Exam 6: Soil and the Hydrologic Cycle

Evapotranspiration includes vapor losses both from the soil surface and from the leaves of plants.

Which of the following would you expect to have the highest leaf area index?

Recent research with annual crops such as wheat,sunflower and sorghum in the Great Plains region suggests that,compared to continuous cropping,soil quality,crop productivity and farm profitability are likely to be greater when crops are grown in a field only every second year with the soil kept free of weeds in the non-crop year by repeated cultivation of herbicide application.

Plant transpiration efficiency at a given location is markedly influenced by _____.

Drainage pipe comes in 200 ft long rolls.The number of rolls needed to construct a uniform buried drainage system for a nearly level 20 hectare field will depend primarily on _____________.