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Effect of Straw Modified Material on Control of Potassium in the Sandy Soil

Author: ManHong
Tutor: WangDingYong
School: Southwestern University
Course: Environmental Science
Keywords: Straw improved materials Sandy soil Potassium
CLC: S156.5
Type: Master's thesis
Year: 2010
Downloads: 87
Quote: 1
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Abstract


Loose soil particles of sandy soil structure, weak water, Paul fertility is poor, and therefore low productivity. Potassium plays an important role in plant growth and the metabolism, but it is easily lost in the soil. This not only causes a lower utilization of potash, and also increase the cost of agricultural inputs. Therefore, the increase in the sandy soil K content, and enhance the sandy soil on potassium adsorption and fixed, thus to increase potash utilization reduce Potassium loss of important significance. In this study, straw biological pretreatment combined with bentonite, PAM made of straw improved materials, soil culture experiments, isothermal method to study the adsorption and desorption tests, leaching tests its sandy soil potassium regulation effect for the future straw application and promotion of improved materials provide a theoretical basis. The main conclusions are as follows: (1) straw improved materials can significantly increase the sandy soil available potassium content. Soil culture pre same administered amount With the PAM formulation increasing the content of available potassium content overall is reduced; soil culture late, and its variation is opposite. The soil culture 60 days after maximum most of the processing of straw incorporation of improved materials available potassium, The treatment available potassium than 60.59% -217.96% CK. In various soil culture period, the same application rate formula PAM content was not significantly impact on the sandy soil available potassium. The same formula as the application rate of increase in available potassium is a corresponding increase in the maximum application rate of processing content is the highest, and vice versa minimum. In four soil culture period, the application rate for the A3 when the average content of available potassium compared with A1 61.07% -78.88%. Each formula in various soil culture period, the highest available K content processing application rate for A3 (10g/kg). CK available potassium with the the soil culture time prolonged gradually reduced, and straw application of improved materials handling available potassium showed a decreasing trend after the first increase, but overall the increase. Application of straw improved materials processing available potassium soil culture 60 days compared with 10 days increased 6.32% -75.01%. (2) The straw improved materials can effectively improve the performance of the sandy soil of potassium adsorption. The same application rate also increases the overall average rate of adsorption with the increase in the content of the recipe PAM soil potassium. In various soil culture period, the average adsorption rate processing recipe for each application rate almost all F3 (900:100:30). Soil culture after 90 days, most of the maize straw into improved materials average absorption rate of soil potassium treatment T2, 3, T5, and T10, the average adsorption rate than CK respectively 10.32,14.67 and 15.28 percentage points . PAM applied to a significant increase in the sandy soil of potassium adsorption. The same formula as the overall average adsorption rate of increase in soil potassium application rate is increased. In various soil culture period, the average adsorption rate processing application rate almost each formula A3 (10 g / kg). In the the four soil culture period, the amount of application is the mean of the average absorption rate A3 is compared with A1 is improved 2.17-5.52 percent. A large amount of straw application and the bentonite can effectively improve the performance of the sandy soil of potassium adsorption. With the extension of the soil culture time, CK's average adsorption rate decreases, while the average adsorption rate of the processing of straw application modified material is showing a gradually increasing trend. The average absorption rate of the soil culture at 90 days of straw incorporation of improved materials processing than 10 days of 3.67-10.10%. Langmuir equation can well reflect the sandy soil of potassium adsorption reaction, the correlation coefficients are very significant level. Straw application of improved materials in various soil culture period, to a certain extent, can increase the maximum adsorption capacity of the soil potassium adsorption equilibrium constant and the maximum buffer capacity. (3) after application of straw improved materials sandy soil potassium desorption rate increase. Sandy soil potassium desorption rate variation of the average adsorption rate basically the same in the different treatments and time variation similar to the average adsorption rate. Soil culture after 90, the average desorption rate of each treatment than CK increased to 1.92-7.89 percent. In four soil culture period, the application rate of the A3 when the mean of the average desorption rate compared to A1 when increased 0.94-2.24%. Average desorption rate of soil culture at 90 days of straw incorporation of improved materials handling improved compared to 10:00 by 1.34-6.41 percentage points. (4) straw improved materials significantly inhibited the sandy soil potassium leaching. Increasing the content of potassium in the same application amount as PAM formulation the amount of leaching is reduced. Least the total amount of each application rate leaching processing formula F3 (900:100:30). Treatment T2, T5, and T10 leaching total than CK were reduced by 7.82%, 24.90% and 48.00%. The increase in the amount of potassium in the same formulation as the administering the amount of leaching is reduced. Least the total amount of each formula leaching processing application rate for A3 (10 g/1kg). Application rate is A3, the mean of the total amount of leaching compared to A1 when 28.52%. The straw application improved materials can effectively inhibit the vertical migration of the sandy soil potassium. For the upper soil, the treatment available potassium than CK increased 12.46% -102.30%; the lower soil treatment available potassium than CK reduced 7.51% -58.02%.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil improvement > Improvement of sand shortage
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