4LBZ-100型水稻收割機的減振設(shè)計,4LBZ-100型水稻收割機的減振設(shè)計,lbz,水稻,收割機,設(shè)計 寧波大紅鷹學(xué)院畢業(yè)設(shè)計（論文）任務(wù)書 所在學(xué)院 機電學(xué)院 專業(yè) 機械設(shè)計制造及其自動化 班級 11機自（1） 學(xué)生姓名 徐冠 學(xué)號 1121080133 指導(dǎo)教師 胡曄 題 目 4LBZ-100型水稻收割機的減振設(shè)計 一、畢業(yè)設(shè)計（論文）工作內(nèi)容與基本要求： 1、主要任務(wù)與目標(biāo) （1）文獻(xiàn)綜述：認(rèn)真查閱12篇以上專業(yè)文獻(xiàn)，其中外文資料不少于2篇，并翻譯一篇中文字符2000字以上的外文文獻(xiàn)。 （2）畢業(yè)調(diào)研：完成文獻(xiàn)綜述、開題報告。 （3）完成4LBZ-100型水稻收割機的減振系統(tǒng)總裝圖CAD設(shè)計；完成主要零件的設(shè)計，編寫設(shè)計說明書1萬字以上。 （4）完成畢業(yè)設(shè)計的其它工作（完成指導(dǎo)記錄、資料上傳網(wǎng)絡(luò)設(shè)計平臺、答辯PPT準(zhǔn)備、資料裝訂整理）。 2、主要內(nèi)容與基本要求 （1）主要內(nèi)容： 此型號水稻收割機對整機防振有較高要求，此型號校內(nèi)已有樣機，可進行測繪，然后設(shè)計減振系統(tǒng)，主要在結(jié)構(gòu)上加一些減振裝置，使整機在農(nóng)作運動中的晃動幅度及頻率滿足視覺系統(tǒng)圖像識別的要求。 1）了解減振系統(tǒng)的總體結(jié)構(gòu)，減振系統(tǒng)的組成； 2）完成減振裝置的設(shè)計； （2）要求： 1）實現(xiàn)此型號收割機在工作過程中振動較?。? 2）要求機構(gòu)設(shè)計方案合理、結(jié)構(gòu)緊湊，體積??； 4）完成3張A0圖紙（折合），并要求CAD繪制；減振系統(tǒng)總裝圖一張，主要零件圖； 5）撰寫設(shè)計說明書內(nèi)容包括：課題的目的、意義、國內(nèi)外動態(tài)；研究的主要內(nèi)容；總體方案的擬定和主要參數(shù)的設(shè)計計算；傳動方案的確定，設(shè)計主要零件，進行強度計算，條理清楚，計算有據(jù)；格式按寧波大紅鷹學(xué)院機電學(xué)院機自專業(yè)全日制普通本科生畢業(yè)論文（設(shè)計）規(guī)范化要求。文字在1萬字以上， 6）設(shè)計減振系統(tǒng)，用PRO/E軟件對機架部件建模，自動生成三維圖和二維圖。 7）其他要求：學(xué)生在進行設(shè)計過程中，應(yīng)充分發(fā)揮自己獨立思考和創(chuàng)作設(shè)計，培養(yǎng)和鍛煉工程實際中的發(fā)現(xiàn)問題和解決問題的能力，反對盲從和抄襲行為。設(shè)計期間應(yīng)完成以下工作：查閱相關(guān)文獻(xiàn)資料，其中外文資料不少于兩篇，外文翻譯不低于2000字，英文翻譯必須注明出處，并提供原版PDF文件； 3、設(shè)計參數(shù) 主要技術(shù)要求： 1. 收割機的行走速度為0.5m/s； 2. 運載100KG物品； 3. 設(shè)計壽命10年。 4、主要參考文獻(xiàn) 相關(guān)課程教材； [1]濮良貴，紀(jì)名剛主編.機械設(shè)計（第八版）[M].北京：高等教育出版社，2006.5 [2]成大先主編.機械設(shè)計手冊（第五版）[M].北京：化學(xué)工業(yè)出版社，2008.3 [3]郭宏亮主編.機械原理[M].北京：北京大學(xué)出版社，2011.12 [4]林怡青，謝宋良，王文濤編.機械設(shè)計基礎(chǔ)課程設(shè)計指導(dǎo)書[M].北京：清華大學(xué)出版社，2010.1 [5]顧曉勤，劉申全主編.工程力學(xué)Ⅰ[M]. 北京：機械工業(yè)出版社，2006.1 [6]顧曉勤，劉申全主編.工程力學(xué)Ⅱ[M]. 北京：機械工業(yè)出版社，2006.1 其他文獻(xiàn)自己查找 二、畢業(yè)論文進度計劃 序號 各階段工作內(nèi)容 起訖日期 備注 1 熟悉課題，了解現(xiàn)有減振系統(tǒng)的相關(guān)情況調(diào)研 拿到畢業(yè)設(shè)計任務(wù)書起 到9.30日 2 查閱國內(nèi)外相關(guān)研究資料，并做好筆記 9.16 — 10.31 外文資料不少于兩篇，翻譯不低于2000字，提供原版PDF 3 撰寫文獻(xiàn)綜述 11.1 — 11.7 4 撰寫開題報告 11.8 — 11.15 5 確定4LBZ-100型水稻收割機減振系統(tǒng)的方案和結(jié)構(gòu) 11.15 — 11.22 必要時去相關(guān)企業(yè)調(diào)查學(xué)習(xí) 6 根據(jù)使用要求選擇合適材料，計算幾何結(jié)構(gòu)尺寸 11.22 — 12.7 7 校核結(jié)構(gòu)強度 12.8 — 12.30 12月30日中期檢查 8 繪制減振系統(tǒng)總圖、零件圖 12.31 — 1.21 9 修改 1.22 — 3.31 對格式、文字以及錯誤處 進行修改 10 畢業(yè)答辯準(zhǔn)備 4.1—4.30 資料裝訂完善、上交 11 答辯 5．8 優(yōu)秀畢業(yè)設(shè)計4月19日答辯 三、專業(yè)（教研室）審批意見： 審批人（簽字）： The authors are solely responsible for the content of this technical presentation. The technical presentation does not necessarily reflect the official position of the American Society of Agricultural Engineers (ASAE), and its printing and distribution does not constitute an endorsement of views which may be expressed. Technical presentations are not subject to the formal peer review process by ASAE editorial committees; therefore, they are not to be presented as refereed publications. Citation of this work should state that it is from an ASAE meeting paper. EXAMPLE: Authors Last Name, Initials. Title of Presentation. ASAE Meeting Paper No. xx-xxxx. St. Joseph, Mich.: ASAE. For information about securing permission to reprint or reproduce a technical presentation, please contact ASAE at hqasae.org or 616.429.0300 (2950 Niles Road, St. Joseph, MI 49085-9659 USA). This is not a peer-reviewed article. Paper Number: 01-1127 An ASAE Meeting Presentation Development of A Rice-Seed Pelleting Machine Soo Nam Yoo, Professor Chonnam National University Dept. of Agricultural Engineering, Institute of Agricultural Science Dadiani at al. 1992; Estrade at al. 1993; Longden 1975; Miller at al. 1974; Olsen 1978; Rhodes at al. 1979; Sooter at al. 1978; Hlavacek 1981; Robinson at al. 