Acknowledgements
This work was supported by the Bill and Melinda Gates foundation
through the Tropical Soil Biology Institute of CIAT (CIAT-TSBF)
project on commercial microbial products. We thank Dr. Lusike of
the Kenya Agricultural Research Institute (KARI) for allowing us to
conduct the field experiments at the KARI field stations. We greatly
appreciate the assistance of Edwin Mutegi, Jotham Mwiti and Paul
Omolo for field technical assistance.