Author:

Keywords:

water stress, drought stress, quinoa, deficit irrigation, growing degree days, Science & Technology, Life Sciences & Biomedicine, Agronomy, Agriculture, phenological development, modeling, anthesis, MODELING CHICKPEA GROWTH, SUPPLEMENTAL IRRIGATION, DEFICIT IRRIGATION, BOLIVIAN ALTIPLANO, CARDINAL TEMPERATURES, SIMULATION-MODEL, USE EFFICIENCY, SOIL, PHOTOPERIOD, GERMINATION, 0503 Soil Sciences, 0701 Agriculture, Land and Farm Management, 0703 Crop and Pasture Production, Agronomy & Agriculture, 3002 Agriculture, land and farm management, 3004 Crop and pasture production

Abstract:

Models can play an important role in agricultural planning andmanagement. Thermal time accumulation is a common way of describing phenological development in crop models, but the sensitivity of this concept to water stress is rarely quantified. The effect of pre-anthesis droughts on the timing of anthesis and physiological maturity was assessed for quinoa (Chenopodium quinoa Willd.) var. ‘Santa Maria’, with the help of two field experiments (2005–2006 and 2006–2007) in the central Bolivian Altiplano. Various treatments with different sowing dates and irrigation applications were considered. To evaluate the effect of drought stress on crop development, drought stress during the first 60 days after sowing was assessed with three different stress indicators: the number of days that the soil water content of the root zone was above a threshold, the average relative transpiration, and the sum of daily actual transpiration, standardized for reference evapotranspiration (P(Ta/ET0)). The best indicator to quantify the effect of pre-anthesis drought stress on phenological development was P(Ta/ET0) cumulated until 60 days after sowing. This indicator showed a significant logarithmic relation with the time to anthesis and time to physiological maturity. Correlations of the drought stress indicator with thermal time accumulation were better than with calendar time accumulation. Due to an effect of post-anthesis droughts, the correlations of the drought stress indicator with the time to anthesis were stronger than with the time to physiological maturity. It was also demonstrated that deficit irrigation can contribute to a better agricultural planning due to a better control of the phenological development of quinoa. The proposed relations can be used for modeling phenological development of quinoa in drought prone regions and for efficient deficit irrigation planning.