STUDIES ON THE EFFECT OF COMBINED FOLIAR APPLICATION OF B/Zn AND GROWTH REGULATORS ON THE GROWTH AND YIELD OF SOYBEAN (GLYCINE MAX. L (MERRIL))

Abstract

This study was conducted to analyze the effect of B/Zn and growth regulators (IAA, BAP and GA3) on-growth and yield of soybean Glycine max L (Merril) var. NARC-4 by foliar application. Two concentrations (CI (50ppm) and C2-C10Dppm)) .ofB, Zn, .and eCI (10-3 M) and C2 (10-4 M) ofIAA, BAP and GA3 were tested at three growth stages; vegetative, flowering and pod fill stage. Analysis of variation revealed that combined foliar application of B/Zn and IAA, BAP and GA3 positively affected the growth and yield of soybean. TI6 (ZnCI + IAACI + BAPCI) and Tl9 (BC I + ZnCI + IAAC I) produced maximum number of branches at pod-set stage. Significant variations were observed for number of leaves per plant at vegetative and pod-set stage. T21 produced maximum number of branches at vegetative stage and pod-set stage, Tl8 (ZnCI + BAPCI + GA3CI) produced maximum number of leaves at pod-set stage. Middle leaflet length was maximum with foliar application of T 21 at vegetative stage and pod-set stage. Middle leaflet width was maximum in Ts (BCI + BAPCI) at vegetative stage and in T3 (ZnCI + IAAC,) at pod-set stage. Maximum petiole length was recorded in T'9 (BCI + ZnC, + IAAC,) at vegetative stage and in T2, at pod-set stage. "Combined foliar spray of"B1Zn and growth regulators increa')ed shoot lengtb ..as compared to .control. T 2' .produced maximum shoot length at vegetative stage, pod-set stage and harvest stage stage. T 7 (ZnC, + BAPC,) produced maximum shoot fresh weight at vegetative stage, T2 (BC2 + IAAC2) at pod-set stage, T 12 (ZnC2 + GA3C2) at harvest stage stage. Root maximum fresh weight was obtained in T 21 at vegetative stage, T 2 at pod-set stage, and T 19 at harvest stage stage. Root maximum length was recorded in T 7 at vegetative stage, T 10 (BC2 + GA3C2) at pod-set stage and in T'7 (ZnCI + IAACI + GA3C,) at harvest stage stage. Maximum dry weight was recorded in T7 at vegetative stage, in T2, at pod-set stage and in T 20 at harvest stage stage. Root maximum dry weight was recorded in T 2' at vegetative stage, in T'6 at pod-set stage and T21 at harvest stage stage. Maximum number of pods was set at pod-set stage in T'8 and T'9. Maximum number of pods per plant at harvest stage stage was recorded in T19. Maximum number of empty, 1-seeded, 2-seeded and 3- seeded pods were recorded in T2l , T20 (BCI + ZnCI + BAPCI), TI (BC] + IAAC1) and in TI8 respectively. MaximumlOOO-seeded weight was in T16