The effects of sources, placements, timing of nitrogen application and placements of phosphorus fertilizer on the nitrogen uptake, growth and yield of rice variety BPI 76 and on levels of mineral nitrogen on Maahas clay [microform]
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| Định dạng: | Visual Material |
| Được phát hành: |
Quezon City
Photoduplication Service. University of the Philippines Library
1977.
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