studia universitatis babeş-bolyai biologia 2

PHOSPHATASE ACTIVITIES IN A BROWN LUVIC SOIL
6. Farmyard-manuring – in comparison with mineral (NP) fertilisation –
proved to be more efficient in increasing phosphatase activities in soil layers under
maize in the 6-crop rotation.
7. The enzymatic indicators of soil quality calculated from the values of
phosphatase activities determined in the plots of the 6-crop rotation showed the
order: farmyard-manured maize > minerally fertilised (m.f.) soybean > m.f. clover >
m.f. maize (plot 4) > m.f. wheat > m.f. maize (plot 1). This order means that by
determination of phosphatase activities valuable information can be obtained regarding
the fertility status of soils.
REFERENCES
1. Cosgrove, D.J., Metabolism of organic phosphates in soil, in McLaren, A.D.,
Peterson, G.H. (Eds.), Soil Biochemistry, Vol. 1, pp. 216-228, Dekker, New York,
1967.
2. Cosgrove, D.J., Microbial transformations in the phosphorus cycle, in Alexander,
M. (Ed.), Advances in Microbial Ecology, Vol. 1, pp. 95-134, Plenum Press, New York,
1977.
3. Drăgan-Bularda, M., Lucrări practice de microbiologie generală, pp. 167-169,
Univ. Babeş–Bolyai, Cluj-Napoca, 1983.
4. Gianfreda, L., Bollag, J.-M., Influence of natural and anthropogenic factors on
enzyme activity in soil, in Stotzky, G., Bollag, J.-M. (Eds.), Soil Biochemistry, Vol.
9, pp. 123-193, Dekker, New York, 1996.
5. Halstead, R.L., McKercher, R.B., Biochemistry and cycling of phosphorus, in Paul,
E.A., McLaren, A.D. (Eds.), Soil Biochemistry, Vol. 4, pp. 31-63, Dekker, New York,
1975.
6. Kiss, S., Drăgan-Bularda, M., Rădulescu, D., Biological significance of enzymes
accumulated in soil, "Adv. Agron." (New York), 27, 1975, 25-87.
7. Öhlinger, R., Phosphomonoesterase activity with the substrate phenylphosphate, in
Schinner, F., Öhlinger, R., Kandeler, E., Margesin, R. (Eds.), Methods in Soil
Biology, pp. 210-213, Springer, Berlin, 1996.
8. Ramírez-Martínez, J.R., Organic phosphorus mineralization and phosphatase
activity in soils, "Folia Microbiol." (Prague), 13, 1968, 161-174.
9. Sachs, L., Statistische Auswertungsmethoden, pp. 140, 309-310, Springer, Berlin, 1968.
10. Samuel, A., Kiss, S., The effects of soil management practices on the enzymatic activities
in a brown luvic soil, "Stud. Univ. Babeş–Bolyai, Biol.", 44 (1-2), 1999, 189-197.
11. Speir, T.W., Ross, D.J., Soil phosphatase and sulphatase, in Burns, R.G. (Ed.), Soil
Enzymes, pp. 197-250, Acad. Press, London, 1978.
12. Ştefanic, G., Enzimologia solurilor cultivate, in Kiss, S., Ştefanic, G., Paşca, D.,
Drăgan-Bularda, M., Zborovschi, E., Crişan, R., Enzimologia mediului înconjurător,
Vol. 1, pp. 83-84, Ceres, Bucureşti, 1991.
13. Ştefanic, G., Eliade, G., Chirnogeanu, I., Researches concerning a biological
index of soil fertility, "Fifth Symp. on Soil Biology (Iaşi, 1981)", Rom. Natl. Soc. Soil
Sci., Bucharest, 1984, 35-45.
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