This work is licensed under a Creative Commons Attribution 4.0 International License.
Efficiency of Land Use in Smallholder Palm Oil Plantations in Indonesia: A Stochastic Frontier Approach
Corresponding Author(s) : Faqih Nur Hidayat
Forest and Society,
Vol. 5 No. 1 (2021): APRIL
Abstract
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- Achten, W. M., & Verchot, L. V. (2011). Implications of Biodiesel-Induced Land-Use Changes for CO₂ Emissions: Case Studies in Tropical America, Africa, and Southeast Asia. Ecology and Society, 16(4). http://dx.doi.org/10.5751/ES-04403-160414
- Agarwal, S., Sing, T. F., & Yang, Y. (2020). The impact of transboundary haze pollution on household utilities consumption. Energy Economics, 85, 104591. https://doi.org/10.1016/j.eneco.2019.104591
- Aigner, D., Lovell, C. K., & Schmidt, P. (1977). Formulation and estimation of stochastic frontier production function models. Journal of econometrics, 6(1), 21-37. https://doi.org/10.2307/2522871
- BPS. (2018). Statistik Kelapa Sawit Indonesia 2017.
- Battese, G. E., & Coelli, T. J. (1995). A model for technical inefficiency effects in a stochastic frontier production function for panel data. Empirical economics, 20(2), 325-332.
- Brühl, C. A., & Eltz, T. (2010). Fuelling the biodiversity crisis: species loss of ground-dwelling forest ants in oil palm plantations in Sabah, Malaysia (Borneo). Biodiversity and Conservation, 19(2), 519-529. DOI 10.1007/s10531-009-9596-4.
- Byerlee, D., Stevenson, J., & Villoria, N. (2014). Does intensification slow crop land expansion or encourage deforestation?. Global food security, 3(2), 92-98. https://doi.org/10.1016/j.gfs.2014.04.001
- Carlson, K. M., Curran, L. M., Asner, G. P., Pittman, A. M., Trigg, S. N., & Adeney, J. M. (2013). Carbon emissions from forest conversion by Kalimantan oil palm plantations. Nature Climate Change, 3(3), 283-287. https://doi.org/10.1038/nclimate1702
- Coelli, T., Singh, S., & Fleming, E. (2003). An input distance function approach to the measurement of technical and allocative efficiency: With application to Indian dairy processing plants. Unpublished manuscript.
- Coelli, T. J., Rao, D. P., O’Donnell, C. J., & Battese, G. E. (1998). An introduction to productivity and efficiency analysis. Springer Science: New York.
- Corley, R. H. V., and P. B. Tinker. (2003). The oil palm. Fourth edition. Blackwell Science, Oxford, UK.
- Euler, M., Hoffmann, M. P., Fathoni, Z., & Schwarze, S. (2016). Exploring yield gaps in smallholder oil palm production systems in eastern Sumatra, Indonesia. Agricultural Systems, 146,111-119. . https://doi.org/10.1016/j.agsy. 2016.04.007
- European Parliament (2017) Palm Oil and Deforestation of Rainforests. European Parliament Resolution of 4 April 2017 on Palm Oil and Deforestation of Rainforests (2016/2222(INI)). 2016 edn. European Parliament, Brussels, Belgium.
- Fairhurst, T., & McLaughlin, D. (2009). Sustainable oil palm development on degraded land in Kalimantan. World Wildlife Fund, Washington, DC. http://www.academia.edu/download/29327572/fairhurst2009.pdf
- FAO, 2017. FAOSTAT Production Statistics. Food and Agricultural Organization of the United Nations, Rome.
- Färe, R., & Primont, D. (1995). Distance functions. In Multi-Output Production and Duality: Theory and Applications (pp. 7-41). Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0651-1_2
- Farrell, M. J. (1957). The measurement of productive efficiency. Journal of the Royal Statistical Society: Series A (General), 120(3), 253-281.
