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PERENNIAL GRAINS FOR AFRICA: POSSIBILITY OR PIPEDREAM?

  • SIEGLINDE SNAPP (a1) (a2), PAUL ROGÉ (a2), PATRICK OKORI (a3), REGIS CHIKOWO (a1), BRAD PETER (a2) and JOSEPH MESSINA (a2)...
Summary

Perennial grain crops have been proposed as a transformative approach to agriculture. Replacing annual staple crops with perennialized growth types of the same crops could provide environmental services, improve labour efficiency and weather resilience, reduce seed costs and produce livestock fodder or fuelwood production. Yet, the technologies and science for agricultural development in Africa have focused almost exclusively on annuals. In this paper, we review the literature to explore what has been potentially overlooked, including missed opportunities as well as the disadvantages associated with perennial grains. The case studies of pigeon pea and sorghum are considered, as an analogue for perennial grain crops in Africa. We find that a substantial number of farmers persist in ‘perennializing’ pigeon pea systems through ratoon management, and that sorghum ratoons are widely practiced in some regions. In contrast, many crop scientists are not interested in perennial traits or ratoon management, citing the potential of perennials to harbour disease, and modest yield potential. Indeed, an overriding prioritization of high grain yield response to fertilizer, and not including accessory products such as fodder or soil fertility, has led to multipurpose, perennial life forms being overlooked. Agronomists are encouraged to consider a wide range of indicators of performance for a sustainable approach to agriculture, one that includes management for diversity in crop growth habits.

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This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Corresponding author
Corresponding author. Email: snapp@msu.edu; Contact address: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, USA.
References
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Adebiyi, J. A., Olabisi, L. S. and Snapp, S. S. (2016). Understanding perennial wheat adoption as a transformative technology: Evidence from the literature and farmers. Renewable Agriculture and Food Systems 31:101110. doi:10.1017/S1742170515000150.
Adesina, A. A. and Baidu-Forson, J. (1995). Farmers' perceptions and adoption of new agricultural technology: Evidence from analysis in Burkina Faso and Guinea, West Africa. Agricultural Economics 13:19.
Ajayi, O., Ezueh, M. I., Tabo, R., Asiegbu, J. E. and Singh, L. (1995). Observations on insect damage to pigeon pea in Nigeria. International Chickpea Newsletter 2:7678.
Alumira, J. D. and Rusike, J. (2005). The green revolution in Zimbabwe. Electronic Journal of Agricultural and Development Economics 2:5066.
Andrews, D. J. (1972). Intercropping with sorghum in Nigeria. Experimental Agriculture 8:139150.
Ashby, J. A. (2009). The impact of participatory plant breeding. In Plant Breeding and Farmer Participation, 650671 (Eds Ceccarelli, S., Guimarães, E. P. and Weltzien, E.). Rome, Italy: Food and Agriculture Organization.
Baudron, F., Jaleta, M., Okitoi, O. and Tegegn, A. (2014). Conservation agriculture in African mixed crop livestock systems: Expanding the niche. Agriculture, Ecosystems & Environment 187:171182.
Beedy, T. L., Snapp, S. S., Akinnifesi, F.K. and Sileshi, G.W. (2010). Long-term impact of Gliricidia sepium intercropping and inorganic fertilizer on soil organic matter fractions in maize-based cropping systems. Agriculture Ecosystems & Environment 138:139146.
Bell, L. W., Byrne (nee Flugge), F., Ewing, M. A. and Wade, L. J. (2008). A preliminary whole-farm economic analysis of perennial wheat in an Australian dryland farming system. Agricultural Systems 96:166174. doi:10.1016/j.agsy.2007.07.007.
Buchanan, J. (1885). The Shirè Highlands (East Central Africa) as Colony and Mission (Eds Rankin, J.). London: W. Blackwood; Sons.
Carberry, P. S., Ranganathan, R., Reddy, L. J., Chauhan, Y. S. and Robertson, M. J. (2001). Predicting growth and development of pigeon pea: Flowering response to photoperiod. Field Crops Research 69:151162.
Ceccarelli, S. (2014). GM crops, organic agriculture and breeding for sustainability. Sustainability 6:42734286. doi:10.3390/su6074273.
Chauhan, Y. S., Venkatratnam, N. and Sheldrake, A. R. (1987). Factors affecting growth and yield short-duration pigeon pea and potential for multiple harvests. Journal of Agricultural Science 109:519529.
