TY  - BOOK
AU  - Mostafa,Mahmoud Helmy
TI  - Effect of certain salts on the activity of azotobacter 
PY  - 1976///
KW  - azotobacter
KW  - Nitrogen
KW  - Fixation
KW  - Soils
KW  - Nitrogen content
N1  - Thesis (M.S.)-- Al-Azhar University, 1976; Includes bibliographical references (leaves 87-103); Microfiche; ASUNET; Ain Shams University; 2 microfiches : negative
ER  -