THE DETERMINATION OF AMMONIA IN SOIL
THE INFLUENCE OF PHOSPHATE, BIPHOSPHATE, CARBONATE, SILICATE AND SULFATE OF CALCIUM, SODIUM AND POTASSIUM ON PLANT GROWTH IN ACID MINERAL SOILS
THE AVAILABILITY OF NITROGEN IN PEAT
INFLUENCE OF SULFUR OXIDATION ON SOLUBILITY OF SOIL MINERALS
THE INFLUENCE OF NITRIFYING BACTERIA ON THE GROWTH OF BARLEY 1
METHODS OF STUDYING THE STRENGTH OF SOIL ACIDS 1