A preliminary weed survey of citrus orchard and nursery was conducted in National Horticultural Research Institute (NIHORT) Ibadan in the wet season of 2009. The result showed that out of 54 weed species encountered during the survey 39 were broadleaf weeds, 13 were grasses and two were sedges. The main citrus orchard recorded 55% of the total weed species while the citrus organic orchard recorded the least (27.8%). Seven different weed species were propenderant with high Relative Frequencies covering over 5% of the total weed species in three locations (citrus organic orchard, citrus/vegetable intercrop plot and juvenile citrus plot). Out of these, 3 weed species: Ageratum conyzoides L, Imperata cylindrica L. Raeuschel and Tridax procumbens L. had the greatest Relative Frequency of 12% each, in citrus organic orchard. However, the rest sampled areas have between 4 and 6 weed species accounting for 5% or more showing the whole survey area to be very rich in flora. Tridax procumbens L. and Chromolaena odorata (L) R.M Kings and Robinson associated with all the citrus based cropping systems in all the locations. Relative density of Euphorbia heterophylla L (35.95%) in juvenile citrus orchard was higher than any other species in all the locations. Panicum maximum had the highest Relative Density (18.8%) in citrus main orchard among the grass weed species next to Imperata cylindrica L. Raeuschel (25.09%) in citrus organic orchard indicating a higher infestation of citrus orchard than other species.
Fruit Characteristics (pod length, number of pod per bunch, pulp and seed weight, pulp weight and pod breadth), Seed Characteristics (number of seed per bunch, expected seed number per pod and seed weight per bunch), and Qualitative Characteristics of seeds (seed colour, shape, size and texture) of Parkia biglobosa (Jacq) G. Don population were investigated in this study. Twenty six (26) P. biglobosa population were sampled at the permanent site of the University of Ilorin, Nigeria, in May 2010 and fruits were collected from these populations for study. Pulp and seeds were removed manually from the dry brown indehiscent pods by using hand to break the pods along their sutures and de-pulping was done by manual washing with hands in water. There were significant differences (at P=0.05) among the fruit and seed characteristics of 26 populations of P. biglobosa investigated. Five (5) plants showed high pod number per bunch with 20 pods and above while long pod lengths were observed in seventeen (17) plants. Two (2) plants have narrow pointed tip pods (apex) and four (4) plants with broad pod breadth. One (1) plant has its apex size similar to its base (1.53cm). Seventeen (17) plants were observed to have more than 100seeds per bunch while, only one plant was noticed to exhibit wrinkled seed coat, the fifteen (15) plants had flat oval seeds. Two (2) plants had pure black seed coat and twenty four (24) had brownish seed coat colours. Larger percent of the plants have medium seed size, five (5) plants have small seed size and others are of big size.
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