Final answer:
Glenn Roberts practices shifting cultivation in his experimental research plots, which encourages diversity and the development of new crop varieties.
Step-by-step explanation:
Glenn Roberts practices shifting cultivation in his experimental research plots, which is a form of horticulture.
Shifting cultivation involves rotating crops over various plots of land and letting certain plots lie fallow to regenerate nutrients in the soil. This method encourages diversity and the development of new crop varieties.
By tailoring farming strategies and utilizing organic methods, farmers like Glenn Roberts can promote soil fertility, diversify crops, and reduce pesticide costs.