CSEM 240 Lecture 10: Soil Science Exam 1 Study Guide
31 Dec 2016
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<25% of the total land area is suitable for crop production. Existing land resource is being depleted by population growth and (cid:498)development(cid:499) Medium for plant growth supports diverse ecosystems and returning co2 to the atmosphere for reuse in photosynthesis. Soils have the ability to assimilate great quantities of organic matter, turning it into humus. The nobel prize in physiology or medicine 1952. Of the 92 naturally occurring chemical elements, 17 have been shown to essential elements, meaning that plants cannot grow and complete their life cycles without them. Most of the water in our rivers, lakes, estuaries, and aquifers has either traveled through the soil or flowed over its surface. Some of the water may be stored in the soil and used by the trees and other plants. Some water may seep slowly down through the soil layers to the groundwater, eventually entering the river over a period of months or years as base flow.
