Effect of climate warming on maize production in Timor-Leste: interaction with nitrogen supplySamuel A. Bacon A D , Raimundo Mau B , Florindo M. Neto B , Robert L. Williams A C and Neil C. Turner C
A Seeds of Life/Fini ba Moris, Ministry of Agriculture and Fisheries, Comoro, Dili, Democratic Republic of Timor-Leste.
B Ministry of Agriculture and Fisheries, Comoro, Dili, Democratic Republic of Timor-Leste.
C The UWA Institute of Agriculture and Centre for Plant Breeding and Genetics, The University of Western Australia, M080, Stirling Highway, Crawley, WA 6009, Australia.
D Corresponding author. Email: email@example.com
Crop and Pasture Science 67(2) 156-166 http://dx.doi.org/10.1071/CP15078
Submitted: 5 March 2015 Accepted: 22 October 2015 Published: 29 February 2016
Climate change is predicted to decrease crop yields in semi-arid and subtropical regions of the world and this could negatively affect smallholder farmers in the developing world. Previous analysis has suggested that with low fertiliser input, yields of sorghum increased as temperatures increased. We used the wide range of tropical environments in the small mountainous island country of Timor-Leste to evaluate the impact of global warming on maize (Zea mays) yields with (i) no fertiliser input and (ii) increased nitrogen (N) supply. We calibrated the well-tested APSIM-Maize model for the cultivar of maize grown throughout Timor-Leste. We simulated maize yields at four locations with 8 years of reliable weather records, at present temperatures, +1.5°C and +3.0°C, with 0, 40 and 80 kg/ha of added N, with 1.2, 1.9 and 3.8% soil organic carbon (SOC), and with increased duration of the vegetative phase. With no added N, higher temperatures increased yields at the cooler, higher elevation sites and decreased yields at the warmest site near the coast. With fertiliser application, warming temperatures decreased yields or induced no change in simulated yield at all locations. Simulations with three levels of N supply for the four sites, which differed in temperature, showed a strong temperature × N supply interaction on yield. At maximum growing-season temperatures >31°C, yields decreased with increasing temperature at all levels of fertilisation. At maximum growing-season temperatures of 23-31°C, yields increased with increasing temperature with no added fertiliser, were unchanged with the application of 40 kg N/ha, and decreased with increasing temperatures with application of 80 kg/ha N. The changes in yield with temperature and N supply were associated with N uptake by the maize, which showed the same interaction with maximum temperature and N added. SOC acted as a source of N, so that changes in yield induced by temperature and N were similar whether the N was from an organic or an inorganic source. Increasing the duration of the vegetative phase resulted in lower or no change in yields at all sites. We conclude that global warming will increase the yield for low-input smallholder farmers growing maize at maximum growing-season temperatures <31°C, but that micro-dosing with N will increase yields at all locations with mean maximum temperatures of 20-35°C.
Additional keywords: crop simulation, nitrogen uptake, phenology.
ReferencesARPAPET (1996) Agro-climatic zones of East Timor. Dili, Timor, Indonesia: Indonesia–Australia Development Corporation. Agricultural and Regional Planning Assistance Program East Timor, Kantor Wilayah Departemen Pertanian Propinsi Timor Timur, Jalan Estrada de Balide, Dili, Timor-Leste.
Asseng S, Foster I, Turner NC (2011) The impact of temperature variability on wheat yields. Global Change Biology 17, 997–1012.
| The impact of temperature variability on wheat yields.CrossRef |
Australian Bureau of Meteorology and CSIRO (2014) Climate variability, extremes and change in the western tropical Pacific: New science and updated country reports 2014. Volume 2: Country Reports. pp. 49–63. (Pacific Climate Change Science: Aspendale, Vic.)
Cenicero FG, Palme B, Piggin C, San Valentin G, Tilman de sa Benevides F, De Oleivera A (2003) Challenges and opportunities for maize research in East-Timor—results of variety identification during the 2000 and 2001 cropping seasons. In ‘Agriculture: new directions for a new nation—East Timor (Timor-Leste)’. ACIAR Proceedings No. 113. (Eds H Da Costa, C Piggin, CJ Cruz, JJ Fox) pp. 72–78. (Australian Centre for International Agricultural Research: Canberra, ACT)
Cooper P, Rao KPC, Singh P, Dimes J, Traore PS, Dixit P, Twomlow SJ (2009) Farming with current and future climate risk: advancing a ‘Hypothesis of Hope’ for rainfed agriculture in the semi-arid tropics. Journal of SAT Agricultural Research 7, (http://ejournal.icrisat.org/aespaperv7).
