Dry matter yields and hydrological properties of three perennial grasses of a semi-arid environment in east Africa

Abstract

Enteropogon macrostachyus (Bush rye) , Cenchrus ciliaris L. (African foxtail grass) and Eragrostis superba Peyr (Maasai love grass) are important perennial r angeland grasses in Kenya. They provide an important source of forage for domestic livestock a nd wild ungulates. These grasses have been used extensively to rehabilitate denuded patches in semi -arid environment of Kenya. This study investigated the dry matter yields and hydrological properties o f the three grasses under simulated rainfall at thr ee phenological stages; early growth, elongation and r eproduction. Laboratory seed viability tests were also done. Hydrological properties of the three gra sses were estimated using a Kamphorst rainfall simulator. Results showed that there was a signific ant difference (p > 0.05) in dry matter yields and soil hydrological properties at the different grass phen ological stages. Generally, all the three grasses improved the soil hydrological properties with an i ncrease in grass stubble height. C. ciliaris gave the best soil hydrological properties followed by E. macrostachyus and E. superba , respectively. E. macrostachyus recorded the highest seed viability percentage. C. ciliaris and E. superba were ranked second and third, respectively. C. ciliaris yielded the highest biomass production at the repro ductive stage followed by E. superba and E. macrostachyus , respectively.