We carried out a dietary investigation of pupils aged 10-11 in Mei county in Shaanxi with level-based community random sample method.
本文采用分层整群随机抽样的方法，调查了陕西省眉县农村10 ~ 11岁小学生的膳食摄入情况。
In order to study the relationship between yield, maize ear treats and organ matter, N-OH, available P and K, we selected field block with different soil nutrition in Mei county, Shaanxi province.
在陕西眉县选择农田土壤养分含量不同的地块，研究不同含量的有机质，碱解氮、速效磷、速效钾与玉米果穗穗部性状及产量的关系。
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