Looking at your farm as an interdependent entity means evaluating how each aspect, crop or product interacts with the ecosystem of your farm. Most farmers only think about these things when it comes to growing zones and choosing plant varieties. There is so much more to this equation if your long-term goals include stewardship, sustainability, and consistent profits.
Farming is a challenge under the best of circumstances. Weather and rising cost of inputs being only two of the variables you must accommodate to succeed. By examining the micro-environment of your farm, you can make informed decisions about plant and animals that will not only grow and make money for you but will continue to enhance the ecosystem of your farm.
Monocropping (planting only one type of plant or raising only one type of animal) only makes your farm subject to the whims of the market and attack by pests. This type of single mindedness will need a large amount of inputs like fertilizer and pesticides to bring your ecosystem even close to being back into balance and ready to monocrop year after year. This type of farming is not only riskier and more costly but unsustainable.
Holistic Farming works with the environment not against it. By having diversity in your crops and animals you not only work with nature to create a sustainable farm, but you create multiple income streams. Both of these factors are important in creating a sustainable farm.