THE EFFECT OF NODULE BACTERIA ON THE YIELD AND NITROGEN CONTENT OF CANNING PEAS
THE FORMATION OF NODULES BY DIFFERENT VARIETIES OF SOYBEANS
SULFUR AS AN IMPORTANT FERTILITY ELEMENT
RELATION BETWEEN HEAT OF WETTING, MOISTURE EQUIVALENT AND UNFREE WATER
SULFUR AS A FERTILIZER FOR COTTON
ADSORPTION OF PLANT FOOD BY COLLOIDAL SILICA
INFLUENCE OF HYDROGEN-ION CONCENTRATION ON THE ADSORPTION OF PLANT FOOD BY SOIL COLLOIDS
OXIDATION OF ZINC SULFIDE BY MICROÖRGANISMS
MODIFICATIONS OF THE SOIL FLORA INDUCED BY APPLICATIONS OF CRUDE PETROLEUM
ACID PHOSPHATE PRODUCTION BY THE LIPMAN PROCESS
A NEW METHOD OF MECHANICAL ANALYSIS OF SOILS
INDEX