Talk:Crop rotation

message: — Preceding unsigned comment added by 203.215.125.175 (talk • contribs) 08:38, 10 October 2007
: ??  crop rotation is legal everywhere I think, but intercropping is a sin according to leviticus ch19 v19 :)  — Preceding unsigned comment added by Pignut (talk • contribs) 11:26, 5 February 2011 (UTC)
thread_title:  it is a crime 

message: This article talk page was automatically added with  banner as it falls under :Category:Food or one of its subcategories. If you find this addition an error, Kindly undo the changes and update the inappropriate categories if needed. The bot was instructed to tagg these articles upon consenus from WikiProject Food and drink. You can find the related request for tagging here . Maximum and carefull attention was done to avoid any wrongly tagging any categories , but mistakes may happen... If you have concerns , please inform on the project talk page -- TinucherianBot (talk) 18:06, 3 July 2008 (UTC)
thread_title:  [[WP:FOOD|WikiProject Food and drink]] Tagging 

message: The information on erosion was added as part of a class project at the University of Kentucky by a student enrolled in a soil management class.  —Preceding unsigned comment added by 128.163.194.32 (talk) 17:36, 4 December 2008 (UTC)
thread_title:  Erosion section 

message: Growing up in the 50s/60s in (upstate NY?? and) Indiana, crop rotation was a staple of the curriculum.  In recent years I have become aware that what I was taught in school, and that I never heard farmers my family socialized with say was BS, is no nolonger the common practice in the US or elsewhere in the world.  The article mentions the move away from crop rotation, but I wish an aggriculture specialist or student would fill in how the standard practice promoted by government farm extension programs seemingly suddenly vanished from recommended practice.  I heard or read a brief comment that pointed to Earl Butts as the key figure, and I do recall he was controversial, but I never understood the issues over Earl Butts. As the abandonment of crop rotation occurred worldwide, what were the forces driving it.  And what can be said about the efforts to return to the old methods? Mulp (talk) 18:41, 6 January 2009 (UTC)
thread_title:  History needs to be expanded? 

message: Naked fallows are mentioned in poetry by Robert Louis Stevenson, but not in this article. In trying to find a definition: I found this in  Papers and Articles
OSV Research Paper, author Jay Adams, 1978
:The major attitudes that I would ascribe to progressive farmers are: 1) a belief in intensive rather than extensive agriculture; 2) a commitment to the spirit of scientific inquiry; 3) support for and participation in agricultural societies and the farm press; and 4) a conviction that farmers deserved a higher place in society. On the farm, these attitudes were brought to life by adoption of some or all of the following practices: manuring, draining, deep plowing, alternating crops, root culture, row culture, the use of clover, and the substitution of fallow crops for naked fallows. --Notes on Progressive Agriculture
:--Pawyilee (talk) 13:41, 9 August 2010 (UTC)
thread_title:  Naked fallows 

message: This article largely covers the most of the general information concerning crop rotations. It discusses what, exactly, crop rotation is, how it works, its history, and what affects crop rotation has on the environment. The writing style is simple and informal. It seems to me more like the authors are trying to have a conversation with the reader rather than lay out the information in a clear and concise manner. Not to say they are bad writers, the article is just wordier than it truly needs to be.  Also, the illustrations and pictures are too few and unhelpful. They just show pictures of farms and large plots of land. That does not demonstrate anything about what crop rotation is. There need to be illustrations that actually showcase the process of crop rotations.
The sources, also, need work. Wikipedia is an online reference database, used mostly for quick reference alongside actual research. Therefore, there needs to be some sort of accountability for each page, each article. This crop rotation article does not have ideal sources. The sources listed are good, they are accurate, but they are inconsistent with Wikipedia’s speed, i.e. they are not links. It is tough to determine the accuracy of this pages information when the references cannot be quickly accessed, and when that is the case, one might as well just bypass the Wikipedia page altogether. The page needs more sources that can be directly linked to so the reader can quickly determine the page’s validity. Also, the sources need to be cited inside the article, as is stated by the box at the beginning of the article.
Basically, the article is sloppy. It has a lot of information; it’s just not organized very efficiently nor is it presented very well. One solid afternoon to find supplemental references, reorganize the information, and clean up the language should make this article much more useful.
HIST406-10msuterlo (talk) 14:48, 4 October 2010 (UTC)
thread_title:  Critique for HIST406 