Childers, D. L., Corman, J., Edwards, M. and Elser, J. J. (2011). Sustainability challenges of phosphorus and food: Solutions from closing the human phosphorus cycle. BioScience 61:117124.
Chipanshi, A. C., Chanda, R. and Totolo, O. (2003). Vulnerability assessment of the maize and sorghum crops to climate change in Botswana. Climatic Change 61:339360.
Cox, T. S., Glover, J. D., Van Tassel, D. L., Cox, C. M. and DeHaan, L. R. (2006). Prospects for developing perennial grain crops. BioScience 56:649659.
Culman, S. W., Snapp, S. S., Ollenburger, M., Basso, B. and DeHaan, L. R. (2013). Soil and water quality rapidly responds to the perennial grain Kernza wheatgrass. Agronomy Journal 105:735744.
DeHaan, L. R. and Van Tassel, D. L. (2014). Useful insights from evolutionary biology for developing perennial grain crops1. American Journal of Botany 101 (10):18011819.
Daniel, J. N. and Ong, C. K. (1990). Perennial pigeon pea: A multi-purpose species for agroforestry systems. Agroforestry Systems 10:113129.
Food and Agriculture Organization of the United Nations (FAO). (2005). A (no date available). Zea mays L., Sorghum bicolor (L.) Moench., Pigeon pea Cajanus cajan (L.) Millsp Grassland species profiles. http://agris.fao.org/agris-search/search.do?recordID=XF2006425545 (last accessed 31 January 2018).
Fritz, S., See, L., McCallum, I., You, L., Bun, A., Moltchanova, E., Duerauer, M., Albrecht, F., Schill, C., Perger, C. and Havlik, P. (2015). Mapping global cropland and field size. Global Change Biology 21 (5):19801992.
Fuglie, K. O. and Rada, N. E. (2013). Resources, policies, and agricultural productivity in Sub-Saharan Africa. ERR-145, U.S. Department of Agriculture, Economic Research Service, February 2013.
Garrity, D. P., Akinnifesi, F. K., Ajayi, O. C., Weldesemayat, S. G., Mowo, J. G., Kalinganire, A., Larwanou, M. and Bayala, J. (2010). Evergreen agriculture: A robust approach to sustainable food security in Africa. Food Security 2:197214.
Gebretsadik, R., Shimelis, H., Laing, M. D., Tongoona, P. and Mandefro, N. (2014). A diagnostic appraisal of the sorghum farming system and breeding priorities in Striga infested agro-ecologies of Ethiopia. Agricultural Systems 123:5461.
Giller, K. E. and Cadisch, G. (1995). Future benefits from biological nitrogen fixation: An ecological approach to agriculture. Plant and Soil 174:255277.
Glover, J. D., Reganold, J. P., Bell, L. W., Borevitz, J., Brummer, E. C., Buckler, E. S., Cox, C. M., Cox, T. S., Crews, T. E., Culman, S. W., DeHaan, L. R., Eriksson, D., Gill, B. S., Holland, J., Hu, F., Hulke, B. S., Ibrahim, A. M. H., Jackson, W., Jones, S. S., Murray, S. C., Paterson, A. H., Ploschuk, E., Sacks, E. J., Snapp, S., Tao, D., Van Tassel, D. L., Wade, L. J., Wyse, D. L. and Xu, Y. (2010). Increased food and ecosystem security via perennial grains. Science 328:16381639.
Glover, J. D., Reganold, J. P. and Cox, C. M. (2012). Agriculture: Plant perennials to save Africa's soils. Nature 489:359361. doi:10.1038/489359a.
Gwata, E. T. and Mzezewa, J. (2013). Optional crop technologies at a semi-arid ecotope in Southern Africa. Journal of Food, Agriculture and Environment 11:291295.
Gwata, E. T. and Silim, S.N. (2009). Utilization of landraces for the genetic enhancement of pigeonpea in Eastern and Southern Africa. Journal of Food, Agriculture and Environment 7:803806.
Harlan, J. R. (1989). Wild grass seed harvesting in the Sahara and Sub-Sahara of Africa. In Foraging and Farming: The Evolution of Plant Exploitation, 7998 (Eds Harris, D. R. and Hillman, G. C.). London, Boston: Unwin Hyman.
Hayes, R. C., Newell, M. T., DeHann, L. R., Murphy, K. M., Crane, S., Norton, M. R., Wade, L. J., Newberry, M., Fahim, M., Jones, S. S., Cox, T. S. and Larkin, P. J. (2012). Perennial cereal crops: An initial evaluation of wheat derivatives. Field Crops Research. 133:6889.
