Monoculture vs Polyculture

Hi All,

I know this is a simple question to pose to the members of this forum.  But I would like to go into detail and understand more in the process.

How do you define Monoculture?  When is Polyculture actually a Monoculture?

Regards
Padmanabhan Ganesan
9840807817

Monoculture-The cultivation of a single crop.
Polyculture- Created by you and no meaning.

Presently major people practicing mono crop/culture in poly/green houses.

en.wikipedia.org/wiki/Polyculture

Monoculture is all eggs in one basket and polyculture is spreading your risk thin?

poly = many
mono = single

this is the basic definition, advocates of sustainable agriculture advice you to go for poly as it resembles closely to the natural ecosystem so in a way better as a whole

blog.krya.in/2010/12/going-beyon … lyculture/

a good example

Hi All,

Let me give an example and try to understand more.

1 Acre = Mango Plantation.  Is this Monoculture?  If Yes, tell me whether the following is Monoculture or Polyculture.

5 Acres = 1 Acre Mango, 1 Acre  Coconut, 1 Acre Sapota, 1 Acre Guava, 1 Acre Drumstick

How the second one is different from the first one? If you say the first is Monoculture and the second is Polyculture, what is the difference?

Regards
Padmanabhan Ganesan
9840807817

Dear Padmanabhan,

Your query is quite clear.

Advocates of sustainable agriculture (I am one!) believe that agriculture can only become sustainable if the practitioner studies and understands nature in general and his local environment in particular and then ensures full adherence to the fundamental guiding principles that are already in operation in nature.

The forest is considered to be an ideal example of a sustainable ecosystem. It survives for thousands of years and can go on and on unless human interference upsets the delicate balance that has been established within. Nobody goes and spreads expensive chemical fertilisers, growth hormones, pesticides, fungicides, weedicides etc in a forest. Nobody even cultivates the soil. Countless species of insects, microbes, fungi, rodents, birds, reptiles, animals coexist within the forest - but one has never heard of a forest dying off because of ‘pest attack’ or some kind of disease.

Agriculture was always based on observations of such ecosystems and for about ten thousand years, man has tried to mimic and harness nature for his benefit. Human beings ‘domesticated’ several varieties of grass (all our foodgrains etc) and that is how farming started.

One very important principle that is observed in the forest example is ‘Biodiversity’ - the coexistence of numerous species side by side. This can be considered to be the most important principle behind sustainability. There are several advantages that biodiversity brings. e.g.

  1. Symbiotic, complementary relationships between different species of plants and animals have evolved over time. Trees make sugar available for fungi, while fungi play the key role of breaking down the decaying organic material on the forest floor and unlock nutrients for the trees. Earthworms feed on organic matter and ‘till’ the soil in a very beneficial manner and so on.

  2. As foodchains get established, an all-round  balance gets maintained automatically, No single species is allowed to overwhelm all the others, because the predators who are situated above it in the food chain will naturally grow correspondingly and keep its population under check. In mono cultures, this balance is lost. So if you have an orchard of only one type of fruit trees, or say a large farm of only one crop, it will always be vulnerable to the threat of a single type of insect proliferating beyond control and growing so strong that it destroys the entire crop. Then we are forced to respond with pesticides and the whole problem goes to the next plane!

  3. Climatic conditions are beyond human control (though we seem to be doing a good job messing them up!) So if for example, there is excessive rain which is bad for the monoculture, the entire crop is at risk. However, in a diverse crop mix, one crop may suffer, but some others may actually benefit from the rain and compensate in some way for the losses. This has been experienced by farmers for ages.

  4. Eventually, if the process of farming degenerates into a fight with A particular ‘pest’ (as as happened with all monocultures, sugarcane, alphonso, cotton etc) the risk grows greater. Because we are trying to ‘manage’ a certain species of insect with chemicals, we tend to lose sight of the amount and harmful side effects and characteristics of pesticides that we are using. The worst part is that the ‘pest’ in question adapts to the chemical and develops immunity in a few generations and you are back to square one.

These are some important arguments against the practice of monoculture.

Coming to your query - Even the second model with one acre sections of particular crops would be a technically monoculture. The solution perhaps would be to understand the threats to each crop and design the layout in such a way the all five acres would have all five species arranged in a mixed pattern that they would not compete with or dominate each other, and would actually be beneficial for each other in some way. Different species standing next to each other as close neighbors actually may work like ‘barriers’ for many pests with limited mobility, and ‘protect’ each other.

However, I think this will need detailed and deep study and sound knowledge of all the crops under consideration and perhaps even a ‘pilot’ model to test the theory.

Rgds

Naren         
   

Yes its monoculture.

There is no difference the two especially if you are growing each crop in a different patch of land. Both are monocultures.  It would be poly culture if you inter cropped all 5 crops within the 5 acres. To reiterate, Polyculture is multiple crops in the same space, mirroring the natural ecosystems whilst avoiding large tracts of land with lone crops.

Dear All,

To come to a better understanding, what is the level of Polyculture required either in a 1 Acre or a 5 Acres land?  Will it be row wise consideration or 20% of one crop in one place of the land?  Please suggest.

Regards
Padmanabhan Ganesan
9840807817

Dear Sir,
Again it will depends on your choice of main crop.
However mix with other crops in the 4.5 feet spacing between rows and main crops spacing should be 36 feet.
Once you get back than I can provide you the combination of crops.

Dear Padmanabhan,

There are other important aspects that need to be considered when deciding the crop layout as well. If your plot of land is not perfectly ‘flat’ (as is most likely the case) then the quality/grade of soil is also going to vary in the same plot from corner to corner. It will also depend on the watershed situation, proximity to large trees (shadow) etc. So it is not just a mathematical formula which will work at all farms all over the world. You will have to analyse your farm and arrive at your own unique design - usually through a process of observation, analysis, thinking, study, trial and errors!

Personally I do not think it is possible to prescribe such a formula (spacing, crop selection, varieties, manuring, irrigation methods etc) directly on the internet without studying the place physically and adequately.

This is a very important lesson that I believe all farmers should internalise - there are no set formulas for ‘success’ in farming. The guiding principles are universal, but their interpretation and adaptation are strictly local. This is why all ‘success stories’ prove to be misleading and usually cannot be duplicated.

Rgds

Naren

Rightly said

Like Naren mentioned already that there is no magic formula. In the purest sense, PC entails numerous species of plants/crops growing together. However, in practice, you would have a “primary crop” which would occupy most of your land. Then there will be a secondary crop raised among the Primary crop. There could further be a tertiary crop growing between the primary crop and the secondary crop. Now, what should be the primary, secondary and tertiary crop is essential a farmers choice which is influenced by soil /climatic conditions, demand/supply, marketability, labor, investment factor etc etc .

So, more is better than single at any option.
The benefit in combination of crops will save your water,manure, labour, soil erosion and gain of its health & many more benefits.