- Ferreira, M. D. P., & Féres, J. G. (2020). Farm size and Land use efficiency in the Brazilian Amazon. Land Use Policy, 99, 104901. https://doi.org/10.1016/j.landusepol.2020.104901
- Fitzherbert, E. B., Struebig, M. J., Morel, A., Danielsen, F., Brühl, C. A., Donald, P. F., & Phalan, B. (2008). How will oil palm expansion affect biodiversity?. Trends in ecology & evolution, 23(10), 538-545. . doi:10.1016/j.tree.2008.06.012
- FoE. (2005) Palm oil—rainforest in your shopping. Friends of the Earth Trust (FoE), London. Available via URL. http://www.foe.co.uk/campaigns/biodiversity/case_studies/palmoil_index.html. Accessed Sep 2020
- FWI. (2014). Lembar Fakta: Pengabaian Kelestarian Hutan Alam dan Gambut, serta Faktor Pemicu Konflik Lahan yang Berkelanjutan. Bogor: Forest Watch Indonesia. (Accessed: 29 juli 2020.)
- FWI. (2018). Angka deforestasi sebagai “Alarm” memburuknya hutan Indonesia. http://fwi.or.id/publikasi/angka-deforestasi-sebagai-alarm-memburuknya-hutan-indonesia/#: (Accessed: 29 Juli 2020)
- Gaworecki M (2016) Norway Commits to Zero Deforestation. Mongabay, 26 May.
- Germer, J., & Sauerborn, J. (2008). Estimation of the impact of oil palm plantation establishment on greenhouse gas balance. Environment, Development and Sustainability, 10(6), 697-716.
- Greenpeace (2007) Palm oil: cooking the climate. Greenpeace International, Amsterdam. Available via URL. http://www.greenpeace.org/international/news/palm-oil_cooking-the-climate. Accessed Sep 2020.
- Hoffmann, M. P., Donough, C., Oberthür, T., Vera, A. C., Wijk, M. T. V., Lim, C. H., ... & Whitbread, A. M. (2015). Benchmarking yield for sustainable intensification of oil palm production in Indonesia using PALMSIM. The Planter, 91(1067), 81-96. http://oar.icrisat.org/id/eprint/9301
- Islam, M. S., Hui Pei, Y., & Mangharam, S. (2016). Trans-boundary haze pollution in southeast asia: sustainability through plural environmental governance. Sustainability, 8(5), 499.https://www.mdpi.com/20711050/8/5/499
- Irz, X. T., & Hadley, D. (2003). Dual Technological Development in Botswana Agriculture-A Stochastic Input Distance Approach (No. 1002-2016-78302). 10.22004/ag.econ.25899
- Irz, X., & Thirtle, C. (2004). Dual technological development in Botswana agriculture: A stochastic input distance function approach. Journal of Agricultural Economics, 55(3), 455-478.
