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Effects of ley farming on the nitrogen status of some infertile upland soils from North Eastern Thailand : a report submitted for AG 850 Research Project in partial fulfilment for the requirements of the degree of Master of Agriculture studies in the University of Queensland /
I tiakina i:
| Kaituhi matua: | |
|---|---|
| Hōputu: | Thesis |
| Reo: | Ingarihi |
| I whakaputaina: |
[Brisbane :
University of Queensland],
1988.
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| Ngā marau: | |
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