Potassium Mobility In Soils Under Different Doses And Forms of Application and Source Culture Performance Potential (Glycine max (L.) Merrill.)

Abstract

Potassium (K) is the second nutrient that soybean crops need to perform their vital functions and improve crop performance. Due to the level of high doses and increase of no-tillage areas in recent years, there have been some changes in the application of this nutrient. Thus, the objective of this work is to analyze the potassium mobility in the soil and the yield potential of soybean due to the addition of doses of potassium chloride submitted to different forms of application. The experiment was conducted in the 2017/2018 harvest, in the experimental area of Renner Property, in the interior of Maravilha - SC. The experiment was carried out in a randomized complete block design in a 3x4 factorial scheme, with four doses of potassium chloride (KCl), (0, 50, 100 and 150% of the K₂O dose), and three forms of application (the sowing of soybeans, at the base, in the sowing groove, application in cover after sowing). The weight of one thousand soybean seeds, soybean yield, number of pods per plant, number of grains per pod and K content in the soil in the 0-10 and 10-20 cm layers were evaluated. The application dose form of K did not interfere in the yield of the crop, justifying the application in the base, resulting in lower costs to the farmer and lower kneading of the crop.