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Studies on the availability of azolla N and urea N for rice growth using {sup}1{sup}5N
- Published in:
- Plant & Soil, 1990, v. 128, n. 2, p. 209
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- Publication type:
- Article
The relative roles of N fixation, fertilizer, crop residues and soilin supplying N in multiple cropping systems in a humid, tropical upland cropping system
- Published in:
- Plant & Soil, 1990, v. 121, n. 1, p. 73
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- Publication type:
- Article