Hi Keith,
Re the nitrogen issue: there is another way in which
exhausted land can be rejuvenated. Crop rotation is the biblical method
whereby an area of land is left fallow each year and "rotated" year by year
through a preset planting and fallow cycle (generally fallow every fourth
year). The nitrogen level in the soil can be augmented with the planting of
any legume or pod-bearer e.g. peas, beans, alfafa, lucerne etc. during the
fallow period. Leguminous plants, such as the above, process nitrogen from
the air and transfer it to their roots. In the case of peas, beans and other
food legumens the crop is harvested and the roots and stalks left to rot.
Non-harvestable legumes e.g.lucerne, gorse are ploughed in. In all cases the
nitrogen rich roots are left in the ground where they decay rapidly and
release their nutrients in time for the next year's crop.
Regards,
Bob.
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