NITROGEN AND RICE

CLIMATE AND FOOD SECURTIY INTERNATIONAL R.R. CELL AND TISSUE CULTURE TECHNIQUES FOR CEREAL CROP IMPROVEMENT INTERNATIONAL R.R. THE INTERNATIONAL BIBLIOGRAPHY OF ON CROPPING SYSTEMS INTERNATIONAL R.R. THE INTERNATIONAL BIBLIOGRAPHY OF ON CROPPING SYSTEMS INTERNATIONAL R.R. THE INTERNATIONAL BIBLIOGRAPHY OF ON CROPPING SYSTEMS INTERNATIONAL R.R. THE INTERNATIONAL BIBLIOGRAPHY OF ON CROPPING SYSTEMS INTERNATIONAL R.R. RICE RESEARCH IN THE 1980S INTERNATIONAL R.R. COMMUNICATION RESPONSIBILITIES OF THE INTERNATIONAL AGRICULTURAL RESEARCH CENTERS INTERNATIONAL R.R.