http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/5702 2026-04-08T16:15:39Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1583 Title: Impact of Different Depths of Transplanting by Machine Transplanter on Growth and Yield Performance of Rice Variety (Bw 361) Authors: Sivaneson, S.; Vijayakumari, V. Abstract: Depth of transplanting is an important factor which influences the grain yield in rice production systems by determining the number of tillers. Field trial was conducted to evaluate the growth and yield response of different planting depths of seedlings of mechanical transplanted rice. Four rows of behind-walk type paddy KUBOTA (SPW 48c) transplanter was used with 30 cm row spacing and five different planting depth (0.7, 1.4, 2.1, 2.8 and 3.7 cm), and replicated four times. The growth parameters of plant height, number of tillers, root length and yield parameters of panicle per hill, panicle length, and grain yield were recorded. Plant height (cm) during vegetative period, was significantly (p<0.05) higher at shallow planting depth of 0.7 cm. Root length and panicle length were not significantly influenced by depth of planting. The number of tillers per hill was significantly (p<0.05) differed among depth of planting. A positive correlation was observed between depth and tillers per hill up to 2.1 cm depth. The maximum number of tillers per hill and panicle numbers per hill were recorded at the depth of 2.1 cm. Results revealed that the planting depth of 2.1 cm produces significantly higher tillers, panicles per hill and grain yield. Therefore, 2.1 cm planting depth is more appropriate for cultivation of Bw361 variety in machine transplanting system in low country dry zone of Sri Lanka. 2019-01-01T00:00:00Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1582 Title: Effect of Azolla filiculoides Application on Weed Population in Paddy Fields Authors: Sivaneson, S.; Ponnegippenthiraraja, A. Abstract: The integrated use of organic and inorganic fertilizers is desirable to sustain paddy cultivation. Study was conducted at Rice Research Station, Paranthan, Sri Lanka to develop effective weed control method to gain economic return from irrigated paddy fields in the Dry Zone. The experiment was carried out during the period of November-February, 2017 (Maha), using randomized complete design with six treatments with three replicates; Azolla only, Azolla with three nitrogen levels (25%, 50%, 100% kg N/ha) of the recommended level of nitrogen, only recommended level of nitrogen (100 kg N/ha) and plot with absence of chemical fertilizer and Azolla (control). The nutrients potassium and phosphorus were applied to respective plots based on the recommended level. Results showed partial suppression of weed growth by Azolla filiculoides even under full plot area coverage. The range of weed suppression at rice 30 days after planting was 64.21 – 88.31%. However, Azolla failed to suppress the growth of some weeds such as Aeschynomene indica, Ipomoea aquatic and Cyperus iria. Plots with combined application of Azolla and different levels of nitrogen fertilizer revealed greater value for weed control efficiency the range of 76.81 – 80.93%. There was no significant difference in the yield in plots treated with Azolla + recommended level of N fertilizer, Azolla + 50 kg/ha recommended level of N fertilizer (6066 and 5966 kg/ha respectively) and only recommended level of N fertilizer without Azolla (5533 kg/ha). Therefore the use of Azolla in the rice cultivation has greater influence on suppressing the weeds and also reduces the nitrogen fertilizer and herbicides application requirements. 2019-01-01T00:00:00Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1581 Title: Effect of Different Time of Earthing up on Growth and Yield Performances of Groundnut (Arachis hypogea L.) Varieties Authors: Thilini, S.; Pradheeban, L.; Nishanthan, K. Abstract: An experiment was conducted to assess the effect of different time of earthing up on growth and yield performances of groundnut (Arachis hypogea L.) varieties at the Faculty of Agriculture, Kilinochchi during the period of February to July 2018. Two factor factorial experiment was conducted in Randomized Complete Block Design (RCBD) with four replicates. Different dates of earthing up such as 23 days after (T1), 30 days after (T2) and 37 days after (T3) planting and five groundnut varieties; Lanka jumbo (V1), Tissa (V2), Tikiri (V3), Indi (V4), and ANK G1 (V5) were used as factors. The groundnut varieties were planted at the spacing of 45 cm × 15 cm and all other agronomic practices were done according to the recommendation of Department of Agriculture. The growth and yield parameters were recorded and shelling percentage was calculated. ANOVA and Duncan’s Multiple Range Test (DMRT) were performed to find out the significant differences among the treatment combinations. Growth parameters of groundnut varieties such as plant height, number of leaves and branches were not significantly differed among the varieties with duration of earthing up. The yield parameters such as fresh and dry pods weight per plant, 100 pods and seed weight and mature pods per plant were significantly differed among the duration of earthing up and also among the varieties and the highest records in T3 treatment in all varieties. There was no interaction effect among earthing up period and varieties. The highest shelling percentage of 84 % was observed in groundnut variety Lanka jumbo under the T3. The highest yield was obtained from T3 treatment in each variety and among the varieties; Lanka jumbo gave the highest yield. It can be concluded that 37 days after earthing up and Lanka jumbo can be selected as suitable treatment combination to obtain the highest yield from groundnut in Kilinochchi District. 2019-01-01T00:00:00Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1580 Title: Promising lines of Eggplant (Solanum melongena) Developed through Population improvement of locally popular cultivar –Plastic Authors: Arasakesary, S. J.; Amirthalojanan, A.; Gugapriya, R.; Yogeswaran, T. Abstract: Recurrent selection is an important breeding method employed to improve the populations of crop plants particularly those of cross-pollinated species. Brinjal (Solanum melongenum L.) is one major cross-pollinated crop which most important vegetables of the world and a huge prospect in Sri Lanka. Several brinjal landraces are being cultivated in Sri Lanka even though few brinjal varieties have been released by Department of Agriculture. A local brinjal cultivar, so-called ‘Plastic’, is also one of the popular cultivars being cultivated by farmers in the northern region, especially in Vanni area of Sri Lanka. This cultivar does not have a pure population in the farmer’s field and the farmers received the seed materials from unreliable sources. Regional Agriculture Research and Development Centre (RARDC), Kilinochchi has initiated a purification program of the plastic cultivar since the year of 2016. Randomized complete block design (RCBD) was used with five replicates. Recurrent selection and restricted open-pollination methods have been continued for five consecutive seasons with five lines to get a purified high-yielding brinjal cultivar. Originally developed five lines were advanced for three seasons and one line (number 5) was dropped out from the third season owing to its low yielding performance. While improving the population, yield evaluation was also made. Yield evaluation conducted in the fourth and the fifth seasons with the selected lines that indicated significant difference in their yield performances among these lines. Finally, two high performing uniform lines (Line number 02 and 03) with the yield more than 22 t/ha were generated. These two lines could be promoted as promising variety/s after conducting multi-locations trials. 2019-01-01T00:00:00Z