Application of Soil Fertilizer Tester in Balanced Fertilization of Sweet Potato Planting

Sweet potato is a kind of economic crop. It is also a major food crop in Fuding City. The planting area is very wide. In order to promote the high yield and stable production of sweet potato, it is necessary to scientifically and reasonably apply fertilizer to explore the effects of different application rates of nitrogen, phosphorus, and potassium and sweet potato yield, so as to determine the highest fertilization amount and determine the optimum amount of fertilizer. In order to provide the basis for the soil testing formula, a soil fertiliser detector is required to measure soil nutrients.

Before transplanting, soil samples were taken for physicochemical characterization. Potentiometric method was used to measure soil pH value; Alkaline solution method was used to measure alkali-hydrolyzed nitrogen; Sodium bicarbonate was leached out, molybdenum-antimony was used as colorimetric method to measure available phosphorus; Ammonium acetate was extracted, and flame photometer was used to determine available potassium, and potassium dichromate was used to determine organic matter. The data analysis was conducted using soil testing and fertilization 3414 field design and data analysis management system, or directly using soil fertilizer detectors for analysis. Then fertilize the soil and get the best fertilization.

Through the determination and analysis of the results of the soil fertilizer tester, it was shown that the effect of the N cable on the Gan department was ten PK. When the application rate of N fertilizer is above 12kg/667m2, appropriate application of PK fertilizer, especially the increase of K fertilizer supply in long-potato stage, can effectively promote the growth and development of sweet potato. Under the experimental conditions, the best N application rate of sweet potato was 9.18-13.58kg/667m2, with an average of 11.38kg/667m2; the optimum P application amount was 3.38-3.74kg/667mz, with an average of 3.56kg/667mz; The amount of K is 14.56 to 17.48kg/667mz, with an average of 16.02kg/667m2. The optimum ratio of application rate is N:P:K=1:0.25--0.41:1.07-1.90. The best economic yield is 1126.46-}-1342.26kg/667mz, with an average of 1234.36kg/667m2.

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