The impacts of nitrogen use efficiency of potato genotypes on environmentally friendly raw material production for starch processing
2023
Skrabule, Ilze | Rabante-Hane, Lasma | Dimante, Ilze | Taskova, Inese | Sviatchenko, Sergii
Potato starch production in Latvia is increasing as demand for this product is growing due to the outstanding properties of potato starch, such as superior water binding capacity, good clarity and neutral flavour. The production of raw material using varieties with improved nitrogen use efficiency (NUE) is essential for optimal farming systems to reduce environmental pollution. The aim of this study was to detect the NUE of genotypes and to evaluate the impact of NUE on starch content in tubers (SC), tuber yield (TY) and starch yield (SY). The production of potato was evaluated in organic and integrated farming with three different nitrogen supplies over two years. The NUE of genotypes was estimated as the tuber dry matter yield per available nitrogen. The genotype impact on TY as partitioning of variance components (PVC) was 24 and 34% in all environments in 2020 and 2021, respectively. SC was mostly determined by genotype and PVC was 83 and 84% in 2020 and 2021, respectively. The impact of genotype on NUE was only 29 and 20% (PVC in 2020 and 2021), respectively. The relationship between TY and SC was not significant (p is greater than 0.05) in both years, and NUE and SC correlated insignificantly (p is greater than 0.05), with some exceptions. The correlation of SC and SY was significant (p is less than 0.5) and positive. NUE correlated positively and significantly with TY and SY. In conclusion, the raw material for potato starch processing was determined by TY, and SY was determined by SC. The higher NUE provided an increase in TY and SY but did not influence SC.
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