Improving sustainable production of maize on upland soils of the Democratic People's Republic of Korea

Jeffrey Evans, J.N. Jo, Mark Conyers, Y.G. Mun, Philip Eberbach, S.S. Paek, Y.J. Ri, S.C. Tok Ko, Beverley Orchard, Y.A. Ryang, D.Y. Jong, T Kim, Edwin Wolfe

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Abstract

Maize production in the Democratic People's Republic of Korea is limited by soil infertility. Trials were established at two Co-operative Farms to quantify the yield response of maize to fertilizer and to vetch green manure. Crop land is precious so the vetch had to be integrated either by a short growth period prior to the crop in spring, or risking an autumn sowing for growth over winter. Maize grain yield was linearly related to the amount of vetch incorporated before maize at an annualised rate of 77 to 121 kg grain per fresh weight tonne of vetch manure. The N fertiliser substitution value was about 60 kg N ha-1 as urea. This response may be increased by adopting more cold-tolerant vetch (or alternative legumes), and safeguarding vetch from villager's livestock.
Original languageEnglish
Pages (from-to)404-422
Number of pages19
JournalAgroecology and Sustainable Food Systems
Volume36
Issue number4
DOIs
Publication statusPublished - Apr 2012

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