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Previous	631.847 H343C Current status of biological nitrogen fixation research	631.85 A862R Research on the effect of different P- fertilizer forms in India within the past 20 years: A review and an attempt at a global evaluation	631.85 H236 Handbook on phosphate fertilisation	631.86 B575R Recycling of organic wastes	631.86 N277P Progress report on development and use of biofertilisers	631.86 S617P Principles of organic farming	631.86 T255B Biofertilisers	Next

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