Field experimentation is integral to the plant breeder’s job function and the mastery of its techniques based soundly on statistical or biometrical principles as applied to the crop of interest. It is through these field experiments particularly those with a genetic analysis structure that it is possible to establish the various relevant information of 328plant breeding interest as discussed in Chapter 4 earlier. In addition the following could also be established:

The breeding system of the germplasm and to devise a sampling system for future prospection in the various centers of crop diversity for genetic conservation or improvement of specific traits (see also Chapter 4).

The adaptability of the germplasm and traits concerned in the various ecological (location) and agronomic (spacing, fertilizer, and irrigation) environments of interest to the plant breeder.

The best varieties with broad adaptability and also those for specific adaptation.

The minimal sample size (e.g., trees, bunches, fruits, and leaves) or number of measurements and the measurement periods (monthly, quarterly, and yearly) of observations to characterize a plant or crop mean for a trait.

Molecular marker-assisted selection (MAS) procedures.