International Research Symposium on Pure and Applied Sciences (IRSPAS)

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Author: search.filters.author.Karunarathna, B.

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    Effect of banana, orange and pomegranate peels on okra (Abelmoschus esculentus) yield
    (4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019) Dayarathna, S.G.A.R.M.; Karunarathna, B.
    Fruit peel waste is one type of agro wastes accumulated in large quantity every day. The discarded fruit peels contain a diverse range of nutrients and antimicrobial compounds, which can be utilized in agriculture. Okra has a high demand in Sri Lanka due to its medicinal and nutritional values, and it grows well in moderate to high temperature. Low yield resulting from poor nutrient status of the soil has been identified as one of the major factors limiting okra production. An experiment was conducted to determine the effect of application of selected fruit peels on okra yield using the variety Haritha. Six treatments were laid out in a Completely Randomized Design. Treatments were recommended inorganic fertilizer (T1), half dose of recommended inorganic fertilizer with 1g of banana (T2), pomegranate (T3) and orange (T4) peel powder, 0.5g each of banana and pomegranate peel powders (T5) and 0.5g each of orange and banana peel powders (T6) at both basal and topdressing times. At each picking length, girth and fresh weight of the fruits were measured. The results revealed that there was positive significant differences (P<0.05) on okra fruit length, girth and fresh weight at pickings. Yield (tons/ha) from okra in T6 was three times higher than the yield from okra in T1. The present study concluded that the application of fruit peel powder to the soil, improves the yield of okra in sandy regosol compared to recommended inorganic fertilizer and 0.5g each of orange and banana peel powders with half dose of recommended inorganic fertilizer at both basal and topdressing times gave higher yield among them.
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    Does okra (Abelmoschus esculentus L.) - cowpea (Vigna unguiculata L. Walp.) intercropping planting system affect okra yield?
    (4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019) Maduwanthi, A. K. M. R. B.; Karunarathna, B.
    Due to the depletion of land with the urbanization, as well as due to the lower levels of nutrients in soil, crop production has gone down. Okra production also has severely affected as a consequence of these problems. An experiment was conducted at Crop Farm of Eastern University, Sri Lanka to study the impact of planting patterns on okra yield. The experiment was laid out in Randomized Complete Block Design. Treatments were okra as monocrop (90 x 60 cm) (T1), alternative planting of okra and cowpea (T2), 60/150 cm and 75/120 cm paired row planting of okra with two rows (T3 and T5) and three rows of cowpea in between paired rows of okra (T4 and T6). Okra variety Haritha and cowpea variety Waruni were used in the experiment. Parameters were taken at weekly intervals up to three pickings. Parameters such as days for 50% and 100% flowering, number of fruits per plant at 2nd picking and fresh weight per fruit in okra showed higher values in T4. Fruit length and dry weight per fruit was not affected with the different planting patterns at each picking. Seeds per fruit of okra in the 1st picking of T4 was higher than the other tested treatments. Yield from okra in T4 was 1.5 times higher than the yield from okra in T1 (control). The present study concluded that 60/150 cm paired row of okra and three rows of cowpea between paired rows of okra would be the most suitable planting pattern in sandy regosol. That particular planting pattern would give comparatively higher yield than the other tested treatments
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    Impact of combine use of banana pseudostem sap with inorganic fertilizer on root development, nodulation and dry matter accumulation of cowpea (Vigna unguiculata) in sandy regosol
    (4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019) Fernando, W. S. L. V.; Karunarathna, B.
    This study was aimed to evaluate the impact of foliar spray of nutrient enriched organic fertilizer with inorganic fertilizer on root development, nodulation and dry matter distribution of cowpea in sandy regosol at Crop Farm, Eastern University, Sri Lanka. An experiment was laid out in a Randomized Complete Block Design having five treatments replicated four times. Cowpea variety Waruni was used for this study. Treatments were recommended as inorganic fertilizer and different concentration of nutrients enriched sap such as 1%, 3%, 5% and 7% which were prepared by using banana (Musa acuminate L.) pseudostem and sprayed with urea, TSP and ½ MOP as basal and recommended topdressing. Data were collected by destructive sampling method. The results revealed that application of banana pseudostem had significant positive impact (P<0.05) on root length, dry weight of leaves, stem and roots at 4th, 6th and 10th week after planting and sun-dried seed weight of 100 seeds at 1st, 2nd and 3rd picking compared with recommended fertilizer. Number of nodules was not varied immediate after first application. However, a significant difference (P<0.05) was shown after 2nd dose. Present study suggested that among the tested treatments 1% banana pseudostem sap at 3rd, 5th, 7th and 9th week after planting with urea, TSP and ½ MOP as basal and recommended topdressing would be the most suitable combination to enhance root development, nodulation and dry matter accumulation of cowpea in sandy regosol.