Produtividade da soja sob fontes e épocas de aplicação de potássio

Abstract

The concept of organic production is present in almost all countries, with specific legislation, ranging from a primary vegetable and animal production to the processing and marketing of products. Shopping centers, supermarkets and even specialty stores of the genre. However, there are a number of products that need to be studied and validated for this production system to consolidate, especially when it comes to organic grains such as a soybean crop. This research, developed in the experimental area of UTFPR - Dois Vizinhos - PR, in the summer crop 2015/16, aims to evaluate the response of the use of alternative fertilizers of different solubility as a source of potassium in the soybean crop and in different times of application. The treatments construct the use of K2SO4: Potassium sulphate (48% K2O + 18% SO4); KCl: Potassium chloride (60% K 2 O); Kmag [marca registrada]: Thermopotassium (21% K2O + 21% SO4); Ekosil [marca registrada]: Thermopotassium (7% K2O); TK 47 [marca registrada]: Thermopotassium (7% K2O) at two application times (pre-sowing and V1-V2 vegetative stage of soybean cultivation). Nodulation characteristics, yield components and a production of the soybean crop were determined. It was verified that there was only lower nodulation when Kmag and TK47 were used, with the result being the control. However, the influence on the development and production factors of soybean when subjected to different sources and times of application is not observed.