Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Reseeding denuded pastoral land in Kenya.

Abstract

In this pamphlet, based on both published and unpublished data, 34 grass species recommended for reseeding denuded land in arid and semi-arid areas are described (11 are illustrated), with reference to their natural habitats and the areas where they can be used. Their rainfall and soil requirements and seed characteristics are given in tabular form. Seed weights of these grasses range from 45 thousand to 18 million per lb and rates for sowing 100 seeds/yd2 vary accordingly from 10 lb to 0.5 oz/ac; these are regarded as minimum rates for practical reseeding and with them it is expected that 10 plants/yd2 may survive. The technique of grass establishment is described and this includes mechanical bush clearing, seedbed preparation, sowing, protection of the seed after sowing and the subsequent management of reseeded land. The more important species which have already shown promise in tests include Cenchrus ciliaris, Chlorisgayana, C. roxburghiana, Cynodon dactylon, a perennial species of Dactyloctenium, Enteropogon macrostachyus, Eragrostis sp. (near curvula) and E. superba, all of local origin. These and other species which were also tested varied in their response to certain treatments: Eragrostis sp. (near curvula) responded well to seed pelleting, Chloris gayana to protection of the seed with cut branches, Cenchrus ciliaris to good seedbed preparation, etc. An appendix shows where commercial seed and machinery suitable for use in re-seeding operations can be obtained. Seed of Chloris gayana, Panicum coloratum, P. maximum and Cenchrus ciliaris can be obtained commercially; for other grasses the areas are indicated where their seeds can be collected on a reasonable scale from natural stands. -A.V.B.