message: There has been a lot of wishful thinking and misconceptions regarding the effects of crop rotations on soil fertility, and sadly, many farmers have gone bankrupt, depleted their soil and grown disillusioned with crop rotation and organic farming techniques in general, as a result.
Arable crop rotation (as distinct from ley-arable rotation) is better than continuous  monoculture of the same crop (for instance it reduces, pest and  disease problems), but arable crop rotation is unlikely to be sufficient, by itself (without inputs of compost/manure, or periods growing green manures or ley) to maintain or improve the fertility of the soil under rotation.
It is often said that different arable crops remove different proportions of the essential nutrients and return different proportions in their crop residues (stubble, roots etc.), so a rotation of different crops prevents imbalances of nutrients that could occur in continuous monoculture. This is probably true although hard scientific evidence for this is surprisingly scarce (probably due to difficulties measuring small changes in soil nutrients: Soil is an ecosystem, hard to study without distubing it. At any point in time Some soil minerals will be available for plants to use, but far more will be locked away in humus, leaf litter, microbes, the bodies of animals such as earthworms or stuck to particles of clay etc.). However the quantities of nutrients removed in the harvested  crop, and lost to groundwater and air as a result of soil cultivation are usually far greater than the quantities returned in crop residues.
Organic farming derives its name from Rudolf Steiner's concept of the farm as an organism, an interconnected whole. When a farmer says that a crop improves the "heart" or fertility of his land, many listeners will assume that the crop releases nutrients from its roots which enrich the soil it grows in. Few will consider the possibility that it might, for instance, allow the farmer to feed more animals from his land and thus get more, and richer, manure and compost.
19th century farmers considered turnips and potatoes to be soil improving crops, but the leaf and root residues left by a crop of potatoes are small. In fact, these root crops allowed the soil to be cleared of weeds, more animals to be fed over winter (before turnips were widely grown, many more animals had to be slaughtered in autumn), and the generous applications of manure thse crops received benefited subsequent crops. Potatoes and turnips do not themselves improve  the land, but the act  of growing them can!
Leguminous plants ('legumes'), (such as beans, peas, alfalfa, clover, gorse or acacia) can obtain (or "fix") some, or all of their nitrogen from the air with the aid of bacteria living in their roots, known as Rhizobia. The amounts of nitrogen they can obtain per hectare often far exceed the amounts commonly applied by farmers as nitrogen fertiliser. The fixed nitrogen is distributed throughout the legume plant, and contrary to popular belief, there is generally more fixed nitrogen in the leaves, flowers, stems and seeds of a legume plant than there is in their roots. As the legume plant flowers and makes seeds it transfers nitrogen from its leaves and roots into its flowers and seeds. An annual legume plant such as soya bean will transfer most of its nitrogen into its seeds, leaving comparatively little in its dry, dead, roots, stem and leaves at harvest time. Some fixed nitrogen leaks from the roots of legume plants, for instance, when roots die or decay. Neighbouring plants, such as grass growing with clover, or weeds growing with peas can benefit from this deposited nitrogen, as can successive crops, although much of the fixed nitrogen deposited this way will be lost to groundwater and the air before a successive crop can use it, especially if the soil is ploughed in the interim.
If a grain legume, such as soyabean, is harvested when the seeds are fully ripe, the soil it grew in will have about as much nitrogen in it as it did when the beans were planted. Some studies on this have found slight increases in soil nitrogen, others small decreases following a soya crop. Some fixed nitrogen has been deposited in the soil by the soya plant, some of this fixed nitrogen has been lost from the soil and some soil nitrogen has been taken up by the soy plant (legumes only fix nitrogen when they must. The Rhizobia receive sugar in exchange for nitrogen, so symbiotically fixed nitrogen costs the legume more than soil nitrogen). Most of the fixed nitrogen is in the harvested beans along with phosphate, potassium and other minerals from the soil.
If these soyabeans are fed to animals on the farm where they were grown and the resulting manure is used to feed crops, then the soyabeans will have helped the overall fertility of the farm. Likewise if they are eaten by people on the farm enlightened enough to use composting toilets, there will also be a benefit. If beans are picked green, the stems, leaves and roots will contain more of the fixed nitrogen (and the beans themselves proportionately less), which could significantly benefit the next crop (or make compost or provide high protein feed for animals and subsequently, nitrogen rich manure). If, however, the beans are exported from the farm, the meagre deposits of fixed nitrogen left in the beanfield will not be sufficient to supply the needs of a hungry crop like corn.
Alternating corn with soybeans and exporting the ripe harvest, (if fertilisers, manure or compost are not brought in from elsewhere), will deplete the soil of nitrogen and other minerals.