- https://doi.org/10.1111/j.1477-9552.2004.tb00110.x
- Koh, L. P., & Wilcove, D. S. (2008). Is oil palm agriculture really destroying tropical biodiversity?. Conservation letters, 1(2), 60-64. https://doi.org/10.1111/j.1755-263X.2008.00011.x
- Koh, L. P., Ghazoul, J., Butler, R. A., Laurance, W. F., Sodhi, N. S., Mateo-Vega, J., & Bradshaw, C. J. (2010). Wash and spin cycle threats to tropical biodiversity. Biotropica, 42(1), 67-71. https://www.jstor.org/stable/27742864
- Koplitz, S. N., Mickley, L. J., Marlier, M. E., Buonocore, J. J., Kim, P. S., Liu, T., ... & Pongsiri, M. (2016). Public health impacts of the severe haze in Equatorial Asia in September–October 2015: demonstration of a new framework for informing fire management strategies to reduce downwind smoke exposure. Environmental Research Letters, 11(9), 094023. http://dx.doi.org/10.1088/1748-9326/11/9/094023
- Lovell, C.A.K., Richardson, S., Travers, P., Wood, L., (1994). Resources and functionings: a new view of inequality in Australia. In: Eichhorn, W. (Ed.), Models and Measurement of Welfare and Inequality. Springer-Verlag, Berlin. https://doi.org/10.1007/978-3-642-79037-9_41
- Meijaard, E., Sheil, D., (2013). Oil-palm plantations in the context of biodiversity conservation. In: In: Levine, S. (Ed.), Encyclopedia of Biodiversity, vol. 5. Academic Press, Waltham, MA, pp. 600–612. https://doi.org/10.1016/j. envsci.2019.08.004
- Nguyen, H. Q. (2017). Analyzing the economies of crop diversification in rural Vietnam using an input distance function. Agricultural systems, 153, 148-156. https://doi.org/10.1016/j.agsy.2017.01.024
- Pacheco, P., Schoneveld, G., Dermawan, A., Komarudin, H., & Djama, M. (2020). Governing sustainable palm oil supply: Disconnects, complementarities, and antagonisms between state regulations and private standards. Regulation & Governance, 14(3), 568-598. https://doi.org/10.1111/rego.12220
- Polasky, S., Nelson, E., Camm, J., Csuti, B., Fackler, P., Lonsdorf, E., ... & Haight, R. (2008). Where to put things? Spatial land management to sustain biodiversity and economic returns. Biological conservation, 141(6), 1505-1524. https://doi.org/10.1016/j.biocon.2008.03.022
- Pye, O., Daud, R., & Harmono, Y. (2012). Precarious lives: Transnational biographies of migrant oil palm workers. Asia Pacific Viewpoint, 53(3), 330-342. https://doi.org/10.1111/j.1467-8373.2012.01496.x
- Rasmussen, S. (2010). Scale efficiency in Danish agriculture: an input distance–function approach. European Review of Agricultural Economics, 37(3), 335-367. https://doi.org/10.1093/erae/jbq023
- Reddy, N. B. K., & Ramanaiah, Y. V. (1985). Changes in agricultural land use efficiency in Andhra Pradesh: A study by the Standard Coefficient method. Land Use Policy, 2(3), 210-216. https://doi.org/10.1016/0264-8377(85)90069-9
- Rist, L., Feintrenie, L., & Levang, P. (2010). The livelihood impacts of oil palm: smallholders in Indonesia. Biodiversity and conservation, 19(4), 1009-1024. https://doi.org/10.1007/s10531-010-9815-z
- RSPO (2018). About us. Roundtable on Sustainable Palm Oil, Kuala Lumpur, URL: https://rspo.org/about.
- Saharjo, B. H., Putra, E. I., & Atik, U. (2012). Pendugaan Emisi CO2 Sebagai Gas Rumah Kaca Akibat Kebakaran Hutan dan Lahan pada Berbagai Tipe Penutupan Lahan di Kalimantan Tengah Tahun 2000-2009. Jurnal Jurnal Silvikultivar Tropika, 3, 143-148. https://core.ac.uk/download/pdf/230360250.pdf
- Sundaraja, C. S., Hine, D. W., & Lykins, A. (2020). Confronting the palm oil crisis: Identifying behaviours for targeted interventions. EnvironmentalScience & Policy, 103, 99-106. https://doi.org/10.1016/j.envsci.2019.08.004
- Susanti, A., & Maryudi, A. (2016). Development narratives, notions of forest crisis, and boom of oil palm plantations in Indonesia. Forest Policy and Economics, 73, 130-139. https://doi.org/10.1016/j.forpol.2016.09.009
- Sheil, D., Casson, A., Meijaard, E., Van Noordwijk, M., Gaskell, J., Sunderland-Groves, J., ... & Kanninen, M. (2009). The impacts and opportunities of oil palm in Southeast Asia: What do we know and what do we need to know? (Vol. 51). Bogor, Indonesia: Center for International Forestry Research. http://dlc.dlib.indiana.edu/dlc/handle/10535/5256
- Shephard, R.W., 1970, Theory of cost and production functions (Princeton University Press, Princeton).
