Effects Of Different Crop Straw On Soil Acidification Changes

In people’s universal attention of global change, environmental problems such as soil acidification,the straw returned to soil acidity is more important and urgent.In view of common soybean in Northeast China, 3 crops of peanuts and corn stalk and leaf parts added to the soil on the soil pH and exchangeable acid and other chemical properties change as the main research, discusses the relationship between soil acidity and add different crop straw. This test to Jilin agricultural University plots soil for try soil, for 6 months of training experiment, will not added crop straw soil sample as control processing, for added different crop straw, and different volume of conditions soil pH, and Exchange sex acid, Exchange performance, acidification rate, indicators for correlation, on different crop straw on soil pH value of effects for has discussion, obtained following conclusions:(1) In the process of cultivation, control soil pH showed a trend of gradually reduce;Adding different amount of 3 kinds of crops straw stalk and blade showed a trend of rise after the first reduce the soil pH, soil pH building the second month all reached maximum, at the end of the training, compared different crops in different adding amount, not with the increase of adding amount and presents a regular change, adding soybean straw20g/kg compared to control(5.04) increased by 0.97, increase of maximum; Compared to the same crop straw stalk and blade, straw to soil pH effects better.(2) Adding 3 kinds of stalk and blade soil exchangeable acid, the content of exchangeable AL3+ were lower than controls, but no significant influence on commutativity H+.At the end of the training, the addition ratio of different crops, not with the increase of adding amount and presents a regular change, adding soybean straw 20g/kg of exchangeable acid significantly lower than the contrast, compared with the control(0.58 cmol / kg) reduced 0.37 cmol / kg;Add corn stalk and blade 10 g/kg, and 15 g/kg and the amount of 20 g/kg of exchangeable acid is higher than add 5 g/kg, compared to the same crop straw stalk and blade, straw to reduce commutativity acid, the exchange of sexual AL3+ effect is better.Compared the different crops straw, soybean straw for the exchange of sexual acid to reduce the best effect, peanut straw.(3) Adding 3 kinds of crop straw and the soil organic matter content of leaves at the end of the training were significantly higher than that of control, compared with the control group(13.79 g/kg) increase rate is above 14.97 g/kg, shows that adding different crops straw stalk and blade can increase soil organic matter, including adding soybean leaves increase the effect of organic is best.(4) Adding three kinds of crops straw stalk and blade exchange of soil properties were improved, can obviously increase the amount of exchangeable base ion in soil.Through the content and significance analysis, adding soybean straw 20 g/kg on the properties of soil exchange promotion effect is most obvious.Correlation analysis showed that after adding three kinds of crops straw stalk and blade soil pH, base saturation, cation exchange capacity, exchangeable calcium were increased, the change of soil pH and salt base saturation, cation exchange capacity, exchangeable calcium were positively correlated, and is not related with soil organic matter content.(5) Adding three kinds of crops straw stalk and blade soil ph buffer capacity is significantly higher than control, all can increase soil ph buffer capacity.But, at the end of the training, adding soybean straw is the most significant effect of 20g/kg, is superior to add other crops straw stalk and blade soil.To sum up, adding different crop straw and blades can significantly improve the acidification of the soil, whether it’s straw or blade part into shi can effectively increase the soil pH, significantly reduced the soil exchangeable acid and commutativity AL3+ content. Add 3 kinds of crops straw stalk and blade part can obviously increase the content of calcium ion in soil, the correlation analysis showed that the change of pH value, mainly attributed to the exchangeable calcium saturation change.Comprehensive showed that adding soybean straw 20 g/kg compared to other crop straw to soil pH promotion effect is more significant, exchange performance improvement effect is better, therefore, in agricultural crops straw returned, soybean straw returning to the preferred.