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agricultural irrigation(50)
irrigation(30)
agriculture(29)
climate change(25)
agricultural soil science(20)
cereal crops(17)
water resources(17)
land use(11)
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fertilizers(9)
irrigated agriculture(9)
maize(8)
surface water(8)
groundwater(6)
irrigation system(6)
rain(6)
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water management(6)
agricultural land(5)
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