Experiment from 2009 to 2010 was conducted to study the effects of soil amendment fertilizer on yields of winter wheat and NEP of farmland.The results are as follow: As irrigation was improved,the optimum amount of SAF fertilization was raised correspondingly;the maximum yield was 8 894.11 kg/ha under the treatment of irrigation at 60 mm in jointing stage and fertilized soil amendment fertilizer at 1 350 kg/ha.Based on output-input ratio,the optimum amount of SAF fertilization under no irrigation,irrigation...
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