• Manage fields on site-specific basis, according to variable crop, soil and environmental conditions- often relies on intensive crop and soil testing. Soil reaction (Soil pH) Degree of acidity or alkalinity 7. • Organic matter in the soil is the remains of plant, dung or animal residues after partial decomposition.

• The various functions of soil organic matter are given in the text boxes, pointing to the soil section illustrating the respective aspect. 1. Soil fertility and soil quality defined a) Soil quality (see soils.usda.gov/sqi/) b) Soil quality indicators i. During the formation of soil organic matter, nutri-ents such as nitrogen (N), phosphorus (P), and sulfur (S) are incorporated into the soil structure, allowing the soil to act as a reservoir of these and other nutri-ents. The book accomplishes this by identifying a value of the energy in organic residues. Section 1, Biological Processes and Integration of Inorganic and Organic Fertilizers for Soil Fertility Improvement, examines biological processes that can enhance the soil fertility. Radiant Energy (Sunlight, quality, intensity & duration) 4. The book is divided into two sections. The rst part discusses the importance of organic residues to soil fertility and proposes an energy index for comparing organic and 2 Plant Nutrition and Soil Fertility by Clain Jones, MSU Extension Soil Fertility Specialist, and Kathrin Olson-Rutz, Research Associate, INTRODUCTION This module is the second in a series of Extension materials designed Soil fertility and crop production Soil fertility is a complex quality of soils that is closest to plant nutrient management. Applications of Soil Fertility Evaluation and Recommendation • Substitute information for resources. Gas content of the soil 6. Soil fertility refers to the ability of soil to sustain agricultural plant growth, i.e. Temperature, (Soil Temperature) 2. much can dramatically improve soil fertility. Accepts, holds, releases, and mineralizes nutrients and other chemical constituents ii.

Accepts, holds, and releases water to plants, streams, and groundwater iii.

The second message is to emphasize the need in the soil for energy required to maintain soil fertility. Moisture Supply (Ability to percolate and hold moisture in the soil) 3. It is of brownish-blackish colour and of crucial importance for soil fertility. Promotes good root growth and maintains good habitat for soil organisms For courses in Soil Fertility, Nutrient Management, and Plant Nutrition in Agriculture. The decomposition of soil organic matter releas- There are 16 essential elements that plants get from the soil, air and water. Soil Fertility and Fertilizers: An Introduction to Nutrient Management, Eighth Edition, provides a thorough understanding of the biological, chemical, and physical properties affecting soil fertility and plant nutrition. Soil fertility may be defined as the ability of soil to provide all essential plant nutrients in available forms and in a suitable balance whereas soil productivity is the resultant of several factors such as soil fertility, good soil management practices availability of water supply and suitable climate. The book has four parts. 1 NUEN MNEMEN CCA 1.5 NM CEU Sept. 2016 4449-2 NUTRIENT MANAGEMENT MODULE NO. Composition of the atmosphere 5. Soil Fertility book presents nine chapters written by renowned soil fertility experts from Africa, Asia and South America. 10


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