The assay use split plot design on two factors, including the date of seeding and density, to define the better density and most suitable date of seeding on sand Jerusalem artichoke.

本试验采用播期与栽培密度两因素的裂区设计，以确定沙地菊芋种植的较佳密度和适宜播期。

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Especially, by detailed investigation for Chinese cabbage, some results showed that the nitrate content was effected by different organ of the same breed and different seeding date.

特别是对白菜进行了详细调查，发现同一品种不同器官，不同播期都影响硝酸盐含量。

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Moreover, on the basis of experimental data, the statistical relations between parameters and temperature, seeding date etc. are developed.

同时还根据实验数据，确定参数与光、温等气象因素的统计关系。

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