ICRISAT Happenings, No. 1704, (2015). An exercise in demand-driven research, a newsletter report on pigeon pea breeders consultation. Infonet biovision. Maize. 2016. http://www.infonet-biovision.org/PlantHealth/Crops/Maize. (last accessed 12 September 2016).
Isaacs, K., Snapp, S. S., Chung, K. and Waldman, K. (2016). Assessing the value of diverse cropping systems under a new agricultural policy environment in Rwanda. Food Security 8:491506. doi:10.1007/s12571-016-0582-x.
Jackson, L. E., Pulleman, M. M., Brussaard, L., Bawa, K. S., Brown, G. G., Cardoso, I. M., De Ruiter, P. C., García-Barrios, L., Hollander, A. D., Lavelle, P. and Ouédraogo, E. (2012). Social-ecological and regional adaptation of agrobiodiversity management across a global set of research regions. Global Environmental Change 22:623639.
Jackson, W. (1980). New Roots for Agriculture. San Francisco: Friends of the Earth.
Jacobsen, S., Sørensen, M., Pedersen, S. M. and Weiner, J. (2015). Using our agrobiodiversity: Plant-based solutions to feed the world. Agronomy for Sustainable Development 35:12171235. doi:10.1007/s13593-015-0325-y.
Jaikumar, N. S., Snapp, S. S., Flore, J. A. and Loescher, W. (2014). Source versus sink regulation of photosynthesis in annual rye, perennial wheat and perennial rye subjected to modest source/sink ratio changes. Crop Science 54:274283.
Jaikumar, N. S., Snapp, S. S., Murphy, K. and Jones, S. S. (2012). Agronomic assessment of perennial wheat and perennial rye as cereal crops. Agronomy Journal 104:17161726. https://org/10.2134/agronj2012.0291.
Jarvis, A., Ramirez-Villegas, J., Campo, B. V. H. and Navarro-Racines, C. (2012). Is cassava the answer to African climate change adaptation?. Tropical Plant Biology 5:929.
Johnson, E. R. and Goldstein, J. (2015). Biomimetic futures: Life, death, and the enclosure of a more-than-human intellect. Annals of the Association of American Geographers 105:387396. doi:10.1080/00045608.2014.985625.
Jones, K., Glenna, L. L. and Weltzien, E. (2014). Assessing participatory processes and outcomes in agricultural research for development from participants’ perspectives. Journal of Rural Studies 35:91100. doi:10.1016/j.jrurstud.2014.04.010.
Kamai, N., Gworgwor, N. A. and Wabekwa, J. W. (2014). Varietal trials and physiological components determining yield differences among cowpea varieties in semiarid zone of Nigeria. ISRN Agronomy. doi:https://doi.org/10.1155/2014/925450.
Kane, D., Rogé, P. and Snapp, S. S. (2016). A systematic review of perennial staple crops literature using topic modeling and bibliometric analysis. PLoS One 11:e0155788.
Kante, M., Rattunde, H. F. W., Leiser, W. L., Nebié, B., Diallo, B., Diallo, A., Touré, A. O., Weltzien, E. and Haussmann, B. I. (2017). Can tall guinea-race sorghum hybrids deliver yield advantage to smallholder farmers in West and Central Africa? Crop Science 57:833842.
Keeley, J. and Scoones, I. (2000). Knowledge, power and politics: The environmental policy-making process in Ethiopia. The Journal of Modern African Studies 38:89120.
Kell, D. B. (2012). Large-scale sequestration of atmospheric carbon via plant roots in natural and agricultural ecosystems: Why and how. Philosophical Transactions Royal Society of Britian Biology 367:15891597.
Kfir, R. (1997). Competitive displacement of Busseola fusca (Lepidoptera: Noctuidae) by Chilo partellus (Lepidoptera: Pyralidae). Annals of the Entomological Society of America 90:619624.
Kimani, E. N., Wachira, F. N. and Kinyua, M. G. (2012). Molecular diversity of Kenyan Lablab bean (Lablab purpureus (L.) Sweet) accessions using amplified fragment length polymorphism markers. American Journal of Plant Science 3:313321.
Kimani, P. M. (2000). Pigeon pea breeding: Objectives, experiences, and strategies for Eastern Africa. In Status and Potential of Pigeon Pea in Eastern and Southern Africa: Proceedings of a Regional Workshop, 12–15 Sept. 2000, Nairobi, Kenya (Eds S. N. Silim, G. Mergeai and P. M. Kimani). B-5030 Gembloux, Belgium: Gembloux Agricultural University; and Patancheru 502 324, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT).
