Two field experiments were carried out during the two successive summer seasons of 2014 and 2015 in a private sector
farm at Kafr Elsohbi Village, Shibin Alqanter, Qalubia Governorate, Egypt to improve the growth, productivity and quality of
common bean (Phaseolus vulgaris L.) cv. Nebrasica using some growth regulators i.e., naphthalene acetic acid (NAA) at 40 ppm,
gibberellic acid (GA3) at 100 ppm, benzyladenine (BA) at 40 ppm supplemented with boron spray at 100 ppm grown at different
sowing dates (mid February, mid March and mid April). In general the tallest plants were scored by the combinations of mid
March planting date, with those received NAA+B. In addition, the highest number of branches and leaves as well as the heaviest
fresh and dry weights of plant were registered by the combination of mid March sowing date, with those received BA+B
treatment in the two seasons. Moreover, the highest dry seed yield/plant, seed yield/fed and weight of 100 seeds were scored by
the combination of BA+B-sprayed plants with sowning on mid March in the two seasons. Furthermore, leaf and seed chemical
composition i.e., total nitrogen, phosphorus, potassium and total carbohydrates as well as total protein were greatly responded for
the studied sowing dates. However, mid March sowing date gave rise to the highest values of N, P, total carbohydrates and total
protein contents, followed by mid February sowing date, especially those sprayed with BA+B treatment in the two
seasons.Conclusively, in order to produce higher dry seed yield with good quality of common bean, it is preferable to sow the
seeds on mid March and spray the plants with benzyladenine at 40 ppm enriched with boron at 100 ppm three time during the
growing season. Additionally, the plants that sown on mid February and April could give the previously mentioned prospective
traits when sprayed with benzyladenine and boron treatments. |
