Congratulation Mr. Presedent Barak Obama and we hope that you be a leader for the peace in The Middle East
2. Organic Components 2.1 Types of Organic Compounds 2.1.1. Non-humic substances 2.1.2. Humic substances 2. Soil organic components 2.1. Types of organic compounds Soil organic matter (SOM) can be of plant, animal, or microbial origin and may be relatively fresh or highly decomposed and transformed. In this course, terms “soil organic matter” and “humus” are considered synonyms. One of many definitions of soil organic matter states that “it is a complex and rather resistant mixture of brown or dark brown amorphous and colloidal organic compounds that result from microbial decomposition and synthesis and has chemical and physical properties of great significance to soils and plants”. Many species of fungi and bacteria soil particles decompose soil organic matter. The fungi and bacteria that can break down the woody tissues and cellulose of intact leaves, stems and dead roots of plants perform the function of decomposition of organic matter that often builds humus and returns nutrient back to the soil. When the species that are capable of decomposition are lacking, leaves and other organic matter remain intact and the food energy they contain are not released to drive the foodweb
