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Effect of top-dressing on grain yield and quality of winter wheat
huang shao wen 1; jin ji yun 1; dong yue hou 2; he ping 1; xu heng yong 3; yang li ping 1 (1. soil and fertilizer institute; chinese academy of agricultural sciences; beijing100081; 2. agricultural technology extension center of qingzhou city of shandong province; qingzhou262500; 3. crop research institute; shandong academy of agricultural sciences; jinan250100)
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