Browsing by Author "Olapade, E.O."

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    Hand pollination of Hevea brasiliensis in Nigeria (1984-1990). comparison with open pollinated field data
    (Rubber Research Institute. Agalawatta, 1990) Olapade, E.O.; Omkhafe, K.O.
    Artificial hand polinations of Hevea brasiliensis were done at the Rubber Research Institute of Nigeria (RRIN) from 1984-1990: these involved 28,887 female flowers from which only 7.60perc. mean fruit set was obtained while only 5.13perc. of the flowers formed fruits that reached maturity. A correlation value of 0.65 was obtained between number of female flowers pollinated and fruits set. Clonal variations were observed for flowers production in the open pollinated field with very high correlation of +0.9 between male and female flowers. Clones PB 5/51 and RRIM 707 produced the highest number of both male and female flowers. The mean male to female flower ratio was 14.1. Male flowers had a higher correlation coeffieciency of r=0.32 with fruit set than emale flowers with r=0.05. An estimate of 15perc. fruit set was obtained under natural open field pollinations in 1989 while only 8.8perc. of the flowers formed fruits that reached maturity. Only about 64perc. of the 64 perc. of the fruits set under both artificial and natural open pollinations reached maturity. While about 36perc. abortions of fruits took place. The implications of these results are discussed.
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    Secondary characters and their association with latex yield in Hevea brasiliensis(Mull Arg.)
    (Rubber Research Institute. Agalawatta, 1988) Olapade, E.O.
    Ten Hevea clones developed at the Rubber Research Institute Of Nigeria (RRIN) and a control clone RRIM 600 were evaluated for their latex yield after six months of tapping. The mean dry latex yield recorded for each clone was correlated with their Juvenile secondary characters i. e Height, Girth and Plant Vigour at 18 months. Significant variability was exhibited by the clones in terms of yield with clone C 83 having the highest mean latex yield of 42.15 g/t/t/ while clone C 202 had the least mean yield of 22.73 g/t/t. The secondary characters i. e Hewight, Girth and Vigour were significantly positively correlated to themselves but all negatively correlasted to latex yield. However a spurious correlation was established between latex yield and the secondary characters. The implication of the results are discussed