Black bean yield components in planting dates differents during autumm-winter cycle in northern Veracruz, México

Abstract

Planting dates influences the conditions that modify environment around the cultivation and alters physiological processes (pollination, reproductive organ abscission, seed abortion) and morphological process (leaf zise, dry matter) whose final expression is grain yield. A trial was established in the Campo Experimental Ixtacuaco-INIFAP during autumm-winter cycle 2012-2013, in order to record the yield its components in the bean variety Black Comapa in different planting dates: 1^a (september 20), 2^a (september 27), 3^a (october 4), 4^a (october 11) and 5^a (october 18); was used an experimental design in randomized blocks with four replications, the experimental unit consisted of four rows of 5 m length, 0,60 m apart, with useful plot two central rows. Were recorded number of harvested plants, pods per plant, seeds per pod, 100 grains weight (g) and grain yield (kg ha^-1). The analysis of variance realized with the UANL Statistical Package, version 2,5 showed significant differences between planting dates; the comparison using Minimum Significant Differences Test (0,05) indicated that the dates september 27 and october 4 had higher grain yield (1920,5 and 1976,6 kg ha^-1), more plants harvested (172,500 and 157,500) and pods per plant (12,3 and 13,6) respectively, under conditions of total precipitation of 372,5 mm and average temperature of 23,9 ^OC and no disease.