O conhecimento do estado nutricional da planta e a exportação de nutrientes pela cultura auxiliam na tomada de decisão nos programas de adubação, podendo melhorar a qualidade e a produtividade de frutos de abóbora. O presente trabalho teve por objetivo avaliar o estado nutricional das plantas, a produtividade, a qualidade e a extração de nutrientes pelos frutos de duas cultivares de abóbora híbrida tipo Tetsukabuto adubada com biofertilizante suíno. O experimento foi realizado no período de março a agosto de 2008. O delineamento experimental foi em blocos casualizados, no esquema fatorial 2 x 5, compreendendo dois híbridos (Kobayashi e Jabras) e cinco doses de biofertilizante: 0, 5, 10, 20 e 40 m³ ha-1, com quatro repetições. A maior produtividade de frutos foi alcançada na dose de 35,34 m³ ha-1 de biofertilizante de suíno. A massa fresca e a cavidade interna dos frutos aumentaram com o aumento da dose do biofertilizante. O teor de sólidos solúveis totais na polpa dos frutos foi maior na testemunha, sem biofertilizante. A exceção do P e S, os teores foliares de nutrientes apresentaram-se dentro da faixa adequada para a cultura. A quantidade máxima de macronutrientes exportada pela massa seca de frutos de abóbora deu-se na ordem decrescente: K>N>P>Mg>Ca>S. O biofertilizante suíno pode ser utilizado como fonte de nutrientes no cultivo de abóbora híbrida, porém é recomendada a combinação com fontes de P para complementar a baixa disponibilidade deste nutriente.

Cagaita (Eugenia dysenterica DC.) is a native fruit tree with high economical potential from the Brazilian Cerrado. However, little is known about the essential nutritional demands of its seedlings. To determine the nutrient demands of Cagaita, a greenhouse experiment was performed, in which plants were grown under hydroponic condition to assess the growth (length and diameter of stems, number of leaves, number of nodes, volume and length of roots, area of the leaf and crown and total dry weight of the leaves, stems and roots) and nutrient concentration (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn) at different time points after the plant were transferred into a nutrient solution. The seedling growth presented linear behavior until 180 days after transplantation. The total plant dry weight was 6.54 g after 180 days of transfer into the nutrient solution. The N content was positively correlated with the total dry weight and leaf area, whereas B was negatively correlated with the length of the stem and number of leaves. Macro and micronutrient concentrations presented the following order: N>Ca>K>P>Mg>S, Fe>Mn>B>Zn>Cu. A principal component analysis of the different sampling times provided important information used to define the growth variables.

Knowledge about the growth and nutritional aspects of Anacardium othonianum Rizz. ('caju-de-árvore-do-cerrado'), which is a native fruit of the Brazilian Cerrado (savannah), is still incipient. The objectives of the present study were to characterize growth and nutrient accumulation of A. othonianum seedlings grown in a nutrient solution. The experiment was designed in randomized complete blocks with four replicates and six treatments, and the experimental period was 180 d after transplanting (DAT). Each treatment corresponded to an evaluation period that was performed every 30 d. During each sampling period, characteristics related to growth and nutrient accumulation in the plant were evaluated. Plant growth was continuous throughout the cycle with the following maximum values at 180 DAT: 16.76 cm for stem length, 8.09 mm for stem, 11.27 leaves per plant for the number of leaves, and 329.60 cm 2 for leaf area. The monthly rates of plant fresh matter and DM accumulation were 3.15 and 1.05 g, respectively. The accumulation of nutrients in A. othonianum seedlings had the following order: Ca > N > K > P > Mg > S for macronutrients and Fe > Mn > B > Zn > Cu for micronutrients.

Indexes to assess nitrogen status of potato multiplied by different propagation materialsImprovement in the efficiency of N application can be achieved by synchronizing the plant demand with N supply during the potato cycle. The objective of this study was to determine the optimum values of nitrogen indexes over the cycle of potato grown in a greenhouse, using different propagative materials such as seed tuber, minituber, and sprout tuber, common in the pre-basic seed tuber production. The indexes, determined in the fourth (FL) and the oldest (OL) leaf, were green color intensity, measured by chlorophyll meter and color chart, and agronomic characteristics as leafletRecebido para publicação em maio de 2010 e aprovado em abril de 2011

-BRSMG Majestoso was developed by UFLA/Embrapa Rice and Beans/UFV/EPAMIG and released for the state of Minas Gerais, Brazil, in view of its high average yield, superior grain quality, anthracnose resistance and low susceptibility to angular leaf spot.

Plant parameters associated with adequate nutritional nitrogen status of cabbageCorrect management of cabbage fertilization can be achieved by synchronizing the plant demand with N supply during the crop cycle. The objective of this study was to evaluate the evolution of nutritional parameters intensity of green color (SPAD index) taken on the fourth fully expanded leaf, N content, stem length, number of leaves, and fresh and dry matter weights to diagnose nitrogen status of cabbage and determine the critical value of each parameter at different assessment times. At 50, 64 and 78 days after sowing, the intensity of green color (SPAD index) measured on the fourth leaf, stem length, number of leaves, fresh and dry matter weights and N content in the leaf dry matter were determined. Five N rates (0, 75, 150, 300 and 450 kg ha -1 ) were evaluated. Treatments were arranged in a randomized block design with four replications. Last harvest of cabbage heads was at 103 days after sowing. Optimal values of variables over cabbage cycle depended on N rates and time of evaluation. Optimal SPAD values were 60.8, 58.4 and 53.5 at 50, 64 and 78 days after sowing respectively. Optimal values of N content were 62.9, 60.3 and 59.0 in the leaves, 48.6, 40.6 and 40.3 in the stem and 39.9, 36.9 and 20.1 in the roots.

