"The Nation That Destroys It's Soils Destroys Itself" Roosevelt 1937

2.2 Million Tonnes of top soil are lost each year from UK agricultural soils.PASTURE FARMING HAS THE ANSWER. President Roosevelt 1937 made his statement about soils after the 1930s & the Mid West Dust Bowl, but have we learnt the lesson....Topsoil loss is a serious issue in the UK TODAY.
http://www.guardian.co.uk/environment/2009/sep/24/topsoil-farming-defra
The Governments response (now archived by Defra) was a Soil Strategy Plan http://archive.defra.gov.uk/environment/quality/land/soil/documents/soil-strategy.pdf
http://www.guardian.co.uk/environment/2009/sep/24/topsoil-farming-defra
The key issues identified in the degradation of UK soils are topsoil loss, compaction & the loss of Soil Organic Matter. Under good dairy pastures & sound grazing management is usually a healthy soil environment. Permanent pastures encourage build ups of Soil Organic Matter & healthy soil life. However all that happens on UK low input dairy farms does not favour a healthy soil. E.g. excessive use of Nitrogen, poor drainage, poor use of manures or cultivation/ploughing.
In this new carbon environment we need to change our ways.” We cannot solve our problems with the same thinking we used when we created them.” Albert Einstein.
http://www.telegraph.co.uk/earth/agriculture/farming/6828878/Britain-facing-food-crisis-as-worlds-soil-vanishes-in-60-years.html During & post WW2, Winston Churchill ordered as much of the UK that could be ploughed should be so that arable crops could be grown to feed the nation. The response & the efforts of farmers fed the nation, the right call at the time. Ploughing & cultivation however increases the potential loss of topsoil & destroys the soil structure & certainly speeds up the loss of soil organic matter. These are serious issues to be addressed by the arable industries but pasture farmers need to take heed too. http://archive.defra.gov.uk/environment/quality/land/soil/documents/soil-strategy.pdf
One aspect of soil management the pasture based dairy farmers can modify is cultivation & ploughing. With increasingly intensive farming there has been a tendency for topsoil structure to weaken as organic matter is used up and not returned to the soil. Weakly aggregated soils disintegrate under the influence of heavy rainfall and soil particles become mobilised. In recent years cultivation has been extended more and more to sloping fields. The combination of weakly structured soils and sloping fields provide ideal conditions for soil runoff.
http://www.soil-net.com/dev/page.cfm?pageid=about&loginas=anon_about
The loss of precious Soil Organic Matter is likely to be more serious. When soils are cultivated they are exposed to the air & the oxidization of SOM increases. The dry soil surface & lack of plant cover makes this worse. We have to find ways of direct drilling pastures & winter crops so we can leave the soil intact. In Australia some innovators have developed the concept of “Pasture Cropping” for wheat. Have a look at these YouTube videos http://www.youtube.com/watch?v=khNprFGW0N8&feature=related
How can we in the UK adapt to ideas of young Darren Doherty out in Victoria, Australia? http://regenag.com/web/about-us.html
We need to STOP PLOUGHING MR CHURCHILL. We have direct drilling technology (not new) & we can subsoil to deal effectively with compaction.
Properties of healthy soils
We need to see ourselves as CARBON FARMERS everything we do should consider the impact on carbon. Soil health is a relatively new concept because we have tended to do soil tests only to measure the available minerals for plant nutrition. We still have a situation in the UK where few “Standard Pasture” soil tests include Soil Organic Matter %. Why?
Soil characteristics that contribute to a healthy soil include
• protected soil surface and low erosion rates
• high soil organic matter
• high biological activity and biological diversity
• high available moisture storage capacity
• favourable soil pH
• deep root zone
• balanced stores of available nutrients
• resilient and stable soil structure
• adequate internal drainage
• favourable soil strength and aeration
• favourable soil temperature
• low levels of soil born pathogens
• low levels of toxic substances.
http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0010/166897/soil-health-proceedings-2001.pdf
Direct drilling of winter crops does work we need to work on the technologies & timings to be successful. See the winter crop below that was successfully direct drilled (actually into very dry soils). Why is SOIL ORGANIC MATTER % tests NOT part of the standard soil test in the UK?
A very good question WHY NOT? If you are getting a pasture soil test done PLEASE INSIST that the Soil Organic Matter % is included…..Start monitoring SOM%.
Current UK Pasture Measurements
A mixed bag this week as some areas have responded to recent rain while others have not. Growth in Scotland looks very good as does North Wales & Lincolnshire but southern areas struggling. Several indications of pasture quality slipping with the onset of ryegrass heading. Several NZ varieties of ryegrass which are classified as late heading in NZ become mid range heading in UK.
The weekly task of texting me the current pasture information has brought out the comedians....thanks guys for your weekly help. Please text me your humour & your pasture data.
TheAverage Pasture Cover (kgsDM/ha) & Pasture Growth (kgsDM/ha/day)
South Ayrshire, AFC 2524, Growth 93 soil temp 15degrees C
Dumfries, 2105, Gr 63, Demand 49, rain on & off, wet knees when measuring pasture (only kidding!)
Nth Wales, 2076, gr66 still dry despite rain OAD doing very well
Shropshire organic, 1892, gr 19, no rain, too hard to dig spear thistles
Shropshire, 2000, gr 8
East Staffordshire, 1900, gr 37
Lincolnshire, growth up to 96kgs compared to 40 last week, good rain & warmth.
Herefordshire org, 2263, gr44, demand 48, pastures heading
Gloucestershire, 2115, gr 47, difficult to text as mid rain dance!
Somerset org, 1850, gr 27, de 36, rain needed
Pembrokeshire, 2108, gr59, premowing silage ground
Pembrokeshire, 1932, gr 50 just cut silage
Devon, 2250, gr 45, grazing silage & feeding silage
Cornwall, 2030, gr 43 feeding 5kgsdm silage, rain please
South Kilkenny, Ireland, 1981, gr50, demand 46
Winton, South Island NZ, AFC 1900, growth 20kgs, outwintering on foddercrops

