Plasma nitriding of steels af Aghajani, Hossein, Behrangi, Sahand

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Morphological and anatomical responses of corn (Zea mays L. IPB var. 911) seedlings to lead nitrate af Yllano, Orlex Baylen 1973-

Land use and groundwater quality in the upper Agno watershed (Loo and Cayapas Valleys, Northern Benguet) af Pascua, Chelo Supnet

Progress in nitrogen cycling studies proceedings of the 8th Nitrogen Workshop, held at the University of Ghent, 5-8 September 1994

Biological nitrogen fixation in sustainable rice farming af Watanabe, Iwao

Ecological study of the Bontoc rice paddy system a case of human-environment interaction af Omengan, Elizabeth A., Sajise, Percy E.

Nitrogen and phosphorus cycles in a Bontoc rice paddy system af Omengan, Elizabeth A.

Nitrogen and rice

Nitrogen and rice

Nitrogen and rice