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

Abstract

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. © 2021 Society of Chemical Industry.

Mineral nutrient variability of potato (Solanum tuberosum L.) tubers with different colors grown in Niksar, Kazova and Artova locations of Tokat Province, Turkey

“…The significant differences in Fe content, as in other micronutrients, can be attributed to the differences in soil properties as well as micronutrient contents of the experimental sites. The findings of Souza et al (2022) on differences in Fe, Zn, Cu, and Mn contents of potato grown in three different locations are in agreement with the current study.…”

“…The P content in different locations was significantly higher in Artova, where many other nutrients were at their highest levels. The P content of potatoes grown in three different locations of Sao Paola, Brazil (ranging between 0.55 and 1.05 g kg −1 ) was lower ( Souza et al, 2022 ) than the P contents recorded in this study. The researchers indicated that high nitrogen applications reduced the P content of tubers while increasing tuber size.…”

“…Aside from genetic influences on mineral content, the growing environment has a significant effect on potato mineral nutrient composition. The highest K and Mg concentrations in potato tubers were obtained in urea applications among six different nitrogen fertilizer sources in Sao Paolo State, Brazil ( Souza et al, 2022 ). The flesh color of potatoes is affected by the growing environment, the climate of the region, fertilizers used during the growing period, as well as pest and disease control practices affecting the health conditions of plants.…”

Effect of growing season on some qualitative and functional attributes of different potato genotypes

“…Consequently, the soluble solids content during the SCS and LCS was 4%−20% and 8%−50% higher, compared to El Beidha and Naima, respectively. These findings align with previous studies by Soares et al (2016) on the cultivar Ágata, which reported a content of 5.75% at full physiological maturity, as well as by Souza et al (2022) in a fall-winter growing seasons and three site-years field study in São Paulo State, Brazil. Similarly, Ilahy et al (2019) observed soluble solids values ranging from 4.1 to 5.2 ˚Brix and from 4.6 to 6.8 ˚Brix in selected potato clones grown under two different growing seasons.…”

“…Hel-gerud et al (2015) reported average TDM values from 19.1% to 28.1% for 240 potatoes from seven different cultivars obtained from either commercial suppliers or local potato processing industry. Souza et al (2022) observed a similar average tuber dry weight of 18.5% under different fertilization regimes during the fall-winter growing season in Brazil. Haverkort and Verhagen (2008) reported that daily growth is reduced above day/night temperatures of 27/15˚C due to increased respiration, with dry matter distribution mainly favoring foliage, and tuber dry matter concentration unacceptably low, especially for processing purposes.…”