| No-till farming |
No-till farming (also known as zero tillage or direct drilling) is an agricultural technique for growing crops or pasture without disturbing the soil through tillage. No-till farming decreases the amount of soil erosion tillage causes in certain soils, especially in sandy and dry soils on sloping terrain. Other possible benefits include an increase in the amount of water that infiltrates into the soil, soil retention of organic matter, and nutrient cycling. These methods may increase the amount and variety of life in and on the soil. While conventional no-tillage systems use herbicides to control weeds, organic systems use a combination of strategies, such as planting cover crops as mulch to suppress weeds.[1]
There are three basic methods of no-till farming. "Sod seeding" is when crops are sown with seeding machinery into a sod produced by applying herbicides on a cover crop (killing that vegetation). "Direct seeding" is when crops are sown through the residue of previous crop. "Surface seeding" or "direct seeding" is when seeds are left on the surface of the soil; on flatlands, this requires no machinery and minimal labor.[2]
While no-till is agronomically advantageous and results in higher yields, farmers wishing to adapt the system face a number of challenges. Established farms may have to face a learning curve, buy new equipment, and deal with new field conditions.[3] [4] Perhaps the biggest impediment, especially for grains, is that farmers can no longer rely on the mechanical pest and weed control that occurs when crop residue is buried to significant depths. No-till farmers must rely on chemicals, biological pest control, cover cropping, and more intensive management of fields.[5] [6] [7]
Tillage is dominant in agriculture today, but no-till methods may have success in some contexts. In some cases minimum tillage or "low-till" methods combine till and no-till methods. For example, some approaches may use shallow cultivation (i.e. using a disc harrow) but no plowing or use strip tillage.
Tillage is the agricultural preparation of soil by mechanical agitation, typically removing weeds established in the previous season. Tilling can create a flat seed bed or one that has formed areas, such as rows or raised beds, to enhance the growth of desired plants. It is an ancient technique with clear evidence of its use since at least 3000 B.C.[8]
No-till farming is not equivalent to conservation tillage or strip tillage. Conservation tillage is a group of practices that reduce the amount of tillage needed. No-till and strip tillage are both forms of conservation tillage. No-till is the practice of never tilling a field. Tilling every other year is called rotational tillage.
The effects of tillage can include soil compaction; loss of organic matter; degradation of soil aggregates; death or disruption of soil microbes and other organisms including mycorrhizae, arthropods, and earthworms;[9] and soil erosion where topsoil is washed or blown away.
The practice of no-till farming is a combination of different ideas developed over time, many techniques and principles used in no-till farming are a continuation of traditional market gardening found in various regions like France.