Evaluating the Impact of Long-Term Phosphorus Placement on Corn and Soybean Rotation under Minimum Tillage System

Authors

Gustavo A. Roa, Kansas State University
Dorivar A. Ruiz Diaz, Kansas State UniversityFollow

Keywords

Phosphorus, placement, long term, strip tillage, corn, soybean, rotation

Abstract

Phosphorus (P) management is typically done with a focus on the long term, given its impact on soil fertility. The main objective of this study was to evaluate the effect of long-term P placement on corn and soybean yields under a minimum tillage system in Kansas. Long-term research trials were established in Scandia (irrigated field) and Ottawa (rainfed) in 2006. Fertilizer treatments were applied annually to corn, including broadcast, deep-band, and starter/deep-band at 40 lb/a of P₂O₅, with a control having no phosphorus fertilizer. Corn and soybean responded significantly to P fertilizer at both locations (compared to the control). In the higher-yielding Scandia location, split starter/deep-band application showed a statistically significantly higher yield than broadcast or deep-band. Yield response at the Ottawa location was similar for all the P fertilizer placements.

Recommended Citation

Roa, Gustavo A. and Ruiz Diaz, Dorivar A. (2023) "Evaluating the Impact of Long-Term Phosphorus Placement on Corn and Soybean Rotation under Minimum Tillage System," Kansas Agricultural Experiment Station Research Reports: Vol. 9: Iss. 8. https://doi.org/10.4148/2378-5977.8545