Desempenho agronômico e qualidade de sementes de cultivares de feijão-caupi na região do cerrado 1 Agronomic performance and quality of seeds of cowpea cultivar in the brazilian "cerrado" region Abstract -The productivities of cowpea are low, depending on the use of low productivity capacity cultivar planted, associated with the use of low-quality seeds. The objective of this work was to evaluate the agronomic characteristics and physiological quality in seed lots of different cultivar of cowpea in the "Cerrado", Goiás State, Brazil. The experimental design was a complete block with four replicates. The treatments were eight cultivar of cowpea (BRS Guariba, BRS 17 Gurguéia, BRS Rouxinol, BRS Marataoã, Patativa, BRS Tracuateua, BRS Milênio e CE 315), recommended for the North and Northeast regions of Brazil. The effects of the treatments were considerable for all the characteristics assessed. The cultivar BRS Guariba, BRS 17 Gurguéia and BRS Marataoã, presented less intense powdery mildew symptoms. The cultivar presenting higher yield were BRS Guariba and BRS Gurguéia, with 2,211 and 2,196 kg ha -1 of grain, respectively. The results showed that physiological seed quality influenced productivity of the cultivar. The cultivar BRS CE 315, BRS Gurguéia, BRS Rouxinol, BRS Marataoã and Patativa, with colored hull, produced seeds of better physiological quality compared, to the cultivar of white hull BRS Tracuateua, BRS Milênio and BRS Guariba.

Objetivou-se com este trabalho avaliar a capacidade competitiva de genótipos de feijão de diferentes tipos de crescimento sob presença e ausência de comunidade infestante de plantas daninhas, em duas safras de cultivo ("águas'' de 2006/07 e "seca'' de 2007). Foi utilizado o delineamento de blocos casualizados, em esquema fatorial 3 x 2, com quatro repetições. Os tratamentos foram constituídos de três cultivares de feijão com diferentes tipos de crescimento (Pérola: tipo III/II; Aporé: tipo III; e BRS Radiante: tipo I), em combinação com dois tipos de manejo de plantas daninhas: área capinada manualmente e área não capinada. Conclui-se que no cerrado brasileiro, na safra das "águas'', os problemas da cultura do feijão com as plantas daninhas foram agravados, especialmente com Brachiaria ssp., Cenchrus echinatus, Digitaria horizontalis e Eleusine indica. Os cultivares de feijão com hábitos de crescimento semiereto (Pérola) e prostrado (Aporé) foram mais competitivos com a comunidade infestante de plantas daninhas.

NUTRIENT CONTENTS AND PHYSIOLOGICAL QUALITY OF COMMON BEAN SEEDS IN RESPONSE TO LEAF FERTILIZATION WITH MANGANESE AND ZINCThe objective of this work was to evaluate the contents of nutrients and the physiological quality of seeds from common bean that had leaf application of manganese and zinc. The experiment was carried out at Dystrophic Red-Yellow Latosol 'cerrado' phase, in Ijaci, Minas Gerais State, Brazil. A randomized block design with four replicates was analyzed in a factorial arrangement, being the treatments formed by the combination of five rates of Mn (0, 75, 150, 300 and 600 g ha -1 ) and five rates of Zn (0, 50, 100, 200 and 400 g ha -1 ), split in leaf sprayings at 25 and 35 days after emergency. It was evaluated the content of nutrients present in the seeds and its physiological quality, through the standart germination test and vigor test by means of first counting, accelerated aging and electric conductivity. The leaf application of manganese and zinc promoted linear increments in the contents of Mn and Zn in the seeds of bean. The seed contents of N, P, B and Cu were influenced by the application of manganese and zinc. The physiologic quality of seeds was influenced by manganese fertilization, when estimated by the test of electrical conductivity. Zinc did not affect the physiologic quality of bean seeds.