- The Royal Society (Great Britain). (2009). Geoengineering the climate: Science, governance and uncertainty. Royal Society. https://eprints.soton.ac.uk/156647/
- Varkkey, H., Tyson, A., & Choiruzzad, S. A. B. (2018). Palm oil intensification and expansion in Indonesia and Malaysia: Environmental and socio-political factors influencing policy. Forest Policy and Economics, 92, 148-159. https://doi.org/10.1016/j.forpol.2018.05.002
- Vermeulen, S., & Goad, N. (2006). Towards better practice in smallholder palm oil production. Iied.
- Wang, L., & Li, H. (2014). Cultivated land use efficiency and the regional characteristics of its influencing factors in China: By using a panel data of 281 prefectural cities and the stochastic frontier production function. Geographical Research, 33(11), 1995-2004.
- Wicke, B., Sikkema, R., Dornburg, V., & Faaij, A. (2011). Exploring land use changes and the role of palm oil production in Indonesia and Malaysia. Land use policy, 28(1), 193-206. https://doi.org/10.1016/j.landusepol.2010.06.001
- Wilcove, D. S., & Koh, L. P. (2010). Addressing the threats to biodiversity from oil-palm agriculture. Biodiversity and conservation, 19(4), 999-1007. https://doi.org/10.1007/s10531-009-9760-x
- Woittiez, L. S. (2019). On yield gaps and better management practices in Indonesian smallholder oil palm plantations (Doctoral dissertation, Wageningen University).https://library.wur.nl/ WebQuery/wurpubs/549795
- WWF Indonesia (2008). deforestation forest degradation, biodiveristy loss and C02 emissions in riau sumatera indonesia.https://wwfeu.awsassets.panda.org/downloads/riau_co2_report__wwf_id_27feb08_en_lr_.pdf
- Zhou, Z. M. (2012). Study on Cultivated Land Resources Use Efficiency in Henan. In Advanced Materials Research (Vol. 356, pp. 2921-2924). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/AMR.356-360.2921
References
Achten, W. M., & Verchot, L. V. (2011). Implications of Biodiesel-Induced Land-Use Changes for CO₂ Emissions: Case Studies in Tropical America, Africa, and Southeast Asia. Ecology and Society, 16(4). http://dx.doi.org/10.5751/ES-04403-160414
Agarwal, S., Sing, T. F., & Yang, Y. (2020). The impact of transboundary haze pollution on household utilities consumption. Energy Economics, 85, 104591. https://doi.org/10.1016/j.eneco.2019.104591
Aigner, D., Lovell, C. K., & Schmidt, P. (1977). Formulation and estimation of stochastic frontier production function models. Journal of econometrics, 6(1), 21-37. https://doi.org/10.2307/2522871
BPS. (2018). Statistik Kelapa Sawit Indonesia 2017.
Battese, G. E., & Coelli, T. J. (1995). A model for technical inefficiency effects in a stochastic frontier production function for panel data. Empirical economics, 20(2), 325-332.
Brühl, C. A., & Eltz, T. (2010). Fuelling the biodiversity crisis: species loss of ground-dwelling forest ants in oil palm plantations in Sabah, Malaysia (Borneo). Biodiversity and Conservation, 19(2), 519-529. DOI 10.1007/s10531-009-9596-4.
Byerlee, D., Stevenson, J., & Villoria, N. (2014). Does intensification slow crop land expansion or encourage deforestation?. Global food security, 3(2), 92-98. https://doi.org/10.1016/j.gfs.2014.04.001
Carlson, K. M., Curran, L. M., Asner, G. P., Pittman, A. M., Trigg, S. N., & Adeney, J. M. (2013). Carbon emissions from forest conversion by Kalimantan oil palm plantations. Nature Climate Change, 3(3), 283-287. https://doi.org/10.1038/nclimate1702
Coelli, T., Singh, S., & Fleming, E. (2003). An input distance function approach to the measurement of technical and allocative efficiency: With application to Indian dairy processing plants. Unpublished manuscript.
