EFFECT OF NITROGEN AND PHOSPHORUS ON GROWTH AND YIELD OF FRENCH BEAN (Phaseolus vulgaris L.)

Abstract

An experiment was carried out at the Soil Science research field of Sher-e-Bangla Agricultural University, Dhaka during the period from December 2019 to April 2020 to find out the effect of N and P on growth and yield of French bean. The experiment was laid out in two factorial RCBD with 3 (three) replications. Factor A (Four nitrogen doses) viz. N 0 = No Nitrogen applied. i.e. control; N 1 = 100 % Recommended Doses of Fertilizer (RDF) of Nitrogen; N 2 = 75 % Recommended Doses of Fertilizer (RDF) of Nitrogen and N 3 = 50 % Recommended Doses of Fertilizer (RDF) of Nitrogen and Factor B (Three phosphorus doses) viz. P 0 = No Phosphorus applied. i.e. control; P 1 = 100 % Recommended Doses of Fertilizer (RDF) of Phosphorus and P 2 = 50 % Recommended Doses of Fertilizer (RDF) of Phosphorus. Significant variation was found in all parameter due to the combined effect of different amount N and P fertilizer application. In case of nitrogen effects, the maximum plant height (38.94 cm), number of leaves/plant (23.52) at 60 DAS were obtained in N 1 treatment. As well as maximum yield (7.10 t ha -1 ) was also obtained in N 1 treatment, which was not statistically similar to N 2 treatment giving yields of 6.32 t ha II -1 . The lowest plant height (28.32 cm) and number of leaves/plant (15.81) were observed from the control nitrogen treatment (N 0 ). And also lowest yield 4.57 t ha -1 was recorded from plot where no nitrogen was applied (control). On the other hand, the highest plant height (37.44 cm), number of leaves/plant (21.62) at 60 DAT and yield (6.99 t ha -1 ) were recorded from 100 % RDF of phosphorus (P 3 ). Meanwhile, the lowest plant height (28.12 cm) and number of leaves/plant (15.77) at 60 DAS and yield (4.27 t ha -1 ) was observed in those plots where no phosphorus was applied (P 0 ). And finally, the combined effect of nitrogen and phosphorus on French bean showed the highest plant height (44.25 cm) and number of leaves/plant (27.64) at 60 DAS as well as grain yield (7.61 t ha -1 ) was produced when the crop was fertilized with N 1 P 1 treatment and was statistically similar to N 1 P 2 (7.47 t ha -1 ) treatment. The lowest plant height (25.99 cm) and number of leaves/plant (14.32) at 60 DAS and also grain yield (2.42 t ha treatment of N 0 P 0 -1 ) was recorded in the combine (control) . The findings of the present investigation clearly indicated that the appropriate use of N and P fertilizers and growing French bean is a viable option for improved cultivation.