On-line version ISSN 1668-298X
LEGUIZAMON, E.S. and VERDELLI, D.V.. Yields of corn and soybean in crops systems in strips and monoculture: effects of the orientation of the seed. Agriscientia [online]. 2011, vol.28, n.2, pp. 147-156. ISSN 1668-298X.
The association of summer crops can be an alternative to intensification of production systems of the Pampas. In an experiment conducted in Monte Buey (Argentina), we evaluated the performance of systems in corn-soybean strips, compared with their respective monocultures; in the same experiment were also evaluated whether different planting guidelines impact the performance of both systems. The interception of photosynthetically active radiation (IPAR) in the strips of corn planted in an east-west direction was greater and led to higher grain yield. The stripes oriented north-south, northeast-southwest and northwest-southeast, had higher yields than the monoculture; however, the IPAR was not clearly higher. In the corn monoculture treatments the effect of seed orientation did not change neither the IPAR or the crop yield. Soybean cultivation in strips was less IPAR and lower performance than monoculture treatments, regardless of the orientation of planting. In all cases, the association of crops had values of efficiency in land use greater than 1. The aggressivity index in all cases was greater than 0, indicating that maize had more competitive ability than soybeans.
Keywords : Strip intercropping; Monoculture; Aggressivity index.