Coelli, T. J., Rao, D. P., O’Donnell, C. J., & Battese, G. E. (1998). An introduction to productivity and efficiency analysis. Springer Science: New York.
Corley, R. H. V., and P. B. Tinker. (2003). The oil palm. Fourth edition. Blackwell Science, Oxford, UK.
Euler, M., Hoffmann, M. P., Fathoni, Z., & Schwarze, S. (2016). Exploring yield gaps in smallholder oil palm production systems in eastern Sumatra, Indonesia. Agricultural Systems, 146,111-119. . https://doi.org/10.1016/j.agsy. 2016.04.007
European Parliament (2017) Palm Oil and Deforestation of Rainforests. European Parliament Resolution of 4 April 2017 on Palm Oil and Deforestation of Rainforests (2016/2222(INI)). 2016 edn. European Parliament, Brussels, Belgium.
Fairhurst, T., & McLaughlin, D. (2009). Sustainable oil palm development on degraded land in Kalimantan. World Wildlife Fund, Washington, DC. http://www.academia.edu/download/29327572/fairhurst2009.pdf
FAO, 2017. FAOSTAT Production Statistics. Food and Agricultural Organization of the United Nations, Rome.
Färe, R., & Primont, D. (1995). Distance functions. In Multi-Output Production and Duality: Theory and Applications (pp. 7-41). Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0651-1_2
Farrell, M. J. (1957). The measurement of productive efficiency. Journal of the Royal Statistical Society: Series A (General), 120(3), 253-281.
Ferreira, M. D. P., & Féres, J. G. (2020). Farm size and Land use efficiency in the Brazilian Amazon. Land Use Policy, 99, 104901. https://doi.org/10.1016/j.landusepol.2020.104901
Fitzherbert, E. B., Struebig, M. J., Morel, A., Danielsen, F., Brühl, C. A., Donald, P. F., & Phalan, B. (2008). How will oil palm expansion affect biodiversity?. Trends in ecology & evolution, 23(10), 538-545. . doi:10.1016/j.tree.2008.06.012
FoE. (2005) Palm oil—rainforest in your shopping. Friends of the Earth Trust (FoE), London. Available via URL. http://www.foe.co.uk/campaigns/biodiversity/case_studies/palmoil_index.html. Accessed Sep 2020
FWI. (2014). Lembar Fakta: Pengabaian Kelestarian Hutan Alam dan Gambut, serta Faktor Pemicu Konflik Lahan yang Berkelanjutan. Bogor: Forest Watch Indonesia. (Accessed: 29 juli 2020.)
FWI. (2018). Angka deforestasi sebagai “Alarm” memburuknya hutan Indonesia. http://fwi.or.id/publikasi/angka-deforestasi-sebagai-alarm-memburuknya-hutan-indonesia/#: (Accessed: 29 Juli 2020)
Gaworecki M (2016) Norway Commits to Zero Deforestation. Mongabay, 26 May.
Germer, J., & Sauerborn, J. (2008). Estimation of the impact of oil palm plantation establishment on greenhouse gas balance. Environment, Development and Sustainability, 10(6), 697-716.
Greenpeace (2007) Palm oil: cooking the climate. Greenpeace International, Amsterdam. Available via URL. http://www.greenpeace.org/international/news/palm-oil_cooking-the-climate. Accessed Sep 2020.
