Relationship Between Measured and Calculated Yield of Cassava and Yam Under Peasant Farm Management System in Soils of Ibadan, Nigeria
Abstract
The relationship between measured and calculated yield of yam and cassava under peasant farm management in the soils of Ibadan area was investigated. Precambrian basement complex rocks underlie the area. A site heavily cultivated by peasant farmers and sufficiently represents the geology, soils, vegetation and land use pattern of Ibadan was selected for the study. Forty-five plots under cassava and yam cultivation were selected to cover the twelve series in the area. The soils have texture ranging from loamy sand t sandy clay with weak crumb and granular structure in the surface layer. The highly concretionary and gravelly surface layers of Gambari and low soil series constitute a problem for the tillage implements. The soils classified as Alfisols, Entisols and Inceptisols have high fertility indices 42.84 to 81.99 and very low to high productivity indices 3.77 to 60.91. Soil productivity was limited mainly by soil depth, drainage and surface stoniness. Crop yields were predicted from the relationship between the yield to productivity index using the measure yield value of one of the soils. Measured cassava yield fro 6.3 to 11.5t/ha. While calculated yield range from 2.69 to 11.5t/ha. Measured yam yield range from 1.2 to 5.Ot/ha while calculated yield range from 2.85 to 6.4 t/ha. Peasant farmers have been able to cultivate these soils by tilling with hoes machetes and making heaps for yams and cassava. Results indicate positive correlation between measured and cultivated yield r =0.81 for yam and 0.77 for cassava with good predictive values of Y =2.51 + 0.71X and Y = 1.36 + 0.74X for yam and cassava respectively. Chi-squared analysis showed the independence between measured and calculated yield.[Niger Agric. J. 33 (2002): 109-118]
NAJ supports free online communication and exchange of knowledge as the most effective way of ensuring that the fruits of research and development practice are made widely available. It is therefore committed to open access, which, for authors, enables the widest possible dissemination of their findings and, for readers, increases their ability to discover pertinent information. The Journal adopts and uses the CC: BY license and is open access. This license lets others distribute, remix, adapt, and build upon your work, even commercially, as long as they credit you for the original creation. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the Journal’s published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work. Copyright for articles published in this Journal is retained by the Journal.