In a ley-arable rotation, a sequence of arable crops is followed by one or more years of ley (temporary grassland) for grazing by animals and/or cutting for hay/silage. It was this, rather than arable crop rotation which kick started the agricultural revolution of the 18th century. The ley usually contains leguminous plants such as clover as well as grasses (and hopefully herbs too), and these seeds may be undersown sown with the seeds of the preceeding arable crop (usually a cereal) reducing the crop yield a little, but sparing the soil another wasteful and destructive cultivation.
As explained earlier, leguminous plants leak some of their fixed nitrogen into the soil, and grasses growing alongside clovers will gain from this. A multi-species grassland is a jungle of fiercely competing plants, their roots entwined in a dense tangled mat, fighting for all the available nutrients. A field of vegetables or even cereals, in contrast, gets stripped bare of weeds annually. The seedlings grow, comfortably spaced apart, in unnaturally enriched soil free from competing weeds. The crop plants roots are often only just starting to efficiently exploit the soil when it is time for them to be harvested and the soil stripped bare ready for the next crop. Typically, arable crops utilise around half of the minerals fed to them as fertiliser, manure or compost. The rest is lost to groundwater and air.
The grasses in a ley continue to take up nitrogen in the winter, when the clovers etc. are dying back and consequently releasing more of their fixed nitrogen. In addition, grazing animals eat the leaves of leguminous plants and then transfer fixed nitrogen to grass and soil in their dung and urine. Grassland legumes such as clovers have evolved to thrive on this rough treatment. Grazing animals create a patchwork of high nitrogen patches where grasses, dominate and low nitrogen patches where legumes can thrive free from competing grasses. Under these conditions, legumes obtain almost all of their nitrogen from the atmosphere, taking little from the soil.
All these processes enrich the ley with far more nitrogen rich organic matter than could ever be left behind by a field of beans. In addition fixed nitrogen from the legumes is going into the animals, becoming meat, milk and eggs (proteins are nitrogen compounds). Fixed nitrogen is also removed to other parts of the farm as hay or silage which are eventually converted into more meat and milk and into manure which can enrich soil anywhere on the farm. The removal of nitrogen from the ley in this manner, stimulates more nitrogen fixation by the legumes (as long as there is no other mineral  deficiency). As the fixed nitrogen builds up in the ley, grass dominates at the expense  of the legumes, and it is time to plough the ley and begin the cycle again with an arable crop. This ploughing causes the highet losses of nutrients of any stage in the rotation, so should be well timed with regard to the weather and season. Planting should be done as quickly as is practical. Leys can  be managed as quick one or two year leys, primarily intended to enrich the soil where they grow, or as longer term leys to enrich the whole farm as well as the soil under the ley.
Green manures are crops grown to be ploughed or dug in to enrich the soil. They are especially useful in the absence of animals. They can also suppress weeds and pests. They may be legumes to enrich the soil with nitrogen or non-legumes to cover bare soil and prevent nutrient leaching. Deep rooting green manures can also bring nutrients up from the subsoil. Generally non-legumes are more useful than legumes for ground cover in cold winters as legumes don't fix nitrogen below around 7 degrees celsius, are less effective at stopping leaching and produce less biomass than many non-legume green manures. A mixture of legumes and non-legumes will usually fix slightly more nitrogen than a monoculture of the legume, produce more biomass and provide better groundcover. This is because Competition from a non-legume reduces the legume yield but forces the legume to fix a higher proportion of its nitrogen, by competing for the soil nitrogen. Legume green manures can also be undersown with crops, but more research is needed into this technique.
Green manure crops such as comfrey, alfalfa or grass can be grown as permanant stands, cut and used as compost or mulch. Trees can also be used to provide compost or mulch.
The increased nitrate and phosphate pollution of water in many areas over the last few decades is often blamed on synthetic fertilisers, which are a factor, but the main cause has been the conversion of mixed farms with permanant pastures, meadows, leys and trees, into entirely arable farms. An all arable farm using organic arable crop rotations or importing organic compost and manure to feed its crops, causes only slightly less nitrate pollution (per tonne of crop harvested) than an all arable farm using synthetic fertilisers. Both cause significantly more nitrate pollution than mixed farms (organic or not) where arable fields are interspersed with grassland. Much of this pollution derives from the breakdown of soil humus, which in a grassland or forest would remain stable for decades. Nitrate pollution and oher forms of eutrophication are natural capital going down the drain.
Conclusion: Rotations of arable cash crops will deplete soil nutrients and organic matter and are therefore unsustainable unless animal manures/compost are applied used, green manures used or (best of all) a ley phase included in the rotation. Tillage and bare soil increase losses of soil nutrients and soil organic matter, both should be minimised.Pignut (talk) 05:12, 5 February 2011 (UTC)
replies: text: Nice essay, but in my opinion it only shows poor understanding of the principles of crop rotation from the farmers that went bankrupt. Crop rotation was never ment of being the holy grail of a manure/fertilizer/herbicide/pesticide-free practice. It was ment as a cost-effective way to achieve higher yields... The Banner talk 14:47, 7 October 2012 (UTC)
thread_title:  Crop rotations and soil fertility 

