JC Okonkwo's scientific contributions

Publications (4)

Article
Forty eight potato genotypes were evaluated in Saminaka (Lat. 100 27’N and Long 40E, Mean Min. Temp 25oC, Mean Max Temp 31.5oC) during the rainy season of 1999 and 2000 to determine the inter-relationship between yield and some important agronomic traits in the potato grown under high ambient temperatures. The genotypes were laid out in a randomize...
Article
Studies were carried out in 1997 and 1998 at Kuru, Jos Plateau, Nigeria to assess six storage methods for the storage of seed potato. The methods were: Storage in jute bags, perforated polythene bags, baskets, racks, crates and floor. Potato varieties used were Nicola (medium to long dormancy) and B7716-2 (short dormancy). The seed tubers were stor...

Citations

... The ranges of values for the majority of the characters evaluated were large, and the mean differences observed were significant. This is consistent with the findings of other studies (Sidhu and Pandita, 1979;Birhman and Kaul, 1989;Amadi et al., 2008) who found variances in potato varieties for numerous qualities. These changes in plant attribute within a population imply that selection for each trait is conceivable (Bonierbale et al.,2020). ...
... Kenya, 92% of the farmers store seed potato at the farm level as farm saved seed (Kaguongo et al., 2008). Most methods of storage used by farmers do not provide the optimal conditions for sprouting and there is high disease transmission and seed quality loss during storage (Okwonko and Amadi, 2004;Hirpa et al., 2010). Most farmers use mixed stores without separation of ware from seed potato and also with other crop produce (Hirpa et al., 2010). ...
... Potatoes are a major crop in Egypt and contribute immensely to human nutrition and food security (Karim, et al., 2010). The weather conditions during growing seasons and farm management are considered one of the most important constrains on the ability to increase production (Amadi, et al., 2009). There are three major cultivation seasons for potato in Egypt; Summer season cultivated during December and January, Nili season cultivated during late September and early October and winter season cultivated during late October and early November. ...