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a) How was fertilisation achieved before the introduction of chemicals? Hence, How are furrows produced and...

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Biology

a) How was fertilisation achieved before the introduction ofchemicals? Hence, How are furrows produced and what effect do theyhave on agriculture?

b)What was the global impact of the Haber-Bosch process? Hence,if you can, please draw an Archimedes screw showing how it worksand the direction of movement & flow.

thanks

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Through centuries of ancient and medieval times men have been deeply interested in improving crop yields by the addition of various mineral or organic substances Until the last 200300 years however the approach to the subject was highly empirical it was found by accident or by trial and error that applications of    See Answer
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