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Crop rotation as part of an organic gardening routine
The devastation of the Dust Bowl or the Irish Potato Famine can both be linked to one crucial farming mistake: monoculture. Monoculture in farming is the growing of a single crop on the same piece of land season after season. Crop Rotation involves changing the type of plant grown on a particular piece of land from year to year or season to season. Crop Rotation has many benefits for the soil, the crops and the population as a whole.
You may be familiar with the images of nutrient-leeched soil blowing across the country and driving families from their homes. You may have read about the Potato Famine, a case of monocultural disaster in which a single variety of potatoes was allowed to grow for too long in one place and did not have resistance to the potatoe blight. It turns out that these disasters could have been prevented with a little simple ancient wisdom.
How not rotating crops weakens the soil
Cover crops are good!
An example of a cover crop is rye. If you grow all of your tomato plants in one spot every spring, what do you do with this land during the winter? It is important to have a soil-building crop grown here in-between tomato crops. Rye will protect the soil from erosion with its roots, suffocate weeds, shade the soil from the sun and, eventually, become a rich food for your tomato plants to feast on.
Protect your garden from disease and pests
Diseases that target certain plant species can also be avoided with crop rotation. Some crops even assist in killing these pathogens. Diseases will not be allowed to grow and flourish in the soil of an ever-rotating crop. Just as rotating the furniture in your living room helps to prevent dust and mildew, so does plant rotation serve as a ‘spring cleaning’ for your garden.
Basics of crop rotation
Legumes are an example of a nitrogen fixing plant. These should be rotated with your vegetable crop in order to keep a proper amount of nitrogen in your soil. Crops most often paired by farmers are rice and cotton, and soybeans and maize. These crop pairings are essential for the continuing health of the soil.
In addition to being just plain good for your plants and the soil, you will find that crop rotation saves you money and trouble. By planting soil-building cover crops and nitrogen fixing crops you will save money on fertilizers: rye seeds are very cheap. By preventing the infestation of insects, weeds and diseases with cover crops and general rotation you are saving time, money and stress over pest-ridden crops.
Rotating crops is an ancient practice
Crop rotation has been taught by the proponents of the green revolution and is a key today to permaculture practices. George Washington Carver pushed for crop rotation in the United States and organic farmers around the world recognize its importance in preserving the health of the land and the people.
A natural crop rotation is occurring all around us, inside and outside of our gardens all of the time. A good organic farmer recognizes that nature knows best, and follows her guidance in her own garden.
The Irish Potato Famine could have been prevented had crop rotation been employed to divert the spread and growth the pathogenic fungus that caused the demise of the staple food of the living poor in Ireland. Furthermore, had the potatoes been planted in a polyculture, the spread of the fungus would have been further curtailed due to the fact that the vector of the fungus would be interrupted by plantings of soil building and nitrogen fixing plants.