潮土各亚类速效钾含量显著。潮土亚类含量最高，平均为78.80mg/kg

The content of available potassium in subgroups of Chao soil is significant. The subgroup content of the Chao soil is the highest, with an average of 78.80mg/kg, and the salinized Chao soil is the lowest, with an average of 66.67mg/kg. The content of available potassium in each subtype of Chao soil from high to low is as follows: Chao soil>Saline Chao soil. <br>2) Soil available potassium content in different land types: The available potassium content in the topsoil is greatly affected by human activities, and the difference between different cultivated crops is significant. Apples and vegetables have high economic value and are the main source of income for farmers. The amount of fertilizer input is large. Therefore, the available potassium content in the orchard and vegetable fields is higher, and the highest available potassium content in the orchards is at an average content of 101.86mg/kg, varying from 25 to 395mg/kg; followed by vegetable fields, the average content is 101.53mg/kg, varying 40~265mg/kg; the lowest available potassium content in grain field, the average content is 78.23mg/kg

The rapid-acting potassium content of the subtypes of tidal soil was significant. Tidal sub-species content is the highest, with an average of 78.80 mg/kg, and the lowest salted moisture content, with an average of 66.67 mg/kg. The content of quick-acting potassium in the subcategories of tidal soil is from high to low in order: tidal soil and salinized tide soil.<br>2) Soil quick-acting potassium content of different land types: The content of quick-acting potassium in tillage soil has a great influence on man-made activities, and the differences between different cultivated crops are significant. The high economic value of apples and vegetables is a major source of income for farmers, and fertilizer inputs are high. Therefore, the soil quick-acting potassium content of orchards and vegetable fields are higher, the orchard quick-acting potassium content is highest, the average content is 101.86mg/kg, the change rate is 25 to 395mg/kg, followed by vegetable land, the average content is 101.53mg/kg, the change rate is 40 to 265mg/kg;

The content of available potassium in each subspecies of fluvo aquic soil was significant. The content of sub types of fluvo aquic soil was the highest, with an average of 78.80 mg / kg, while that of saline soil was the lowest, with an average of 66.67 mg / kg. The results showed that the content of available potassium in different types of fluvo aquic soil from high to low was as follows: fluvo aquic soil > salinized fluvo aquic soil.<br>2) The content of soil available potassium in different land use types: the content of soil available potassium in plough layer is greatly affected by human activities, and the difference between different cultivated crops is significant. Apples and vegetables are of high economic value, which are the main income source of farmers, and the input of chemical fertilizer is large. Therefore, the content of available potassium in orchard and vegetable soil was higher, the highest in orchard, with an average content of 101.86mg/kg, ranging from 25 to 395mg / kg; the second was vegetable field, with an average content of 101.53mg/kg, with a range of 40-265mg / kg; the content of available potassium in grain field was the lowest, with an average content of 78.23mg/kg<br>