NITRATE ASSIMILATION BY SOIL MICROÖRGANISMS IN RELATION TO AVAILABLE ENERGY SUPPLY
THE INFLUENCE OF MANURES AND ORGANIC RESIDUES ON PLANT GROWTH
PRODUCTION OF NODULES ON DIFFERENT PARTS OF THE ROOT SYSTEMS OF ALFALFA PLANTS GROWING IN SOILS OF DIFFERENT REACTION
SOIL PHOSPHORUS STUDIES
SOIL PHOSPHORUS STUDIES
SOIL PHOSPHORUS STUDIES
THE DELAYED EFFECT OF LIMING