H. M. Helal

Mobilization and turnover of soil phosphorus in the rhizosphere

H. M. Helal, A. Dressler, H. Helal, 1989 .

Varietal differences in root phosphatase activity as related to the utilization of organic phosphates

H. M. Helal, H. Helal, 1990, Plant and Soil.

Carbon Turnover in the Rhizosphere

D. Sauerbeck, H. M. Helal, H. Helal, 1989 .

Effect of plant roots on carbon metabolism of soil microbial biomass

D. Sauerbeck, H. M. Helal, H. Helal, 1986 .

Soil and Root Phosphatase Activity and the Utilization of Inositol Phosphates as Dependent on Phosphorus Supply

D. Sauerbeck, H. M. Helal, H. Helal, 1991 .