عناصر مشابهة

• Use of azolla as a biofertilizer to reduce the dependance on the chemical fertilizers\\ 
  بواسطة: Nour El Din, Mohamed El Sayed Mahmoud منشور: (1997)
• The ecological effect of heavy application of phosphate fertilizers in some egyption soils\\ 
  بواسطة: El Dewiny, Camilia Youssef .  منشور: (1992)
• Effect of chemical control of some horticultural crops pests on usful soil mites in ismilia governorate\\ 
  بواسطة: El Alfy, Esmat Awadin منشور: (1999)
• The effect of chemical pest control on diazotrophs in the phllosphere of treated plants\\ 
  بواسطة: Mohamed, Faten Mohy El-deen منشور: (1997)
• Effect of some formulated plant extracts on snails control of schistosomcisis and study their biological effects\\ 
  بواسطة: El Behary, Mohsen Hamid Hassan  منشور: (2005)