Fischer RA, Byerlee D, Edmeades GE (2014) ‘Crop yields and global food security: will yield increase continue to feed the world?’ ACIAR Monograph No. 158. (Australian Centre for International Agricultural Research: Canberra, ACT)
Fox JJ (2003) Drawing from the past to prepare for the future: Responding to the challenges of food security in East-Timor. In ‘Agriculture: New directions for a new nation East Timor (Timor-Leste)’. ACIAR Proceedings No. 113. (Eds HD Costa, C Piggin, CJ Cruz, JJ Fox) pp. 105–114. (Australian Centre for International Agricultural Research: Canberra, ACT)
Garcia JS, Cardosa JC (1978) ‘Os Solos de Timor. Memórias da Junta de Investigações Científicas do Ultramar, No. 64 Segunda Sérié.’ (Lisbon: Portugal)
Holzworth DP, Huth NI, deVoil PG, Zurcher EJ, Herrmann NI, McLean G, Chenu K, van Oosterom E, Snow V, Murphy C, Moore AD, Brown H, Whish JPM, Verrall S, Fainges J, Bell LW, Peake AS, Poulton PL, Hochman Z, Thorburn PJ, Gaydon DS, Dalgliesh NP, Rodriguez D, Cox H, Chapman S, Doherty A, Teixeira E, Sharp J, Cichota R, Vogeler I, Li FY, Wang E, Hammer GL, Robertson MJ, Dimes J, Carberry PS, Hargreaves JNG, MacLeod N, McDonald C, Harsdorf J, Wedgwood S, Keating BA (2014) APSIM—Evolution towards new generation of agricultural systems simulation. Environmental Modelling & Software 62, 327–350.
| APSIM—Evolution towards new generation of agricultural systems simulation.CrossRef |
Howden SM, Gifford RG, Meinke H (2010) Grains. In ‘Adapting agriculture to climate change’. (Eds C Stokes, M Howden) pp. 21–48. (CSIRO Publishing: Melbourne)
Kirono D (2010) Climate change in Timor-Leste—a brief overview on future climate projections. CSIRO National Research Flagships, Aspendale, Victoria.
Molyneux N, Rangel da Cruz G, Williams RL, Andersen R, Turner NC (2012) Climate change and population growth in Timor-Leste: implications for food security. Ambio 41, 823–840.
| Climate change and population growth in Timor-Leste: implications for food security.CrossRef | 22569843PubMed |
Muchow RC, Sinclair TR, Bennet JM (1990) Temperature and solar radiation effects on potential maize yield across locations. Agronomy Journal 82, 338–343.
| Temperature and solar radiation effects on potential maize yield across locations.CrossRef |
Müller C, Bondeau A, Popp A, Waha K, Fader M (2009) Climate change impacts on agricultural yields. Background note for the World Development Report 2010 (World Bank, 2009).
Roudier P, Sultan B, Quirion P, Berg A (2011) The impact of future climate change on West Africa crop yields: What does the recent literature say? Global Environmental Change 21, 1073–1083.
| The impact of future climate change on West Africa crop yields: What does the recent literature say?CrossRef |
Sinclair TR, Muchow RC (1995) Effect of nitrogen supply on maize yield: I. Modelling physiological responses. Agronomy Journal 87, 632–641.
| Effect of nitrogen supply on maize yield: I. Modelling physiological responses.CrossRef |
Turner NC, Meyer R (2011) Synthesis of regional impacts and global agricultural adjustments. In ‘Crop adaptation to climate change’. (Eds SS Yadav, RJ Redden, JL Hatfield, H Lotze-Campen, AE Hall) pp. 156–165. (Wiley/Blackwell: Chichester, UK)
Turner NC, Rao KPC (2013) Simulation analysis of factors affecting sorghum yield at selected sites in eastern and southern Africa, with emphasis on increasing temperatures. Agricultural Systems 121, 53–62.
| Simulation analysis of factors affecting sorghum yield at selected sites in eastern and southern Africa, with emphasis on increasing temperatures.CrossRef |
Turner NC, Molyneux N, Yang S, Xiong Y, Siddique KHM (2011) Climate change in south-west Australia and north-west China: Challenges and opportunities for crop production. Crop & Pasture Science 62, 445–456.
| Climate change in south-west Australia and north-west China: Challenges and opportunities for crop production.CrossRef |
Walkley A, Black IA (1934) An examination of the Degtjareffe method for determining soil organic matter, and a proposed modification of the chromic acid titration method. Soil Science 37, 29–38.
| An examination of the Degtjareffe method for determining soil organic matter, and a proposed modification of the chromic acid titration method.CrossRef | 1:CAS:528:DyaA2cXitlGmug%3D%3D&md5=e7a77f61db5794517104db09478fa1dcCAS |
Williams R, Borges LF, Lacoste M, Andersen R, Nesbitt H, Johansen C (2012) On-farm evaluation of introduced maize varieties and their yield determining factors in East Timor. Field Crops Research 137, 170–177.
| On-farm evaluation of introduced maize varieties and their yield determining factors in East Timor.CrossRef |
World Bank (2010) World Development Report 2010—Development and Climate Change. The World Bank, Washington, DC.