Analysis Of Soil Fertility And Alinization Type Of Desert Transition Zone Land And Construction Corps In He Tian Area

?Objective?In order to solve those problems of ambiguous soil fertility and properties and farmland soil obstacles in agricultural production,the soil organic matter,nitrogen,phosphorus,potassium,salinity and p H of the cultivated layer in the 47th regiment were analyzed and evaluated,and suggestions and measures were put forward for the improvement and management of the cultivated land in the 47th regiment.?Method?Based on the land use map of the 47th regiment,soil and water samples were collected and measured by the sampling unit.Farmland soil nutrient classification and fertility evaluation were carried out by using GIS technology and statistical analysis,and the soil salinity of typical farmland was analyzed and evaluated.?Results?(1)The average content of available N in the whole soil was 42.26 mg/kg,the standard deviation was 23.47;the content of available N in 10.04%soil was less than 16 mg/kg,which belongs to the extremely low soil fertility level;44.77%of the soil soil available N content was16-40 mg/kg,which belongs to the low soil fertility level;40.12%of the soil available N content was between 40-90mg/kg,which belongs to the medium soil fertility level;and 5.02%of the soil available N content was more than 90 mg/kg,which reaches the high soil fertility level.(2)The average content of soil available P was 21.72mg/kg,the standard deviation is 19.73;28.03%of the soil available P content was less than7 mg/kg,which belonged to the very low soil fertility level;20.08%of the soil available P content was between 7-13 mg/kg,which belonged to the low soil fertility level;23.85%of the soil available P content was between 13-30 mg/kg,which belonged to the medium soil fertility level;28.03%of the soil available P content was more than 30 mg/kg,which reached the high soil fertility level.(3)The average content of soil available K was 20.1 mg/kg,the standard deviation is 63.59;0.84%of the soil available K content was less than 80 mg/kg,which belonged to the very low soil fertility level;21.34%of the soil available K content was among 80-160 mg/kg,which belonged to the low soil fertility level;28.03%of the soil available K content was among 160-210 mg/kg,which belonged to the medium soil fertility level;49.79%of the soil available K content was more than 210 mg/kg,which reached the high soil fertility level.(4)The average content of SOM was 4.13,and the standard deviation was 1.89;100%soil SOM was less than 12 mg/kg,which belonged to the very low level of soil fertility.(5)The average soil p H in the whole regiment was 8.70,and the standard deviation was 0.45;22.59%of the soil p H was greater than 9.0,and the soil was in moderate and intensive alkalization;41.84%of the farmland soil p H was among 8.5-9.0,and the soil was in mild alkalization.(6)The salinity of irrigation water is low,but the salinity of drainage ditch and drainage pit is high.The content of Na⁺,Cl^-,Ca²⁺,Mg²⁺is high.The typical secondary salinization cultivated laye is dominated by sodium sulfate type,sodium chloride type and chloride type,and a small number of Apple fields,Liulian and Qilian jujube fields are dominated by calcium chloride type.?Conclusion?SOM content in the whole regiment was extremely low,about 50%of farmland soil available N and available P were low or extremely low,and 22.1%of farmland soil available K was low or extremely low.The soil salinization of the militia company and most of the wasteland in the cultivated agricultural production units were more serious than that of other companies,and two thirds of the farmland soil in the regiment was slightly alkaline.Magnesium chloride was the main basic ion in irrigation water,magnesium sulfate and sodium chloride were the main basic ion in drainage canal,and calcium chloride and sodium chloride were the main basic ion in drainage pit.Irrigation water quality was harmful to crops,which was the main cause of regional farmland secondary salinization.The farmland improvement and soil fertility improvement of the 47th regiment should be mainly based on the years of cultivated land reclamation,combined with soil fertility,crop planting types and farmland water conservancy projects.