ABSTRACT Golden mussel is an invasive species in South America that causes environmental and economic damage due to the formation of large colonies without natural predators. This study aimed to test the agricultural use of golden mussel shell as a limestone substitute, as the shell is rich in calcium carbonate. The experiment was carried out in pots, with eight treatments (sandy soil; clay soil; sandy soil + 1.0 Mg ha−1 of limestone; clay soil + 1.0 Mg ha−1 of limestone; sandy soil + 1.0 Mg ha−1 of fresh shell; clay soil + 1.0 Mg ha−1 of fresh shell; sandy soil + 1.0 Mg ha−1 of calcined shell; clay soil + 1.0 Mg ha−1 of calcined shell), in addition to the application of the following fresh and calcined shell doses: 0, 1.0, 1.5 and 2.0 Mg ha−1. Rice was cultivated in all treatments, and the soil fertility and rice shoot and root dry masses were evaluated. The shell provided good chemical conditions to the soils and raised their pH and phosphorus and calcium contents. The agricultural use of golden mussel shell showed to be efficient for soil correction and can be considered an alternative to limestone.

RESUMO O mexilhão-dourado é uma espécie invasora na América do Sul que causa prejuízos ambientais e econômicos, devido à formação de grandes colônias sem predadores naturais. Objetivou-se testar o uso agrícola de carapaça de mexilhão-dourado como substituto ao calcário, já que é rica em carbonato de cálcio. O experimento foi conduzido em vasos, com oito tratamentos (solo arenoso; solo argiloso; solo arenoso + 1,0 Mg ha−1 de calcário; solo argiloso + 1,0 Mg ha−1 de calcário; solo arenoso + 1,0 Mg ha−1 de carapaça in natura; solo argiloso + 1,0 Mg ha−1 de carapaça in natura; solo arenoso + 1,0 Mg ha−1 de carapaça calcinada; solo argiloso + 1,0 Mg ha−1 de carapaça calcinada), além da aplicação das seguintes doses de carapaça in natura e calcinada: 0; 1,0; 1,5; e 2,0 Mg ha−1. Cultivou-se arroz em todos os tratamentos e foram avaliadas a fertilidade do solo e a massa seca da parte aérea e das raízes do arroz. A carapaça proporcionou boas condições químicas aos solos, elevou o seu pH e os teores de fósforo e cálcio. A utilização agrícola da carapaça de mexilhão-dourado foi eficiente para a correção do solo e pode ser considerada uma alternativa ao calcário.

Abstract Dipteryx alata is an arboreal species found in the Brazilian Savannah (BS), that has potential human and animal uses, including nutrition, medicine, and revegetation. This study aimed to evaluate the nutritional status and growth of D. alata seedlings used to recover degraded soils to which residues had been added compared to seedlings grown in the BS. The degraded soil was treated with organic and agroindustrial residues. Twelve months after seedlings were introduced, they were evaluated for height, stem diameter, chlorophyll index, and concentration of foliar macro and micronutrients. The foliar concentration was determined for D. alata seedlings grown in the degraded area and BS. The addition of residues increased foliar concentration of seedlings grown in the degraded area; however, concentrations did not reach similar levels to seedlings grown in BS. D. alata accumulated Mn in plants. The height and stem diameter of seedlings responded positively to residue application.

Para o sucesso de um processo de revegetação, além de melhorar as condições edáficas da área, deve-se dispor de mudas de boa qualidade, o que pode ser avaliado pelo estado nutricional. Neste trabalho, avaliaram-se 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 não com resíduo orgânico (32 t ha-1 macrófitas) e com diferentes doses de fósforo (0, 100, 200 e 300 mg dm-3 P2O5), comparativamente à mudas e parte aérea 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 análise foi realizada nas unidades experimentais, ao final do experimento. Os resultados mostram que o Dipteryx alata é pouco exigente em P, que os teores foliares, nas mudas de campo, são superiores às plantas adultas em N, P, K e S e inferiores para Ca e que o estádio de desenvolvimento da planta não influenciou os teores foliares de Mg, B, Cu, Fe, Mn e Zn. O resíduo orgânico não foi suficiente para fornecer o N necessário às 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 presença de resíduo orgânico.

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's 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.