message: I don't know what "fallow" is so I typed the word into wikipedia and it redirected me to this very article.  Unfortunately the article uses the word fallow a lot but I couldn't see where it explains what fallow is.  I still don't know.  This article should either explain this, or the redirect should be removed.  — Preceding unsigned comment added by 89.242.172.233 (talk) 17:01, 4 August 2011 (UTC)
replies: text: Fallow land = land ploughed and harrowed but left unsown. The Banner talk 15:46, 10 October 2012 (UTC)
thread_title:  What is fallow? 

message: What is "fallow" please? It redirects here, but I see no explanation in the lede, or indeed in the whole article. Thanks 219.78.114.1 (talk) 14:03, 7 October 2012 (UTC)
thread_title:  Fallow 

message: Substituted at 21:21, 19 March 2016 (UTC)
thread_title: Assessment comment

message: I am a new user looking to make bold edits of this page. I am most concerned with updating content, introducing more inline citations and scientific information from USDA and peer-reviewed sources. Please let me know if there is anything I should be aware of in advance. Thank you!  — Preceding unsigned comment added by Sfs329 (talk • contribs) 22:17, 30 April 2016 (UTC)
thread_title:  Bold edits/significant updates 

message: It says, in "Planning a rotation", "For example, a nitrogen-fixing crop, like a legume, should always proceed a nitrogen depleting one". Shouldn't that be "precede"? --User:Haraldmmueller 07:27, 7 October 2016 (UTC)
thread_title:  "Proceed"? ... "precede", IMHO 

message: George Washington Carver was indeed a scientist who, specifically, looked into nitrogen fixing in regards to crop rotation. However he was one of countless scientists looking into these agricultural developments -   In fact he has many contemporaries whose developments were actually impact full, put into common use, and are still in use to this very day. Particularly via the way of soy beans, there are several scientists who deserve accreditation in the "modern era" section that have apparently been overlooked in favor of Carver. He is worth including as very notable scientist, but not because of his impact in agriculture - but of because of his historical relevance in overcoming the discrimination African Americans Americans faced in his time, in academics, and in the south in general.  That is worth noting, but he shouldn't lead the segment unless context given as to why he's being mentioned.
If the mention was prefaced by a sentence saying, "In the modern era one prominent African American scientist who worked in this field in was GWC"  then the inclusion of Carver would make some more sense - as it stands its just appears a random scientist, who's work has minimal impact modern agriculture, is being mentioned before all others for no clear reason. He did teach, and thus he did teach Southern farmers, but the section is framed as if his methods were used by all farmers in the south, something that is patently false. 99.75.147.243 (talk) 17:42, 14 January 2023 (UTC)
replies: text: The 'Modern developments' section could definitely use expansion and improvement. If you have suggestions for WP:RS sources that describe other influential science in this area, please add those sources to the article or in a comment here.Dialectric (talk) 18:13, 15 January 2023 (UTC)
thread_title:  Why mention George Washington Carver and not scientists who's developments were adopted and are in use to this day? 

message: What is meant by crop rotation 2A00:F29:248:415C:C0F7:DAB8:C85D:DF6A (talk) 04:36, 24 August 2023 (UTC)
thread_title:  Science