BACKGROUND: Potato is an essential crop for global food security, and its cultivation requires a significant amount of readily available nitrogen (N) to ensure tuber quality. Therefore, managing N with enhanced-efficiency fertilizers becomes a potential strategy to meet the seasonal potato N demand. A 3 site-years (SYs) study was conducted to assess the marketable attributes and mineral composition of table-stock potato in response to N rates and fertilizers urea, ammonium sulfate and ammonium sulfate nitrate (ASN) with nitrification inhibitor dimethylpyrazole phosphate (DMPP). RESULTS: At 75% of recommended N rate (RNR), ammonium sulfate and ASN+DMPP ensured marketable tuber yields equivalent to that observed at 100% of RNR. Urea promoted greater tuber K and Mg concentrations than ammonium sulfate and ASN+DMPP. Although inconsistent across SYs, ASN+DMPP generally reduced starch and reducing sugars contents and increased pulp pH and protein content than other fertilizers. Increasing N rates from 50% up to 75% and 100% of RNR increased marketable tuber yields and protein content, whereas soluble solids increased from 50% to 100% of RNR. Conversely, increasing N rates from zero to 75% of RNR reduced tuber firmness, whereas N application reduced tuber P concentration, regardless of N rates. CONCLUSION: Although ASN+DMPP showed potential for increasing marketable tuber yield and protein content, potatoes receiving ammonium sulfate and ASN+DMPP lowered tuber K and Mg concentrations compared to those receiving urea. Overall, potato tuber quality improvements are N source-specific, demanding strategies under which these fertilizers can ensure/improve tuber nutritional composition along with size quality.
Bibliographical noteFunding Information:
We thank the Coordination for the Improvement of Higher Education Personnel (CAPES) for providing a scholarship to the first author and the National Council for Scientific and Technological Development (CNPq) for granting awards for excellence in research to the second and third authors. The authors gratefully acknowledge the coordination of Regina M. Evangelista on some of the tuber quality evaluations. We also thank the potato grower (Ioshida Group) who provided the area for the experiment in Avaré‐2012. Mention of commercial products and trade names in this publication is exclusively for providing particular information and does not signify recommendation or endorsement by the authors or their institutions.
© 2021 Society of Chemical Industry.
- Solanum tuberosum L.
- nitrification inhibitor
- nitrogen source
- nutritional value
- table-stock potato
PubMed: MeSH publication types
- Journal Article