Abstract
AbstractThe combination of subsoil compaction and injudicious usage of nitrogenous fertilizers are key factors that may lower crop yields, especially in soils with a shallow hardpan. Therefore, the objective of this study was to determine the effects of tillage and N application on carinata productivity in rainfed conditions. A 3‐year field study was conducted at the North Florida Research and Education Center, Quincy, FL, USA. Treatments were four rates of N (0, 45, 90, and 135 kg N ha−1) and three tillage methods (disking, chiseling, and no‐tillage). Maximum cone index measurements for no‐tillage occurred at 15 cm but at 20 cm soil depth for both chisel and disk tillage. A hardpan at 15 cm restricted taproot growth but promoted lateral root growth. Subsoiling and N application improved carinata growth relative to no‐tillage. Seed yield response to N application rate depended on the tillage method. The agronomic maximum seed yield occurred at 134, 128, and 125 kg N ha−1 for chisel, disk, and no‐tilled systems. Nitrogen agronomic efficiency was greatest at 45 kg N ha−1 for the chisel method and 95 kg N ha−1 for disk and no‐tillage. Tillage has a greater potential to increase yields even at relatively low N levels. When tilled, carinata produces 8%–17% greater seed yield at 45 kg N ha−1 than no‐tilled carinata grown with 135 kg N ha−1. These results indicate that tilling the subsoil and applying 90–135 kg N ha−1 are required for carinata production in soils with a hardpan.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.