One such practice might be the use of “fertilizer trees”. These are fast－growing trees and shrubs(矮树丛) whose leaves and roots help make soil richer.

　　Oluyede Ajayi，the leader author of the study，said “Basically these are trees that can fix nitrogen(氮) from the atmosphere and change them into nitrates(硝酸盐) for fertilizer，for organic fertilizer，for the soil.”

　　The farmers who planted fertilizer trees reported double the corn production of other farmers.In Zambia，the fertilized fields provided up to 114 additional days of food.Farmers say they need less rainwater if they use fertilizer trees.The trees reduce water runoff and soil erosion.

　　A recent study found that about 400,000 farmers in southern Africa are using them.The farmers themselves designed and managed part of the testing in the field，and spread the word of their successes.

　　Fertilizer trees can be used to increase food production

　　Problems ●World population growth 1.__________ the increase of world food production

　　●Large parts of global land 2.____________ by losses of soil quality and water resources，slowing production rates

　　●New agricultural technology is 3.____________ to land and water

　　4.______

　　______ Growing fertilizer trees to expand food production without 5.____________.

　　6.____________ of fertilizer trees ●Having leaves and roots 7.____________ soil

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