No-till farming (also known as zero tillage or direct drilling) is an agricultural technique for growing crops or pasture without disturbing the

soil Soil, also commonly referred to as earth or dirt, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. Some scientific definitions distinguish ''dirt'' from ''soil'' by restricting the former ...

through

tillage Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shoveling, picking, mattock work, hoein ...

. No-till farming decreases the amount of

soil erosion Soil erosion is the denudation or wearing away of the upper layer of soil. It is a form of soil degradation. This natural process is caused by the dynamic activity of erosive agents, that is, water, ice (glaciers), snow, air (wind), plants, a ...

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

herbicide Herbicides (, ), also commonly known as weedkillers, are substances used to control undesired plants, also known as weeds.EPA. February 201Pesticides Industry. Sales and Usage 2006 and 2007: Market Estimates. Summary in press releasMain page f ...

s to control weeds, organic systems use a combination of strategies, such as planting cover crops as mulch to suppress weeds. 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 crops are left on the surface of the soil; on flatlands, this requires no machinery and minimal labor. Tillage is dominant in

agriculture Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people ...

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 A disc harrow is a harrow whose cutting edges are a row of concave metal discs, which may be scalloped or set at an oblique angle. It is an agricultural implement that is used to till the soil where crops are to be planted. It is also used to ...

) but no plowing or use strip tillage.

Background

Tillage Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shoveling, picking, mattock work, hoein ...

is the

agricultural Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled peopl ...

preparation of

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. No-till farming is not equivalent to

conservation tillage Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shoveling, picking, mattock work, hoeing, ...

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 In geotechnical engineering, soil compaction is the process in which stress applied to a soil causes densification as air is displaced from the pores between the soil grains. When stress is applied that causes densification due to water (or othe ...

; loss of

organic matter Organic matter, organic material, or natural organic matter refers to the large source of carbon-based compounds found within natural and engineered, terrestrial, and aquatic environments. It is matter composed of organic compounds that have c ...

; degradation of soil aggregates; death or disruption of soil

microbe A microorganism, or microbe,, ''mikros'', "small") and ''organism'' from the el, ὀργανισμός, ''organismós'', "organism"). It is usually written as a single word but is sometimes hyphenated (''micro-organism''), especially in olde ...

s and other organisms including

mycorrhiza A mycorrhiza (from Greek μύκης ', "fungus", and ῥίζα ', "root"; pl. mycorrhizae, mycorrhiza or mycorrhizas) is a symbiotic association between a fungus and a plant. The term mycorrhiza refers to the role of the fungus in the plan ...

arthropod Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and cuticle made of chiti ...

s, and

earthworm An earthworm is a terrestrial invertebrate that belongs to the phylum Annelida. They exhibit a tube-within-a-tube body plan; they are externally segmented with corresponding internal segmentation; and they usually have setae on all segments. T ...

s; and

where

topsoil Topsoil is the upper layer of soil. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Description Topsoil is composed of mineral particles and organic matt ...

is washed or blown away.

Origin

The idea of modern no-till farming started in the 1940s with Edward H. Faulkner, author of ''Plowman's Folly'', but it was not until the development after WWII of powerful

s such as

paraquat Paraquat ( trivial name; ), or ''N'',''N''′-dimethyl-4,4′-bipyridinium dichloride ( systematic name), also known as methyl viologen, is an organic compound with the chemical formula C6H7N)2l2. It is classified as a viologen, a family of re ...

that various researchers and farmers started to try out the idea. The first adopters of no-till include Klingman (North Carolina), Edward Faulkner, L.A. Porter (New Zealand), Harry and Lawrence Young (Herndon, Kentucky), the Instituto de Pesquisas Agropecuarias Meridional (1971 in Brazil) with Herbert Bartz.

Adoption across the world

Land under no-till farming has increased across the world. In 1999, about 45 million ha was under no-till farming worldwide, which increased to 72 million ha in 2003 and to 111 million ha in 2009.

Australia

Per figures from the

Australian Bureau of Statistics The Australian Bureau of Statistics (ABS) is the independent statutory agency of the Australian Government responsible for statistical collection and analysis and for giving evidence-based advice to federal, state and territory governments ...

(ABS) Agricultural Resource Management Survey, in Australia the percentage of agricultural land under No-till farming methods was 26% in 2000–01, which more than doubled to 57% in 2007–08. As at 30 June 2017, of the 20 million hectares of crop land cultivated 79% (or 16 million hectares) received no cultivation. Similarly, 70% (or 2 million hectares) of the 3 million hectares of pasture land cultivated received no cultivation, apart from sowing.

