Desempenho de cultivares de soja [Glycine max (L.) Merrill] em cultivo de verão no sul de Minas Gerais Performance of soybean [Glycine max (L.) Merrill] cultivars in the summer cropping in the south of Minas Gerais

Em função do seu potencial produtivo, a soja [Glycine max (L.) Merrill]ocupa posição de destaque na economia brasileira. O Sul de Minas Gerais apresenta crescente interesse pela cultura, principalmente para ser utilizada em rotação com o milho. Objetivou -se, com o presente trabalho, avaliar cultivares de soja adaptadas à região. Adotou - se delineamento experimental de blocos casualizados, com 3 repetições, em esquema fatorial 2 x 24, compreendendo dois locais (Lavras - MG e Itutinga - MG), e 24 cultivares de soja. A semeadura foi realizada na primeira quinzena de novembro, anos agrícolas 2006/07 e 2007/08. Verificou-se em Lavras que as cultivares UFV 16 (3553 kg.ha-1) e Monsoy 6101 (3543 kg.ha-1) foram as mais produtivas. Em Itutinga, as cultivares que mais se destacaram foram Monsoy 8001, Conquista, Vencedora, DM Nobre, Emgopa 315, DM Vitória, Monsoy 6101, Preta, UFV 16, Emgopa 316, Santa Rosa, Aventis 7002 e CAC 1 com produtividades variando de 2958 a 3575 kg.ha-1. Todos os materiais avaliados apresentaram grau de acamamento, altura de planta e de primeiro legume favoráveis à colheita mecanizada.<br>Due to its productive potential, soybean [Glycine max (L.) Merrill] occupies position of prominence in the Brazilian economy. The South of the State of Minas Gerais shows a growing interest in this crop, mainly to be used in rotation with maize. The objective of this work was to evaluate cultivars of soybean adapted to this region. The experiment design was randomized blocks, with three replicates, in factorial scheme 2 x 24; 2 sites (Lavras - MG and Itutinga - MG), and 24 soybean cultivars. The sowing was done in the first half of November, agricultural years 2006/07 and 2007/08. It was found that in Lavras the cultivars UFV 16 (3553 kg.ha-1) and Monsoy 6101 (3543 kg.ha-1) promoted the highest yield. In Itutinga, the better yield cultivars were Monsoy 8001, Conquista, Vencedora, DM Nobre, Emgopa 315, DM Vitória, Monsoy 6101, Preta, UFV 16, Emgopa 316, Santa Rosa, Aventis 7002 and CAC 1, with yields ranging from 2958 to 3575 kg.ha-1. All materials showed the degree of lodging, plant height and the first pod to be favorable to mechanized harvesting

Student performance may not improve when universities are choosier

We use unique administrative data from a leading Italian university to estimate whether the use of admission tests and conditional progression schemes are effective strategies to select high-performing students. Previous work, which has been predominantly correlational, has focused on the effect of selectivity policies on widening university access for individuals from ethnic minorities and disadvantaged backgrounds. Our evaluation method applies a difference-indifference (DD) design, which, under the assumption that the trends of the outcome variables would be the same across all departments within the same university in the absence of treatment, identifies the causal impact of selectivity policies. The estimates indicate that selectivity schemes may not lead university students to achieve better outcomes, in terms of greater likelihoods of completing their degrees, obtaining top marks and finishing their studies within the required minimum period. The study concludes with a discussion of the main findings and their implications