Pasture based Dairyfarm Expansion....Think Water!

This week I have made some changes to the blog which I hope will make it more interesting to visit.
If you look down the right hand side of this blog page you will see a number of different sections. First is the Twitter updates listing recent entries I have made onto Twitter....you may not be a "tweeter" but these messages go out to a huge audience both in the UK & worldwide to a very mixed & often non farming audience. I think its important that we tell both consumers & Govt people what we are doing & regularly tell them what is good about grass fed milk & how environmentally careful we as pasture based dairy farmers really are every day of the year. Nor am I hesitant to tell ministers to sort problems like rampant ragwort on our motorways & roadsides which are a serious threat to dairy cows & dairyfarms.

Next I have added a number of other blogs from around the world that you might like to read & investigate.

Check out TOM'S FAVOURITE BLOGS (see on the righthand side of this page)

I hope you enjoy the extra reading material that is now on the Pasture to Profit Blog..

Stock Drinking Water is Very Important

Water is a crucial part of herd expansion & needs careful planning. You need to start with the existing water supply but often this is woefully inadequate. Too often water pipes are too small & nobody knows where the existing pipes are located.

Water & tracks go together. Water pipe lines are easier to install before subdivision fence lines or tracks are laid but it all needs to be part of the big plan. Get expert help to create a farm plan for the expanded herd size. I still think the number of paddocks is far more important than the actual size. I recommend 30 per farm.

Bertie Troy provides a very good mapping service for pasture based dairy farmers in the UK & Ireland http://www.grasstec.ie/

An important animal welfare issue for all dairyfarmers is that dairy cows have access to good quality drinking water at all times.http://www.dpi.vic.gov.au/dpi/nrenti.nsf/LinkView/85DA1027B08FF286CA25750E0005C7A85B65FD3894DB84E6CA2574AC000CF430/$file/Dairy%20Industry%20Welfare%20Report.pdf

However this is also closely linked to profit & milk production as milking cows without adequate water drop in milk production immediately.

