Response of snap bean to P2O5 levels applied in a poor phosphorus sandy soil

• Autor(es):

  Oliveira, Ademar P. de (Universidade Federal de Pernambuco. Centro de Ciências Agrárias);

  Cardoso, Marinice O. (Universidade Federal de Pernambuco. Centro de Ciências Agrárias);

  Barbosa, Luciano J.N. (Universidade Federal de Pernambuco. Centro de Ciências Agrárias);

  Silva, José Elenilson L. da (Universidade Federal de Pernambuco. Centro de Ciências Agrárias);

  Morais, Martival dos S. (Universidade Federal de Pernambuco. Centro de Ciências Agrárias).

• Fonte:

  Horticultura Brasileira; volume 23, número 1, páginas 128-132. Março 2005.

• Assuntos:

  Phaseolus vulgaris L.;

  nutrition;

  quality;

  yield.

• Resumo:

  This research was carried out to evaluate the responses of snap bean 'Macarrão Trepador' cultivated under different P2O5 levels. An experiment was carried out using a randomized blocks design with four replications in a soil classified as Neossolo Regolítico Typical Psamítico, in Areia, Paraiba State, Brazil, from May to September/2002. The P2O5 levels applied were 0; 100; 200; 300 and 400 kg ha-1. The plot consisted of 60 plants, with spacings of 1.00 m x 0.20 m. The maximum number of pods in a plant (22 pods) was obtained using 267 kg ha-1 of P2O5 level. The maximum estimated value of the production of pods (30.13 t ha-1) was obtained at the level of 252 kg ha-1 of P2O5. However, the most economic level was reached with 231 kg ha-1 of P2O5, which produced 30 t ha-1 of pods. The P2O5 levels resulting in the maximum production and economic return of pods were correlated respectively, with 54 and 51 mg dm-3 of available P obtained with Melich 1, extractor. The probability of response of the snap bean to the phosphate fertilization in similar soils will be minimized if the level of available P in the soil was superior to 51 mg dm-3. A decreasing linear function was verified for the fiber content, with reduction of 0.0004% of fiber for each kg of P2O5, applied to the soil, with maximum value (1.1%) and minimum (0.94%) under the levels zero and 400 kg ha-1 of P2O5, respectively. For the type of soil utilized in the present study, the application of 231 kg ha-1 of P2O5 is recommended for the fertilization of snap beans.

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