RESUMO.O objetivo deste trabalho foi selecionar índices para diagnóstico do estado de nitrogênio de batata-semente básica em vaso e determinar valor crítico de cada índice selecionado. Os índices, medidos na quarta folha (QF) e folha velha, aos 60 dias após o plantio, foram: intensidade do verde (determinado por tabela de cor e SPAD); área, comprimento, largura, número de folíolos, matéria fresca e seca; teor N-NO 3 na seiva do pecíolo e N na matéria seca. Foram realizados três experimentos em vaso, em casa de vegetação, Universidade Federal de Viçosa. Em cada experimento utilizou-se um material de propagação que foi tubérculo-semente, mini-tubérculo e broto e foram avaliadas seis doses de N (0; 25; 50; 100; 200 e 400 mg dm -3 ), sendo 10% de cada dose aplicada em pré-plantio e o restante via água de irrigação, diariamente por 30 dias. Cada experimento foi instalado no delineamento de blocos ao acaso, com quatro repetições. A colheita dos tubérculos ocorreu quando a planta estava totalmente seca. O índice SPAD, teor nitrato na seiva e massa seca na QF correlacionaram significativamente com conteúdo de N na planta sendo o valor crítico variável com o material de propagação.Palavras-chave: Solanum tuberosum L., propagação, nível crítico.ABSTRACT. Selection of indexes for the diagnosis of nitrogen state of basic seed potato. The objective of this study was to select indexes for the diagnosis of nitrogen status of basic seed potato planted in pot and to determine the critical value of each index. The indexes, determined in the fourth leaf (QF) and old leaf, at 60 days after planting, were: green intensity (determined by color chart and SPAD), area, length, width, leaflet numbers, fresh and dry weight, N-NO 3 contents in the petiole sap and N in the dry matter. Three experiments were set in pot containing substrate in a greenhouse, at University Federal of Viçosa. In each experiment it was utilized one propagation material as tuber seed, minituber and sprout and were evaluated six nitrogen rates (0, 25, 50, 100, 200 and 400 mg dm -3 ), being 10% of each rate applied at pre-planting time and the remainder was daily applied via irrigation water for 30 days. Each experiment was set in randomized block design with four replications. The final tuber harvest occurred when the plant was completely senescent. SPAD index, N-NO 3 contents in the sap and dry matter in the QF significantly correlated with plant N contents and reached different critical values depending upon the propagating material.

-Hancornia speciosa Gomes (Mangaba tree) is a fruit tree belonging to the Apocynaceae family and is native to Brazil. The production of seedlings of this species is limited by a lack of technical and nutritional expertise. To address this deficiency, this study aimed to characterize the visual symptoms of micronutrient deficiency and to assess growth and leaf nutrient accumulation in H. speciosa seedlings supplied with nutrient solutions that lack individual micronutrients. H. speciosa plants were grown in nutrient solution in a greenhouse according to a randomized block design, with four replicates. The treatments consisted of a group receiving complete nutrient solution and groups treated with a nutrient solution lacking one of the following micronutrients: boron (B), copper (Cu), iron (Fe), manganese (Mn), zinc (Zn), and molybdenum (Mo). The visual symptoms of nutrient deficiency were generally easy to characterize. Dry matter production was affected by the omission of micronutrients, and the treatment lacking Fe most limited the stem length, stem diameter, root length, and number of leaves in H. speciosa seedlings as well as the dry weight of leaves, the total dry weight, and the relative growth in H. speciosa plants. The micronutrient contents of H. speciosa leaves from plants receiving the complete nutrient solution treatment were, in decreasing order, Fe>Mn>Cu>Zn>B. Index terms: Hancornia speciosa Gomes, mineral nutrition, symptoms, growth. CARACTERIZAÇÃO DE DEFICIÊNCIA NUTRICIONAL DE MUDAS DE MANGABEIRA (Hancornia speciosa Gomes) COM OMISSÃO DE MICRONUTRIENTES EM SOLUÇÃO NUTRITIVARESUMO -A mangabeira (Hancornia speciosa Gomes) é uma frutífera pertencente à família Apocynaceae, originária do Brasil. A produção de mudas desta espécie em grande escala ainda é limitada pela escassez de conhecimentos técnicos e nutricionais. Para obter maiores esclarecimentos sobre o assunto, este trabalho objetivou caracterizar os sintomas visuais de deficiência de micronutrientes, avaliar o crescimento e o acúmulo de nutrientes foliar de mudas de mangabeira, submetidas a diferentes soluções nutritivas com suspensão de micronutrientes. Plantas de mangabeira foram cultivadas em solução nutritiva, dentro de casa de vegetação, no delineamento de blocos casualizados, com quatro repetições. Os tratamentos foram constituídos de solução nutritiva completa e omissão individual de boro, cobre, ferro, manganês, zinco e molibdênio. Os sintomas visuais de deficiências de nutrientes mostraram-se, de maneira geral, facilmente caracterizáveis. A produção de matéria seca foi afetada pela omissão de micronutrientes, e o tratamento que mais limitou o comprimento do caule, diâmetro do caule, comprimento da raiz, número de folhas de mudas de mangaba e massa seca das folhas, massa seca total e o crescimento relativo da mangabeira, foi a omissão de ferro. Os conteúdos de micronutrientes das plantas do tratamento completo obedeceram à seguinte ordem decrescente de micronutrientes Fe>Mn>Cu>Zn>B em folhas de mangabeira. Termos para indexaçã...