Historian N.S.B. Gras outlines six major stages of agricultural development: 1. Natural husbandry 2. The fallow system 3. Legume rotation 4. Field-grass husbandry 5. Scientific rotation 6. Specialized intensive All responses to the challenge of fertilityhttps://rootsofprogress.org/six-stages-of-agriculture …
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Rainwater contains small amounts of nitrogen in the form of nitrogen gas (N2), ammonium (NH4) and nitrates (NOx).
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