1983; Konstantinov 1983; Roos at al. 1979; Sachs at al. 1981). Pelleting methods by machines are divided into stamping or tabletting, slurry coating, spray coating, and extruding (Londen 1975; Naito 1963; Miller at al. 1967; Garret at al. 1991,1994; Clarke at al. 1993; Singh 1966). Direct seeding of rice seeds instead of conventional transplanting of rice seedlings for saving labor and cost in rice cultivation has many problems such as lodging, unstable seedling, difficulty of field management, seed loss by birds and rats, seed shifting and concentration by irrigation, and over seeding. Conventional drilling and broadcasting should be turned to precision planting for stabilizing plant growth, and improving productivity. Precision planting enables uniform, rapid, and complete germination and establishment of seeds required by present-day highly mechanized plant cultivation systems. To solve the problems occurred in direct seeding of rice seeds and establish precision planting in rice cultivation, coated or pelleted rice seeds has been tried by the researchers and growers. Simultaneous with development of seed priming technique, coating or pelleting formulation to improve the germination, emergence and establishment of the plant has been the main topics (Chuong at al. 1992; Helms at al. 1991; Yamacuchi at al. 1995; Hagiwara at al.1991; Decker at al. 1990; Soytong at al. 1989; Lee at al. 1996; Kim 2000; Back at al. 1999; Lee at al. 1998,1999). Though these trials have showed useful results, those are only partial successes against the problems for practical application. A ball shaped rice-seed pellet, which is made of clay loam soil. 3 to 5 seeds, and binding agent may solve the most of problems occurred in direct seeding of rice seeds and enables precision machine planting in rice cultivation. But, mass production of uniform rice-seed pellets by a pelleting machine, as well as development of a rice-seed pellets for stable plant growth and precision planting is necessary for practical application. Therefore, Design, construction and performance evaluation of an experimental rice-seed pelleting machine which can be extended for mass production of rice-seed pellets were carried out, and features and planting characteristics of the rice-seed pellets made by the machine were also investigated to prove its effectiveness. 3 Constructional Details Mixer The mixer shown in Figure 1 was designed and constructed to prepare for the pellet material made of rice seeds, soil, and binding solution. The main components include a hopper, twin feeding blades, a mixing and kneading auger, vacuum elements for eliminating the air in pellet material, a driving motor, a power transmission, and frames. By passing through three times at 40 rpm, uniformly mixed and kneaded pellet material was obtained. Figure 1. Schematic diagram of the mixer Pelleting Machine A schematic diagram of the pelleting machine showing functional components is shown in Figure 2. The machine was consisting of a hopper, feeding augers, a feeding block, twin forming rolls with discharging pins, springs for pressing rolls, driving motors, chain and gear transmissions, and frames. Kneaded pellet materials from the hopper are entered by the twin blades to the feeding augers. Pellet materials then are fed into the forming rolls by the augers. The rotating forming rolls form pellet materials to ball shaped pellets, and pellets are discharged from the holes by the pins. Cross-section views of the forming rolls showing forming and discharging operations are shown in Figure 3. Each roll has three rows of 35 semi-spherical perforated holes on the periphery and the diameter of a hole is 12 mm. Two shafts of the rolls are tightened together by