Effect of sulphur fertilisation on seed yield and yield components of broad bean on the background of different levels of potassium content in soil

The aim of the study was to determine the yield reaction of broad bean, which is treated as a model plant for the entire group of leguminous plants, on variation in the soil potential to supply plants with potassium and sulphur . From 2010 to 2012 we carried out a field experiment, which was part of a static experiment . The study is an assessment of the influence of two factors: I – the content of potassium in the soil and current fertilisation with this component (K-0; K-25%; K-50% and K-100%; where 100% = 133 kg K∙ha-1); II – fertilisation with elementary sulphur (0, 25 and 50 kg S∙ha-1) . The experiment proved that the reaction of broad bean to the potassium treatments depended on the vegetative season . The highest productivity of potassium was observed in the most humid vegetative season . The influence of sulphur fertilisation on plants depended on the potassium fertilisation system . The highest increase in the seed yield was noted in treatment K-0, i .e . in the soil with the smallest amount of available potassium . Sulphur fertilisation decreased the yield of seeds in the soil with the highest amount of potassium (K-100%) . This factor did not have significant influence on the content of total protein in the seeds .