Estimation of nitric and nitrous nitrogen in soils /

Role of blue-green algae in nitrogen economy of Indian agriculture /
by: Singh, Rama Nagina (Botanist), 1915-
Published: (1961)

Nitrogen fixation in tropical cropping systems /
by: Giller, Ken E. (Ken Everleigh)
Published: (1991)

Soil-plant-nitrogen relationships /
Published: (1978)

The production of active nitrogen in the soil /
by: Fraps, G. S. (George Stronach), 1876-
Published: (1908)

Methods for evaluating nitrogen fixation by nodulated legumes in the field /
Published: (1989)

Relation of the total nitrogen of the soil to its needs as shown in pot experiments /
by: Fraps, G. S. (George Stronach), 1876-
Published: (1912)

Grassland nitrogen /
by: Whitehead, D. C. (David Charles)
Published: (1995)

Nitrogen sources and cycling in natural waters /
by: Brezonik, Patrick L.
Published: (1973)

Nitrogen management in farming systems in humid and subhumid tropics /
Published: (1985)

Soil nitrogen /
by: Bartholomew, W. V. (William Victor), 1908-2004
Published: (1965)

Soil nitrogen
by: Bartholomew, W. V. (William Victor), 1908-2004
Published: (1965)

Biological nitrogen fixation /
Published: (2015)

Nitrogen fixation in crop production /
Published: (2009)

Mineral nitrogen in the plant-soil system /
by: Haynes, R. J.
Published: (1986)

Nitrogen in agricultural soils /
Published: (1982)

Nitrogen in agricultural soils /
Published: (1982)

The nitrogen cycle in lakes at Kitoi Bay, Afognak Island, Alaska.
Published: (1966)

Biological nitrogen fixation, sustainable agriculture and the environment : proceedings of the 14th International Nitrogen Fixation Congress /
Published: (2005)

Occurrence of nitrites in soils /
by: Fraps, G. S. (George Stronach), 1876-
Published: (1930)

Nitrogen fixation : fundamentals and applications : proceedings of the 10th International Congress on Nitrogen Fixation, St. Petersburg, Russia, May 28-June 3, 1995 /
Published: (1995)

Nitrogen fixation at the millennium /
Published: (2002)

Soil-plant-nitrogen relationships /
Published: (1978)

Nitrogen in Soils of China /
by: Zhu, Zhao-liang
Published: (1997)

Managing nitrogen in crop production /
by: Scharf, Peter C. (Peter Clifton), 1959-
Published: (2015)

The nitrogen fixation and its research in China /
Published: (1992)

Immobilization and mineralization of nitrogen in pasture soil /
by: Huntjens, J. L. M.
Published: (1972)

Effects of tillage and nitrogen fertilization on nitrogen losses from soils used for corn production /
Published: (1990)

Biological nitrogen fixation in flooded rice fields /
by: Lowendorf, Henry S.
Published: (1982)

Nitrogen in soils of China /
Published: (1997)

Nitrogen in organic wastes applied to soils /
Published: (1989)

Nitrogen in agricultural systems /
Published: (2008)

Mineral nitrogen in the plant-soil system /
by: Haynes, R. J.
Published: (1986)

Soil and fertilizer nitrogen : review study with particular reference to plant nutrition and environmental protection /
Published: (1984)

Dynamics of the nitrogen cycle in lakes.
Published: (1970)

Nitrogen fixation in crop production /
Published: (2009)

Evaluation of nitrogen application technique and tillage system on nitrogen runoff from an erodible soil /
by: Lembi, Carole A.
Published: (1985)