimento E Alocação De Fitomassa Do Quiabeiro Submetido À Doses De Nitrogênio E Irrigação Com Água Residuária

Abstract

RESUMOA produção agrícola na região semiárida é limitada pela escassez hídrica, onde, a prática da irrigação é uma das principais tecnologias usada para assegurar o crescimento e a produção das plantas. Neste sentido, objetivou-se avaliar o efeito de diferentes doses de nitrogênio associado à irrigação com água residuária doméstica pós-tratada em filtro de areia com fluxo intermitente, sobre o crescimento e alocação de fitomassa do quiabeiro cv. Santa Cruz, cultivado em região semiárida da Paraíba. O experimento foi conduzido no município de Pombal, Paraíba, no período de fevereiro a setembro de 2014, utilizando-se o delineamento experimental em blocos casualizado, com quatro repetições. Os tratamentos resultaram em seis doses nitrogênio (N1 = 0; N2 = 40; N3 = 80; N4 = 120; N5 = 160; e N6 = 200 kg ha -1 ) correspondendo, respectivamente, a 0; 25; 50; 75; 100 e 125% da recomendação de adubação para a cultura do quiabo, e irrigação com água residuária. Foram avaliadas as variáveis de crescimento e fitomassa das plantas. O quiabeiro mesmo sendo considerada uma cultura rústica, responde as aplicações de nitrogênio quando cultivado sob condições edafoclimáticas do semiárido paraibano. Palavras-chave:Abelmoschus esculentus L., adubação nitrogenada, reuso de água.

Growth Rate of Eggplant Under Nitrogen and Phosphate Fertilization and Irrigated With Wastewater

“…However, nitrogen excess acidifies the soil. Due to the high doses of nitrogen fertilizer and the use of wastewater it is possible that acidification may have occurred in our experiment and promoted a nutritional imbalance and toxic effect on the plants (Medeiros et al, , 2018b. Also, phosphorus excess results in low efficiency of its use, cause serious environmental consequences and may accelerate the depletion of its mineral reserves (Hasan, Hasan, Teixeira da Silva, & Li, 2016).…”

“…Tak, Ahmad, Babalola, and Inam (2012) report that wastewaters have a large concentration of essential nutrients to maintain soil fertility, as well as to increase growth and plant productivity. The concentration of nutrients of wastewater is important for agriculture, and when used correctly, can meet the needs of water by plants and reduce the demand for fertilizers contributing to the preservation of the environment (Iqbal et al 2015;Medeiros et al, 2018b).…”

“…The reuse of treated wastewater in irrigation is a practical solution to deal with water scarcity, especially in arid and semi-arid regions (Al-Jaboobi et al, 2014;Medeiros et al, 2018a). However, other cultivation practices should be associated such as the care with nutrition (Khaleel, Ismail, & Ibrahim, 2013;Gatta et al, 2015;Medeiros et al, 2018b) because several nutrients are present in the wastewater, such as nitrogen and phosphorus (Medeiros et al, 2018a). Therefore, it is important to take into account the adequate amount of nutrients required by crops irrigated with wastewater.…”

“…However, there are no reports of phosphorous addition associated with wastewater in the literature. Different nitrogen doses are recommended for other cultures, for example, 135 kg ha -1 for sunflower (Ali & Noorka, 2013) and 200 kg ha -1 for common bean (Ribeiro, Leite, Costa, Albuquerque, & Mielezrski, 2018) and okra (Medeiros et al, 2018a(Medeiros et al, , 2018b. It is needed, however, to quantify the ideal phosphorus doses because its deficiency affects the physiological metabolism of plants, such as gas exchange and, consequently, growth and production (Hernández & Munné-Bosch, 2015;Veronica et al, 2017).…”

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

“…To reduce water scarcity in Brazil's semi-arid region, researchers search for viable alternatives, such as the use of "inferior quality" water in irrigated agriculture, mainly saltwater and wastewater (Gonçalves et al, 2013;Oliveira et al, 2014;Lima et al, 2014Lima et al, , 2015Medeiros et al, 2015Medeiros et al, , 2018bSantos et al, 2016).…”