FLOWER AND POD DROPPING, GROWTH AND BIOLOGICAL YIELD OF MUNGBEAN AS AFFECTED BY IAA AND PLANT DENSITY

Abstract

A field experiment was conducted at the Agronomy field, Sher-e-Bangla Agricultural University, Dhaka, during March to June, 2014 to study the response of BARI Mung 6 under different planting density and foliar application of IAA (Indole-3-Acetisc Acid). The experiment was consisted of three spacings viz. i) 20cm x 10 cm (S 1 ) ii) 30cm x 10 cm (S ) and iii) 40cm x10cm (S 3 2 ) and four levels of foliar spray with IAA application viz. i) Control (A 1 ) ii) Spraying IAA @ 50 ppm at 25 DAS (A ) iii) Spraying IAA @ 100 ppm at 25 DAS (A 3 2 ) and iv) Spraying IAA @ 150 ppm at 25 DAS (A ). The experiment was laid out in randomized complete block design (RCBD) (factorial) with three replications. The results showed that growth, flower and pod dropping and biological yield of BARI Mung 6 significantly responded to the different levels of IAA application, plant density and their interaction effects. Significant effect of plant density was found on growth and biological yield. The plant with 30 cm x 10 cm spacing gave the highest biological yield ha -1 (5.41 t), stover yield ha -1 (0.884 t). Flower and pod dropping plant was minimum (17.95) in S Foliar application of IAA also had significant effect on different growth, flower and pod dropping and biological yield. The highest stover yield ha -1 1. (0.91 t), biological yield ha -1 (5.33 t) and harvest index (40.33%) were observed from 100 ppm of IAA application. However, the lowest flower and pod dropping plant -1 (16.99) was observed in 150 ppm IAA application. The combination effect of 100 ppm IAA application and 30 cm row to row distance showed maximum biological yield ha -1 (5.38 t) and 100 ppm IAA with 20 cm row to row distance gave lowest flower and pod dropping plant

-1 (16.28) 4 -1