tension springs to eliminate the gap between the rolls (not shown in the Figure). The fixed eccentric cams and the pins with compression spring in the rolls discharge formed seed pellets. Surplus pellet materials detached to forming rolls are eliminated by scratching bar. 4 Figure 2. Schematic diagram of the pelleting machine 5 Figure 3. Cross-section views of the forming rolls 6 Materials and Method Materials for pelleting A japonica rice cultivar Dongan adaptable to dry and wet direct seeding cultivations in southern area of Korea was prepared for the rice species. Seed was treated with prochloraz 25% for disinfection. Yeongog Series Clay Loam soil for increasing the weight and size of pellet was gathered and passed through a #35 mesh sieve. The fine soil under particle diameter of 500 m was used for pelleting. Chemical properties of the soil are shown in Table 1. A 10 percent solution of Arabic gum was used as the binding agent. Table 1. Chemical properties of the soil Ex.cat (cmol+/kg) PH (1:5H2O) EC (dS/m) O.M (g/kg) Av.P2O5 (mg/kg) SiO2 (mg/kg) C.E.C (cmol+/kg) K Ca Mg 5.0 0.04 48 1 109 9.9 0.37 2.18 0.93 Performance test Performance test and analysis were carried out as the mixing ratio of soil to rice seed of the pellet materials, and the feeding rate of pellet materials with 3 replications. Pellet materials, whose mixing ratios of soil to rice seed are 6:1, 7:1, and 9:1 (weight base), were fed into the pelleting machine at the feeding rates of 0.5, 1.0, and 1.5 kg/min. Pelleting ratio which indicates the weight ratio of rice seed pellets made perfectly to pellet materials supplied, seed loss ratio which indicates the weight ratio of damaged seeds and seeds included in imperfect rice seed pellets to seeds included in pellet materials supplied, and production capacity of the machine were analyzed. Pellet properties For evaluating the quality of the rice seed pellets made, dimensions, weight, damaged and perfect seeds per a pellet, moisture content, drying time, compression strength of 50 rice-seed pellets selected randomly, and characteristics of plant growth in the field were analyzed. A dryer used in the experiment was made by Hansung Co. (O-D93, 1800W). Compression strength of the pellets dried by dryer and in shady room was measured by the texture analyzer (Stable Micro Systems, TA-XT2). Compression strength means maximum breaking force when the probe is down at the velocity of 2 mm/s. Field test for pellet Field test was carried out to evaluate the plant growth and yield of the pelleted seed compare with that of conventional pregerminated seed at the farm of Chonnam Agriculturall Technology Institute. The test was laid out as a randomised complete block experiment with 3 replications. Pelleted seeds were sown at a seeding depth of under 0.5 cm and a seed spacing of 30 x 10 cm in wet land and conventional pregerminated seeds were drilled on the wet soil surface at a row spacing of 30 cm, a sowing rate of 40 kg/ha. Flooding depths of were 0 cm and 3 cm. Seeding operation was conducted on the 10th of May, 2000. Germination, emergence, and 7 establishment characteristics, and yield were evaluated. Germination was assessed using AOSA method. Resuts and Discussion Performace of the pelleting machine Production capacity of the machine Production capacity of the machine was approximately proportional to feeding rate and was about 61.4 kg/hr at the feeding rate of 1.5 kg/min. and the mixing of 7:1 shown in Figure 4. But, the capacity was decreased as decrease of mixing ratio at the feeding rate of 1.5 kg/min. because of increasing of the imperfect pellets including more than 6 seeds. 