What term describes the practice of agriculture that is designed to manipulate and enhance food yields?

The term that best describes the practice of agriculture aimed at manipulating and enhancing food yields is intensive agriculture. This practice involves the use of advanced techniques and technology to maximize production per unit of land. Intensive agriculture often includes methods such as the application of fertilizers, irrigation systems, and higher crop density, all designed to significantly increase the output of food compared to more traditional methods of farming.

In contrast, subsistence farming typically refers to growing only enough food to feed the farmer's family, without significant surplus for trade or sale. Horticulture, while it does involve the cultivation of plants, usually pertains to smaller scale farms focused on crops like fruits and vegetables but doesn't necessarily imply the extensive manipulation of yields associated with intensive practices. Agriculture as a broader term encompasses various methods of farming, including both subsistence and intensive practices, but does not specifically highlight the enhancements and manipulations aimed at increasing food yields. Therefore, intensive agriculture is the most precise term in this context.