Objectives

To understand the soil factors which influence plant growth so as to be able to manage soil fertility in a manner which is practically appropriate for various agricultural systems and environments.  To combine estimates of crop nutrient requirements under different environments with evaluation of soil fertility and soil chemistry in order to arrive at appropriate and efficient use of added nutrients.  To consider the interaction of economic and environmental factors with soil properties, and to be able to practically apply this knowledge in order to optimize productivity under different cropping situations.

 Course outline

Introduction

Crop nutrient requirements

Soil physical properties

Soil chemical properties

Organic matter

Properties and management of the essential nutrients:

• nitrogen
• phosphorus
• sulfur
• potassium
• calcium
• magnesium
• micronutrients

• acidity
• alkalinity
• sodality
• salinity
• other problem soils

Fertility of Zimbabwean soils

Economics of fertilizer use

Soil fertility and the environment

Soil management of selected systems:

•   variable rainfall conditions
•   communal lands
•   minimum tillage
•   pastures
•   agroforestry
•   flooded rice

 Assesment

 First term test                 10%
 Second term test             10%
 Practical assignments       13%
 Final examination           67%
 Total                            100%