EFFECT OF THE SYSTEM OF RICE INTENSIFICATION (SRI) ON ...

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15 farmers were chosen randomly from four villages in Chorng Om Pil commune and likewise 15 farmers from four villages in Kdeuon Reay commune. Most farmers had one field where they conducted SRI but a few ones possessed several SRI fields. The smallest SRI field was always chosen in case of farmers having more than one field. If farmers were absent or non available in some way the farmer conducting SRI nearest to them in the village was chosen. See Appendix A for details on participating farmers. 8.1 Soil sampling The farmers grow very different areas of SRI and their fields have very different shapes from one another and are very heterogeneous. The field sizes ranged from 10 m 2 to 2000 m 2 amongst the 30 farmers. Often the water level is changing from spot to spot in the field and the growth of the rice plants is very different within a single field. The soil samples were all collected in the period 12 th to 17 th of October 2008. 19 subsamples forming a star shaped pattern were systematically identified for every field, see Appendix B for full description of the procedure. The 19 subsamples were mixed into one composite sample for every field. The top 20 cm of soil was collected with a stainless steel auger tube with each subsample consisting of 240 cm 3 soil incl. present stones and plant residues. As the fields were very heterogeneous the 19 star systems covered all areas of the field. It would also have been accessible to sample less than 19 subsamples for each field however the level of accuracy is increased with more subsamples. The collected soil samples were analyzed at the Environmental Analysis Laboratory (ENLAB) at the Preak Leap National School of Agriculture (PNSA) in Phnom Penn, Cambodia and at the department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Denmark with three parameters being determined: pH, C and N content. 36
Figure 6. Map of the two target communes Choung Om Pil and Kdoun Reay with the four target villages in each circled with red. Grey stippled lines are commune borders. Modified from SCW (2005). 37
Page 1 and 2: EFFECT OF THE SYSTEM OF RICE INTENS
Page 3 and 4: Abstract The System of Rice Intensi
Page 5 and 6: Preface This report is part of my M
Page 7 and 8: Table of contents Preface..........
Page 9 and 10: 1. Introduction Rice (Oryza sativa
Page 11 and 12: fields will normally result in lowe
Page 13 and 14: materials. These two chapters lead
Page 15 and 16: the process of puddling - which is
Page 17 and 18: Crop residues The use of rice straw
Page 19 and 20: The degree of GHGs emissions will t
Page 21 and 22: are required (app. 150-200 mm) and
Page 23 and 24: • The use of young seedlings tran
Page 25 and 26: Table 1. The major differences betw
Page 27 and 28: Cambodia during modern times. In 19
Page 29 and 30: Rainfed rice in Cambodia is often g
Page 31 and 32: In general there are three types of
Page 33 and 34: 7. Study and experimental implement
Page 35: growing rice but the Cambodian rain
Page 39 and 40: The following main topics were exam
Page 41 and 42: White & Seng (1997) state that not
Page 43 and 44: conditions signifying little or no
Page 45 and 46: Riel 3000000 2800000 2600000 240000
Page 47 and 48: The involved farmers seem to belong
Page 49 and 50: The farmers’ composts were often
Page 51 and 52: chemical fertilizers. It is part of
Page 53 and 54: 9.5.2 SRI techniques The different
Page 55 and 56: t/ha 5,5 5 4,5 4 3,5 3 2,5 2 1,5 1
Page 57 and 58: the farmers are with SRI. Or farmer
Page 59 and 60: forced to sell labour in order to s
Page 61 and 62: households were in average able to
Page 63 and 64: K, only a minor fraction is availab
Page 65 and 66: Table 8. An estimated picture of an
Page 67 and 68: fertilizers which can increase N2O
Page 69 and 70: Table 9. An estimated C budget. It
Page 71 and 72: 10. Conclusion The farmers particip
Page 73 and 74: 11. References Anthofer, J. 2004. T
Page 75 and 76: Moldenhauer, K.A.K. & Gibbons, J. 2
Page 77 and 78: Yue, J., Shi, Y., Liang, W., Wu, J.
Page 79 and 80: APPENDIX B. Soil sampling methodolo
Page 81 and 82: Type How much do you apply to your
Page 83 and 84: APPENDIX E. LIVELIHOOD ASSESTS. Per
Page 85 and 86: 3 2 1 Combination of SRI techniques
Page 87:
APPENDIX F. Interview with Ma Veasn
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