The macromolecule polymers take effect on improving soil structure

increasing soil penetration and controlling runoff on slope.For the purpose of exploring late-model

efficient and low materials that are taken on controlling runoff for loess region

three polymers are picked out

which are polypropylene acid

polythene hydrin and urea-formaldehyde resin.The effect on soil physical properties by applying polymers of different consistencies on soil are probed into.The results indicate that(1) the content of waterstable dumpling is increased by 17.27%

the soil permeability by 41.81%

the content of containing water by 2.5～3.1 times than antitheses

and the soil destiny is decreased by 11.18% after by polymers treatments in the range of most suitable consistencies.These indexes have proved that the macromolecule polymers are good improvemental matter

especially the effect of polypropy lene acid on soil is very marked

(2) the most suitable consistencies of them were ascertained by analyzing synthetical effect treated on soil

which is 4.8%～6.0%

1.6%

10.0% separately.