South America

South America had the highest adoption of No-till farming in the world, which in 2014 constituted 47% of the total global area under no-till farming. The countries with highest adoption are Argentina (80%), Brazil (50%), Paraguay (90%), and Uruguay (82%). In Argentina the usage of no-till resulted in reduction of soil erosion losses by 80%, cost reductions by more than 50% and increased farm incomes. In Brazil the usage of no-till resulted in reduction of soil erosion losses by 97%, higher farm productivity and income increase by 57% five years after the starting of no-till farming. In Paraguay, net farm incomes increased by 77% after adoption of no-till farming.

United States

No-till farming is used in the United States and the area managed in this way continues to grow. This growth is supported by a decrease in costs. No-till management results in fewer passes with equipment, and the crop residue prevents evaporation of rainfall and increases water infiltration into the soil. In 2017, no-till farming was being used in about 21% of the cultivated cropland in the US.

Benefits and issues

Profit, economics, yield

Some studies have found that no-till farming can be more

profit Profit may refer to: Business and law * Profit (accounting), the difference between the purchase price and the costs of bringing to market * Profit (economics), normal profit and economic profit * Profit (real property), a nonpossessory inter ...

able in some cases. In some cases it may reduce labour, fuel,

irrigation Irrigation (also referred to as watering) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been devel ...

and machinery costs. No-till can increase yield because of higher water infiltration and storage capacity, and less erosion. Another possible benefit is that because of the higher water content, instead of leaving a field fallow it can make economic sense to plant another crop instead. A problem of no-till farming is that in spring, the soil both warms and dries more slowly, which may delay planting. Harvest can thus occur later than in a conventionally tilled field. The slower warming is due to crop residue being a lighter color than the soil which would be exposed in conventional tillage, which then absorbs less solar energy. However, that is being affected by climate change, so warmer temperatures may offset these effects. But in the meantime, this can be managed by using row cleaners on a planter. A problem with no-till farming is that if production is impacted negatively by the implemented process then the profitability of the practice also may decrease in relation to increasing gas prices and high labor costs. As the prices for fuel and labor continue to rise, it may be more practical for farms and farming productions to turn toward a no-till operation. In spring, poor draining clay soil may have lower production due to a cold and wet year. The economic and ecological benefits of implementing no-till practices can require sixteen to nineteen years. The first decade of no-till implementation often will show trends of revenue decrease. Implementation periods greater than ten years in length usually show a gain in profit, rather than a decrease in profitability.

Costs and management

No-till farming requires some different skills from those of conventional farming. A combination of technique, equipment, pesticides,

crop rotation Crop rotation is the practice of growing a series of different types of crops in the same area across a sequence of growing seasons. It reduces reliance on one set of nutrients, pest and weed pressure, and the probability of developing resistant ...

, fertilization, and irrigation have to be used for local conditions.

Equipment

On some crops, like continuous no-till corn, the thickness of the residue on the surface of the field can become a problem without proper preparation and/or equipment. No-till farming requires specialized seeding equipment, such as heavier seed drills to penetrate through the residue. Ploughing requires more powerful

tractor A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery such as that used in agriculture, mining or construction. Most commo ...

s, so tractors can be smaller with no-tillage. Costs can be offset by selling ploughs and tractors, but farmers often keep their old equipment while trying out no-till farming. This results in a higher investment into equipment.

Increased herbicide use

One of the purposes of tilling is to remove weeds. No-till farming changes weed composition: faster growing weeds may be reduced as increased

competition Competition is a rivalry where two or more parties strive for a common goal which cannot be shared: where one's gain is the other's loss (an example of which is a zero-sum game). Competition can arise between entities such as organisms, ind ...

with eventual growth of

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also widel ...

s, shrubs and trees. This problem is usually solved with a

such as glyphosate in lieu of tillage for

seedbed A seedbed or seedling bed is the local soil environment in which seeds are planted. Often it comprises not only the soil but also a specially prepared cold frame, hotbed or raised bed used to grow the seedlings in a controlled environment into ...

preparation, so no-tillage often uses more herbicides in comparison to conventional tillage. Some alternatives can be winter cover crops,

soil solarization Soil solarization is a non-chemical environmentally friendly method for controlling pests using solar power to increase the soil temperature to levels at which many soil-borne plant pathogens will be killed or greatly weakened. Soil solarization i ...

or burning. However the use of herbicides is not strictly necessary, as demonstrated by Masanobu Fukuoka. No-till occasionally uses

cover crop In agriculture, cover crops are plants that are planted to cover the soil rather than for the purpose of being harvested. Cover crops manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity and wildlife in ...

s to help control weeds and increase organic residue in the soil (or nutrients by using

legumes A legume () is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock for ...

