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土壤养分元素的测定是推荐施肥的基础.在整个土壤测定过程中,来源于土壤样品本身的误差,要占到总误差的80～85%,其余15～20%是由实验室再次取样和分析本身所造成的.一般说来,在良好的实验指导下,分析本身的误差是不明显的.因此,为了有效地降低测试误差,必需采用合理的取样方法.供测土壤样本的采集,一般都是采用多点采集、均匀混合的混合样,这样一种样品,是建立在同一农田中养分浓度分布为正态分布的基础之上的,但是农田土壤中,养分浓度的分布,并不完全是正态型的.许多研究者从大范围的水平分布上,对不同养分元素的分布型态进行了研究指出,一些元素属于偏态或对数正态分布,而对于制订合理取样技术的基础,即同一农田中养分浓度的分布型态,则研究较少.作者在研究平原地区稻田土壤供养分分析用的土样采取方法时,曾对此进行了初步探讨,指出了某些
The determination of soil nutrient elements is the basis for recommended fertilization.In the entire soil determination process, the error from the soil sample itself accounts for 80-85% of the total error and the remaining 15-20% is sampled and analyzed again by the laboratory Itself caused by.In general, under the guidance of a good experiment, the analysis of the error is not obvious.Therefore, in order to effectively reduce the test error, it is necessary to adopt a reasonable sampling method for the measurement of soil samples collected, generally Is a mixed sample of multi-point collection and uniform mixing. Such a sample is based on the distribution of nutrient concentration in the same farmland as a normal distribution. However, the distribution of nutrient concentration in farmland soil is not completely Normal type.Many researchers from a wide range of horizontal distribution, the distribution of different nutrient elements were studied that some of the elements are skewed or lognormal distribution, and for the development of rational sampling techniques based, That is, the distribution pattern of nutrient concentration in the same farmland, less research is carried out.The author had a preliminary study on the method of taking soil samples for analysis of paddy soil nutrient supply in plain areas, referring to Some