Valdere Martins dos Santos

CAPACIDADE COMBINATÓRIA DE MILHO VISANDO À PRODUÇÃO DE SILAGEM

Although corn silage be sufficiently known, the availability of these materials in the market is low, demonstrating that specific breeding programs in this area are scarce. Thus, the aim of this study was to determine the predominant type of gene action in controlling the characteristics and estimate general (GCA) and specific combining (CEC) among commercial corn hybrids aimed at producing corn. The eight hybrids and 56 hybrid combinations were evaluated in crop year 2011/2012, in the town of Gurupi, located in southern Tocantins. The experimental design used was 8 x 8 lattice with two replications and analyzed three characteristics of commercial interest for the production of corn for silage. The hybrid combinations responded differently to combinations of capabilities, when subjected to conditions of low and high phosphorus availability, as evidenced by the significant effects of the interactions. This indicates that the selection should be performed in environments where they will be used. We conclude therefore that the hybrid P 30F53Y had higher concentration of favorable alleles in enhancing the features and PMS PMV being more suitable in the formation of new hybrids, combinations AG in 2040 x TRUCK, TRUCK AG 8060 and AG 1051 x x IMPACT was higher heterotic effect, these being the most suitable hybrids for silage. The dominant gene in this analysis is due to additive effects.

Weed interference on radish crop

This study aimed to evaluate the effect of different periods of weed coexistence with radish culture. The experiment was carried out in Gurupi-TO, in a randomized block design with four replications. The treatments consisted of 6 increasing periods of coexistence with weeds, considered from the rough, valued at five seasons assessments (5, 10, 15, 21, and 30 DAE). Dry stem masses were evaluated, leaf and total shoot, leaf area, root diameter and fresh root biomass. The data were submitted to analysis of variance to compare means by the Scott and Knott test. It was observed that longer periods of coexistence with weeds caused a reduction of 72.1% in the production of fresh weight root culture. Living with weeds up to 15 days after emergence did not significantly alter the radish root diameter in this study.