Hoffmann, M. P., Donough, C., Oberthür, T., Vera, A. C., Wijk, M. T. V., Lim, C. H., ... & Whitbread, A. M. (2015). Benchmarking yield for sustainable intensification of oil palm production in Indonesia using PALMSIM. The Planter, 91(1067), 81-96. http://oar.icrisat.org/id/eprint/9301
Islam, M. S., Hui Pei, Y., & Mangharam, S. (2016). Trans-boundary haze pollution in southeast asia: sustainability through plural environmental governance. Sustainability, 8(5), 499.https://www.mdpi.com/20711050/8/5/499
Irz, X. T., & Hadley, D. (2003). Dual Technological Development in Botswana Agriculture-A Stochastic Input Distance Approach (No. 1002-2016-78302). 10.22004/ag.econ.25899
Irz, X., & Thirtle, C. (2004). Dual technological development in Botswana agriculture: A stochastic input distance function approach. Journal of Agricultural Economics, 55(3), 455-478.
https://doi.org/10.1111/j.1477-9552.2004.tb00110.x
Koh, L. P., & Wilcove, D. S. (2008). Is oil palm agriculture really destroying tropical biodiversity?. Conservation letters, 1(2), 60-64. https://doi.org/10.1111/j.1755-263X.2008.00011.x
Koh, L. P., Ghazoul, J., Butler, R. A., Laurance, W. F., Sodhi, N. S., Mateo-Vega, J., & Bradshaw, C. J. (2010). Wash and spin cycle threats to tropical biodiversity. Biotropica, 42(1), 67-71. https://www.jstor.org/stable/27742864
Koplitz, S. N., Mickley, L. J., Marlier, M. E., Buonocore, J. J., Kim, P. S., Liu, T., ... & Pongsiri, M. (2016). Public health impacts of the severe haze in Equatorial Asia in September–October 2015: demonstration of a new framework for informing fire management strategies to reduce downwind smoke exposure. Environmental Research Letters, 11(9), 094023. http://dx.doi.org/10.1088/1748-9326/11/9/094023
Lovell, C.A.K., Richardson, S., Travers, P., Wood, L., (1994). Resources and functionings: a new view of inequality in Australia. In: Eichhorn, W. (Ed.), Models and Measurement of Welfare and Inequality. Springer-Verlag, Berlin. https://doi.org/10.1007/978-3-642-79037-9_41
Meijaard, E., Sheil, D., (2013). Oil-palm plantations in the context of biodiversity conservation. In: In: Levine, S. (Ed.), Encyclopedia of Biodiversity, vol. 5. Academic Press, Waltham, MA, pp. 600–612. https://doi.org/10.1016/j. envsci.2019.08.004
Nguyen, H. Q. (2017). Analyzing the economies of crop diversification in rural Vietnam using an input distance function. Agricultural systems, 153, 148-156. https://doi.org/10.1016/j.agsy.2017.01.024
Pacheco, P., Schoneveld, G., Dermawan, A., Komarudin, H., & Djama, M. (2020). Governing sustainable palm oil supply: Disconnects, complementarities, and antagonisms between state regulations and private standards. Regulation & Governance, 14(3), 568-598. https://doi.org/10.1111/rego.12220
Polasky, S., Nelson, E., Camm, J., Csuti, B., Fackler, P., Lonsdorf, E., ... & Haight, R. (2008). Where to put things? Spatial land management to sustain biodiversity and economic returns. Biological conservation, 141(6), 1505-1524. https://doi.org/10.1016/j.biocon.2008.03.022
Pye, O., Daud, R., & Harmono, Y. (2012). Precarious lives: Transnational biographies of migrant oil palm workers. Asia Pacific Viewpoint, 53(3), 330-342. https://doi.org/10.1111/j.1467-8373.2012.01496.x
Rasmussen, S. (2010). Scale efficiency in Danish agriculture: an input distance–function approach. European Review of Agricultural Economics, 37(3), 335-367. https://doi.org/10.1093/erae/jbq023
Reddy, N. B. K., & Ramanaiah, Y. V. (1985). Changes in agricultural land use efficiency in Andhra Pradesh: A study by the Standard Coefficient method. Land Use Policy, 2(3), 210-216. https://doi.org/10.1016/0264-8377(85)90069-9
Rist, L., Feintrenie, L., & Levang, P. (2010). The livelihood impacts of oil palm: smallholders in Indonesia. Biodiversity and conservation, 19(4), 1009-1024. https://doi.org/10.1007/s10531-010-9815-z
RSPO (2018). About us. Roundtable on Sustainable Palm Oil, Kuala Lumpur, URL: https://rspo.org/about.
