Productive characteristics of quinoa (Chenopodium quinoa Willd.) under irrigation and potassium fertilization

Abstract

Quinoa (Chenopodium quinoa Willd.) quickly adapts to different climatic conditions; however, low soil fertility conditions and inadequate soil water levels may reduce yield. The objective of this study was to evaluate the effect of irrigation levels and potassium fertilization for quinoa production in the Cerrado Oxisol. The experiment was performed in a greenhouse, located at the Federal University of Mato Grosso (UFMT), Campus of Rondonópolis -Brazil, using soil collected from a Cerrado Oxisol. The experimental design was a randomized complete block design in a 5x5 factorial scheme with four replicates, corresponding to five potassium doses (0, 100, 200, 400 and 600 mg dm -3 ) and five irrigation levels (50, 75, 100, 125 and 150% of field capacity). The variables of dry mass of shoot, dry mass of roots, water use efficiency, mass of 100 grains, production and number of grains were analyzed. The dry mass of the aerial part and the roots are influenced by the potassium fertilization in the doses between 530 and 600 mg dm -3 . All the vegetative and productive characteristics were affected by the treatments. The highest water use efficiency was observed at the potassium (K 2 O) dose of 375 mg dm -3 and a 50% irrigation level.

Effect of Nitrogen and Potassium on Growth, Yield, and Seed Quality of Quinoa in Ferralsols and Acrisols under Rainfed Conditions

“…In the red river delta in Vietnam, under normal and saline stress conditions of an alluvium soil, the growth parameters, and yield components increased according to the increase of the N application rates from 0 to 90 kg N ha -1 , then decreased when the nitrogen rates were higher (Dinh et al, 2015(Dinh et al, , 2021. Conducting a green-house experiment, Rêgo et al (2017) found linear correlations of K application rate with the shoot and root dry mass, but polynomial correlations with the number of grain and grain production in quinoa. The grain yield of quinoa increased significantly when the K application rate was raised up to 120 kg ha -1 , then slightly decreased by the application at the rate of 180 kg ha -1 (Salim et al, 2019).…”