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Articles by Kevin I. Ugwuoke
Total Records ( 2 ) for Kevin I. Ugwuoke
  Christopher C. Onyeke , Godswill C. Ajuziogu , Simon C. Eze and Kevin I. Ugwuoke
  Screen house experiments were conducted to ascertain the effects of soil amendments with pig excrements/manure at different levels (0 (controls), 10, 20, 30, 40, 50 and 60 t ha–1) on the management of Meloidogyne javanica at different inoculum densities (0 (controls), 2,000 and 4,000 eggs) on the African yam bean. Soil amendment with pig manure significantly (p≤0.05) improved on the vegetative growth of African yam bean plants infected with eggs of M. javanica when compared with infected plants but without amendment. The amendment also significantly (p≤0.05) suppressed the formation of root galls and egg masses and consequently recorded lower gall and egg mass indices as against the controls. The effect of soil amendments with pig manure on the management of M. javanica on test plants increased with increase in amendment levels. It was also observed that the infectivity of M. javanica increased at a higher inoculums density (4,000 eggs). Generally, it can be concluded that incorporation of pig excrement/manure in African yam bean fields infested with M. javanica would lead to improved growth of plants and also suppress nematode population.
  Idorenyin A. Udo and Kevin I. Ugwuoke
  A glasshouse experiment was conducted to assess the pathogenicity of Meloidogyne incognita race 1 on turmeric (Curcuma longa L.) at three inoculum densities (0, 2500, 5000 eggs plant-1) and soil amendment with different levels of Poultry Manure (PM) (0, 10, 20, 30 and 40 t ha-1). The results obtained showed that root-galling and egg production decreased in a linear response to increasing PM level at both low and high inoculum densities (r = -0.88 and r = -0.85, respectively; p≤0.01). The lowest gall index and egg mass index of 2.0 were recorded in plants amended with 40 and 30 t ha-1 PM, respectively. The high nematode density was more pathogenic (p≤0.05) than the low density. Shoot length, fresh shoot and root weights responded in a curvilinear pattern with increasing levels of PM. In general, these growth variables increased with increase in PM level up to 20 t ha-1 and then declined with further increase. At high inoculum density, shoot growth was enhanced by 242 and 58% with 20 and 40 t ha-1 PM relative to unamended soil, respectively. Conversely, fresh root weight was increased by 120% and reduced by 12.8% with 20 and 40 t ha-1 PM, respectively. From this study, it could be inferred that higher levels of PM were highly nematicidal but phytotoxic to turmeric plants; the optimal rate of PM amendment is predicted to be 18-22 t ha-1. However, for this method to be incorporated into Integrated Nematode Management Programme of turmeric, field trials are needed for the optimization of the quantity, time and method of application.
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