Abstract

MARQUEZ FERNANDEZ, Diego Manuel; FERREIRA AGUERO, Marcos Arturo; MEZA GIMENEZ, Wilfrido  and  PAREDES FERNANDEZ, José Quinto. Soybean production (Glycine max, L) as a function of different doses of simple superphosphate: yield parameters and damage caused by stink bugs. Investig. Agrar. [online]. 2023, vol.25, n.1, pp.26-31. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2023.junio.2501743.

Phosphorus (P) is one of the fundamental elements for the development of soybean. An inadequate supply in the plant could seriously limit production. In the experimental field of the Faculty of Agrarian Sciences, Pedro Juan Caballero Branch of the National University of Asunción, located in the Cerro Corá District, on an Alfisol, an experiment was installed to evaluate the effects of the application of different simple superphosphate dose in soybean yield and damages. Significant differences were found between the control and the fertilized treatments in terms of yield parameters, with an increase in grain yield according to the increase in the applied phosphorus dose, adjusting to a linear equation. The average production of grains in kg ha-1 was 3,837.50, 4,148.61, 4,290.28, and 4,455.56 kg ha-1 for doses of 30, 60, 90, and 120 kg ha-1 of P2O5 respectively, being the mean obtained in the control equal to 3,527.78 kg ha-1. Significant differences were found between the control and the fertilized treatments in terms of the percentage variable of pods attacked by bedbugs and healthy pods. Healthy plants have been verified, without attack or punctures in higher doses of P2O5.

Keywords : Soy; fertilization; phosphorus; dosage; yield.

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