0 10 20 30 40 50 60 70 0.5 1 1.5 Feeding rate of pellet materials (kg/min) Pelleting rate (kg/hr) 6 to 1 7 to 1 8 to 1 Mixing ratio Figure 3. Production capacities according to mixing rate and feeding rate of pellet materials Pelleting ratio and seed loss Pelleting ratios shown in Figure 4 were in the range of 61% to 71%. Pelleting ratios were not different at the feeding rates of 0.5 kg/min. and1.0 kg/min., but at the feeding rate of 1.5 kg/min., pelleting ratio were decreased owing to increase of the imperfect pellets which are not formed to uniform ball shape. Generally, pelleting ratios were low values because of increase of the imperfect pellet and loss of pellet materials. Improvement of feeding mechanism fit for the operation condition of the forming rolls and elimination of clearance between the forming rolls were required to increase pelleting ratio. Seed losses at the mixing of 6:1.7:1,and 8:1 were in 8 the ranges of 36% to 48%, 36 % 44 %, and 17 % 28 %, respectively and seed loss was increased as decrease of the mixing ratio shown in Figure 5. 0 20 40 60 80 100 0.5 1 1.5 Feeding rate of pellet materials (kg/min) Pelleting ratio (%) 6 to 1 7 to 1 8 to 1 Mixing ratio Figure 4. Pelleting ratios according to mixing ratio and feeding rate of pellet materials 0 20 40 60 80 100 0.5 1.0 1.5 Feeding rate of pellet materials (kg/min) Seed loss (%) 6 to 1 7 to 1 8 to 1 Mixing ratio Figure 5. Seed loss according to mixing ratio and feeding rate of pellet materials 9 Properties of the pellet Size, weight and moisture content Average diameter of the pellet was 12.0 mm (S.D.=0.1mm) just after manufacturing and was decreased to 11.2 mm (S.D.=0.3mm) after drying. Average weight of the pellet was 1.66 g (S.D.=0.05g) and was decreased to 1.26 g (S.D.=0.04g) after drying. Average moisture content of the pellet was 24.4 % (S.D.= 1.8%). About 6 hours was required to dry it completely by the dryer at the temperature of 43 and About 48 hours was required to reach equilibrium moisture content in shady room at the temperature range of 18 20 and the relative humidity of 30 45 %. Compression strength Compression strength of the pellets dried by dryer and in shady room was measured by the texture analyzer. Compression strength of the pellet dried by the dryer was in the range of 118 N 137 N and that dried in shady room was in the range of 88 N 108 N. There was no significant difference in compression strength as the change of mixing ratio and the feeding rate. But, compression strength decreased abruptly for the pellet includes more than 6 seeds. Number of seeds per pellet Number of seeds per pellet except damaged seeds according to the mixing ratio and the feeding rate was shown in Figure 6. Average numbers of seeds per pellet at the mixing ratio of 6:1, 7:1, and 8:1 were 4.1(S.D.=1.4), 3.6(S.D.=1.2), and 3.1(S.D.=1.3), respectively. Number of Seeds per pellet was increased as the mixing ratio decreases and was not different as the change of feeding rate. Table 2 shows the distribution of the pellets according to number of seeds per pellet. The ratios of pellet includes 3 to 5 seeds at the mixing ratio of 6:1, 7:1, and 8:1 were in the ranges of 76 % 80 %, 75 % 79 %, and 21 % 65 %, respectively. Increase of the pellets includes less than 2 seeds was due to increasing of damaged seeds. To increase the ratio of pellet includes 3 to 5 seeds, improvement of the pelleting machine for reducing the damaged seed is needed. Table 2. Distribution of the pellets according to number of seeds per pellet. Number of rice seeds Mixing ratio Feeding rate (kg/min) Less than 2 3 5 More than 6 0.5 16.0 76.0 8.0 1.0 3.0 80.0 17.0 6 to 1 1.5 3.0 76.0 21.0 0.5 14.0 79.0 7.0 1.0 19.0 77.0 4.0 7 to 1 1.5 18.0 75.0 7.0 0.5 28.0 65.0 7.0 1.0 36.0 60.0 4.0 8 to 1 1.5 66.0 21.0 13.0 10 0 2 4 6 8 0.5 1.0 