engleski

Impacts of liming with dolomite on soil reaction and availabilities of phosphorus and potassium

Four stationary liming field experiments have been started in the period from 2003 to 2006 on the acid soils in Central Croatia. Dolomite meal containing 56% CaO and 40% MgO was applied in the amounts of 0, 5, 10 and 15 t ha-1 (the experiments I and II) ; 0, 6, 12, 18 and 24 t ha-1 (the experiment III) and 0, 10, 20, 30 and 40 t ha-1 (the experiment IV). All experiments were conducted in a randomized block design in four replicates. Liming with dolomite considerably affected soil pH and plant available phosphorus status, while differences of humus contents and plant available potassium were non-significant. Initial soil pH values (pH in 1M KCl) were 4.20, 3.74, 4.60 and 5.16 for the experiments I, II, III and IV, respectively. The highest rate of dolomite increased soil pH to the level of 6.87, 6.36, 7.00 and 7.32, respectively. Initial plant available phosphorus status in the soil of the experiment I was very low (below 5.0 mg P2O5 100 g-1), in the soil of the experiment III extremely high (above 50 mg P2O5 100 g-1), while in the remaining two experiments these values were in moderate availabilities (between 15 and 20 mg P2O5 100 g-1). As affected by liming plant available phosphorus were increased for 45%, 33%, 8% and 32%, for the experiments I, II, III, and IV, respectively.

iming ; dolomite ; soil pH ; phosphorus and potassium availability

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