COMPARATIVE ASSESSMENT OF THE NUTRITIONAL STATUS FOR BARU ( Dipteryx alata ) SEEDLINGS

Para o sucesso de um processo de revegeta\ue7\ue3o, al\ue9m de melhorar as condi\ue7\uf5es ed\ue1ficas da \ue1rea, deve-se dispor de mudas de boa qualidade, o que pode ser avaliado pelo estado nutricional. Neste trabalho, avaliaramse os teores foliares de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn e Zn de mudas de Dipteryx alata produzidas a pleno sol ou em cultivo protegido (30% de sombreamento), utilizando como substrato solo degradado, condicionado ou n\ue3o com res\uedduo org\ue2nico (32 t ha-1 macr\uf3fitas) e com diferentes doses de f\uf3sforo (0, 100, 200 e 300 mg dm-3 P2O5), comparativamente \ue0 mudas e parte a\ue9rea de plantas adultas, coletadas em campo. A cada coleta de folhas em campo, o solo foi coletado e analisado para P, MO, pH, K, Ca, Mg, H+Al, SB e CTC. A mesma an\ue1lise foi realizada nas unidades experimentais, ao final do experimento. Os resultados mostram que o Dipteryx alata \ue9 pouco exigente em P, que os teores foliares, nas mudas de campo, s\ue3o superiores \ue0s plantas adultas em N, P, K e S e inferiores para Ca e que o est\ue1dio de desenvolvimento da planta n\ue3o influenciou os teores foliares de Mg, B, Cu, Fe, Mn e Zn. O res\uedduo org\ue2nico n\ue3o foi suficiente para fornecer o N necess\ue1rio \ue0s mudas produzidas. O cultivo a pleno sol propiciou maiores teores foliares de N, P, Ca, Mg, B, Cu, Fe e Mn. Teores foliares de N, P, K, Ca, B, Fe e Zn foram superiores na presen\ue7a de res\uedduo org\ue2nico.To a successful revegetation process, besides improving the edaphic area conditions, seedlings must have good quality, which can be assessed by nutritional status. This research evaluated the foliar contents of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, and Zn from Dipteryx alata seedlings produced under full sun or protected condition (30% of shade), using degraded soil as substrate, with or without organic residue added (32 t ha-1 macrophyte) and with different phosphorus doses (0, 100, 200 e 300 mg dm-3 P2O5), comparatively to seedlings and adult plants collected in the field. To each leaf sampling in the field, the soil was collected and analyzed for P, MO, pH, K, Ca, Mg, H+Al, SB and CTC. The same analysis was performed in the experimental units at the end of the experiment. The data showed that the Dipteryx alata presents low P requirement. The foliar levels, in seedling from field were higher than in adult plants, for N, P, K, and S, and lower for Ca, and the plant\u2019s developing stadium did not affect the foliar levels of Mg, B, Cu, Fe, Mn and Zn. The organic residue was not enough to supplies the needed N to seedlings produced under experimental conditions. The cultivation under full sun provided higher foliar concentrations of N, P, Ca, Mg, B, Cu, Fe and Mn. The foliar levels of N, P, K, Ca, B, Fe and Zn were higher in the presence of organic residue