Author: ,
p-ISSN: 0024-9602, e-ISSN:2582-5321, Vol: 3, Issue: jun-jun,
Up to 1840 farmyard manure held undisputed sway as a fertiliser. It was known that plants contained metallic consti tuents, and that certain metallic compounds were useful ferti- lisers, but in as much as organic matter was the chief constituent of plants
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