Phosphorus of sod-podzol soil aggregates on the slope

The original data of chemical analyses of mobile phosphorous, organic carbon, mineral and organic phosphorus, and also the X-Ray Analyse of total phosphorus. All the analyse wore made in four groups of aggregates (>5 ; 5-2; 2-1;,<1 mm) . The data about amont of aggregates in each of sample was also added. Our hypothesis is claimed, that agronomical valuable aggregates protect P in soils from soil erosion. Mobile phosphorous, mineral phosphorous and total phosphorous mostly accumulated at the top of the slope. Down the slope, their content decreases considerably, without significant differences between the soil at the slope and at the foot of the slope (p-value < 0.05). Moreover, the examination of water-stable aggregates leads us to conclusion, that water-regime on the slope and in the bottom of the slope is the main reason of phosphorus removal. The air-dry different sized aggregates mostly contain approximately equal amounts of mobile and total phosphorous. Then aggregates measuring 5-2 millimeters in diameter preferentially accumulate mineral phosphorus, so agronomical valuable aggregates play a major role in mineral immobile phosphorous compounds accumulation.