Resumo

ULLOA, Marcelo Calvache  e  VALLE, Luciano. Harvest index with macro-nutrients in quinoa grain (Chenopodium quinoa Willd). Rev. Inv. Cs. Agro. y Vet. [online]. 2021, vol.5, n.13, pp.15-28. ISSN L:2664-0902.  https://doi.org/10.33996/revistaalfa.v5i13.95.

In the Inter-Andean Valleys of Ecuador between 2000 and 3000 meters above sea level, there are low quinoa yields with high risk due to the variability of the climate and the sowing of landraces with inadequate management practices. The investigation amounts of nutrients extracted by three varieties of quinoa (Chenopodium quinoa Willd) were determined during the development of the crop. The objetive was to determine the amounts of nitrogen, phosphorus, potassium, calcium and magnesium that the quinoa plant extracts during its life cycle. Three varieties of quinoa were evaluated, the amount of dry matter, percentage of nutrients under study and amount of nutrient in kg ha-1 of the samples taken in leaves, stems and panicles were determined at 20, 40, 60, 80, 100 and 120 days after sowing. The results obtained indicate that the Imbaya variety with the dose 150-80-40 of N, P, and K showed a greater amount of accumulated dry matter in the total plant with 9870 kg ha-1 at 120 days after sowing (dds). The nutrients most absorbed by the quinoa plant were K and N followed by Ca, Mg and P in this order. The harvest indices (IC) obtained were N = 0.63; P = 0.64; K = 0.55; Ca = 0.52 and Mg = 0.65. The application of the fertilizer in the quinoa crop must be carried out in three seasons: at sowing, at weeding at 30 days and at hilling at 50 days of crop age.

Palavras-chave : Accumulation; extraction; quinoa; nutrients.

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