Two field experiments were conducted at Agricultural Research Farm of the Faculty of Agriculture, Benha University during the two summer seasons of 2018 and 2019, to investigate the growth, yield and its components and related weed of soybean Giza 111 variety under different planting dates (May 5, May 20 and June 3) and weed control treatments (Omega herbicide, Goal herbicide, hand hoeing twice and control). The outcome of this study demonstrated that early planting date (May 5) notably improved plant height and number of pods (at 70 and 90 days after planting), as well as enhanced absolute growth rate (AGR) and net assimilation rate (NAR) relative to other treatments (p < 0.05). Furthermore, the application of GA3 (100 ppm) recorded the maximal values of all growth parameters, except RGR and chlorophyll content were realized at 0 and 50 ppm correspondingly. At 90 DAP, the tallest plants (120.54 cm), and highest No. of leaves/plant (34.11), No. of pods/plant (55.09), and dry weight of stem (21.67 g), pods (23.55 g) and plant (68.75 g) were observed following the combined effect of early sowing (May 5) and GA3 at 100 ppm, whereas the interaction between early planting date and GA3 at 50 ppm resulted the maximum values of AGR (1.074 g/day), RGR (0.019 g/day) and NAR (1.074 g/day). Spray of Omega herbicide and plants treated with GA3 at 100 ppm gave the highest dry weight of leaves, stem, pods and whole plants at 70 DAP and the lowest values were obtained from no weeding and untreated plants of GA3. The early sowing date (May 5) and hand hoeing twice recorded the maximum No. and dry weight of pods vis-a-vis other planting dates and all the other weed control methods. Results of the combined analyses of the two seasons also showed that weight of pods and No. and seed weights/plant (g), seed yield (kg/fed) were significantly increased (p |
