Preliminary Study on Variability of Soil Nutrients and the Recommendation of Fertilization

244 soil samples were collected by grid sampling(100m×100m) using globle position system(GPS) in the Zhongxing village of Shuangcheng city of Heilongjiang province. The result indicated that the variance of the soil nutrients had existed in the field. Based on the sampling distribution, the nutrients tested were divided into two classes. One was called declining nutrients, such as nitrogen, phosphorus and sulfur, etc. The other was called non-declining nutrients, such as potassium, manganese, copper and calcium, etc. The main reason of declining was caused by supplying of chemical fertilizers. For the field with long history and large amount nutrients applyed, the fertilization recommendation must be based on the spatial variability of soil nutrients, the others can be on the average values of the soil test in the field.