Tuber Yield and Quality of Two Potato Cultivars in Response to Nitrogen Fertilizer Management

Performance of conventional and enhanced‐efficiency nitrogen fertilizers on potato tuber mineral composition and marketability

“…As observed in other studies, marketable tuber yield, protein content and soluble solids were positively influenced by increasing N rates 5,38,49 . However, N application reduced tuber P concentration, indicating that P partitioning to tubers was reduced by increasing tuber size.…”

“…The reasons for a lower starch formation in ASN+DMPP are not clear, although the greater protein content at 100% of RNR in this management may be one justification because a previous study demonstrated a negative correlation between starch‐derived sugars and tuber N compounds 46 . Another study with Agata potato reported a lower tuber starch content in the N management that resulted in a greater tuber protein concentration 5 . Furthermore, the lowered reducing sugars in potatoes receiving ASN+DMPP can be attributed to the higher intake of N in this management, where a high N supply leads to upregulation of the biosynthesis of amino acids, such as glutamine and asparagine 47 .…”

“…Therefore, N management is important for the quality and sustainability of potato production. It has been reported that potato tuber mineral composition is significantly affected by N fertilizer management 5 . The N fertilizer management is critical for better marketable tuber yield, as well as marketable attributes such as specific gravity, total soluble solids and starch in potatoes 31‐33 .…”

“…The protein content was derived from the N content in tuber DW following the method of Kjeldahl (920.87 method from Association of Analytical Chemists International – AOAC) by transforming N content in crude protein using the factor of 6.25, as reported in previous studies 4,5 . Tuber mineral concentrations (P, K, Ca, Mg, S, Fe, Cu, Mn and Zn) 29 were estimated in the ground dried samples and macro and micro nutrients expressed as g and mg kg −1 FW, respectively.…”

“…Potato ( Solanum tuberosum L.) is the most important non‐cereal food crop in the world, 1,2 and its tubers are characterized as having a relatively low dry weight (DW) (i.e., 13–22%), approximately 2% of protein content and the relevant concentration of minerals essential in the human diet, including potassium (K), calcium (Ca) and iron (Fe) 1,3‐5 . With the increased demand for sustainable food production systems, research on potato crop has not only focused on profitability goals, but also centered on improving tuber nutritional value, 1,5,6 preserving compounds during the storage, 7 and environmental quality 8,9 …”