ABSTRACT Campomanesia adamantium (Cambess.) O. Berg (guavira) is a native plant of the Cerrado and Pantanal, which has several medicinal activities and fruits with a unique flavor rich in vitamin C. The species does not have defined cultivation methods, requiring studies to increase biomass production. An alternative is the use of organic residues that can influence the chemical, physical and biological characteristics of soils and consequently increase plant production. Thus, the objective was to evaluate the effect of different organic residues and bokashi, on the biomass production of plants and on the levels of phenols, flavonoids and antioxidant activity of tea from the leaves of guavira. Five substrates were studied in pots and protected environment: soil; soil + rice husk chicken manure; soil + sawdust chicken manure; soil + castor bean cake; soil + Organosuper® with or without the use of Bokashi in a 5x2 factorial scheme, in a randomized block experimental design. It was observed that the rice husk chicken manure can be used to increase the initial growth and biomass production of guavira keeping the leaves antioxidant activity tea stable. The use of bokashi benefits the growth of guavira only when no other organic residue is added to soil.

Abstract Because of the lack of agronomic information regarding cultivation of the pink pepper (Schinus terebinthifolius), this study aimed to verify the effect of gypsum and phosphorus on the initial growth and how they affect soil fertility. The treatments consisted of four levels of agricultural gypsum (0; 750; 1,500, and 2,250 mg kg-1) and P2O5 (0; 41.7; 83.4, and 125.1 mg kg-1), with a 4 × 4 factorial arrangement, in a completely randomized design with four replications. Morphological variables and nutritional content taken at 165 days after transplant were shown to be adequate to assess the initial growth and to show their nutritional requirements, indicating that plants are responsive to phosphorus. The association of higher gypsum and P2O5 levels promoted higher plant vigor and their application to the soil increased the availability of calcium, phosphorus, and base saturation.

Resumo O objetivo deste trabalho foi avaliar o efeito de doses de K no desenvolvimento inicial e eficiência nutricional de mudas da aroeirinha. Para isso foi desenvolvido em casa de vegetação um experimento em vasos com cinco doses de K2O (66,67, 133,33, 200, 266,67 e 333,33 mg kg-1), dispostos em delineamento experimental de blocos casualizados, com cinco repetições. Aos 180 dias após transplante todas as plantas foram colhidas e avaliadas quanto à altura, diâmetro, área foliar, massa seca de raiz e da parte aérea, conteúdo em raiz e parte aérea e eficiência de absorção, de uso e de translocação dos nutrientes. A adubação potássica incrementou o desenvolvimento da aroeirinha, as maiores alturas das plantas e o diâmetro do caule foram obtidos quando as plantas foram cultivadas com 210 mg kg-1 de K2O e as maiores massas secas da parte aérea, área foliar e conteúdo e eficiência de nutrientes quando as plantas foram cultivadas com a dose de 66,67 mg kg-1 de K2O.

Abstract The objective of this work was to evaluate the effect of K doses on the initial development and nutritional efficiency of Brazilian pepper tree. For this purpose it was developed under greenhouse conditions in pot experiment with five level of K2O (66.67, 133.33, 200, 266.67 and 333.33 mg kg-1) a randomized complete block design with five replicates. At 180 days after transplant, all plants were harvested and evaluated for height, diameter, leaf area, root and shoot dry mass, root and shoot contents, and efficiency of uptake, use and translocation of nutrients. Potassium fertilization increased the development of Brazilian pepper tree, the highest plant height and stem diameter were obtained when the plants were grown with 210 mg kg-1 K2O and the highest dry shoot mass, leaf area and nutrient content cultivating with the dose of 66,67 mg kg-1 de K2O.

RESUMO Devido à carência de estudos agronômicos com espécies nativas e da importância do adequado fornecimento de nutrientes às plantas, objetivou-se neste trabalho avaliar o efeito de doses de N e P sobre o teor e conteúdo de nutrientes, bem como na eficiência nutricional de mudas de barbatimão (Stryphnodendron polyphyllum), em Latossolo Vermelho distroférrico. O trabalho foi desenvolvido em vasos de 8 dm3 , mantidos em casa de vegetação. Foram estudadas quatro doses de N (0; 20,82; 41,64 e 62,46 mg kg-1 de N) e quatro doses de P (0; 41,72; 83,44 e 125,16 mg kg-1 de P2O5), em esquema fatorial 4 x 4, no delineamento experimental de blocos casualizados, com quatro repetições. Decorridos 210 dias após a semeadura avaliou-se massa seca da parte aérea e radicular e teor de macro e micronutrientes na planta; por meio desses dados foram calculados os índices de eficiência de absorção e utilização de nutrientes. Houve interação significativa entre as doses de N e P para os teores de P, K, Ca, Cu, Mn e Zn na parte aérea e N, P, K, Ca, Mg e Fe na raiz. Na parte aérea das mudas, os nutrientes N e Fe foram influenciados somente pelo efeito isolado das doses de N, e o teor de Mg pelo efeito isolado das doses de P. O conteúdo de todos os nutrientes, na parte aérea e na raiz, foi influenciado significativamente pela interação entre as doses de N e P. As máximas doses proporcionaram maior conteúdo de macronutrientes na parte aérea, exceto N e K. O conteúdo de micronutrientes na parte aérea aumentou em função das doses de N e P e reduziu na raiz, exceto Fe. As mudas de barbatimão mostraram-se mais eficientes em absorver N e Zn e utilizar P e Mg. Comparados ao conteúdo, o N e o Ca foram os nutrientes mais acumulados nos tecidos da planta, contudo, os que apresentaram menor valor (P e Mg) foram os nutrientes mais eficientemente utilizados.

ABSTRACT Due to lack of agronomic studies with native species and the importance of an adequate supply of nutrients to plants, this study aimed to evaluate the effect of N and P on the concentration and nutrient content as well as the nutritional efficiency of barbatimão (Stryphnodendron polyphyllum) seedlings in Oxisol. The study was conducted in 8 dm3 pots and kept in a greenhouse. Were studied four doses of N (0, 20.82, 41.64 and 62.46 mg kg-1 N) and four doses of P (0, 41.72, 83.44 and 125.16 mg kg-1 P2O5) in 4x4 factorial in randomized complete block design with four replications. After 210 days after sowing was evaluated dry mass of shoots and roots and nutrient concentration in the plant, through these data were calculated the efficiency of absorption and utilization of nutrients. There was significant interaction between doses of N and P to the concentration of P, K, Ca, Cu, Mn and Zn in shoots and N, P, K, Ca, Mg and Fe in the root. In seedling nutrients N and Fe were influenced only by the isolated effect of N levels, and Mg content by isolated effect of P levels. The content of all nutrients in the shoot and root was significantly influenced by the interaction between doses of N and P. The maximum doses provided greater nutrient contents in shoots, except for N and K. The micronutrients content in the shoot increased as a function of both N and P and reduced the root, except Fe. The barbatimão seedlings were more efficient at absorbing N and Zn and using P and Mg. Comparing the content, N and Ca were the nutrients that most accumulated on the plant tissues, however, those who had lower (P and Mg) were the nutrients more efficiently used.