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The Use of Cover Crops to Manage Soil University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln U.S. Department of Agriculture: Agricultural Publications from USDA-ARS / UNL Faculty Research Service, Lincoln, Nebraska 2011 The Use of Cover Crops to Manage Soil T. C. Kaspar USDA-ARS, [email protected] J. W. Singer USDA-ARS, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/usdaarsfacpub Kaspar, T. C. and Singer, J. W., "The Use of Cover Crops to Manage Soil" (2011). Publications from USDA- ARS / UNL Faculty. 1382. https://digitalcommons.unl.edu/usdaarsfacpub/1382 This Article is brought to you for free and open access by the U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Publications from USDA-ARS / UNL Faculty by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. 21 The Use of Cover Crops to Manage Soil T.C. Kaspar and J.W. Singer over crops are used to manage soils for many diff erent reasons and are known by many Cdiff erent names. Cover crops are literally “crops that cover the soil” and one of their fi rst uses was to reduce soil erosion during fallow periods in annual cropping systems. Cover crops are also known as “green manures,” “catch crops,” or “living mulch.” Green manure cover crops are usually legumes that fi x N and are grown to provide N to the following cash crop. Catch crops are cover crops that are grown during fallow periods in cropping systems to take up nutrients, especially N, that would be lost if plants are not present. Lastly, living mulches are cover crops that are grown both during and aft er the cash crop growing season and are suppressed or managed to reduce their competition with the cash crop when it is growing. Aft er the cash crop has matured and before it begins growing again, the living mulch is allowed to grow unhindered. One way to manage living mulches is to restrict them to the “fallow” spaces between crop rows. Orchards or vineyards are sometimes managed with liv- ing mulches, but it is also possible to incorporate living mulches into annual cropping systems. Thus, as can be seen from their many names and descriptions, cover crops can fulfi ll many soil management functions. In terms of soil management, the basic premise for using cover crops is to reduce fallow periods and spaces in cropping systems. Natural ecosystems typically have some plants growing, covering the soil, transpiring water, taking up nutrients, fi xing carbon, and sup- porting soil fauna for most of the time that the ground is not frozen. Agricultural cropping systems producing grain, oilseed, and fi ber crops in temperate regions typically only have living plants for four to six months of the year and are fallow for the remaining six to eight months. Current planting and tilling practices oft en leave soil bare and exposed during fall, winter, and early spring. Some perennial cropping systems for nut or fruit crops (e.g., almonds and grapes) keep the spaces between rows fallow and tilled for extended periods. As a result of these fallow periods and fallow spaces in annual and perennial cropping sys- tems, soil is left unprotected from erosive forces, nutrients and organic matt er are lost or not replenished, runoff increases, soil fauna are stressed, and soil productivity diminishes. Thus, inserting cover crops into fallow periods or fallow spaces in cropping systems can accom- plish multiple soil management goals. This discussion is not intended to be a comprehensive review and will focus on the general principles and evidence for using cover crops to man- age soil erosion, runoff , soil nutrients, soil physical properties, soil water, soil organic carbon, soil chemical properties, and soil biology. T.C. Kaspar ([email protected]) and J.W. Singer ([email protected]), USDA-ARS, Na- tional Laboratory for Agriculture and the Environment, 2110 University Boulevard, Ames, IA 50011. doi:10.2136/2011.soilmanagement.c21 Copyright © 2011. American Society of Agronomy and Soil Science Society of America, 5585 Guilford Road, Madison, WI 53711, USA. Soil Management: Building a Stable Base for Agriculture. Jerry L. Hatfi eld and Thomas J. Sauer (ed.) 321 was much greater in tilled systems than in Erosion and Runoff no-till systems and much greater in no-till Reducing water erosion is one of the main following a soybean crop than following reasons for growing cover crops (Langdale a soybean–wheat double crop. Kaspar et et al., 1991). Soils are generally more suscep- al. (2001), however, showed that oat (Avena tible to erosion when they are not covered sativa L.) or rye (Secale cereale L.) cover crops with the canopies of living plants or their in no-till soybean reduced interrill erosion plant residues. Annual crop plants, such in two of three rainfall simulator trials even as corn (Zea mays L.) and soybean [Glycine though residue cover did not increase sig- max (L.) Merr.], only provide signifi cant can- nifi cantly with cover crops and was already opy cover for four months or less each year. greater than 75% without cover crops. They Additionally, crops such as soybean, cott on hypothesized that the decreases in inter- (Gossypium hirsutum L.), or corn harvested rill erosion with cover crops was caused for silage oft en do not leave enough residues by reduced interrill transport of sediments. to fully protect the soil between harvest They observed that the anchoring of cover and development of the next crop canopy. crop plants or residues to the soil by roots Cover crops and their residues reduce ero- resulted in the formation of microdams, sion through the same mechanisms as the which probably resulted in sediment depo- cash crops. However, when cover crops are sition. Latt anzi et al. (1974) also observed grown in the fallow intervals between cash that increasing amounts of surface residues crops they extend the time the soil is cov- reduced interrill erosion by intercepting ered with living plants and also supplement splash transport of sediment, slowing inter- and anchor residues left by annual crops. rill fl ow velocity, and increasing water fi lm The impact of cover crops on erosion pro- depth behind residue microdams. cesses depends on how much they reduce Whereas interrill erosion is largely the forces of soil detachment and transport. dependent on raindrop impact to detach Cover crops reduce interrill erosion pri- soil particles, rill erosion relies on the shear marily because they increase the amount force of water fl owing in concentrated fl ow and duration of soil cover either with liv- paths to both detach and transport soil ing plants or plant residues. Soil cover is particles (Flanagan, 2002). Cover crops can the principal characteristic of cropping reduce rill erosion by reducing the shear systems that aff ects the amount of interrill force of fl owing water or by increasing the erosion. Because interrill erosion results resistance of soil particles to detachment. from the detachment of soil particles by One way cover crops reduce the shear force raindrop impact, living or dead plant mate- of runoff water is by reducing its volume rial that intercepts raindrops and dissipates through increased infi ltration. This occurs impact energy will reduce interrill erosion. because cover crops prevent surface seal- Ram et al. (1960) observed that soil detach- ing, increase storage capacity, and improve ment from raindrop impact was reduced as soil structure (Dabney, 1998). Additionally, cover crop canopy increased either because cover crops or surface residues (Brown and of plant density or plant growth. Later, Laf- Norton, 1994) can slow fl ow velocity at the len et al. (1985) showed that the relationship surface by increasing hydraulic resistance. between surface cover and erosion reduc- Lastly, because cover crop plants or resi- tion is exponential with smaller decreases dues are anchored to the surface by roots in erosion as surface cover approaches 100%. and because they hold other unanchored This explains why the relative benefi t of surface residues in place (Kaspar et al., 2001), incorporating cover crops into a cropping fl owing water cannot easily move residues system depends to some extent on the quan- and expose the soil surface to shear forces of tity, duration, and distribution of residues water (Foster et al., 1982). and plant canopies that are normally pres- Cover crops also reduce both rill and ent in the cropping system throughout the interrill erosion by increasing soil resis- year (Mutchler and McDowell, 1990). For tance to detachment. Cover crops are example, Mutchler and McDowell (1990) known to increase soil organic matt er near found that the reduction of erosion by a the soil surface (Wander et al., 1994), which hairy vetch (Vicia villosa Roth)–wheat (Triti- in turn should result in larger, more sta- cum aestivum L.) winter cover crop mixture ble aggregates that are less susceptible 322 The Use of Cover Crops to Manage Soil | T.C. KasparChapter and J.W. | Authors Singer Soil Management Practices to detachment (Dabney, 1998). Addition- 90% compared with no-till without cover ally, cover crop roots can physically bind crops. Oat cover crops, which winter-kill in aggregates together, which makes them Iowa, reduced interrill and rill erosion by even more resistant to detachment by fl ow- 26% and 65%, respectively. Neither rye nor ing water or raindrop impact. Mamo and oat cover crops signifi cantly increased sur- Bubenzer (2001) confi rmed that plant roots face cover, which was already greater than substantially reduced soil detachment and 75% for the no-till soybean without cover rill erodibility.
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