PRODUTIVIDADE E TEOR DE NUTRIENTES EM PALMA FORRAGEIRA IRRIGADA COM EFLUENTE DE ESGOTO DOMÉSTICO MANOEL SIMÕES DE AZEVEDO JÚNIOR1; MIGUEL FERREIRA NETO1; JOSÉ FRANCISMAR DE MEDEIROS1; FRANCISCO VANIES DA SILVA SÁ1; YURI BEZERRA DE LIMA1 E MARCÍRIO DE LEMOS1 1 Centro de Ciências Agrárias, Universidade Federal Rural do Semi-Árido - UFERSA, R. Francisco Mota, 572 - Presidente Costa e Silva, 59625-900, Mossoró - RN, Brasil. E-mail: mjunior721@yahoo.com.br, miguel@ufersa.edu.br, jfmedeir@ufersa.edu.br, vanies_agronomia@hotmail.com, yuribzdlima@hotmail.com, marcirio@hotmail.com 1 RESUMO Objetivou-se com esse trabalho avaliar, no segundo ciclo, a produtividade de biomassa e os teores de nutrientes da palma forrageira orelha-de-elefante, conduzida sob irrigação complementar, com esgoto doméstico tratado. O experimento foi realizado no Assentamento Milagre, município de Apodi/RN, no período de junho de 2016 a fevereiro de 2017. Foram estudados cinco tratamentos, sendo quatro frequências de irrigação (2,3; 7; 14 e 21 dias), sendo aplicado uma lâmina de 3,5 mm de efluente, e uma testemunha, cultivo em sequeiro (sem irrigação). Utilizou-se delineamento experimental de blocos casualizados com quatro repetições. Após 234 dias do 1º corte realizado na palma, foram estimadas as produtividades de massa fresca e massa secas, assim como, determinado os teores de macro e micronutrientes na biomassa seca da palma forrageira. A complementação hídrica realizada por irrigação com intervalos de 2,3; 7,0; 14,0 e 21,0 dias, viabilizou satisfatoriamente a produção de biomassa da palma forrageira. A complementação hídrica de 3,5 mm por irrigação com efluente de esgoto doméstico tratado, com intervalos de 2,3 e 7,0 dias promove a maior produtividade da palma forrageira orelha de elefante mexicana. O efluente de esgoto doméstico tratado é viável para irrigação e fertirrigação da palma forrageira, carecendo da suplementação mineral adicional com fósforo, cálcio e zinco. Palavras-chave: Irrigação, forragem, Opuntia sp., reuso de água. AZEVEDO JÚNIOR, M. S.; FERREIRA NETO, M.; MEDEIROS, J. F.; SÁ, F. V. S.; LIMA, Y. B.; LEMOS, M. PRODUCTIVITY AND NUTRIENT CONTENT OF FORAGE CACTUS IRRIGATED WITH DOMESTIC SEWAGE EFFLUENT 2 ABSTRACT The aim of this work was to evaluate, in the second cycle, biomass productivity and nutrient content of Mexican Elephant Ear forage cactus, conducted under complementary irrigation, with treated domestic sewage. The experiment was carried out at Settlement Milagre, municipality of Apodi-RN, from June 2016 to February 2017. Five treatments were studied, four irrigation frequencies (2.3, 7, 14 and 21 days) a 3.5 mm death of effluent, and a control, rainfed cultivation (without irrigation). A randomized complete block design with four replicates was used. After 234 days of the first cut in the palm, green and dry mass yields were estimated, as well as the macro and micronutrient contents in the dry cactus biomass. Water supplementation performed by irrigation with intervals of 2.3, 7.0, 14.0 and 21.0 days, allowed satisfactory production of the forage cactus biomass. The water supplementation of 3.5 mm by irrigation with treated domestic sewage effluent, with intervals of 2.3 and 7.0 days, promotes higher productivity of forage cactus mexican elephant ear. The treated domestic sewage effluent is feasible for irrigation and fertigation of forage cactus, lacking additional mineral supplementation with phosphorus, calcium and zinc. Keywords: Irrigation, forage, Opuntia sp., Water reuse.
This study aimed to evaluate, in the second cycle, the growth and production of ‘Orelha-de-elefante Mexicana’ prickly pear (Opuntia sp.) under complementary irrigation with treated domestic sewage. The experiment was carried out in the Milagre Settlement, municipality of Apodi-RN, Brazil, from June 2016 to February 2017. Five treatments were evaluated, corresponding to four irrigation frequencies (2.3, 7.0, 14.0 and 21.0 days) to apply an effluent depth of 3.5 mm, and the control, rainfed cultivation (without irrigation). The experimental design was randomized blocks, with four replicates. After preliminary-primary treatment, the domestic sewage showed acceptable chemical and physical characteristics for fertigation under the conditions adopted in the prickly pear cultivation. 234 days after the 1st cut in the plants, the following morphometric characteristics were measured: plant height and length, width, perimeter, thickness and number of primary and secondary cladodes, and biomass accumulation. Complementary irrigation with treated domestic sewage effluent applied at intervals of 2.3, 7.0, 14.0 and 21.0 days allowed satisfactory growth and production of ‘Orelha-de-elefante Mexicana’ prickly pear; without irrigation, its development was substantially hampered during the dry period. Complementary irrigation with 3.5 mm of domestic sewage effluent applied at intervals of 2.3, 7.0 and 14.0 days led to highest growth and biomass accumulation in ‘Orelha-de-elefante Mexicana’ prickly pear.
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