1911, 1911 Encyclopædia Britannica Chapter S:1911 Encyclopædia Britannica/Agriculture/History of English Agriculture, It was about this time that the first experiments were made (in Germany) with basic slag, a material which had hitherto been regarded as a worthless by-product of steel manufacture. A year or two later field trials were begun in England, with the final result that basic slag has become recognized as a valuable source of phosphorus for growing crops, and is now in constant demand for application to the soil as a fertilizer.
A side effect.The many Indian restaurants all over Britain are a by-product of the large waves of immigration from the subcontinent.
