EFFECT OF SPRAYING GIBBERELLIN AND THIAMINE ON THE GROWTH AND YIELD OF CORN (ZEA MAYS L.).

The field experiment was conducted on one of the private farms located in Al- Musauib project area, 40 km north of Babylon Governorate, during the spring and autumn seasons of 2022. To know the effect ofspraying gibberellin and thiamine and spraying stages on the growth and yield of corn. The experiment wasimplemented according to the split plots arrangement, and the treatments were distributed using the Randomized complete block design (R.C.B.D) with three replicates. The data were analyzed statistically according to the analysis of variance method, and the arithmetic means were compared using the least significant difference test (L.S.D) at a probability level of 0.05. Where the main plot included three stages of addition and they were (the stage of formation of 4 leaves, the stage of formation of 8 leaves, the stage of flowering) and symbolized by the symbols (A1, A2, A3). The subplot included spray concentrations and were as follows: spraying with distilled water only, gibberellin at a concentration of 100 mg.L^-1 and thiamine (vitamin B1) at a concentration of 100 mg.L^-1 and the interaction between gibberellin at a concentration of 100 mg.L^-1 and thiamine 100 mg.L^-1, and symbolized by (B0, B1, B2, B3) and the results were asfollows :The stage of formation of 8 leaves (A2) excelled significantly and gave the highest average for most of the studied traits and for both season, respectively. Total plant yield (181.07 and 175.01) kg.ha^-1, biological yield (548.81 and 529.83). 3 treatments were significantly excelled on the rest of the other treatments and gave the highest mean of the two roots, respectively, for the traits of plant height (141.97 and 146.26) cm, leaf area (6778.96 and 6718.31) cm², stem diameter (2.55 and 2.41) cm, total plant yield (201.56 and 195.49) kg.ha^-1, biological yield (625.71 and 605.90). The results also showed that the interaction between the study factors had a significant effect. The interaction treatments (A2 + B3) excelled and gave the highest values for most growth, yield and qualitative traits. [ABSTRACT FROM AUTHOR]