1.5 Feeding rate of pellet materials Number of rice seeds 6 to 1 7 to 1 8 to 1 Mixing ratio Figure 6. Number of seeds per pellet according to mixing ratio and feeding rate of pellet materials Planting characteristics Highly mechanized plant cultivation systems require uniform, rapid, and complete germination and establishment of seeds. The germination and the establishment performances are shown in Table 3. Germination and establishment rates of the pelleted seeds were higher than those of the conventional pregerminated seeds and both seeds required 5 days for 50 % germination. Seed shifting distance of the pelleted seeds was shorter than that of the pregerminated seeds and floating and lodging ratios of seedling of the pelleted seeds were lower than those of the pregerminated seeds shown in Table 4. These results were due to differences of the seed weight and the seeding depth, and indicate that the pelleted seeds are effective for stabilization of planting. Table 5 shows the yield and its components of the pelleted seeds and the pregerminated seeds. Since spikelet number per panicle, ripened grain rate, 1000 grain weight of brown rice, brown rice ration except number of panicle per m2 of the pelleted seed showed better results than those of the conventional pregerminated seeds, yield of the pelleted seed was slightly higher than that of the pregerminated seed. Field test results showed that the pelletized seeds are available on solving the problems such as lodging, unstable seedling, seed loss by birds and rats, seed shifting and concentration by irrigation, and over seeding, and enable the seeding machine precision planting for stabilization of plant growth, improvement of productivity, labor saving in rice cultivation. 11 Table 3. Germination and establishment Germination (%) Establishment (%) Treatment 8 days after seeding 14 days after seeding Flooding depth of 0 cm Flooding depth of 3 cm Pregerminated seed 72 73 69 65 Pelleted seed 82 85 82 77 Table 4. Establishment characteristics Treatment Seed shifting (cm) Floating seedling (%) Lodging of seedling (%) Pregerminated seed 3.3 14 20 Pelleted seed 1.5 2 5 Table 5. Yield and its components Treatment No. of panicle per m2 No. of spikelet per Panicle Ripened grain rate (%) 1000 grain weight of brown rice (g) Brown rice ration (%) Yield (kg/10a) Pregerminated seed 384 88 87.7 21.8 83.2 451 Pelleted seed 376 95 93.6 22.6 83.9 473 Conclusion Design, construction and performance evaluation of an experimental rice-seed pelleting machine for mass production of rice-seed pellets, and investigation of features and planting characteristics of the seed pellets made by the machine are conducted. Capacity of the pelleting machine was about 61.4 kg/hr and it can be extended by increasing the number of holes grooved on the forming rolls for mass production of the seed pellets. But, pelleting ratio and seed loss results showed that removing clearance between the forming rolls and improvement of the feeding mechanism for reducing damaged seeds and loss of pellet materials are needed. the most of pellets were made uniformly and had about 3 to 4 undamaged seeds. Compression strength of the seed pellets was in the range of 88 N 137 N. The field test results showed that pelleted seeds have better planting performance than the conventional pregerminated seeds. Therefore, precision planting of pelleted seeds can be effective for stabilization of growth, improvement of productivity, labor saving in rice cultivation. 