Abstract
An intensive dairy and crop farming system found in the East African highlands provides manure and urine, taken from stalls of improved dairy cattle, for crops such as banana. By using panel data of 894 rural households in 2003 and 2005 in Uganda, we find that the number of improved cattle per ha increases the organic fertilizer application on banana plots by 218 kg/ha. Regarding the banana yield, we find that 1 ton of the organic fertilizer per ha increases the banana yield by 10%, and a one percentage point increase in the soil organic matter (SOM) increases the banana yield by 7%. Because the organic fertilizer application improves the SOM in the long run, it has a long-term impact on the banana yield.
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Notes
- 1.
The original sample size was 940. The second survey could not either find or interview 45 households, resulting in a 4.8% attrition rate. Because the attrition rate is small, we do not think that the attrition causes significant biases in our estimations.
- 2.
Other chapters in this book use soil fertility data that were analyzed at the World Agroforestry Center (ICRAF) by using the near-infrared reflectance spectroscopy (NIRS). In Uganda, however, soil samples were also analyzed at the NARO laboratory also. Because the NARO data were analyzed by usual chemical tests, not the NIRS, and were considered more accurate, we use the NARO data. The two data sets have a high correlation.
- 3.
The definitions of the three regions are provided at the bottom of Table 9.1.
- 4.
We define communal land as any land that local people have common access to. Among the 94 communities in our samples, there are 82 patches of communal land. Out of them, 62 patches are communal grazing or pasture land, 14 are private land but open to the public, and the rest are bush and natural forests. Among the 62 patches of communal grazing land or pasture land, only 5 patches have any use restrictions, while 6 patches of the 14 privately owned land have restrictions.
- 5.
This makes the impact of the number of cattle on the organic fertilizer application underestimated as compared to only counting the number of cows and bulls. In this chapter, we should consider the impact of the number of cattle as the impact of any cattle. We may employ a scaling unit to convert the number of any cattle into the number of cows or bulls.
- 6.
We conduct a simple simulation by predicting the censored dependent variables when we change the value of the independent variable from one value to another.
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Yamano, T. (2011). Dairy–Banana Integration and Organic Manure Use in Uganda. In: Yamano, T., Otsuka, K., Place, F. (eds) Emerging Development of Agriculture in East Africa. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1201-0_9
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