- The prevention and suggestion is brought up it is important for a good drain system for preventing soil secondary salinization it can lowerer the underground water lever and ejecter the soil salt in order to adapt to douche and drain.
- In order to provide the foundation for the policies to be usefully put in practice taking yangou basin as a case study and using day-by-day meteorological data of yanan station in1997to2002 it simulated and analyzed the quantitative relation between soil and water loss and topographic condition by the aid of win-yield software.
- The party secretary of the county began to pore on the problem of soil improvement.
- Surcharge-a load used to model the weight of earth fill or other loads applied to the top of the retained material.
- One occupies relatively dry sandy loam soils.
- Some soils are affected by salinity-alkalinity: about15% of irrigated area suffer from varying degrees of salinity and sodicity and about10% from water logging.
- According to importance of ecosystem services the function of fixing carbon and releasing oxygen is the most important the function of conditioning climate is the second and the functions of keeping waterhead preserving soil purifying environment and restraining noises are also important.
- Pot experiments using barley and ryegrass on12soils with different textures organic matter total nitrogen contents and c: n ratios were conducted and mineralized and mineralizible nitrogen in soils were determined by different methods in order to investigate the relationship between nitrogen uptake by plants and nitrogen in soils determined.
- The initial aspergillus niger separated form soil was mutated by uv and des and by this a strain as35was obtained which could use corn powder as raw material.the result of fermentation in flask showed that the strain could use corn powder to produce citric acid effectively with8.6% acid producing capacity and66.2% transmission percentage of raw material which is better than those of initial aspergillus niger.this is helpful to the further optimization of fermentation medium.
- And along entire outside perimeter from grade to bottom of footing avoid soil washout around footings.
- Little change in hydrogen and oxygen isotopic composition of rivulet before and after921earthquake in paikangchi and nankangchi river basin implied that the earthquake stress might just force the groundwater stored in soil or strata to flow out but did not change the water sources of the two basins.
- Compared with the ecomat-uncovered soil ecomat could increase the soil temperature and play a temperature-keeping role during november to next february when the atmosphere temperature is very low.
- The gardener raked the soil smooth for a seedbed.
- Experts say warm days cool nights and a medium soil temperature are the best conditions for growing carrots that taste great.
- Taking part in the ten-year programme for reduction in hazards in leshan the au-thor has investigated such geological hazards as rock fall landslide debris flow salinization and swamping of soil surface subsidence and so forth.