Promotion of dairy products and implementation of technology in agriculture may have been part of Krishna’s plan to “establish dharma” on this planet. Dharma for an incarnation involves a lot more than we can imagine: it may include employment, food, and health for a majority of beings for ages to come. In the context of spiritual significance, cereals and dairy products make entries on Krishna’s list of sattva-natured eatables, which guide our instincts towards righteousness. They are offered to Krishna (and His other forms) with the belief that they are preferred by divinity. The trends He set up in agriculture have become permanent imprints on the Indian psyche.
Edited on July 27, 2013. Clarification: Balarama is known as Haladhara because he carried and probably promoted the use of the plough. He did not discover the instrument; Indians knew it even prior to his appearance on Earth.