Effects Of HA?ATP And CMC On Water And Soil Nutrients Loss And Soybean Growth Traits On Loss Slope Land

The phenomenon of soil erosion on loess slopes is very serious.In this paper,an artificial rainfall experiment was conducted on the Wangdonggou slopes in Changwu County to study the effect of adding different humic acids(HA)on the slope erosion and bromide ion loss on bare ground.The effects of adding attapulgite(ATP)and sodium carboxymethyl cellulose(CMC)on slope soil and water nutrient loss,soybean growth and soil physicochemical properties in slope farmland were studied.The results of the study were to reduce water and soil nutrient loss on loess hillslopes.And crop growth has practical significance.The main research findings are as follows:(1)Under different humic acid application(bare land)conditions,runoff and sediment amount on the slope decreased with increasing humic acid content.Compared with the blank group,the applied humic acid was significantly reduced.(p<0.05)The slope runoff Br-1 concentration and loss amount,infiltration rate S value increase with the increase of humic acid content,and the cumulative infiltration amount on the slope increases accordingly;for three humic acids The optimum dosage is 60g/m2 for natural humic acid,and the best results are obtained when the concentration of humic acid and biochemical fulvic acid is 0.05%.Compared with natural humic acids that are insoluble in water,the ore source fulvic acid and biochemical fulvic acid are more effective,the runoff rate is reduced by 20.1%and 33.1%,respectively,and the amount of sediment is reduced by 8.45%and 16.3%.(2)Adding ATP and CMC to soil in slope-cultivated soybean land has a significant effect on reducing slope erosion and preventing soil nutrient loss.The addition of ATP and CMC can significantly prolong the runoff time of slope soil and reduce runoff and total sediment volume.With the increase of ATP content,the slope runoff rate and cumulative sediment production flow are reduced.The CMC can effectively reduce the cumulative sediment production on the slope,and increase the soil input at low levels(0-68 g/m2).Permeability,at high levels(102-170 g/m2),increased runoff and cumulative runoff.The power function can be used to better fit the cumulative flow rate and accumulated sediment production over time on the slope.Compared with the blank group,both ATP and CMC test groups can significantly reduce the concentration of ammonium nitrogen in the slope runoff(p<0.05).There was no significant difference(p>0.05)for nitrate nitrogen even if ATP and CMC were added.The concentration of water-soluble phosphorus in runoff was less than the concentration of nitrate in runoff.The concentration of water-soluble phosphorus in runoff decreased with the increase of ATP content,and the change rule of water-soluble phosphorus concentration in the CMC test group and the blank group had no Significant changes(p>0.05).(3)Under ploughing soybeans,adding ATP and CMC to the soil had little effect on the soil bulk density,but high levels(102-170 g/m2)of ATP and CMC increased soil bulk density to a certain extent,impeding The deep water seepage has increased the water storage capacity of the soil.Soaking in water,erosion is not easy to disintegrate,weakening the ability of water to damage the soil structure.Compared with the blank group,ATP and CMC have a certain role in promoting the growth of soybean,and CMC can promote crop growth better than ATP.Applying ATP and CMC in soybean farmland can effectively maintain the nutrient content in the soil surface profile and control the deep leaching of nutrients.When the content of ATP and CMC is large,the soil's ability to adsorb nutrients is stronger,thus increasing the absorption and utilization of nutrients by soybean.Compared with CMC,ATP can better reduce slope soil erosion,while CMC can better reduce slope nutrient loss and promote soybean growth and development.