Kimber, C., Dahlberg, J. and Kresovich, S. (2013). The gene pool of Sorghum bicolor and its improvement. In Genomics of the Saccharinae, vol. 11, 23–41 (Ed Patterson, A. H.):. doi:10.1007/978-1-4419-5947-82.
Kristjanson, P., Okike, I., Tarawali, S., Singh, B. B. and Manyong, V. (2005). Farmers’ perceptions of benefits and factors affecting the adoption of improved dual-purpose cowpea in the dry savannas of Nigeria. Agricultural Economics 32:195210.
Labeyrie, V., Deu, M., Dussert, Y., Rono, B., Lamy, F., Marangu, C., Kiambi, D., Calatayud, C., Coppens d'Eeckenbrugge, G., Robert, T. and Leclerc, C. (2016). Past and present dynamics of sorghum and pearl millet diversity in Mount Kenya region. Evolutionary Applications 9:12411257.
Larkin, P. J., Newell, M. T., Hayes, R. C., Aktar, J., Norton, M. R., Moroni, S. J. and Wade, L. J. (2014). Progress in developing perennial wheats for grain and grazing. Crop & Pasture Science 65:11471164. doi:10.1071/CP13330.
Lawn, R. J. (1989). Agronomic and physiological constraints to the productivity of tropical grain legumes and prospects for improvement. Experimental Agriculture 25:509528.
Malawi Guide to Agriculture (2010). Government of Malawi, Lilongwe, Malawi. https://trove.nla.gov.au/version/13320976
Mandal, R. C., Vidyabhushanam, R. V. and Santhanam, V. (1965). Ratooning in hybrid sorghum gives more food and fodder. Indian Farming 15:3031.
McGuire, S. (2002). Farmers’ views and management of sorghum diversity in Western Harerghe, Ethiopia: Implications for collaboration with formal breeding. In ‘Collaborative Plant Breeding: Integrating Farmers’ and Plant Breeders’ Knowledge and Practice’, 107136 (Eds Cleveland, D. and Soleri, D.). Wallingford, Oxon: CABI.
Mekbib, F. (2009). Farmers’ breeding of sorghum in the centre of diversity, Ethiopia: I. Socio-Ecotype differentiation, varietal mixture and selection efficiency. Maydica 54:2537.
Ministry of Agriculture and Food Security (MoAFS) (2012). Agricultural Production Estimates Survey (APES) Crop Production and Area Harvested by Extension Planning Area. Government of Malawi, Lilongwe, Malawi.
Mishra, A., Hansen, J. W., Dingkuhn, M., Baron, C., Traore, S. B., Ndiaye, O. and Ward, M. N. (2008). Sorghum yield prediction from seasonal rainfall forecasts in Burkina Faso. Agricultural and Forest Meteorology 148:17981814.
Mofokeng, M. A., Shimelis, H. and Laing, M. D. (2016). Constraints and varietal trait preferences of sorghum producers in South Africa. Journal of Tropical Agriculture 54:715.
Mohyuddin, A. I. and Greathead, D. J. (1970). An annotated list of the parasites of graminaceous stem borers in East Africa with a discussion of their potential in biological control. Entomophaga 15:241274.
Montpellier Panel, The (2013). Sustainable Intensification: A New Paradigm for African Agriculture, London.
Moore, H. L. and Vaughan, M. (1994). Cutting down trees: Gender, nutrition, and agricultural change in the Northern Province of Zambia, 1890–1990. Social History of Africa. Portsmouth, NH, Heinemann.
Morris, G. P., Ramu, P., Deshpande, S. P., Hash, C. T., Shah, T., Upadhyaya, H. D., Riera-Lizarazu, O., Brown, P. J., Acharya, C. B., Mitchell, S. E. and Harriman, J. (2013). Population genomic and genome-wide association studies of agroclimatic traits in sorghum. Proceedings of the National Academy of Sciences 110:453458.
Myaka, F. M., Sakala, W. D., Adu-Gyamfi, J. J., Kamalongo, D., Ngwira, A., Odgaard, R. and Høgh-Jensen, H. (2006). Yields and accumulations of N and P in farmer-managed intercrops of maize–pigeon pea in semi-arid Africa. Plant and Soil 285:207220.
Ntare, B. R. and Williams, J. H. (1992). Response of cowpea cultivars to planting pattern and date of sowing in intercrops with pearl millet in Niger. Experimental Agriculture 28:4148.
