Abstract
Background: Intercropping and row arrangement represent a dynamic frontier of research and practical application, influencing resource allocation, weed competition and overall crop productivity in a modern agro ecosystem. This study aimed to investigate the impact of row orientation and arrangement on weed competition and crop performance within the Sudan savannah ecology of Nigeria during the 2018 rainy season. Methods: A field experiment was conducted at BUK (Latitude 11°58'N and Longitude 8°25'E) and Minjibir (Latitude 12.14590N and Longitude 0.866'4850E), utilizing two orientations (East-West and North-South) and seven sorghum: groundnut row arrangements (1:1, 1:2, 2:1, 2:2, 3:3, 2:4 and 4:2). A randomized complete block design with three replications was used, with simultaneous cultivation of SAMSORG 40 sorghum and SAMNUT 24 groundnut varieties. Result: The 2:1 row arrangement exhibited the lowest weed density (23.2 and 31.1 m-2) and dry weight (408.6 and 438.2 kg ha-1). East-West orientation reduced weed density by 24.5% at BUK and 20.8% at Minjibir. North-South row orientation significantly increased sorghum grain yield by 17.7% and reduced groundnut kernel yield by 9.37%. Higher sorghum yield (699.6 and 773. 7 Kg ha-1) was observed with 2:1 whereas the 1:2 arrangement yielded more groundnut kernels (329.2 and 338.1 kg ha-1). East-West orientation and the 2:1 row arrangement suppressed weed growth and recorded higher yields.
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