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Universidade Federal Rural do Semi-Árido (2016)

Uso de esgoto doméstico tratado na produção de palma forrageira em assentamento rural do semiárido brasileiro

Lemos, Marcírio de

Titre : Uso de esgoto doméstico tratado na produção de palma forrageira em assentamento rural do semiárido brasileiro

Auteur : Lemos, Marcírio de

Université de soutenance : Universidade Federal Rural do Semi-Árido

Grade : DOUTORADO EM MANEJO DE SOLO E ÁGUA (2016)

Résumé
The population growth contributes to environmental crises by stressing water resources and their reuse is an essential component of their management. The crisis requires conservation practices with emphasis on the use of treated domestic sewage in the forage palm production. In this way, the application of domestic effluent to the soil and the growth and development of the Mexican elephant ear (Opuntia tuna (L.) Mill) palm was evaluated. The experiment was carried out in the Milagres settlement, in the municipality of Apodi-RN, cultivated in a randomized complete block design in subdivided plots 3 x (4 + 1), with 4 replicates, being three densities (d1 - 0.10 x 0.80 x 2.20 m 33,333 plants / hectare, d2 = 0.13 x 0.80 x 2.20 m 52,282 plants / hectare, d3 = 0.20 x 0.80 x 2.20 m 66,666 plants / Hectare) and four intervals between irrigation with fixed blade (3.5 mm per event) with water supply - AA and treated domestic sewage - EA, being (2.3 days AA and 7, 14 and 21 days AE) with 3.5 mm each and one control as dry. The plant height, total number, length, width, thickness and perimeter of cladodes, as well as the average growth of green matter (MV) per plant and total, and the percentage of dry matter (DM), were evaluated every 75 days, beginning after planting, and ending at 375 days after planting (DAP) ; and at the end of one year, soil nutrients were evaluated in the 0-20 and 20-40 cm layers and the average of the exported nutrients, which were submitted to regression and means tests. There was an effect (p<0.01) of the intervals between irrigation in most of the variables, resulting in higher plants, more numerous cladodes, and elevations in MV and MS growth. And there was still increase of P (2,3 days), PST and P (7 and 21 days) and PST (14 days) in the 0-20 cm layer of soil. Also increased Mg (2.3 days), PST, Na and P (7 and 21 days) and PST and Na (14 days) in the 20-40 cm layer. There was as well a (P 0,01) effect at interval between irrigation and planting density in the 0-20 cm layer, resulting in an increase in PST and Na (7, 14 and 21 days in D1, D2 and D3) and Ca (21 days on D2). And there was a significant effect of the intervals between irrigation at (P 0,01) and (P 0,05) on the nutrient export only for Ca, Mg, Mn and Zn, respectively, but generating a deficit of N, Ca, Mg, Mn and Zn and surplus of P, K, Fe, Co and Na in the soil after harvesting the forage palm

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