Ivomberg Dourado Magalhães

CARACTERÍSTICAS BIOMÉTRICAS E ACÚMULO DE FITOMASSA DA BERINJELEIRA SOB IRRIGAÇÃO COM ÁGUA RESIDUÁRIA E DOSES DE NITROGÊNIO E FÓSFORO

A agua na regiao semiarida e um dos recursos naturais com maior escassez, sendo imprescindivel o seu manejo correto e a pratica do reuso. Neste contexto, propos-se avaliar o uso de nitrogenio e fosforo junto com agua residuaria domestica pos-tratada em filtro de areia com fluxo intermitente sobre os aspectos de crescimento e acumulo de fitomassa de plantas de berinjela cultivadas em casa de vegetacao no semiarido paraibano. O experimento foi conduzido no municipio de Pombal, Paraiba, utilizando-se o delineamento experimental inteiramente casualizado, em esquema fatorial 4 x 4 + 1, com quatro repeticoes, sendo quatro doses de nitrogenio (N1 = 0,22; N2 = 0,39; N3 = 0,56 e; N4 = 0,72 g dm-3 de solo) e quatro doses de fosforo (P1 = 0,96; P2 = 1,68; P3 = 2,40 e; P4 = 3,12 g dm-3 de solo) e irrigacao com agua residuaria. Adicionou-se um tratamento com 100% da adubacao com N, P e irrigacao com agua de abastecimento. A interacao entre as doses de nitrogenio e fosforo nao influenciou os aspectos de crescimento e acumulo de fitomassa da berinjeleira. O aumento unitario das doses de fosforo promoveu acrescimos de 0,13% no numero de folhas da berinjela quando irrigada com agua residuaria. A dose estimada de nitrogenio de 0,43 g dm-3 e irrigacao com agua residuaria resultou em maior altura de plantas. As maiores doses de nitrogenio promoveram decrescimos significativos sobre o acumulo de fitomassa da berinjeleira.

Opuntia ficus-indica (L.) Mill. (Cactaceae) in Climate Change Scenarios and Its Potential for Wastewater Bioremediationin Semi-Arid Regions: A Systematic Review and Meta-Analysis

Department of Agricultural Engineering, Federal University of Campina Grande, CEP: 58429-140, Campina Grande, Paraíba, Brazil. Department of Animal Science, Federal University of Campina Grande, CEP: 58708-110, Patos, Paraíba, Brazil. Department of Agriculture, Federal Institute of Education, Science and Technology of Alagoas, CEP: 57500-000, Santana do Ipanema, Alagoas, Brazil. Department of Soil Science, Federal University of Paraiba, CEP: 58397-000, Areia, Paraíba, Brazil. Department of Plant Production, Federal University of Alagoas, CEP: 57072-900, Maceió, Alagoas, Brazil. Department of Soils and Fertilizers, Paulista State University, CEP: 14884-900, Jaboticabal, São Paulo, Brazil.

Nutritional status of orange tree ‘Pêra Rio’ variety after Huanglongbing disease infection, leaf spray fertilization and application of resistance-inducing bioinductors

Citrus industry is widespread in the world. The Huanglongbing is an important disease of citrus species and has been spread around the world. This research analyzed the nutritional status of tree ‘Pêra Rio’ variety infected with Candidatus Liberibacter spp., under leaf nutrients spray and bioinductors of resistance. The experiment was carried out from September 2013 to June 2014, in a citrus commercial orchard located in the city of Ibitinga (SP). A completely randomized design was used in a factorial 3 × 4 × 6, consisting of three plants status (healthy, infected with asymptomatic HLB, and symptomatic HLB), four rates of spray solutions (0, 2, 4 and 6 L ha), six application stages (A1, A2, A3, A4, A5, and A6 with intervals of 45 days between each stage) and four replications. Macro and micronutrients leaf levels were quantified. Data were submitted to exploratory factor analysis with multivariate statistics. Three factors were extracted from the variables, namely, Factor 1 formed by variables S, Cu, Fe, and Zn; Factor 2 by N, K and B, and Factor 3 by Ca, Mg, and Mn. ‘Pêra Rio’ plants nutritional status was destabilized with the infection of Candidatus Liberibacter spp. Progressive treatment with leaf fertilization and resistance bioinductors temporarily re-established nutritional standards of plants affected by Huanglongbing but did not promote stability of the plants nutritional status.