Portch,Sam. Systematic approach to soil fertility evaluation and improvement. Modern Agriculture and fertilisers.
Chicago Edition CitationPortch,Sam. Systematic Approach to Soil Fertility Evaluation and Improvement. Modern Agriculture and fertilisers.
MLA Edition CitationPortch,Sam. Systematic Approach to Soil Fertility Evaluation and Improvement. Modern Agriculture and fertilisers.
Warning: These citations may not always be 100% accurate.