Kyrgyz officials calculated the rent based on the amount of wheat the land could produce.

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But according to this research, wheat will face a difficult future in the developing world, where higher prices for cotton, maize and soybeans have pushed wheat to marginal land, making it more vulnerable to stresses induced by climate change.

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He was born into farming, and on that land he's raised wheat, barley and a family.

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Matters aren't helped, he says, by the loss of village grazing land to new, agricultural projects for growing wheat and watermelons.

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Crops, such as wheat, corn, and especially soy, have come to occupy land that was once destined to cattle grazing.

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In 1973 he bought an abandoned monastery on 480 acres of untouched mountaintop land overlooking the Adriatic Sea and planted a crop of organic durum wheat.

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About 250km (150 miles) to the north, in neighbouring Shanxi province, in Pingdong, a much poorer village, 250 people live along battered dirt roads, and try to grow wheat, corn, soyabeans and winter melon on the dry, rocky mountain land.

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Since the black wheat can be cultivated between regular rice harvests, it helps the farmers use their land better.

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Recently vast tracts of productive land has been out of commission as floods hit farmland Australia, which exports its wheat and sugar cane around the world.

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