The effect of different rates and forms of sulphur applied on changes of soil agrochemical properties
Skwierawska, M.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Agricultural Chemistry and Evironmental Protection | Zawartka, L.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Agricultural Chemistry and Evironmental Protection | Zawadski, B.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Agricultural Chemistry and Evironmental Protection
A three-year field experiment was conducted from 2000 to 2002 in North-East Poland. Each year three sulphur fertilization rates in the form of sulphate (S-SO2-4) and pure (S-S0) sulphur were applied: 40, 80 and 120 kg/ha. In the soil horizon at the depth of 0-40 cm the triple rate of S- and S-S0 depressed soil reaction. Acidification of soil caused by S-SO2-4 became evident already in the first year of the study while that resulting from S-S0 application appeared as late as in the third year. The effect of sulphur on soil in the 40-80 cm horizon was irregular. As the sulphur rates increased and the duration of the experiment progressed, sulphates accumulated in soil. In the 0-40 cm soil layer, the increasing rates of sulphur tended to increase the content of N-NH+4. In most objects, the NPK + S fertilization, and especially the single S-SO2-4 treatment, caused an increase in N-NO-3 in both soil layers compared with the NPK fertilized object. The dose of 120 kg/ha S-SO2-4 caused a significant increase in the concentration of available phosphorus in soil in the 0-40 and 40-80 cm layers.
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