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Porteirinha, Brazil

Lopes O.P.,Federal University of Vicosa | Maia V.M.,State University of Montes Claros | Xavier A.A.,State University of Montes Claros | Da Costa M.R.,State University of Montes Claros | Rodrigues M.G.V.,EPAMIG URENM
Revista Brasileira de Fruticultura

In the irrigated area of Jaíba in Northern Minas Gerais, there are reports on the presence of some genotypes of banana cv. Prata-Anã supposedly tolerant to the Panama disease, where the disease was not established after 15 years of cultivation even in the presence of the pathogen. Therefore this study aimed to evaluate the genetic diversity, agronomic performance and behavior of genotypes of banana ‘Prata-Anã’ cultivated in area with a history of Panama disease. Twenty-four families were collected, 11 classified in the moment of the collection as diseased (GEN 1, GEN 2, GEN 3, GEN 4, GEN 5, GEN 6, GEN 7, GEN 8, GEN 9, GEN 10 and GEN 11), and 13 apparently healthy (GEN 12, GEN 13, GEN 14, GEN 15, GEN 16, GEN 17, GEN 18, GEN 19, GEN 20, GEN 21, GEN 22, GEN 23 and GEN 24). This material were multiplied in tissue culture laboratory and taken to planting at the experimental area. Twenty-four treatments were evaluated (clones of banana ‘Prata-Anã’), in a randomized block design with three replications, 20 plants per plot and the central six in useful area. In addition to the genetic diversity, length and diameter of pseudostem, leaf number, bunch, hands and rachis weight, number of hands and fruits, length and girth of the central fruit of the second hand, the percentage of dead plants, incidence and severity of Panama disease were evaluated. The average genetic distance between clones was 43.5%, ranging from 11.8% to 85%. Individuals GEN 12, GEN 13, GEN 19 and GEN 22 showed larger pseudostem at ground level and at 30 cm above the ground, and were higher. Individuals GEN 13, GEN 17 and GEN 19 stood out in both production cycles as Panama disease tolerant. © 2014, Sociedade Brasileira de Fruticultura. All rights reserved. Source

Miranda J.H.,University of Sao Paulo | Bergamo L.R.,Empresa Dedini | Reis J.B.S.,EPAMIG URENM | Cruciani D.E.,University of Sao Paulo | Duarte S.N.,University of Sao Paulo
Engenharia Agricola

The application of fertilizers in agriculture produce some solute displacement below the root zone and this situation has provoked great impacts, besides the economic damages, causing groundwater contamination. The present work has as the objective of monitoring the displacement process of the potassium (K+) in lysimeters filled with soil, sandy texture and cultivated with peanuts (Arachis hypogaea L.) under different conditions of reducing solar radiation by using plastic films with different thickness (100 and 150 μ). The potassium displacement was monitored by soil solution extractors installed in different depths (15 and 25cm) and the fertigation management was accomplished by tensiometers. It was concluded that low incident solar radiation in the two environments with plastic coverings negatively affected peanut's yield; the period that the peanut demands larger amount of potassium happens from 30 to 55 days after sowing; peanut plants did not present nutritional deficiency with a smaller leaching of K+ for the deepest layers of soil; in the lysimeters with plastic covering of 100 and 150 micras occurred a larger concentration of K+ in the soil surface. Source

The objective of the present study were to estimate the rates of K to obtain the maximum physical and economic efficiency, determine the critical level of leaf K and to relate the nutritional balance of banana 'Prata Anã' with the incidence of plants with Panama disease in the 4th cycle. The experiment was conducted in an oxisol, medium texture, in the semi-arid region in the northern of the State of Minas Gerais, Brazil. The treatments consisted of four rates of K (0, 400, 800 and 1200 kg ha-1 yr-1 of K2O.) These were distributed in randomized blocks with five replications. Fertilization with K increased the production of banana in the 4th cycle. The maximum physical efficiency (31.0 Mg ha-1) and economic (30.5 Mg ha-1) were obtained with the application of 969 and 707 kg ha-1 yr-1 of K2O, respectively. The critical levels of leaf K obtained were 29.5 and 27.1g kg-1 for the maximum physical efficiency and economic, respectively. The increase in rates of K provided a better nutritional balance in the banana and reduced the percentage of plants infested with Panama disease. Source

Rodrigues M.G.V.,EPAMIG URENM | Pacheco D.D.,Instituto Federal Of Educacao | Natale W.,Sao Paulo State University | da Silva J.T.A.,EPAMIG URENM | Dias M.S.C.,EPAMIG URENM
Revista Brasileira de Fruticultura

In the North of Minas Gerais it is cultivated basically 'Prata-Anã' banana, a cultivar that requires mainly Zn. The possibility of zinc supply, without this nutrient getting in contact with the soil, it is important for the region, since several factors take to the low availability of the element supplied by the soil, as: elevated organic matter content on the surface (from cultural residues); maintenance of high pH of the soil - above 6,00 - as strategy contrary to the proliferation of the causal agent of the Fusarium Wilt; frequent fertilizations with potassium and magnesium that, besides converting the medium into base, they reduce the participation of Zn in the balance cation/anion of the soil, hindering the absortion of this micronutrient by the plant. For determining the distribution of biomass and minerals in the 'Prata-Anã' banana, cultivated under irrigation in the North of Minas Gerais, when the zinc was supplied through thinned sprout, an experiment was carried out in the Irrigated Perimeter of Jaíba. The plants were fertilized with 0,00; 1,66 and 3,33 g.family-1 of Zn, through thinned sprout. One month after the fertilizations from October 2007 and February 2008, the production of fresh mass (FM) and dry mass (DM) were evaluated, the contents and meanings of minerals in all the bananas "family" bodies composed by mother-plant with bunch + tall daughter-plant + granddaughter-plant. The doses of Zn did not influence on the production of FM and DM of the plants in the first evaluation, while in the second evaluation positive effect of the treatment was observed just for MF accumulated in the inferior leaves, in the portions of the medium third and inferior of the pseudostem, and in the mother-plant's rhizome. As much the content as the accumulation of nutrients in the mother-plants presented the following decreasing order: K > N > Ca > Mg > P > S > Fe > Zn > B > Cu. The Zn contents were affected by the dose of that micronutrient in the most of the studied situations. The zinc supplied through thinned sprout increased in the mother-plant, and then it was redistributed in the banana's "family". Source

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