Study On Change Characteristics Of Soil PH And Main Nutrients In Cultivated Land In Fuqing City

In order to understand and grasp the changes of cultivated soil p H and main nutrients?alkaline nitrogen,available phosphorus,available potassium,and organic matter?in Fuqing City in the past 30 years,better provide guidance and suggestions for agricultural production and fertility cultivation Carrying out soil testing and formula fertilization projects,based on the collection and testing of 300 soil samples in 2016,conducted in-depth research on the soil p H and main nutrients of cultivated land in Fuqing City in 1983,2005and 2016,and analyzed Fuqing City through comparative analysis Variation characteristics of soil p H and main nutrients in cultivated land.The results showed that the average p H value of cultivated soil in Fuqing City in 2016 was 6.02,which was slightly acidic.The average value of soil alkaline nitrogen content was 110.52 mg.kg^-1,which was at a medium level.The average value of soil available phosphorus content was 35.62 mg.kg^-1.It is at a rich level;the average value of soil available potassium content is 60.38 mg.kg^-1,which is at a deficiency level;the average value of soil organic matter content is 16.35 g.kg^-1,which is at a moderate level.Over the past three decades,the p H value of cultivated soil in Fuqing City has increased first and then decreased slightly.The average p H value of the soil testing and fertilization project in 2005 was0.98%higher than that of the second soil census.The p H value measured in 2016 Compared with the value measured in 2005,the average value decreased by 2%;compared with the value of the second soil census,the value of alkali-decomposed nitrogen measured by the soil fertilization project in 2005 increased significantly,and the average content increased by 15.09 mg.kg^-1,an increase of 16.29%,compared with the value measured in 2005,the level of alkali-decomposed nitrogen has increased,and the average content has increased by 2.8 mg.kg^-1,an increase of 2.6%;measured in 2005 Compared with the value of the second soil census,the value of available phosphorus measured in the soil formula fertilization project increased significantly,and the average content increased by17.42 mg.kg^-1,an increase of 103%.The value measured in 2016compared with the value measured in 2005,The level of available phosphorus has increased,the average content has increased by 1.3mg.kg^-1,an increase of 3.78%;the value of quick-acting potassium measured by the soil testing formula fertilization project in 2005 has decreased compared with the value of the second soil census,The average content decreased by 17.74 mg.kg^-1,a decrease of 20.62%,compared with the value measured in 2005,the level of available potassium has decreased,the average content has dropped by 7.98 mg.kg^-1,a decrease of11.54%;the organic matter determined by the soil testing and fertilization project in 2005 Compared with the value of the second soil census,the average value decreased by 1.15 g.kg^-1,a decrease of 6.8%.Compared with the value measured in 2005,the level of organic matter increased in2016,The average content increased by 0.6 g.kg^-1,an increase of 3.81%.According to the evolution of soil p H and main nutrients in Fuqing City,combined with Fuqing Soil and Fertilizer Station's business technology promotion work in recent years,soil improvement measures were proposed according to local conditions,which provided a strong scientific basis for the rational use of cultivated soil in Fuqing City and sustainable development of agriculture.