The effect of potassium fertilisation on the molybdenum and boron content and uptake by field pea organs was investigated. The field experiment was established at the experimental unit of the Siedlce University of Natural Sciences and Humanities. The experimental design was  a completely randomised arrangement with four repetitions. The first factor included five levels fertilisation with potassium (NK 0-0; NK 1-41.5; NK 2-83; NK3-124; NK 4-166; NK 5-207.5 kg ha-1), and the second factor consisted of two years of research (2011 and 2012). Every year in spring, nitrogen was applied in the quantity of 20 kg ha-1. There was no phosphorus application (a very high content of available phosphorus in the soil). The applied potassium fertilisation significantly differentiated the molybdenum and boron content of the field pea seeds, straw, deseeded pods and roots. The study determined the highest molybdenum content (7.71 mg kg-1 DM) in the field pea seeds collected from the plots fertilised with NK1, and the greatest boron content in deseeded pods (27.41 mg kg-1 DM) collected from the plots fertilised with NK2. The lowest molybdenum content was determined in deseeded pods, and the lowest boron content was in the field pea seeds. The average molybdenum content (in mg kg-1 DM) in test plants can be presented in the following decreasing order: seeds (6.79) > roots (1.99) > straw (1.47) > deseeded pods (1.39), and for boron: deseeded pods (24.34) > straw (20.15) > roots (15.56) > seeds (7.53). The total molybdenum content of the soil ranged from 0.11 to 0.15, and the total boron content ranged from 2.70 to 3.23 mg kg-1 soil.

25.1.2020