EFFECT OF DIFFERENT PLANT EXTRACT ON YIELD AND SEED QUALITY OF COUNTRY BEAN

Abstract

The experiment was conducted at the farm of Sher-eBangla Agricultural University, Dhaka during the period from November 2019 to April 2020 to study the effect of different plant extract on yield and seed quality of country bean. The experiment consisted of 7 treatments such as T 1 (Neem seed extract), T 2 (Neem oil), T 3 (Mehogoni seed extract), T 4 (Black pepper extract), T 5 (Garlic extract), T 6 (Tobacco extract) and Untreated control. The experiment was laid out in Randomized Complete Block Design with three replications. Results revealed that at early, mid and late pod development stage, the minimum incidence of number of bean pod borer larva plant (5.97, 7.89 and 8.54, respectively) and number of aphid plant -1 (2.49, 2.23 and 4.27, respectively) was recorded in the T 2 (Neem oil) treated whereas untreated control treatment showed highest incidence of bean pod borer larva and aphid plant -1 . Considering pods plant at early, mid and late pod development stage, the highest number of healthy pods plant (88.11, 138.90 and 72.77, respectively) and highest pod weight plant -1 (483.33, 658.33 and 247.33 g, respectively) were harvested from T 2 (Neem oil) treatment. In terms of % reduction of infestation over control by number and weight, T 2 (Neem oil) treatise with the showed best performance and this treatment also showed the highest number of inflorescence plant -1 (30.86), number of flower inflorescence (10.57), pod length (11.19 cm), number of pods plant (1470.67 g), pod yield (14.71 t ha -1 -1 -1 -1 -1 (16.01), number of pods inflorescence ), seed yield plant -1 (326.03 g), weight of pods plant -1 (179.90 g) and seed yield ha

(1799.00 kg) followed by T 5 (Garlic extract) treated plot whereas untreated control showed poorest results. The treatment T 2 (Neem oil) also produced the best quality seeds and showed highest seed germination (92.67%), shoot length (8.01 cm), root length (4.17 cm) and seed vigor index (1129.00) of 12 days aged seedlings followed by T 5 (Garlic extract) treated plot whereas untreated control treatment gave the poorest result. So, it may be concluded that the treatment T 2 (Neem oil) can be considered as best against aphid and bean pod borer infesting country bean and production of quality seeds.