BIOL 1202 Chapter : CH 37
Document Summary
4/8/2014 4:19:00 pm: soil is the place where much of the plant nutrients occur. Soil is made up of particles derived from the breakdown of rocks (minerals) along with organic material (humus). Two aspects of soil the texture and composition are important for plant growth: texture is the relative amounts of various sizes of soil particles, composition is relative amounts of inorganic and organic components. Some of the nutrients are needed in large quantities (>1% of the plant"s dry weight). Another group of nutrients is only needed in small amounts (<1% of the plant"s dry weight). These are the micronutrients: cl, mn, mo, cu, b, z. ni. Only two of these macro/micronutrients come from the air the remainders are obtained from the soil. This doesn"t mean the plants don"t grow, it means that growth is limited by the supply of these nutrients (see fig 37. 8). Most typical fertilizers supply n, p, and k.
