Implications of selection in common bean in contrasting environments concerning nitrogen levels / ImplicaÃÃes da seleÃÃo no feijoeiro efetuada em ambientes contrastantes em nÃveis de nitrogÃnio

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This study was conducted aimed at identifying lines of common bean efficient in the use of nitrogen and estimate the correlated response, in grain yield, in environments with low nitrogen availability by selection under no stress of the nutrient. One hundred lines of common bean were evaluated with and without nitrogen application in four environments. In each environment two distinct experiments, in a 10 x 10 triple lattice design were set up, with plots having two lines 2 m long. The index of response to nitrogen application and genetic and phenotypic parameters were estimated using the average grain yield. In the average of the four environments, grain yield with N was 16% higher than with no N. This value means a 3.81 kg of grain per kg of applied N. The lines differ in the efficiency of nitrogen usage. Among the more efficient and responsive are: BP-16, CVII-55-14, Ouro Negro and MA-III-9.91. The estimates of genetic and phenotypic parameters at different nitrogen levels indicate that it is possible to succeed with selection in environments with and without nitrogen stress. The correlated response in environments with low nitrogen availability by selection under no stress of the nutrient presents lower magnitude than that observed by direct selection. It appears that selection of lines for environments with low nitrogen availability should preferably be held in this condition.

ASSUNTO(S)

melhoramento vegetal

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