The objective of the present work was to evaluate the effect of sowing system by changing the number of plants per hectare, and the distance between rows, on the grain yield of 10 dry bean varieties of different growth habit and earliness. The varieties used were: Pinto Bravo, Pinto Centauro, Pinto Coloso, Pinto Saltillo, Pinto Centenario, Pinto Libertad, Flor de Mayo Bajío, Flor de Mayo Dolores, Flor de Mayo Eugenia and Azufrado 2. Sowing date was 30 July 2011 under three planting systems: a) 0.76 m furrow planted in single row, b) beds of 1.52 m at triple row and c) beds 1.52 m with six rows. The experimental unit consisted of 8, 6 and 12 rows of 30 m in length with a gap of 0.76, 0.40 and 0.20 m for the single sowing, triple and six rows respectively. The higher grain yields were obtained with the treatment in beds of 1.52 m with six rows for most of the varieties. This determines that the variety Pinto Saltillo was superior to other varieties and had the highest yields in beds of 1.52 with six rows and close spacing.

....