GROWTH ATTRIBUTES OF SOYBEAN AS AFFECTED BY TILLAGE SYSTEM, PLANT POPULATION DENSITIES AND WEED CONTROL TREATMENTS.

To examine the effects of tillage system, plant densities, and weed control treatments as well as their interactions on weed characteristics and growth attributes of soybean (Glycine max, L., Merrill) cv. Giza111, two field experiments were conducted at the experimental farm of the Faculty of Agriculture, Minia University, during the two successive seasons of 2019 and 2020.
The obtained results proved that full-tillage enhanced all tested aspects of soybean growth (plant height, number of branches per plant, leaf area, and leaf area index) as well as reduced weeds characteristics relative to no-till in both seasons. Sowing plants at a rate of 140000 plants/fed. produced the highest values of branches number per plant, leaf area, and leaf area index, while the tallest plants and the lowest weeds dry weights were achieved at 210000 plants/fed in both seasons. In most cases, hand hoeing twice (35 and 50 DAS) produced the tallest plants with highest number of branches, while plants received Select super 500 ml/fed. (35 DAS) plus Basagran 750 ml/fed. (50 DAS) recorded the largest LA and LAI. It could be concluded that for the best soybean growth was to adapt full-tillage system, sowing plants at 140000 plant/fed. and treated the plants with hand hoeing twice