Omanga, P. A., Summerfield, R. J. and Qi, A. (1995). Flowering of pigeon pea (Cajanus cajan) in Kenya: Responses of early-maturing genotypes to location and date of sowing. Field Crops Research 41:2534.
Orr, A., Kambombo, B., Roth, C., Harris, D. and Doyle, V. (2015). Adoption of integrated food-energy systems: Improved cook stoves and pigeon pea in southern Malawi. Experimental Agriculture 51:191209.
Ortega, D. L., Waldman, K. B., Richardson, R. B., Clay, D. and Snapp, S. S. (2016). Sustainable intensification and farmer preferences for crop system attributes: Evidence from Malawi's Central and Southern regions. World Development 87:139151.
Pachico, D. (2014). Towards appraising the impact of legume research: A synthesis of evidence. In Standing Panel on Impact Assessment (SPIA), CGIAR Independent Science and Partnership Council, Rome, Italy, 39 pp.
Paterson, A. H., Cox, T. S., Wegian, K. and Navarro, M. (2014). Viewpoint: Multiple-harvest sorghums toward improved food security. In Perennial Crops for Food Security, Proceedings of the FAO Expert Workshop, Food and Agricultural Organization, Rome, 90 pp.
Peter, B., Mungai, L., Messina, J. P. and Snapp, S. S. (2017). Nature-based agricultural solutions: Scaling perennial grains across Africa. Environmental Research 159:283290.
Petersen, B. and Snapp, S. S. (2015). What is sustainable intensification: Views from experts. Land Use Policy 46:110. doi:10.1016/j.landusepol.2015.02.002.
Pingali, P. L. (2001). Meeting world maize needs: Technological opportunities and priorities for the public sector. CIMMYT 1999/2000 World Maize Facts and Trends.
Plucknett, D. L., Evenson, J. P. and Sanford, W. G. (1970). Ratoon cropping. Advances in Agronomy 22:285330.
Rao, P. S., Rathore, A. and Reddy, B. V. (2013). Interrelationship among biomass related traits and their role in sweet Sorghum cultivar productivity in main and ratoon crops. Sugar Technology 15:278284.
Rasse, D. P., Rumpel, C. and Dignac, M. (2005). Is soil carbon mostly root carbon? Mechanisms for a specific stabilization. Plant and Soil 269:341356.
Reddy, B. V., Sharma, H. C., Thakur, R. P., Ramesh, S., Rattunde, F. and Mgonja, M. (2006). Sorghum hybrid parents research at ICRISAT-strategies, status and impacts. Journal of Semi-Arid Tropics Agricultural Research 2: 124.
Rogé, P., Diarisso, T., Diallo, F., Boiré, Y., Goïta, D., Peter, B., Macalou, M., Weltzien, E. and Snapp, S. S. (2017). Perennial grain crops in the West Soudanian Savanna of Mali: Perspectives from agroecology and gendered spaces. International Journal of Sustainable Agriculture 15:555574.
Rogé, P., Snapp, S. S., Kakwera, M. N., Mungai, L., Jambo, I. and Peter, B. (2016). Ratooning and perennial staple crops in Malawi. A Review. Agronomy for Sustainable Development 36 (3). doi:10.1007/s13593-016-0384-8.
Rusinamhodzi, L., Makoko, B. and Sariah, J. (2017). Ratooning pigeon pea in maize-pigeon pea intercropping: Productivity and seed cost reduction in eastern Tanzania. Field Crops Research 203:2432.
Sánchez, B., Rasmussen, A. and Porter, J. R. (2014). Temperatures and the growth and development of maize and rice: A review. Global Change Biology 20:408417.
Sardana, V., Sharma, P. and Sheoran, P. (2010). Growth and production of pulses. Soils, Plant Growth and Crop Production 3:378416.
Scoones, I. (2015). Transforming soils: Transdisciplinary perspectives and pathways to sustainability. Current Opinion in Environmental Sustainability 15:2024.
Silim, S. N. and Omanga, P. A. (2001). The response of short-duration pigeon pea lines to variation in temperature under field conditions in Kenya. Field Crops Research 72 (2), 97108.
Simtowe, F., Shiferaw, B., Kassie, M., Abate, T., Silim, S., Madzonga, M., Muricho, G. and Kananji, G. (2010). Assessment of the current situation and future outlooks for the pigeon pea sub-sector in Malawi. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India.
