Dynamics of the quantities of N, P, K, Ca and Mg, and of Zn, Cu, Mn and Fe in the phytomass of mesoxerothermic grass ecosystems, developing on smolnitza in the region of the Sofian field
2001
Georgiev, N. (Institut po Botanika - B"lgarska Akademiya na Naukite, Sofia (Bulgaria)) | Markov, E.
There are investigated the quantities of the macrobiogenic elements of N, P, K, Ca and Mg, and microbiogenic elements Zn, Cu, Mn and Fe in the fractions of the plant mass (green phytomass, dry mass and spread) during the vegetation period. The periods (mounts) with maximal accumulation of macro and microbiogenic elements in the different fractions are established. The highest quantities of the studied macrobiogenic elements in the total phytomass mass (green phytomass+dry mass+ spread) are contained in June (N=83.4, P=9.21, K=80.06, Ca=55,74 and Mg=10.33 t/ha). In the green phytomass the highest quantities are contained in June (N and P) and in July (K,Ca,Mg), which are: N=83,4, P=87,1, K=93,3, Ca=84,1 and Mg+89,4% duly from the summary quantities accumulated in the total phitomass during the mount. The content of the studied microbiogenic elements in the green phytomass, dry mass and spread during the vegetation period is below the critical toxicity concentrations.
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