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Productivity of Eucalyptus camaldulensis affected by rate and placement of two phosphorus fertilizers to a Brazilian Oxisol

2000; Elsevier BV; Volume: 127; Issue: 1-3 Linguagem: Inglês

10.1016/s0378-1127(99)00121-8

1872-7042

José Quinto. Paredes Fernández., Luiz Eduardo Dias, Nairam Félix de Barros, Roberto Ferreira Novais, Érico J. de Moraes,

Soil Management and Crop Yield

This work evaluated the response of Eucalyptus camaldulensis to different sources, rates and placement of phosphate fertilizers. The trial was installed on an Oxisol in Brazil in the northwest of Minas Gerais State. Two sources were tested: rock phosphate (RP) from Araxá and single superphosphate (SSF) in rates equivalent to 100, 200 and 400 kg ha−1 P2O5, applied in bands (1.2 m of width in the soil surface) or in furrows (0.2 m deep in the tree rows). As additional treatments we tested a combination of RP (96 kg ha−1 P2O5), in furrows, or in bands, or broadcast (all the surface soil), with SSF (54 kg ha−1 P2O5) placed in the planting holes. The effects of the treatments were evaluated 9.5 years after planting by assessing the biomass and nutrient contents in the tree shoots, and litter. Fertilizer application increased tree stem volume and overall biomass compared to control plots (no-phosphate fertilizer). The RP and SSF produced better results when they were applied in furrows due to enhanced absorption of P by the plants that resulted in increased dry matter production. The placement in furrows also resulted in highest plant recovery rate of the P fertilizers applied. The combination of SSF, placed in the planting hole, with RP, applied in the furrow, produced the highest stem volume and shoot dry matter, emphasizing the influence of the initial fertilization on the final yield of the stand. The results showed that, considering the experiment period, the combined use of low and high solubility forms of P fertilizer in a localized placement may attend the high initial demand of P by the seedlings and provide a long term P availability to allow high productivity.