29Jatropha curcas L. is an interesting tropical oil crop for biodiesel production. 30 However, seed conservation until oil extraction may be a problem under high 31 temperature and humidity. In this study, Jatropha curcas L. seeds grown in 32 Mozambique and presenting 160 mg/kg of gamma-tocopherol in their oil were 33 stored for 42 days, in dark, at 35ºC and 75 % or 92 % Relative Humidity (RH). 34Along storage, the oil was extracted and analysed in terms of fatty acid 35 composition, tocopherol content, acidity, initial and final oxidation products 36 (monitored by K232 and K270 values, respectively). 37Jatropha seeds presented an initial water content of 8.4 % and an oil content of 38 45.7 % (dry basis). The oil was rich in oleic (41.2 %) and linoleic (38.8 %) acids. 39Along 42 days of storage, the acidity increased from 0.8% to 7.4 % and 25.3 % 40 and K270 increased from 0.07 to 0.25 and 0.46 in oils from seeds stored at 75% 41 and 92% RH, respectively. Simultaneously, a decrease in gamma-tocopherol 42 content was observed, which was more pronounced at 92 % RH than at 75 % 43 RH (96 % decrease versus 57% decrease). Gamma-tocopherol showed to 44 protect the oil against oxidation principally during the second stage of oxidation. 45During the storage at 35ºC, the fatty acid composition of the oils from seeds 46 kept either at 75 % or 92 % of humidity, did not significantly vary throughout the 47 test. 48 49

This work describes the potential of chemometric analyses applied to 1 H high-resolution magic angle spinning nuclear magnetic resonance ( 1 H HR-MAS NMR) data for the chemotaxonomic investigation of Hancornia speciosa (Apocynaceae) varieties. This plant, popularly known as mangaba, has a complex morphological differentiation and thus chemical analyses can be used for their taxonomic classification. In comparison to traditional techniques, 1 H HR-MAS NMR allied with chemometrics provided a simple and low cost method for chemotaxonomy. Leaves of four varieties of H. speciosa from a common garden experiment was studied and demonstrated that H. speciosa var. speciosa differs from others due to its specific metabolic profile, and var. pubescens was discriminated based on its high phenolic compound content. The distinction between the latter variety and gardineri is important once it allows for the selection of samples with greater commercial value, once they produce the largest and heaviest fruits.

A distribuição da vegetação no bioma Cerrado relaciona-se principalmente à profundidade do solo, uma vez que esta estabelece o estoque de nutrientes e de água no solo até o final da estação seca. O trabalho aborda a evolução das plantas nativas deste bioma, trazendo as principais adaptações anatômicas, fenológicas e fisiológicas relacionadas com a disponibilidade hídrica no solo. Redução na taxa de transpiração, investimento em sistemas radiculares espessados e profundos, dormência fisiológica de sementes e acúmulo de carboidratos não-estruturais em tecidos são as principais características adaptativas destas plantas às condições do Cerrado. Algumas espécies possuem eficiente mecanismo de ajustamento osmótico, sendo capazes de redistribuir água nos tecidos mesmo em condição de déficit hídrico, o que as permite, em taxas lentas, crescerem e se desenvolverem.

A cultura da soja é uma das principais culturas do agronegócio brasileiro, podendo ser limitada por adubações equivocadas em área de cerrado. Com o presente trabalho, objetivou avaliar a dinâmica da adubação fosfatada, pelo uso de fontes e doses na adubação de manutenção da cultura da soja, em solo com alto teor de P, verificando a real eficácia do uso do superfosfato triplo de eficiência aumentada. O experimento foi realizado em delineamento em blocos ao acaso, com quatro repetições, em esquema fatorial de 2x5, sendo o primeiro fator fontes de fertilizantes (superfosfato triplo e superfosfato triplo de eficiência aumentada) e segundo fator doses de P2O5 (0, 40, 80, 120 e 240 kg ha-1). O experimento foi conduzido em área experimental, em Rio Verde, GO, buscando-se avaliar as influências nas características de componentes de produção e produtividade da soja, bem como, na dinâmica do P no solo. Constatou-se que a cultura da soja não respondeu à adubação fosfatada, em solo com alto teor de P. O uso do Superfosfato triplo de eficiência aumentada não modifica a produtividade de grãos, mas, aumentou a exportação de P via grãos da cultura, em comparação ao Superfosfato Triplo convencional. Para a adubação fosfatada, recomenda-se o uso do Superfosfato triplo convencional na dose de 75 kg ha-1 de P2O5.

This study aimed to evaluate the density of spores and mycorrhizal colonization in roots of sugarcane varieties (RB86-7515, CTC-4 and CTC-15), under planting systems, being the planting of stem portions and pre-sprouted seedlings (PSS) along with 3 sources of nitrogen: granular fertilizer, leaf application and inoculation with diazotrophic bacteria (Azospirillum brasilense). The experiment was deployed on the experimental campus of the Evangelical School of Goianésia, and was collected soil samples for spore count after the first cut. The experimental design was arranged in factorial 3x2x3 in randomized blocks with subdivided plots using 4 repetitions per treatment, where factor 1 was represented by varieties, factor 2 by planting systems and factor 3 by nitrogen sources. The planting of PSS associated with foliar fertilization and A. brasiliense presented better colonization that in PSS with granular fertilizer and stem portions with leaf fertilizer and via inoculant. The granular fertilizer showed increased amounts of spores over the foliar fertilization and inoculation of Azospirillum brasilense, the planting system of stem portions presented greater quantity of spores over the planting of PSS, it is worth mentioning that approximate results of spore density, mycorrhizal colonization and productivity without adding granular fertilizer are satisfactory for reducing the use of fertilizers.