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The effect of four levels of nitrogen and time of harvest on the yield of sweet potato (Ipomoea batatas (L.) Lam) : a thesis submitted in partial fulfilment of the requirement for the Post Graduate Diploma in Agriculture /
I tiakina i:
| Kaituhi matua: | |
|---|---|
| Hōputu: | Pukapuka |
| Reo: | Ingarihi |
| I whakaputaina: |
Lae :
PNG University of Technology, Dept. of Agriculture,
1989.
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| Ngā marau: | |
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