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4. Rezultati ovih istraživanja ukazuju nam da se opisanim metodama primjene P´1-´ može doći do brzih rezultata o njegovoj penetraciji u rizosferu što je prikladno za indikaciju površinske gnojidbe tla s fosfornim gnojivima. Vrijednost se tih metoda očituje u nenarušavanju prirodne građe tla kao i u brzini dobivanja rezultata, tj. već jedan sat poslije dodavanja doze P32 na površinu tla. LITERATURA 1. Sokolov, A. V. i Serdoboljski, J. R.: Primena radioaktivnih izotopa fosfora u agrokemijskim istraživanjima. Akademija nauka SSSR, Moskva 1954 (prijevod). 2. Olson , R. A.: Developments in Atomic Science in Soil and Plant Research in Europa and United States, E. P. A., O. E. E. C. Paper No 6, 1958. 3. Schuf f el en, A. C: Radioisotopes in Soil Research, E. P. A., O. E. E. C, 1958. 4. Furl an, J.: Primjena radioizotopa P32 kod određivanja izmjenljivog fosfora tala, Saopštenje na Konferenciji poljskih i jugoslavenskih stručnjaka o primjeni N E u poljoprivredi, šumarstvu i veterini, Beograd 1959. 5. Rubner , K.: Die pflanzengeographischen Grundlagen des Waldbaues, Radebeul- Berlin 1960. 6. Borland, J. W. and Reitemeier, R. E.: Kinetic Exchange Studies on Clays with Radioaktive Calcium, Soil Science 69, 1960. 7. Draganić , I.: Radioaktivni izotopi i zračenja, II i III, Naučna knjiga, Beograd 1963. 8. Fiedler, H. J. und H o e h n e, H.: Vorkommen und Gehalt der Makronährstoffe in Waldbäumen, Wissenschaftliche Veröffentlichungen aus der Fakultät für Forstwirtschaft Tharandt der Technnischen Universität Dresden, (F)-Reihe Nr. 33, 1965. 9. Cestar, D., K a 1 i n i ć, M., Milković, S. i P e 1 c e r, Z.: Gospodarske jedinice Veljun, Tržićka šikara i Zalije, Ekološko-gospodarski tipovi i meliorativni zahvati, Tipološko istraživanje i kartiranje šuma i šumskih staništa SR Hrvatske, Svezak I, Zagreb 1966. Summary A CONTRIBUTION TO THE KNOWLEDGE OF .PENETRATION OF PHOSPHORUS (P3>) IN SOME SOILS OF CROATIA ON WHICH ARE ESTABLISHED PLANTATIONS AND ACCELERATED CULTURES OF FOREST TREE SPECIES In the work the authors attempt to present an up-to-date and rapid field- laboratory method for the following-up of the penetration of phosphorus from the soil surface into the rhizosphere. A knowledge of phosphorus penetration is indispensable in surface manuring with phosphorus fertilizers, which is applied in plantations and accelerated cultures of forest tree species. The paper includes an introduction, a presentation of the problem, a description of the object of investigation, the working methods, results of the investigation, a discussion and conclusions. The objects of the investigations were chosen in the area which according to Köppen´s climatic classification belong to the climatic type designated by the formula Cfwbx«, while as to the soil types were selected: a pseudogley soil at Cerje near Dugo Selo, an alluvial soil at Jaždovac near Lučko, and a lessive heather- bracken soil at Zalije near Ogulin. The results of laboratory analyses of the mentioned soil types are presented in Tab. 1. In the chapter »Working method« the field and laboratory application of labelled phosphorus P:i- in the form of KH_>P:!2Oi was described. In Photo 1 is visible the placement of plastic soil sampling cylinders within the profile of the soil being |