EFFECT OF INDOLE-3-ACETIC ACID AND ROW SPACING ON NODULATION, SOIL NITROGEN AND YIELD OF MUNGBEAN

Abstract

An experiment was conducted at the Agronomy field, Sher-e-Bangla Agricultural University, Dhaka, during March to June, 2014 to study the effect of IAA and row spacing on growth, nodulation, soil nitrogen and yield of mungbean. The experiment was consisted of four levels of IAA applications viz. i) control (No IAA spray) ii) Foliar spray of Indole-3-acetic acid (IAA) @ 50 ppm at 25 DAS iii) Foliar spray of Indole-3-acetic acid (IAA) @ 100 ppm at 25 DAS and iv) Foliar spray of Indole-3acetic acid (IAA) @ 150 ppm at 25 DAS and three spacings viz.

i) 20cm x 10 cm, ii) 30cm x 10 cm and iii) 40cm x10cm. The experiment was laid out in randomized complete block design (RCBD) (factorial) with three replications.The results showed that nodulation, soil N, yield and yield attributes of mungbean were significantly influenced by the different levels of IAA application, spacing and their interactions. The highest nodules dry weight, SPAD value (52.47 %), soil N change and seed yield ha -1 (2.15 ton) was observed in 100 ppm of IAA application. Spacing also had significant effect on different growth and yield parameters. The plant with 30cm x 10 cm spacing gave the highest SPAD value (49.99 %) and seed yield ha (2.17 ton). The interaction of 100 ppm IAA application and 30 cm row to row distance showed maximum SPAD value (55.00 %), soil N change and grain yield ha -1 (2.21 ton) as well as other yield contributing characters.

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