The Reaction of Cowpea (Vigna Unguiculata) To Alectra Vogelii (Benth) Parasitism, As Influenced By Nitrogen and Phosphorus Fertilization at Kiboko, Kenya PDF Print E-mail
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Wednesday, 03 August 2011 04:57

Karanja J1*., S.N. Nguluu1 and M. Gatheru1

1 Kenya Agricultural Research Institute, Katumani

*Corresponding author: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


A field study was conducted in 2011 at KARI-Kiboko (370 43’N and 2013 ‘E). The objective was to assess the efficacy of Nitrogen and phosphorus fertilizers in reducing the effect of Alectra vogelii parasitism on cowpea (Vigna unguiculata). Three cowpea genotypes (Kir/Nya-005, M66 and K80) were tested using three Nitrogen levels (0, 25, and 50 Kg Nha-1) and three phosphorus levels (0, 20 and 40 Kg P ha-1). Mean performance over the season showed that application of nitrogen and Phosphorus fertilizer separately did not reduce the Alectra count during the growth period of cowpea. Combination of nitrogen at the rate of 25 kg N ha-1 and phosphorus applied at 40 kg P ha-1 slightly increased the cowpea yield. Application of 20 kg P ha-1 and 25 Kg N ha-1 increased crop vigour in the three cowpea varieties. Also combination of 25 kg N ha-1 and 40 kg P ha-1 fertilization enhanced crop vigour and reduced crop injury among the genotypes.

Key word: Alectra vogelii, Nitrogen, Phosphorus, Cowpea

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