Change of available phosphorus content in the structure fractions of slightly leached chernozem (Livic Phaeozem) under the effect of soil tillage systems
2004
Yankov, P. | Nankova, M. | Penchev, E. (Dobrudzha Agricultural Insitute, General Toshevo (Bulgaria))
During the period of study, the system with annual use of disking gave the highest content of available phosphorus in the 0-30 soil layer. At the end of the investigation ,enrichmentof the root-deep layer with 8,6% was established, averaged for all tillage systems. In the tillage systems used independently, a more significant increase of the available phosphorus content was registreted in constant cutting (with 60.8%) and annual plouding (with 22.9%).Increase of the available phosphorus content at depth 10-20 cm was observed in all tested soil tillage systems, including zero tillage. Difinitely, the highest amounts of available phosphorus were contained in the fractions smaller than 5 mm, mainly in the fraction 0.25 mm.
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