Effects of Combine Harvesting on Head Rice Yield and Chaff Content of Long and Short Grain Paddy Harvest in Sri Lanka

Published Date
2016, Vol.6:242–245, doi:10.1016/j.profoo.2016.02.029
International Conference of Sabaragamuwa University of Sri Lanka 2015 (ICSUSL 2015)
Open Access, Creative Commons license

Author 

U.G. Chandrajith ^,

D.M.C.C. Gunathilake

B.D.M.P. Bandara

D.P.C. Swarnasiri

Institute of Post Harvest Technology, Jayanthi Mawatha, Anuradhapura, 50000, Sri Lanka

Available online 30 March 2016. 

Abstract

Paddy harvesting is the process of collecting the mature rice crop from the field which consists of activities such as cutting, handling, threshing and cleaning. Cutting, threshing and cleaning plays an important role to reduce postharvest losses. Lower performance of traditional harvesting process, labour shortage, reduced turn-around time and use of high yielding varieties have inevitably forced farmers to shift into mechanical grain harvesting in Sri Lanka. Rice milling is carried out to produce an edible polished or white rice product from harvested rough rice. Head rice yield is considered for marketing purposes because broken rice has low price in the market. Field survey was conducted in Polonnaruwa, Ampara and Hambanthota districts to identify most popular types of combine harvesters operating in the above districts. Paddy samples were collected from harvest of two most popular models of combine harvester in triplicate. Paddy sample of 1m² area from every paddy field were harvested separately by manual harvesting followed by manual threshing and cleaning in laboratory as control sample of relevant paddy field. Moisture content of the paddy grains were measured in the paddy field using digital moisture meter before harvesting. Paddy samples were subjected to sun drying until the moisture content come down to 14±1% before the quality analysis in the laboratory. Each paddy sample was analyzed for moisture content, chaff percentage and head rice yield percentage (HRY). Paddy was milled using laboratory scale rubber roll sheller and abrasive polisher. Chaff content percentage was measured by adding 100 ml of paddy to water and volume of chaff was measured using graduated cylinder. HRY was calculated dividing the weight of grain partials, which are larger than the ³/₄ of the grain, by weight of paddy sample. HRY between the two combine harvesting machine models evaluated were not significantly different at p<0.05 and also it was not significantly dependent on the harvesting methods such as combine harvesting and manual harvesting. The chaff content was significantly higher in model-2 in comparison to control sample for long grain paddy while model-1 was not significantly different with control sample for short grain paddy.

Keywords

Combine Harvester

Paddy

Haed Rice Yield

Chaff

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References

1. • [1]
   • http ://www.fao.org/docrep/006/Y4751E/y4751e0o.htm [Accessed: 12-02-2015].
2. • [2]
   • G.V.T.V. Weerasuriya, M.H.M.A. Bandara, M. Rambanda
   • Performance evaluation of four wheel tractor driven high capacity combine paddy thresher
   • Tropical agricultural research, Volume 22, Issue 3, 2011, pp. 273–281
3. • [3]
   • http ://www.knowledgebank.irri.org/step-by-step-production/postharvest [Accessed 19-07-2014].
4. • [4]
   • M.N. Amarasinghe, G.C. Samaraweera
   • Economics impacts of using combine harvesters in paddy cultivation in Hambantota district
   • Proceedings of the 8^th academic sessions, University of Ruhuna, Volume 08, 2010, p. 202
5. • [5]
   • Wayne EM, Wadsworth JI. Rice science and technology. Marcell and Dekker.USA. 139-141.

• ☆
  Peer-review under responsibility of International Conference of Sabaragamuwa University of Sri Lanka 2015 (ICSUSL 2015).

• ⁎ 
  Corresponding author. Tel.: +94-25-2222344; fax: +94-25-2223983.

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