1. Gross margin analysis - rhizobium trials Samlaut 2008
Presented by Keo Kynal
For
Fiona Scott

2. Assumptions riel US$ Urea per kg 3,360 $0.82
Planting (person day) 12,750 $3.11
Weeding (person day) 12,667 $3.09
Maize harvest (60 kg bag) 3,000 $0.73
Harvesting (person day) 12,750 $3.11
Threshing (person day) 13,333 $3.25
Rhizobium cost (ha) $5.00

3. Seed prices riel/kg $/kg Maize 14,781 $3.61 Soybean 2,998 $0.73
Mungbean 3,125 $0.76
Peanut 4,733 $1.15

4. Grain prices riel/kg $/kg $/t Maize 418 0.10 101.83
Soybean 1,
Mungbean 2,
Peanut 2,

5. Peanut harvest and threshing costs (people per ha per day)
Yield Harvest Threshing Cost/ha ($)
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6. Peanut input costs Operation Unit Unit No Value value of units riel $
First ploughing rai 40, ,
Second plough rai 25, ,
Seed kg 4, ,
Planting p/d 12, ,
1st weeding p/d 12, ,
2nd weeding p/d 12, ,
3rd weeding p/d 12, ,
Harvest & threshing costs are not included here since they vary with yield

7. Soybean

8. Mungbean

9. Peanut

10. Issues Site 1 was damaged by pig and chicken – too close to house
Site 2 may have been high fertility (no nitrate test) – soybean does not respond to inoculation under these conditions

11. Conclusions Gross margins:
peanut ($1,500-2,000/ha) 
mungbean ($ ) 
soybean ($ /ha) 
Rhizobium inoculation increased peanut GM by $613/ha
Rhizobium inoculation increased mungbean GM by $181/ha
Soybean did not respond to inoculation (see issues)
Small farmers have given up on mungbean because of high harvest and threshing costs and low yields

12. Thank you