(1964) Laskowski, S.; Zawistowski, F.; Krużycka, M.; Wyższa Szkoła Rolnicza w Szczecinie. Katedra Ogólnej Uprawy Roli i Roślin; Wyższa Szkoła Rolnicza w Szczecinie. Z R.R.Z.D. w Starym Polu; Wyższa Szkoła Rolnicza w Szczecinie. Z R.R.Z.D. w Starym Polu
Investigations carried out in 4 years (1957-1960) on a set field in R.R.Z.D. Stare Pole have brought evidence that even layers of heavy alluvials are in spring time lacking oxygen. In the lower parts of the soil profile the period of optimal moisturing begins late, not till the middle of June, and lasts till the third decade of September. The high water levels occuring in the layers under arable soil in the Żuław alluvials exercise detrimental influence on the incre ase of organic mass as well as on the yields.