THE EFFECT OF DIFFERENT FORMS OF SULPHUR ON ITS CONTENT IN PLANTS
Background. In addition to N, P and K, S is a valuable plant nutrient that determines the size, and quality of harvested crop yields. Its deficiency leads to lower yields of plants and deterioration of their quality parameters.
Material and methods. The research was aimed to determine the effect of S fertilizer in various forms on the content of this component (Stot and SO4-S) in the dry matter (DM) of tested plant species: spring wheat (Triticum aestivum L.), white mustard (Sinapis alba L.), spring oilseed rape (Brassica napus L. var. napus), spring barley (Hordeum vulgare L.) and orchard grass (Dactylis glomerata L.). The study was performed based on a strict three-year pot experiment. The variable factor was S applied in seven different forms, plus the control – without S fertilization. The subject of the research were treatments: the control – without S fertilization (1); RSMS – sulphate-urea solution with addition of Na2S2O3·5H2O (2); (NH4)2SO4 (3); K2SO4 (4); Na2SO4 (5); elemental sulphur (S-S°) (6); CaSO4·2H2O (7); H2SO4 (8).
Results. The highest content of total sulphur occurred in the vegetative and generative parts of spring wheat fertilized with sulphur in the form of RSMS. In barley and orchard grass, similar trends were found after the application of K2SO4, H2SO4 and CaSO4·2H2O. The most favourable form of sulphur applied for the total sulphur concentration in the vegetative parts of white mustard and spring oilseed rape was RSMS, for white mustard seeds – S-S° and H2SO4, while for the generative parts of spring oilseed rape – K2SO4. Among the used forms of S nutrition, the largest impact on SO42--S content was exerted by this component application as RSMS (in spring wheat, white mustard seeds, spring barley grains), K2SO4 (straw of white mustard, seeds of spring oilseed rape) and S-S° (straw of spring barley, orchard grass).
Conclusion. Among the sulphur forms used, the largest amounts of total sulphur were found in the dry matter of the tested plants in which RSMS, K2SO4, H2SO4 and CaSO4·2H2O were used in cultivation. However, in the case of sulphate sulphur, this referred to the use of RSMS, K2SO4 and S-S°.