http://repo.lib.sab.ac.lk:8080/xmlui/handle/123456789/655 2026-04-17T01:41:54Z http://repo.lib.sab.ac.lk:8080/xmlui/handle/123456789/988 GENE ACTION AND COMBINING ABILITY FOR GRAIN YIELD AND YIELD RELATED TRAITS IN RICE (Oryza sativa L.) Dorosti, H; Monajjem, S Line (five) × tester (two) analysis was conducted to determine good parents and the nature of gene action governing yield and its component traits in rice. The line × testers showed significant differences for all traits except for number of spikelets per panicle and hundred grain weight. Parents with low × high general combining ability (GCA) effects resulted in heterotic hybrid combination like the IR62829A/IR57301-158-1R. A low × low GCA gave the best heterotic combination i.e. IR68888A/’Sepidroud’. The study showed GCA to only identify better parental lots and it will be unwise to discard the low GCA types. Predominance of dominance gene action for all the traits studied except for flag leaf width and number of spikelets per panicle suggests heterosis breeding must be strongly pursued for exploitation of the yield advantage over the inbred varieties. 2014-09-01T00:00:00Z http://repo.lib.sab.ac.lk:8080/xmlui/handle/123456789/984 TECHNICAL EFFICIENCY DIFFERENTIALS IN OIL PALM PROCESSING TECHNOLOGIES IN CROSS RIVER STATE, NIGERIA Abdulsalam, Zakari; Asu, James; Ahmed, Ben This research analyzed technical efficiency differentials between traditional and improved oil palm processing technologies in Cross River State, Nigeria. A multistage sampling technique was used to select 164 processors. Data were collected through questionnaire and analysed using stochastic frontier. Results revealed mean efficiency of 62% for traditional and 81% for improved technologies. Implying that, no need for the development of a new technology; however, production can be improved using current available technologies. Labour, fresh fruit, depreciation cost and other variables costs were found to affect technical efficiency of traditional processors positively while labour, fresh fruit and other variables costs positively affect improved technologies users’ technical efficiency. Determinants of technical efficiency for both groups of processors were processing experience, educational level and access to extension contact. It was recommended that adoption of improved technologies for processing oil palm should be encouraged by government through extension service and credit facilities. 2014-09-01T00:00:00Z http://repo.lib.sab.ac.lk:8080/xmlui/handle/123456789/982 DETERMINANTS OF Irvingia SPECIES KERNEL (Ogbono) SUPPLY AND DEMAND IN DELTA STATE, NIGERIA Ojogho, O; Egware, R. A The study examined the determinants of Irvingia species (ogbono) in Aniocha North and South Local Government Areas of Delta State of Nigeria. Primary data were mainly used in the study. The data were collected using two sets of well-structured questionnaire containing items on the supply information for producer and demand information respectively on ogbono in the study area. A two-stage sampling technique was used to sample respondents in the area. A total of sixty (60) copies of the producer-set and one hundred and twenty (120) copies of the consumer-set of questionnaire respectively were valid for analysis for the study. Data collected were subjected to inferential statistics using multivariate analysis, involving correlation analysis, Principal Component Analysis (PGA), and the standardized beta-weight multiple regression analysis. The results showed that, among the determinants of the supply of ogbono in the study area, the initial supply price, mid-season supply price and the end-season price were statistically significant at 5% level of significance. Among the determinants of irvingia kernel (ogbono) demand, the initial demand price, mid-season demand price, end-of-season demand price, price of substitute commodity were statistically significant. Therefore, institutional framework that will guarantee stable price of ogbono will ultimately translate to improved economic base and sustained livelihoods of the people of Aniocha in Delta State, Nigeria. 2014-09-01T00:00:00Z http://repo.lib.sab.ac.lk:8080/xmlui/handle/123456789/978 GENETIC CONTROL OF YIELD AND YIELD RELATED TRAITS IN SELECTED UPLAND COTTON VARIETIES OF PAKISTAN Shah, Syed Awais Sajid; Akhtar, Lal Hussain; Minhas, Rashid; Shahjahan Bukhari, Muhammad; Shah, Syed Sajid Masood; Azhar, Faqir Muhammad Inheritance pattern of some polygenic characters were studied in 5 x 5 F1 diallel hybrids and their parents of upland cotton. 20 F1 hybrids and their parents were grown in field under randomized complete block design at experimental area of the Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad. Diallel analysis was used to determine the mode of gene action and genetic components for various yield related traits like plant height, monopodial branches plant-1, sympodial branches plant-1, bolls plant-1, boll weight and seed cotton yield plant-1. Results of regression coefficients showed that all the characters were fit for genetic analysis. Additive type of gene action with partial dominance and over dominance were involved for the expression of the traits studied. Results suggested that these characters can be improved through appropriate selection method or by hybrid development. 2014-09-01T00:00:00Z