Effect of Thermo-Tribochemical Activated Natural Phosphates on Productivity and Nutrient Uptake of T. aestivum L.

1 Dobroudja Agricultural Institute, BG - 9700 General Toshevo, Bulgaria
2 University of Chemical Technology and Metallurgy, BG- 1574 Sofia, Bulgaria


NANKOVA, M., I. DOMBALOV and K. KOSTOV, 2007. Effect of thermo-tribochemical activated natural phosphates on productivity and nutrient uptake of T. aestivum L. Bulg. J. Agric. Sci., 13: 691-701

In a vegetation pot experiment (Luvic Faeozem) the effect of thermo-tribochemically activated (TTCA) natural phosphorites (Tunisian and Morocco) and dicalcium phosphates - industrial and waste (DCPi and DCPw ) on yield and uptake of nutrients in three T. aestivum L. varieties (Aglika, Kristal and Svilena) was investigated. These were introduced in soil independently and in combination with fertilizer additive [(NH4)2SO4 + KCl + dolomite].
Clear genotype specificity was established in the productivity of its elements, as well as in nitrogen, phosphorus and potassium uptake. Variety Svilena responded positively to the independent introduction of DCP (industrial and waste), and the effect of the introduction of Morocco phosphorites was equal to the effect of triple super phosphate. Tunisian and DCP (industrial and waste) proved most unsuitable for variety Aglika. Regardless of the lower absolute yield values of variety Aglika, the positive response to the introduction of P-sources was highest. Variety Kristal was less responsive in comparison to Svilena and Aglika. Grain yield from this variety was highest after fertilization with DCP (industrial and waste) in combination with fertilizer additive.
The independent effect and the interaction of the factors “fertilizer source” and “variety” was highest in GHI and absolute grain weight. The mean productivity of the varieties increased with 9.2% as a result from the combining of TTCA P-sources with fertilizer additive in comparison to their independent application. The effect of this combination was most evident in variety Svilena. Activated waste DCP as a phosphate source was equal or slightly conceding to triple super phosphate.
This phosphate source contributed to the increased uptake of nitrogen and potassium in the total shoot mass formed with 15 % for both elements, as compared to the independent use of TTCA P-sources. The activation of waste DCP from the production of gypsum lead to the uptake of greater phosphorus and potassium amounts in wheat in comparison to fertilization with triple super phosphate.

Key words: thermo-tribochemically activation, natural phosphorites, dicalcium phosphates (industrial and waste), genotypes, nutrient uptake

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