Agriculture Bytes | VOL.12, ISSUE 73 JULY-AUGUST 2012

Facts of Soil

An average soil sample is 45 per cent minerals, 25 per cent water, 25 per cent air, and 5 per cent organic matter. Different-sized mineral particles, such as sand, silt, and clay, give soil its texture. Soil is approximately 46 per cent oxygen, 28 per cent silicone, 8 per cent aluminum, 5 per cent iron, and 4 per cent calcium. (CRC Handbook of Chemistry and Physics, 77th Edition). The most important plant nutrients are nitrogen (N), phosphorous (P), and potassium...

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