In this revised edition, the chapters on pesticides and biotechnology in agriculture have been redone and brought up to date. Recent developments in other areas have also been incorporated.
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Preface to the Fourth Edition v
Soil the Natural Medium for Plant Growth
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actinomycetes activity agar Agricultural amino acids antibiotics antigen Azolla Azospirillum Azotobacter Bacillus bacteria bacterium bacteroids Beijerinckia biological blue-green algae carbon Casuarina cell wall chemical clover compounds containing crop degradation Delhi disease Distilled water ectomycorrhizae electron enzyme fertilizers field fix nitrogen fluorescent formation Frankia fungal fungi Fusarium ganisms genera genetic Gram herbicides heterocysts host hyphae IBH Publishing inoculation isolated known leghaemoglobin legumes medium membrane method microbial Microbiology microorganisms microscope nif genes nitrogen fixation nitrogen-fixing nitrogenase nutrients organic matter Oxford and IBH oxidation oxygen pathogens pesticides phosphate phosphorus phyllosphere plant growth plasmid plates production protein Pseudomonas pure cultures reaction resistance rhizobia Rhizobium rhizosphere rice root exudates root hair root nodules root system seed seedlings soil microorganisms soybean species spores sterilized strains Streptomyces structure Subba Rao substrate sulphur surface symbiosis technique temperature tion tissue transgenic plants trifolii tube virus viruses wheat yeast