In a study in China, several different varieties of rice were planted in the same field. Crop yields increased by 89 percent compared with fields with a single variety of rice. This occurred because there was a dramatic decrease in disease and the fields remained stable without using pesticides. In addition, the system increased local biodiversity. This is an example of a(n) showing greater productivity and stability than a(n) . monoculture; polyculture polyculture; monoculture natural community; agricultural community agricultural community; natural community polyculture; natural community