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São Francisco de Assis, Brazil

Martins A.N.,APTA Medio Paranapanema | Furlaneto F.P.B.,APTA Centro Oeste | Dias N.M.S.,University of Sao Paulo | Suguino E.,APTA Centro Leste
Revista Brasileira de Fruticultura | Year: 2010

Brazil is in the fourth ranking position in the banana producing countries. The state of Sao Paulo accounts for approximately 17% of the national production. The areas of banana production, but restricted to the coastal strip of the state, are expanding and occupying regions of the Sao Paulo plateau. To achieve high yields, with fruit quality of banana, growers are adopting new technologies and the fertirrigation has been occupying a prominent place in the new production systems. In order to assess the economic viability of the use of potassium in different doses (0; 300; 600 e 900 kg K2O.ha-1.ano-1) in experimental planting in the Middle Paranapanema, in the state of São Paulo, were estimated values of the production cost and economic indicators, such as Total Operating Cost (TOC), Net Revenue and Profitability Index, of systems fertirrigated in the banana crop. According to the methodology, the use of potassium in dose of 900 kg K2O.ha-1.ano-1, applied through fertirrigation system can be recommended for banana planting, 'Willians' cultivar, in the Middle Paranapanema, state of Sao Paulo.

An efficient pasture use in intensive production systems depends on the balanced mineral nutrition of the forage plant. Our objective was to evaluate changes in potassium, calcium and magnesium concentrations of Brachiaria brizantha, cv. Marandu grown on an Entisol with nitrogen and sulfur rates. The experiment was carried out in a greenhouse, in Piracicaba, State of São Paulo, from December 2004 to April 2005. A randomized block design was used in a fractionated 5 x 5 factorial design with 13 N and S rate combinations. The experimental units consisted of 3.6 dm-3 plastic pots containing five Marandu plants. The grass plants were harvested three times and the shoot and its components separated in each ocasion. N fertilization influenced Ca and Mg concentrations as well as the proportions of K, Ca and Mg in the above-ground part of Marandu palisadegrass. The combined fertilization with N and S influenced K concentration negatively in the diagnostic leaves of the grass. Applications of N and S soil prior to Marandu establishment altered the nutritional balance in Ca, Mg and K of the plant.

Salla D.A.,SEAPROF | Furlaneto F.P.B.,APTA Medio Paranapanema | Cabello C.,Sao Paulo State University | Kanthack R.A.D.,APTA Medio Paranapanema
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010

This work aimed to analyze the energetic consumption of the etanol production system, using the cassava as carbohidrates source. The researches were carried out from the field in the mid region of Paranapanema river, Sao Paulo state, during the period January to December, 2007. The energy consumption referring to the phases of crop production and industrial processing were appraised. It was verified that the total energetic cost of the crop production corresponded to 9,528.33 MJ ha-1, and the most onerous item was the inputs (35.72%). In the industrial step, the energetic consumption was equivalent to 2,208.28 MJ t-1. The operations of hydrolysis/saccharification/ treatment of the juice represented 56.72% of the total energetic expenditure. The cassava crop presented an energetic cost of 1.54 MJ L-1 in relation to the etanol produced in the main agronomic operations crop production, and 11.76 MJ L-1 in the industrial processing. The energy efficiency observed in the cultivation and industrialization of the cassava was of 1.76.

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