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Abstract 119 - SUMMARY Four experiments were carried out at the Agricultural Research and Experiment Station, Faculty of Agriculture at Moshtohor, Kalubia Governorate, during 1979 and 1’980 seasons to investigate the effect of some herbicides as a single or in combinations under different cultural methods of planting. In addition to study the influence of the competition of weeds on the growth and soybean yield as well as the protein and ~il content, Calland cultiver was used, the soil in which the experiments were undertaken was silt cl,ay textured, wi th a pH value of 7.8 and 1.581 organic matter ecnrenr , Experiment I: This experiment included 30 treatments which were the using of 13 herbicides (slngle or combinations), beside the hoeing and control (un-weeded) treatments under ~NO methods of planting (heraty and sfir). These treat.ants iarranged in split plot da81gn with four replications. The two methods of planting arranged in the .a1n plots, whereas the weed control treatments 1n the subplots _ The 13 herbilcides treatment were: (Rate/faddan): afalon (11nuron) 1.0 kg.; amex (butralin) 2.0 L.; ronster (oxadiazon) 2.0 L; Sencor (metribuzin) 0.5 kg_; enide (dlphena_lde) 1.5 kg.; tridex (trifluralin-bladex) 1.0 L.I dicotex (phen18opha_:) 1.0 L and mixtures of linuron with the other herbicides by using half rate of that of the individual herbicide.The herbicidal combinations were more effecti\’e in controlling weeds than any single herbicide and it showed good effects on most growth characters studied at the early, moderate and late stage of soybean plant. 4. Linuron, tridex, phenisophem and mixtures of linuron with butrelin or tridex or phenisopham were e~~rox1- .ataly similar to hoeing in controlling broed-Ieaved weeds, while the worest treatments in controlling broad-leaved weeds were butralin, oxadiazon arid diphenamide. |