Abido, Youssef Mohammed Youssef. <br/><br/>
Estimation of nitrogen fixation by legumes using isotopie nitrogen techniques  [microform] / 
 تقدير الأزوت المثبت بواسطة النباتات البقولية بإستخدام نظير الأزوت ن 15 
Youssef Mohammed Youssef Abido. 
 -  1989. 
 - 145, 4 leaves :  ill. ;  30 cm. 
<br/><br/>Thesis (Ph.D.) -- Al-Azhar University, 1989. 
<br/><br/>Includes bibliographical references (leaves 119-137) 
<br/><br/><br/>Microfiche. <br/>Cairo, Egypt : <br/>ASUNET, <br/>3 microfiche : negative. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen--Fixation.<br/>Nitrogen-fixing plants.<br/>Legumes.<br/>Nitrogen fertilizers.