Types of environments

a) Researcher controlled environment

b) Semi-controlled environment

c) Uncontrolled environment

Why?

• To investigate relationship between genotype and different environmental changes.
• To identify genome that perform well over a wide range of environment.
• To identify genotype which perform well in particular environment.

Why experimental designs are used?

• So that treatment may be assigned in an organized manner.
• To allow valid statistical analysis to be carried out on the resulting data.
• To evaluate sources of variation keeping free from extraneous environmental factor.