Smaje, C. (2015). The strong perennial vision: A critical review. Agroecology and Sustainable Food Systems 39:471499.
Smith, A., Snapp, S. S., Dimes, J., Gwenambira, C. and Chikowo, R. (2016). Doubled-up legume rotations improve soil fertility and maintain productivity under variable conditions in maize-based cropping systems in Malawi. Agricultural Systems 145:139149.
Smith, R. J. (1929). Tree Crops: A Permanent Agriculture, Friends of the Land, Devin-Adaid, New York, NY, USA, 410 pp.
Snapp, S. S., Blackie, M. J., Gilbert, R. A., Bezner-Kerr, R. and Kanyama-Phiri, G. Y. (2010). Biodiversity can support a greener revolution in Africa. Proceedings of the National Academy of Sciences 107:2084020845.
Snapp, S. S., Rohrbach, D. D., Simtowe, F. and Freeman, H. A. (2002). Sustainable soil management options for Malawi: Can smallholder farmers grow more legumes? Agriculture Ecosystems and Environment 91:159174.
Snapp, S. S. and Silim, S. N. (2002). Farmer preferences and legume intensification for low nutrient environments. Plant and Soil 245:181192. doi:10.1023/A:1020658715648.
Stamp, P. and Visser, R. (2012). The twenty-first century, the century of plant breeding. Euphytica 186:585591. doi:10.1007/s10681-012-0743-8.
Tayo, T. O. (1985). Assessment of the effect of ratooning pigeon pea (Cajanus cajan (L.) Millsp.) in the lowland tropics. The Journal of Agricultural Science 104:589593.
Tomlinson, I. (2013). Doubling food production to feed the 9 billion: A critical perspective on a key discourse of food security in the UK. Journal of Rural Studies 29:8190.
Valbuena, D., Erenstein, O., Tui, S. H. K., Abdoulaye, T., Claessens, L., Duncan, A. J., Gérard, B., Rufino, M. C., Teufel, N., van Rooyen, A. and van Wijk, M. T. (2012). Conservation agriculture in mixed crop–livestock systems: Scoping crop residue trade-offs in Sub-Saharan Africa and South Asia. Field Crops Research 132:175184.
Valenzuela, H. and Smith, J. (2002). Pigeon pea. Sustainable Agriculture Green Manure Crops. Cooperative Extension Service. College of Tropical Agriculture and Human Resources, University of Hawai'I, Manoa, HI.
Van Tassel, D. L., DeHaan, L. R. and Cox, T. S. (2010). Missing domesticated plant forms: Can artificial selection fill the gap? Evolutionary Applications 3:434452.
Vaughan, M. (1987). The Story of an African Famine: Gender and Famine in Twentieth-Century Malawi. New York: Cambridge University Press.
Vavilov, N. I. (1934). Soviet scientific plant industry during the period of soviet reconstruction 1930–1933. Bulletin of Applied Botany Leningrad, Series A 10:523.
Vico, G. and Brunsell, N. A. (2018). Tradeoffs between water requirements and yield stability in annual vs. perennial crops. Advances in Water Resources. 112:189202.
Vinutha, K. S., Kumar, G. A., Blümmel, M. and Rao, P. S. (2017). Evaluation of yield and forage quality in main and ratoon crops of different sorghum lines. Tropical Grasslands-Forrajes Tropicales 5:4049.
Waldman, K. B., Ortega, D. L., Richardson, R. B. and Snapp, S. S. (2017). Estimating demand for perennial pigeon pea in Malawi using choice experiments. Ecological Economics 131:222230.
Willey, R. W., Rao, M. R., Reddy, M. S. and Natarajan, M. (1982). Cropping systems with sorghum. In Sorghum in the Eighties: Proceedings of the International Symposium on Sorghum, 2–7 November, 1981. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Andhra Pradesh, India, pp. 477–490.
Wilson, K. S. L. (2011). Sorghum ratooning as an approach to manage covered kernel smut and the stem borer Chilo Partellus. PhD. Thesis. University of Greenwich, London, UK.
Wood, L. and Moriniere, L. (2013). Malawi climate change vulnerability assessment annex D. Crop Phenology. USAID—African and Latin American Resilience to Climate Change (ARCC).
Zhao, X., Zhang, T., Huang, L., Wu, H., Hu, F., Zhang, F., Zhu, L. and Fu, B. (2012). Comparative metabolite profiling and hormone analysis of perennial and annual rice. Journal of Plant Biology 55:7380. doi:10.1007/s12374-011-9192-5.
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