Spatial variability of seed depth placement of maize under no tillage in Alentejo, Portugal
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Among the various factors that contribute towards producing a successful maize crop, seed depth placement is a key determinant, especially in a no-tillage system. The main objective of this work was to evaluate the spatial variability of seed depth placement and crop establishment in a maize crop under no-tillage conditions, using precision farming technologies. The obtained results indicate that seed depth placement was significantly affected by soil moisture content, while a very high coefficient of variation of 39% was found for seed depth. Seeding depth had a significant impact on mean emergence time and percentage of emerged plants. Shallow average depth values and the high coefficient of variation suggest a need for improvement in controlling the seeder sowing depth.
Keywordsmaps maize no-tillage seeding depth sensing
The authors acknowledge the permission given by Pedro Vacas de Carvalho, owner of the farm where the trial was carried out and Area400 (http://area400.com/) for remote sensing services.
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