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University of Nairobi (1994)

Effects of Desmodium uncinatum on soil nitrogen and herbage yield of Chloris roxburghiana in Kibwezi area

Macharia, Peter Ng’ang’a

Titre : Effects of Desmodium uncinatum on soil nitrogen and herbage yield of Chloris roxburghiana in Kibwezi area.

Auteur : Macharia, Peter Ng’ang’a

Université de soutenance  : University of Nairobi, Kenya

Grade : MSc 1994

Résumé
The effect of Desmodium uncinatum on.Chloris roxburghiana in Kibwezi area was studied at the University of Nairobi Dryland Field station. The station falls under the agro-ecological zone V. The study was conducted under both field and greenhouse conditions during two seasons in 1991/92. The main objective of the study was to assess the interactions between the two species in increasing primary productivity of rangelands to facilitate livestock production. Treatments consisted of growing Desmodium alone, Chloris alone, Desmodium/Chloris mixture and a control. The effect of treatments in greenhouse pots indicated significant (P 0.05) differences with legume treatment having more total N. In field plots, significant differences occurred only in watered plots. These plots had more total N (albeit non-significant) than the unwatered plots. The topsoil (0-15 cm) had more (P 0.05)total N than the subsoil (15-30 cm). The treatments had non-significant (P=0.05) results on the available P concentration in the greenhouse. The effect of seasons showed significant (P 0.05) differences in the greenhouse with a decrease at the end of season 2. In field plots, significant (P 0.05) effect of treatments and depth occurred only in watered plots. The effect of watering showed significant differences at the end of season 2 in the topsoil. There was arise of P concentration at the end of season 1 and a decrease of P at the end of season 2 in both watered and unwatered plots at both depths. The OM, CP and P content in the greenhouse study, the effects of treatments and stage of growth showed significant (PSO.05) results on OM production and CP content in both seasons. The field experiment indicated that D. uncinatum increased OM production of c.roxburghiana during the first season (short rains season). The CP and P content of Chloris grown in mixture was more (PSO.05) than that of the grass grown in monoculture. The effect of watering increased the P content of both the legume and grass plants. Both greenhouse and field studies showed that there was a decrease of CP and P content of both legume and grass as the plants approached maturity. The results indicated that the herbage quality and quantity of c. roxburghiana can be enhanced by growing it in mixture with D. uncinatum under the semi-arid environment of Kibwezi area. Desmodium will also enhance soil fertility levels. These qualities can have a positive effect on the cattle, goats and sheep that graze in that area.

Mots clés : Soils / Desmodium uncinatum / Chloris roxburghiana / Kibwezi, Kenya / Nitrogen

Présentation (Research Kenya)

Page publiée le 22 septembre 2010, mise à jour le 13 mars 2018