<P> The importance of a crop varies greatly by region . Globally, the following crops contribute most to human food supply (values of kcal / person / day for 2013 given in parentheses): Rice (541 kcal), wheat (527 kcal), sugarcane and other sugar crops (200 kcal), maize (corn) (147 kcal), soybean oil (82 kcal), other vegetables (74 kcal), potatoes (64 kcal), palm oil (52 kcal), cassava (37 kcal), legume pulses (37 kcal), sunflowerseed oil (35 kcal), rape and mustard oil (34 kcal), other fruits, (31 kcal), sorghum (28 kcal), millet (27 kcal), groundnuts (25 kcal), beans (23 kcal), sweet potatoes (22 kcal), bananas (21 kcal), various nuts (16 kcal), soyabeans (14 kcal), cottonseed oil (13 kcal), groundnut oil (13 kcal), yams (13 kcal). Note that many of the globally apparently minor crops are regionally very important . For example in Africa, roots & tubers dominate with 421 kcal / person / day, and sorghum and millet contribute 135 kcal and 90 kcal, respectively . </P> <P> In terms of produced weight, the following crops are the most important ones (global production in thousand metric tonnes): </P> <Table> <Tr> <Th> Crop </Th> <Th> 2000 </Th> <Th> 2013 </Th> </Tr> <Tr> <Th> Sugarcane </Th> <Td> 1,256,380 </Td> <Td> 1,877,110 </Td> </Tr> <Tr> <Th> Maize </Th> <Td> 592,479 </Td> <Td> 1,016,740 </Td> </Tr> <Tr> <Th> Rice (paddy) </Th> <Td> 599,355 </Td> <Td> 745,710 </Td> </Tr> <Tr> <Th> Wheat </Th> <Td> 585,691 </Td> <Td> 713,183 </Td> </Tr> <Tr> <Th> Potatoes </Th> <Td> 327,600 </Td> <Td> 368,096 </Td> </Tr> </Table> <Tr> <Th> Crop </Th> <Th> 2000 </Th> <Th> 2013 </Th> </Tr>

Find and write some information about farming of various crops