). Cover crops then need to be killed so that the newly planted crops can get enough light, water, nutrients, etc. This can be done by rollers, crimpers, choppers and other ways. The residue is then planted through, and left as a mulch. Cover crops typically must be crimped when they enter the flowering stage. With no-till farming, residue from the previous year's crops lie on the surface of the field, which can cause different, greater, or more frequent disease or weed problems compared to tillage farming.

Fertilizer

One of the most common yield reducers is nitrogen being immobilized in the crop residue, which can take a few months to several years to decompose, depending on the crop's C to N ratio and the local environment. Fertilizer needs to be applied at a higher rate. An innovative solution to this problem is to integrate

animal husbandry Animal husbandry is the branch of agriculture concerned with animals that are raised for meat, fibre, milk, or other products. It includes day-to-day care, selective breeding, and the raising of livestock. Husbandry has a long history, starti ...

in various ways to aid in decomposition. After a transition period (4–5 years for Kansas, USA) the soil may build up in organic matter. Nutrients in the organic matter are eventually released into the soil..

Environmental Policy

A legislative bill, H.R.2508 of the 117th Congress, also known as the NO EMITS act, has been proposed to amend the

Food Security Act of 1985 The Food Security Act of 1985 (P.L. 99–198, also known as the 1985 U.S. Farm Bill), a 5-year omnibus farm bill, allowed lower commodity price and income supports and established a dairy herd buyout program. This 1985 farm bill made changes in ...

, that was introduced by Representative Rodney Davis of Illinois. Davis is a member of the House Committee on Agriculture. This bill proposes suggestions for offsetting emissions that are focused in agricultural means, doing so by implementing new strategies such as minimal tillage or no tillage. H.R.2508 is currently under reference by the House Committee of Agriculture. H.R.2508 is also backed by two other representatives from high agricultural states, Rep. Eric A. Crawford of Arkansas and Rep. Don Bacon of Nebraska. H.R.2508 is proposing to set up incentive programs to provide financial and mechanical assistance to farmers and agriculture plots that transition their production processes, as well as providing contacts to lower risk for producers. Funding has also been proposed for Conservation Innovation Trails. Farmers within the U.S. are encouraged through subsidies and other programs provided by the government to meet a defined level of tillage conservation. Such subsidies and programs provided by the U.S. government include:

Environmental Quality Incentives Program The Environmental Quality Incentives Program (EQIP) is a United States government program designed to assist farmers in improving environmental quality, particularly water quality and soil conservation. Congress established the program in the 1996 ...

(EQIP) and Conservation Stewardship Program (CSP). The EQIP is a voluntary program that attempts to assists farmers and other participants help through conservation and not financially suffer from doing so. Efforts are put out to help reduce the amount of contamination from the agricultural industry as well as increasing the health of the soil. The CSP attempts to assist those who are looking to implement conservation effort into their practices by giving suggestions on what might be done for their given circumstance and needs.

Environmental

Greenhouse gases

No-till farming has been claimed to increase

soil organic matter Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal detritus at various stages of decomposition, cells and tissues of soil microbes, and substances that soil microbes synthesize. SOM provides numerous b ...

, and thus increase

carbon sequestration Carbon sequestration is the process of storing carbon in a carbon pool. Carbon dioxide () is naturally captured from the atmosphere through biological, chemical, and physical processes. These changes can be accelerated through changes in lan ...

. While many studies report soil organic carbon increases in no-till systems, others conclude that these effects may not be observed in all systems, depending on factors, such as climate and top

soil carbon Soil carbon is the solid carbon stored in global soils. This includes both soil organic matter and inorganic carbon as carbonate minerals. Soil carbon is a carbon sink in regard to the global carbon cycle, playing a role in biogeochemistry, c ...

content. A 2020 study demonstrated that the combination of no-till and cover cropping sequesters more carbon than either practice alone, suggesting that the two practices have a synergistic effect in carbon capture. There is debate over whether the increased sequestration sometimes detected is actually occurring, or is due to flawed testing methods or other factors. A 2014 study claimed that certain no-till systems may sequester less carbon than conventional tillage systems, saying that the “no-till subsurface layer is often losing more soil organic carbon stock over time than is gained in the surface layer.” The study also pointed out the need for a uniform definition of soil organic carbon sequestration among researchers. The study concludes, "Additional investments in soil organic carbon (SOC) research is needed to better understand the agricultural management practices that are most likely to sequester SOC or at least retain more net SOC stocks." No-till farming reduces

nitrous oxide Nitrous oxide (dinitrogen oxide or dinitrogen monoxide), commonly known as laughing gas, nitrous, or nos, is a chemical compound, an oxide of nitrogen with the formula . At room temperature, it is a colourless non-flammable gas, and ha ...

