Arid and semiarid areas are main areas of food production in our country.Water shortage and nutrient deficiency are two key factors that restricted crop production in these areas. 干旱和半干旱地區是我國重要的農業(yè)生產(chǎn)區，水分不足和養分缺乏是制約其生產(chǎn)發(fā)展的兩個(gè)關(guān)鍵因素。
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