Dynamics of the nutrient absorption in the potato crop (Solanum tuberosum) Superchola variety, for pre-basic seed production
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Abstract
Nutrient uptake curves are essential in fertilization planning to achieve high yield and production quality. The research was carried out at the Santa Catalina Experimental Station (EESC) of the National Institute of Agricultural Research (INIAP - Ecuador). The research objective was to determine the nutrient absorption curves (N, P, K, Ca, Mg and S) in the production of pre-basic potato seed with different nutrient solutions under greenhouse conditions, evaluated in soil as the substrate and with seedlings obtained from cuttings of the Superchola variety. Five nutritional solutions were evaluated: The control (T1), Rational Method (T2), INIAP method (T3), Steiner method (T4) and Pilvicsa method (T5). These treatments were implemented in a completely randomized design. Variables evaluated were: total dry plant biomass, nutrient absorption (in four phenological stages) and yield. The highest amount of plant biomass was obtained with the nutritional solution T5 with 205.68 mg plant-1. The highest nutrient absorption of N, P, K, Ca, Mg and S of 4.4, 0.97, 8.25, 1.57, 0.52 and 0.55 g plant-1, respectively, were also obtained with the nutritional solution T5. The highest yield of 10.73 t ha-1 and 10.63 t ha-1 were obtained with the nutrient solutions of T5 and T4, respectively. The logistic model presented a determination coefficient of around 90%. In conclusion, the nutrient solution T5 (Pilvicsa) presented the highest plant biomass, nutrient uptake and yield.
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