12 Acknowledgments The authors wish to acknowledge Korean Agricultural Research & Development Promotion Center for Support of this project. References Back, N. H., S. S. Kim, S. Y. Kang, M. G. Choi, H. T. Shin, and T. O. Kwan. 1999. Seedling stand influenced by water management after seeding and seed soaking with plant growth regulators in direct wet seeding rice. Korea J. Crop Sci. 44(3):225-229. Bulan, P. 1991. Some effect of seed coating and aging treatments on soybean germination and emergence. Mississippi State Univ. Ph. D. Thesis. Chuong, P. V., and M. Yamaguchi. 1992. Crop establishment of wet direct-seeded rice with the use of resistant variety for anaerobic seeding and oxygen release seed coating chemical calper. Philippine Journal of Crop Sci. 17(1):53. Clarke B., and S. Greenwood Jr. 1993. A viscometric approach to the design of a seed dressing mixer. JAER 56(4):275-283. Dadiani, M., V. V. Shenoy, and D. V. Seshu. 1992. Seed coating to improve stand establishment in rice. Seed Sci. & Technol. 20:307-313. Decker. D. G., M. L. Avery, and M. O. Way. 1990. Reducing black bird damage to newly planted rice with a nontoxic clay-based seed coating. Proceedings. Vertebrate Pest Conference. Vol.14:327-331. Estrade M., malandain M., and Grelu J. 1993. Technique for seed coating with pesticide. Pesticide Sci. 37(2):211-212. Garrett R. E., Mehlschaw J. J., Smith N. E., and M. K. Redenbaugh. 1991. Gel Encapsulation of tomato seeds. ASAE Applied Engineering in Agriculture 7(1):25-. Hagiwara, M., and M. Imura. 1991. Promotion of seedling emergence of paddy rice from flooded soil by coating seed with potassium nitrate. Japanese Journal of Crop Science. 60(3):441-446. Helms, R. S., R. H. Dilday, and R. D. Carlson. 1991. Using GA3 seed treatment in direct seeded rice in southern U.S.A. p.113-114. In direct seeded flooded rice in the tropics. Int. Rice Res. Conf. Seoul, Korea. Hlavacek, J. 1981. The effect of coating material on the germinability and field emergence of sugar-beet seed. Rostlinna Vyroba. 27(10):1071-1078. Kim, S. W. 2000. Studies on development of seed pellet technique for stabilization of direct wet seeding rice. Thesis, Chonnam National University: Kwangju, Korea. Konstantinov, G. 1983. Transplantless growing of cv. Drouzhba tomators using pelleted seeds. Grandinarska I Lozarska Nauka 2094):53-57. Lee, S. C., C. H. Chung, J. H. Kim, and D. S. Song. 1996. Effects of polymer coating on seed vigour in rice. KJCS. 41(3):274-285. Lee, S. S., and J. H. Kim, S. B. Hong. M. K. Kim, and E. H. Park. 1998. Optimum water potential, temperature, and duration for priming of rice seeds. Korean J. Crop Sci. 43(1):1-5. 13 Lee, S. S., and J. H. Kim. 1999. Morphological change, sugar content, and amylase activity of rice seeds under various priming conditions. Korean J. Crop Sci. 43(2):138-142. Longden, P. C. 1975. Sugar beet seed pelleting. ADAS Q. REV. 18:73-80. Miller, W. F., and R. F. Bensin. 1974. Tailoring pelleted seed to soil moisture conditions. New York Food & Life Sci. 7:20-23. Naito, T. 1963. Studies on coating of seeds. Journal of ASAM. 25(1):35-38. Olssen, R. 1978. Minipelletion a coming method for seed dressing of rape and turnip rape. Vaxtskyddsrapporter Sweriges Lantbruksuniversitet 4:208-209. Rhodes, E. T., and D. Nangju. 1979. Effect of pelleting cowpea and soybean seed with fertilizer dusts. Experimental Agriculture. 1591:27-32. Robinson, F. E., K. S. Mayberry, and D. J. Scherer. 1983. Lettuce stand establishment with improved seed pellets. Transactions of the ASAE. 26(1):79-80. Roos, E. E., and F. D. Moore. 1975. Effect of seed coating on performance of lettuce seeds in greenhouse soil tests. J. Amer. Sco. Hort. 100(5):573-576. Singh, J. 1966. Design, construction, and performance evaluation of seed pelleting machine. Agricultural Mechanization in Asia, Africa and Latin America. 27(1):25-28. Soytong, K., and T. H. Quimio. 1989. Biological control of rice blast disease by seed coating with