(N₂O) emissions by 40-70%, depending on rotation. Nitrous oxide is a potent greenhouse gas, 300 times stronger than , and stays in the atmosphere for 120 years.

Soil and desertification

No-till farming improves aggregates and reduces

erosion Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is d ...

. Soil erosion might be reduced almost to soil production rates. Research from over 19 years of tillage studies at the

United States Department of Agriculture The United States Department of Agriculture (USDA) is the federal executive department responsible for developing and executing federal laws related to farming, forestry, rural economic development, and food. It aims to meet the needs of comme ...

Agricultural Research Service The Agricultural Research Service (ARS) is the principal in-house research agency of the United States Department of Agriculture (USDA). ARS is one of four agencies in USDA's Research, Education and Economics mission area. ARS is charged with ext ...

found that no-till farming makes soil less erodible than ploughed soil in areas of the

Great Plains The Great Plains (french: Grandes Plaines), sometimes simply "the Plains", is a broad expanse of flatland in North America. It is located west of the Mississippi River and east of the Rocky Mountains, much of it covered in prairie, steppe, a ...

. The first inch of no-till soil contains more aggregates and is two to seven times less vulnerable than that of ploughed soil. More

in this layer is thought to help hold soil particles together. As per the

Food and Agriculture Organization The Food and Agriculture Organization of the United Nations (FAO)french: link=no, Organisation des Nations unies pour l'alimentation et l'agriculture; it, Organizzazione delle Nazioni Unite per l'Alimentazione e l'Agricoltura is an intern ...

(FAO) of the United Nations, no-till farming can stop

desertification Desertification is a type of land degradation in drylands in which biological productivity is lost due to natural processes or induced by human activities whereby fertile areas become increasingly arid. It is the spread of arid areas caused ...

by maintaining

and reducing wind and water

. No ploughing also means less airborne dust.

Water

No-till farming improves water retention:

crop residue Crop residues are materials left in an agricultural field after the crop has been harvested. These residues include stalks and stubble (stems), leaves and seed pods. Good management of field residues can increase efficiency of irrigation and c ...

s help water from natural precipitation and irrigation to infiltrate the soil. Residue limits

evaporation Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. High concentration of the evaporating substance in the surrounding gas significantly slows down evaporation, such as when h ...

, conserving water. Evaporation from tilling increases the amount of water by around 1/3 to 3/4 inches (0.85 to 1.9 cm) per pass. Gully formation can cause soil erosion in some crops such as soybeans with no-tillage, although models of other crops under no-tillage show less erosion than conventional tillage. Grass waterways can be a solution. Any gullies that form in fields not being tilled get deeper each year instead of being smoothed out by regular plowing. A problem in some fields is water saturation in soils. Switching to no-till farming may increase drainage because soil under continuous no-till include a higher water infiltration rate.

Biota and wildlife

No-tilled fields often have more

annelid The annelids (Annelida , from Latin ', "little ring"), also known as the segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecol ...

s, invertebrates and wildlife such as

deer mice Deer or true deer are hoofed ruminant mammals forming the family Cervidae. The two main groups of deer are the Cervinae, including the muntjac, the elk (wapiti), the red deer, and the fallow deer; and the Capreolinae, including the reindeer ...

Albedo

Tillage lowers the

albedo Albedo (; ) is the measure of the diffuse reflection of solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body that refle ...

of croplands. The potential for global cooling as a result of increased albedo in no-till croplands is similar in magnitude to other biogeochemical carbon sequestration processes.

References

External links

Texas A&M AgriLife Research and Extension Center at Lubbock; along with New Mexico University Extension Service
No-till and Cover Crops for Texas and New Mexico.
VicNoTill at Horsham, Victoria
No-Till Regenerative Farming Systems Australia. {{DEFAULTSORT:No-Till Farming Agronomy Agricultural soil science Energy conservation Sustainable agriculture