The doping ions with various valences were selected to verify the charge compensation effect on the luminescence intensity as K and al seem to have similar charge compensation effect.
选择不同价态补偿离子掺杂是为了研究电荷补偿作用机制对该类材料发光性能的作用。
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。
Then a pod experiment is conducted with two K levels to evaluate the difference of the main morphological and physiological indexes of each typical variety selected from those four types.
再从上述四种类型中分别选取各类型代表品种（系）进行盆栽试验，对植株的主要形态指标以及生理生化指标进行测定，分析不同耐性品种（系）在形态、生理生化方面的差异。
Then a pod experiment is conducted with two K levels to evaluate the difference of the main morphological and physiological indexes of each typical variety selected from those four types.
再从上述四种类型中分别选取各类型代表品种（系）进行盆栽试验，对植株的主要形态指标以及生理生化指标进行测定，分析不同耐性品种（系）在形态、生理生化方面的差异。
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