Study On The Law Of Water Leaching From Saline-alkali Land Enhanced By Ultrasonic Wave

Soil salinization in China is widely distributed,with many types and high salt content,and high salt content leads to many crops can not grow normally.Therefore,soil improvement has become an urgent problem to be solved in China's agricultural development.There are many researches on the enhancement of leaching of heavy metals from soil by ultrasonic wave,but there are few reports on the enhancement of water by ultrasonic wave on the leaching of salt from saline-alkali soil.This paper has carried out under the ultrasonic effect of moisture on saline soil salt-leaching,indoor soil column experiment was carried out,results were compared with traditional leaching salt,in four different soil column diameter,diameter of 10 cm respectively,15 cm,20 cm and 25 cm,processing,respectively D1,D2,D3,D4)under the content of the two parts of research,In the first part,the salt leaching test was carried out with the burying depth of a single vibrator of 5 cm,20 cm and 35 cm respectively(treatment numbers: M5,M20,M35)and different vibrator frequencies of 25 k Hz,28 k Hz and40 k Hz respectively(treatment numbers: H25,H28,H40).In the second part,multiple combinations of vibrators with the same frequency(1,2,3)were applied at different buried depths(with vertical distances of 5 cm and 20 cm,5 cm and 35 cm,20 cm and 35 cm,5 cm and 20 cm and 35 cm from the soil surface The results of the study on the leaching effect of saline-alkali soil under the combination of CK treatment numbers M5-20,M5-35,M20-35,M5-20-35)and different vibrator frequencies(treatment numbers H25,H28,H40,respectively)are as follows:(1)When the burying depth of ultrasonic single vibrator is 5 cm,20 cm,and 35 cm respectively,the burying depth of the vibrator is M5(5 cm)when the frequency of the vibrator is 40 k Hz under the soil column D1(diameter 10 cm).(2)Under the combined treatment of different vibrator frequencies and buried depths in soil column D1,different vibrator frequencies of 25 k Hz,28 k Hz and 40 k Hz acted on saline-alkali soil of the same depth,and the soil conductivity value under H25M5 treatment was 2.36 ms/cm,and that under H40M5 treatment was 2.53 ms /cm.Under the soil column diameter D4,the soil conductivity value is 2.29 ms /cm in the treatment of H25M35,2.53ms/cm in the treatment of H40M35,while the conductivity value of CK is 2.62 ms /cm in the control treatment,indicating that with the increase of vibrator frequency under different soil column diameters,Ultrasound enhanced the ability of water to remove soil salts.(3)H25M20-35 treatment is better when the two oscillators are buried differently;In the case of three oscillator treatments,the H25M5-20-35 treatment with oscillator frequency of25 k Hz is better.The conductivity of soil eluent increased with the increase of ultrasonic time.It decreases with the increase of frequency of ultrasonic oscillator and increases with the increase of number of ultrasonic oscillator.Compared with the control,ultrasonic treatment could significantly increase the leaching of soil salt.Under the conditions of ultrasonic vibrator generator duration of 15 min and ultrasonic power of 900 W,the experiment determined that the optimal treatment of soil salt leaching by ultrasonic wave was the vibrator frequency of 25 k Hz and the buried depth of the vibrator of 5cm,20 cm and 35 cm,that is,the optimal treatment combination of H25M5-20-35 treatment was the test.