Effect of natural extracts alone or combined with a recommended herbicide on weed control, productivity and quality of cotton under different nitrogen levels

Document Type : Original Article

Authors

1 Cotton Physiology Department, Cotton Research Institute, ARC, Egypt

2 Weed Research Central Laboratory, Sakha Research Station, ARC, Giza, Egypt.

Abstract

ABSTRACT                                                                                                      
Cotton is one of the most important cash crops in Egypt and worldwide. Its productivity is significantly hindered by fertilization and the presence of weeds. The presence of weeds negatively affects the growth of cotton plants. Therefore, methods and techniques for controlling weeds have differed in an attempt to get rid of them and avoid their negative impact on cotton plants. Therefore, two field experiments were conducted at Sakha Research Station, Kafr El-Sheikh Governorate, Agricultural Research Center (ARC), Egypt during 2023 and 2024 seasons. This study aimed to evaluate the efficiency of different urea fertilization rates (60, 45, and 30 N units/feddan) and assess the effect of aqueous extracts from  Xanthium strumarium and Sorghum bicolor weeds as natural allelochemicals both with and without Stomp Extra—on weed control, cotton productivity, and fiber quality. The main findings illustrated that Stomp Extra at 1.7 l/fed., applied as a post-sowing in combination with either aqueous extracts of Sorghum bicolor or Xanthium strumarium each at 15% conc., applied at 15 days after planting (DAP) were the most effective treatments for controlling Physalis angulata, Cyperus rotundus, Portulaca oleraceaandEchinochloa colonum. These treatments also significantly enhanced cotton growth and yield (No. of fruiting branches, No. of open bolls, earliness, boll weight, seed index and seed yield). Following in effectiveness was the combination of both S. bicolorandX. strumariumextracts each at 15% conc. and applied at 15 DAP under urea  at 45 N units / fed. It was noticed that these treatments did not affect cotton quality and the obtained results under 45 and 60 N/fed.

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