ORGANIC MATTER SOIL COLLOIDS 3 SOIL WATER 3 SOIL AIR 2 SOIL MORPHOLOGY 2 ACID SOIL 1 CALCAREOUS SOIL 1 CALCIUM AND MAGNESIUM 1 CHEMICAL PROPERTIES OF SOIL 1 DEVELOPMENT OF SOILS 1 EFFECTS BIOTECHNOLOGY 1 ESSENTIAL PLANT NUTRIENTS 1 FERTILIZERS 1 FUNGI 1 HISTORY OF GREEN MANURING 1 ION EXCHANGE 1 MICROBIOLOGY IN BIOTECHNOLOGY 1 NATURE AND FUNCTION OF SOIL 1 NITROGEN PROBLEM 1 NITROGEN, PHOSPHORUS, POTASSIUM AND SULFER 1 PHISICAL PROPERTIES 1 PLANT GROWTH AND NUTRITION 1 REACTION 1 RELATION BACTERIA AAAAAGRICULTURE 1 ROLE A-AGRICULTURAL BIOTECHNOLOGY 1 SOIL ACIDITY 1 SOIL AND SOIL COMPONENTS 1 SOIL AND WATER 1 SOIL BIOLOGY 1 SOIL CLASSIFICATION 1