R ESU M OO estudo da cinética de secagem é de fundamental importância para a modelagem matemática, a qual tem sido muito usada no projeto e em análise dos processos de transferência de calor e de massa, durante a secagem. Buscou-se, então, avaliar a capacidade de ajuste de nove modelos matemáticos comumente utilizados para descrever o processo de secagem em sementes de crambe (Crambe abyssinica Horts), através de um delineamento inteiramente casualizado com três repetições, em que os tratamentos são constituídos de cinco teores de água (0,11; 0,13; 0,17; 0,25 e 0,28 decimal b.s) e cinco temperaturas do ar de secagem (30; 40; 50; 60 e 70 ºC). Para verificação do ajuste dos modelos estudados fez-se análise de regressão não-linear, pelo método Quasi-Newton. De acordo com os dados obtidos concluise que: o modelo da Aproximação por Difusão é o que melhor se ajusta aos dados de secagem obtidos; o aumento da temperatura de secagem promove maior taxa de remoção da água do produto; o coeficiente de difusão apresenta valores da ordem de 0,18 × 10 -10 e 3,92 × 10 -10 m 2 s -1 e a energia de ativação para a difusão líquida foi da ordem de 4,97 kJ mol Drying kinetics of crambe seedsA B ST R A C T Drying kinetics is fundamental for mathematical and modeling widely used in the project and in the analysis of heat and mass transfer during drying. In this study it was sought to assess the capability of adjustment of nine mathematical models commonly used to describe the seed drying process of Crambe abyssinica Horts. The experimental design was completely randomized, with three replications. The treatments were five water contents (0.11; 0.13; 0.17; 0.25 and 0.28 decimal dry weight) and five drying temperatures (30; 40; 50; 60 and 70 ºC). To determine the adjustment of the studied models a non linear regression analyses was performed according to Quasi-Newton method. According to the data obtained it was concluded that: the diffusion approximation method was the model that best adjusted to the drying data obtained; increases in drying temperature promoted higher rate of moisture removal from the seeds; the diffusion coefficient showed values of 0.19 × 10 -10 and 3.9 × 10 -10 m 2 s -1; the activation energy for liquid diffusion during drying of Crambe abyssinica Horts was about 4.97 kJ mol -1 .

Resumo -O uso de novos cultivares de milho na safrinha tem proporcionado aumentos expressivos no rendimento de grãos, o que tem aumentado a lucratividade com a cultura no Centro-Oeste. Porém, devido ao grande número de híbridos disponíveis no mercado, há a necessidade de avaliação para escolher aqueles que proporcionem maiores rendimentos de grãos e retornos financeiros ao produtor rural. Portanto objetivou-se neste trabalho avaliar os desempenhos agronômico e econômico de híbridos de milho no período da safrinha na região Centro-Oeste. O delineamento experimental utilizado foi o de blocos casualizados com quatro repetições. Os tratamentos consistiram de trinta e seis híbridos de milho, sendo quatro pré-comerciais. O híbrido P30S31 foi utilizado como testemunha. Para avaliar a performance dos materiais, efetuaram-se avaliações de características agronômicas e econômicas. Os resultados obtidos permitiram constatar maior rendimento de grãos e rentabilidade econômica com o cultivo dos híbridos AS1575, DKB390, P30S31 e P4042. Dentre os híbridos pré-comerciais, o RB9210 apresentou maior rendimento de grãos na safrinha. A maior rentabilidade econômica do milho safrinha foi obtida por meio do maior rendimento de grãos. Também foi constatada correlação positiva do peso de mil grãos, população e altura de plantas com o rendimento de grãos, sendo o oposto verificado para severidade de doenças foliares. Abstract -The use of new maize cultivars in off-season cultivation has provided significant increases in grain yield, which has increased the profitability of the crop in the Central Brazil region. However, due to the large number of hybrids available commercially, there is a need to choose those of higher grain yields and economic returns to farmers. Therefore, the objective of this experiment was to evaluate the economic and agronomic performance of maize hybrids in off-season cultivation in the Central Brazil region. The randomized block design was used with four replications. The treatments consisted of thirty-six maize hybrids, being four pre-commercial hybrids with four repetitions. The hybrid P30S31 was used as control. To evaluate the performance of the hybrids, we assessed their economic and agronomic characteristics. The results showed higher grain yield and net operating profitability with the growing of the hybrids AS1575, DKB390, P30S31 and P4042. The pre-commercial hybrid RB9210 showed higher grain yield potential in off-season cultivation. The higher profitability of the off-season maize crop was obtained by higher grain yield. Positive correlations were observed for grain weight, population, and plant height, with grain yield. A negative correlation was observed between leaf disease severity and grain yield.