MACRONUTRIENT CONTENT AND RATIOS IN QUINOA SEEDS (Chenopodium quinoa WILLD.) DEPENDING ON SULPHUR FERTILISATION

Abstract

Background. The present study concerns the species quinoa (Chenopodium quinoa Willd). The aim of the study was to evaluate the effect of fertilizer sulfur on the formation of mineral composition and quantitative proportions of major nutrients in quinoa seeds.
Material and methods. Titicaca variety of quinoa was used for the study. A one-factor field experiment was established in four replications. The factor examined was the variation in sulphur fertilisation. This component was applied pre-sowing in spring in the form of Wigor S fertilizer in the amount of: 0 (control), 20, 40 and 60 kg S·ha-1.
Results. The study showed that in the years with significantly lower precipitation the contents of nitrogen, potassium, phosphorus, magnesium and calcium in seeds were generally lower. Their highest contents were found in the year with high precipitation. Sulphur fertilisation in respective years of vegetation generally significantly increased the nitrogen and calcium contents in quinoa seeds, to a lesser extent it was also true for magnesium. The content of phosphorus under these conditions increased in the quinoa seeds only in one year of the study, while the content of potassium under affected by sulphur application generally decreased. There was no significant effect of sulphur fertilisation on the values of ionic ratios (K+:Ca2+, K+:Mg2+, (K++Na+):(Ca2++Mg2+)), however, differences were observed in respective years of the study.
Conclusion. A correlation was found between the mineral composition of quinoa seeds and weather conditions during the vegetation period. Under conditions of high moisture of the soil high doses of sulphur increased the content of most of the elements studied in quinoa seeds. In drier years the effect of sulphur on macronutrient content was less.

Published
Dec 8, 2021
Section
Original paper