某田块春季播种的冬小麦只长苗而不结实，可能的原因是：

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31366' and id < 2515584 and id<>'2515584' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31366' and id > 2515584 and id<>'2515584' order by id asc limit 5