Saharjo, B. H., Putra, E. I., & Atik, U. (2012). Pendugaan Emisi CO2 Sebagai Gas Rumah Kaca Akibat Kebakaran Hutan dan Lahan pada Berbagai Tipe Penutupan Lahan di Kalimantan Tengah Tahun 2000-2009. Jurnal Jurnal Silvikultivar Tropika, 3, 143-148. https://core.ac.uk/download/pdf/230360250.pdf
Sundaraja, C. S., Hine, D. W., & Lykins, A. (2020). Confronting the palm oil crisis: Identifying behaviours for targeted interventions. EnvironmentalScience & Policy, 103, 99-106. https://doi.org/10.1016/j.envsci.2019.08.004
Susanti, A., & Maryudi, A. (2016). Development narratives, notions of forest crisis, and boom of oil palm plantations in Indonesia. Forest Policy and Economics, 73, 130-139. https://doi.org/10.1016/j.forpol.2016.09.009
Sheil, D., Casson, A., Meijaard, E., Van Noordwijk, M., Gaskell, J., Sunderland-Groves, J., ... & Kanninen, M. (2009). The impacts and opportunities of oil palm in Southeast Asia: What do we know and what do we need to know? (Vol. 51). Bogor, Indonesia: Center for International Forestry Research. http://dlc.dlib.indiana.edu/dlc/handle/10535/5256
Shephard, R.W., 1970, Theory of cost and production functions (Princeton University Press, Princeton).
The Royal Society (Great Britain). (2009). Geoengineering the climate: Science, governance and uncertainty. Royal Society. https://eprints.soton.ac.uk/156647/
Varkkey, H., Tyson, A., & Choiruzzad, S. A. B. (2018). Palm oil intensification and expansion in Indonesia and Malaysia: Environmental and socio-political factors influencing policy. Forest Policy and Economics, 92, 148-159. https://doi.org/10.1016/j.forpol.2018.05.002
Vermeulen, S., & Goad, N. (2006). Towards better practice in smallholder palm oil production. Iied.
Wang, L., & Li, H. (2014). Cultivated land use efficiency and the regional characteristics of its influencing factors in China: By using a panel data of 281 prefectural cities and the stochastic frontier production function. Geographical Research, 33(11), 1995-2004.
Wicke, B., Sikkema, R., Dornburg, V., & Faaij, A. (2011). Exploring land use changes and the role of palm oil production in Indonesia and Malaysia. Land use policy, 28(1), 193-206. https://doi.org/10.1016/j.landusepol.2010.06.001
Wilcove, D. S., & Koh, L. P. (2010). Addressing the threats to biodiversity from oil-palm agriculture. Biodiversity and conservation, 19(4), 999-1007. https://doi.org/10.1007/s10531-009-9760-x
Woittiez, L. S. (2019). On yield gaps and better management practices in Indonesian smallholder oil palm plantations (Doctoral dissertation, Wageningen University).https://library.wur.nl/ WebQuery/wurpubs/549795
WWF Indonesia (2008). deforestation forest degradation, biodiveristy loss and C02 emissions in riau sumatera indonesia.https://wwfeu.awsassets.panda.org/downloads/riau_co2_report__wwf_id_27feb08_en_lr_.pdf
Zhou, Z. M. (2012). Study on Cultivated Land Resources Use Efficiency in Henan. In Advanced Materials Research (Vol. 356, pp. 2921-2924). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/AMR.356-360.2921