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Rainfall-related opportunities, risks and constraints to rainfed cropping in the Central Dry Zone of Myanmar as defined by soil water balance modelling

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  • Cornish, Peter S.
  • Birchall, Craig
  • Herridge, David F.
  • Denton, Matthew D.
  • Guppy, Chris

Abstract

The Central Dry Zone in Myanmar is a major production area of rainfed pulses and sesame, grown in double-crop systems or intercropped with pigeon pea. Yields are generally low and variable. Water balance modelling in the Magway Region was used to identify opportunities for improvement. Annual rainfall from 1951 to 2016 was 754 mm (CV = 0.22), with 668 mm (CV = 0.26) in the growing season of 180 days (CV = 0.15). Variable rainfall and low soil water holding capacity lead to wide inter- and intra-annual fluctuation between water deficit and excess, with nutrient leaching expected from substantial deep percolation (61 mm yr−1). Despite variable rainfall, monsoon crops of 80–90 days duration had relatively stable ET (CV = 0.09) suggesting reliable potential yields, estimated to average 2.9 t ha−1 for groundnut. Reliable yields should also be achievable when this crop is intercropped with long duration (180 days) pigeon pea, a system that ensures income from the intercrop whilst having the capacity to adapt to variable post-monsoon conditions. The challenge with monsoon crops and pigeon pea is to effectively provide soluble nutrients (N, S) in a leaching environment, and P when surface soil is frequently dry. The post-monsoon crop in a double-crop system is risky, with variable ET (CV = 0.37) and yield potential. An option here is to vary inputs according to the potential, which is high with early sowing on a wet soil profile. Rainfall has declined since the 1950's, notably in June-July, but with no discernible effect on planting date or growing season length. There are now fewer but larger rainfall events, with implications for hydrology, agronomy and soil conservation.

Suggested Citation

  • Cornish, Peter S. & Birchall, Craig & Herridge, David F. & Denton, Matthew D. & Guppy, Chris, 2018. "Rainfall-related opportunities, risks and constraints to rainfed cropping in the Central Dry Zone of Myanmar as defined by soil water balance modelling," Agricultural Systems, Elsevier, vol. 164(C), pages 47-57.
  • Handle: RePEc:eee:agisys:v:164:y:2018:i:c:p:47-57
    DOI: 10.1016/j.agsy.2018.04.003
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    References listed on IDEAS

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    1. Cornish, Peter S. & Karmakar, Dinabandhu & Kumar, Ashok & Das, Sudipta & Croke, Barry, 2015. "Improving crop production for food security and improved livelihoods on the East India Plateau. I. Rainfall-related risks with rice and opportunities for improved cropping systems," Agricultural Systems, Elsevier, vol. 137(C), pages 166-179.
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    1. Boughton, Duncan & Goeb, Joseph & Lambrecht, Isabel & Headey, Derek & Takeshima, Hiroyuki & Mahrt, Kristi & Masias, Ian & Goudet, Sophie & Ragasa, Catherine & Maredia, Mywish K. & Minten, Bart & Diao,, 2021. "Impacts of COVID-19 on agricultural production and food systems in late transforming Southeast Asia: The case of Myanmar," Agricultural Systems, Elsevier, vol. 188(C).
    2. Herridge, David F. & Win, Mar Mar & Nwe, Khin Mar Mar & Kyu, Khin Lay & Win, Su Su & Shwe, Tun & Min, Yu Yu & Denton, Matthew D. & Cornish, Peter S., 2019. "The cropping systems of the Central Dry Zone of Myanmar: Productivity constraints and possible solutions," Agricultural Systems, Elsevier, vol. 169(C), pages 31-40.

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