Claim · model-written summary
Residual soil nitrogen tended to increase with fertilizer and cover crop.
- Treatment
- N fertilizer and cover crope0
- Outcome
- Residual soil Ne0
- Direction
- increasee0
- Qualifier
- tended toe0
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Residual soil N tended to increase due to N fertilizer and cover crop”
e1“inbred maize (Zea mays L.) lines”
Title
Cover crop and nitrogen fertilizer influence on inbred maize performance and soil nitrogen
Ada Vilches-Ortega; David Sotomayor-Ramírez; Johanis Rivera-Zayas; et al. The Journal of Agriculture of the University of Puerto Rico 2022. doi:10.46429/jaupr.v106i1.21051
Other claims from this paper (11)
- Intervention effect Cowpea cover cropping did not affect maize yield.
- Intervention effect Fertilizer nitrogen affected seed yield in two of three years.
- Observation Optimum seed yield was 7,034 kg/ha at 135 kg N/ha fertilizer.
- Observation Optimum seed yield was 4,708 kg/ha at 90 kg N/ha fertilizer.
- Association Net aboveground nitrogen balance increased with successive fertilizer levels.
- Observation The fallow nitrogen balance reached +516 kg N/ha.
- Observation The cover crop nitrogen balance reached +621 kg N/ha.
- Observation Some excess nitrogen was found in the soil profile.
- Intervention effect The cover crop rotation gave a slightly greater positive nitrogen balance at higher fertilizer rates.
- Recommendation The authors recommend cowpea cover cropping for long-term nitrogen recycling.
- Recommendation The authors recommend 90 to 135 kg N/ha, adjusted using soil inorganic nitrogen knowledge.