Microbiological transformations of nitrogen in flooded maahas clay [microform] by Manguiat, Ireneo Javier 1945-

Distribution of the forms of nitrogen in some Philippine soils [microform] by Caramancion, Maria Nylda Villena 1945-

In situ determination of biological nitrogen fixation by blue-green algae in lowland rice fields [microform]. by Alimagno, Bonifacio Villanueva 1947-

Microbiological transformations of nitrogen in flooded maahas clay by Manguiat, Ireneo Javier 1945-

Electronic device analyzes soil nitrogen. IN Agriculture News.

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Distribution of the forms of nitrigen in some Philippines soils by Caramancion, Maria Nylda (Villena) 1945-

Evaluation of nitrogen test methods for soils planted to sugarcane by Lojo, Angelina M. 1937-

Evaluation of nitrogen and phosphorus soil tests for upland soils of Bukidnon by Cagmat, Rebecca Benoza 1948-

In situ determination of biological nitrogen fixation by blue-green algae in lowland rice fields by Alimagno, Bonifacio Villanueva 1947-

The effect of tillage method and nitrogen rate on some soil properties and corn response by Riyanto 1938-