No farmer likes to see any livestock remotely short of water.

http://www.peta.co.nz/DomSalt.html

Components of a Farm Water Supply

There needs to be a Water Source (Bore or Spring),Intake (powered by pump or gravity), Storage (Tanks or Dam of adequate size), Reticulation (under ground pipes that are big enough for herd demand eg 400 cows minimum of 50mm) & Outlet (troughs....the least important component of the system).

http://www.envbop.govt.nz/Factsheets/LandManagement-090526-Factsheet06.pdf

The pump (head) & the pipe size are critical to good water flow. Even if a pressure unit is put onto an existing water supply there is only a certain amount of water that can flow thru any given pipe diameter.

A loop line is much superior to a main line system.....it affects the total cost & importantly water troughs can be placed either above or very close to the pipeline. This minimises the short piece of pipe (less than 1 metre) of smaller diameter leading to the trough valve. Use full flow valves that are built for purpose.
There are some legal requirements that chould be checked .....mainly related to non return valves & the protection of pipes.

In the UK dairyfarmers have in the past relied on "Town or Mains Water" for stock water requirements but on most pasture based dairyfarms this is either inadequate or too expensive (or both). The costs of drilling for bore water are normally recouped within 2 yrs thru the savings on mains water. Once you have control over the water supply you can set up pumps, reservoirs(Normally 1 day of farm requirements), looplines & water troughs.

It also allows you to install dosetron systems for minerals & bloat treatment.

http://www.liquidminerals.co.uk/index.html

Water Requirements for Dairyfarms

Daily drinking water requirements depend on the Dry Matter% of the feed, temperatures, animal production (milk litres or growth) & stage of lactation.

There are a number of ways to calculate water requirements.

First way is that with the air temperature between 15-20 degrees C.....cows need 30-40 litres/day for maintenance PLUS 3-4 litres/per litre of milk produced.

The second method is based on the "DM intake X 6" plus 1 litre water/litre of milk produced.

Often if the diet is substantially fresh pasture then 80-90% of the water intake is via the pasture eaten. But you still need to allow for the hot dry summer peak demand day where the cows dietary intake could be mostly silage & concs.

Peak water flow rates needed on a dairy farm should be worked out on a per cow basis.

http://www.dairyaustralia.com.au/~/media/Documents/Farm/Feeding%20cows/Feeding%20Systems/Other%20Information/Estimating%20Stock%20Water%20Requirements.ashx

Milking Parlour....allow 70 litres per cow per day.

Drinking water/troughs...70 litres/cow /day (in hot weather this can peak at 140 litres/day), available in a five hour period = 14 litres/cow/hour

So an example:-

400 cows drinking 14litre/hr= 5600litres/hr flow required

To get litres/minute divide this by 60: 5600/60=93litres/minute required.

Trough size

Trough size is important for access, rather than water storage. Paddocks for a herd of 400+ cows should perhaps have 2 water troughs.

Trough size should be half the one hour demand

So our 400 cow herd needs 5600litres/hr, so the water trough capacity in each paddock should be at least 2800 litres (2 x 1400(370gals)).

Plan water requirements ahead of future development.....too often the existing water supply was barely adequate......let alone sufficient for a future expanded herd size....Go BIG is Good with Water....Think Ahead!

Please document a plan for the farm water supply so you & everyone else will know where the pipes & taps/valves are on the farm map.

Dairy Farmers Need to Regularly Test for Soil Organic Matter

Soil Organic Matter is a very good measure of how sustainable agriculture really is today.

Soil Organic Matter (SOM) is usually highest under permanent pasture & grazing. Pasture based farmers have NOT been given the credit they are due!

Pasture based dairy farming is very beneficial to the environment.

So UK pasture based dairy farmers should be measuring & monitoring SOM% in their regular soil tests. Test for SOM% every time you soil test.Organic matter is critical for soil health and for soil productivity. It:
Provides energy for soil microbes
Supports and stabilises soil structure
Increases water storage
Stores and supplies nutrients
Builds soil biodiversity
Stores carbon
Buffers chemical behaviour such as pH
But, what is it?Organic matter derives from the growth and death of organisms.

Soil organic matter is:
The living component of the soil (roots, micro-organisms, animals and plants);
Exudates from living organisms; and
Dead, decaying and highly decomposed materials.
Organic matter is constructed from cellulose, tannin, cutin, and lignin and various proteins, lipids and sugars. These are all based on chains of carbon molecules which mean that a measure of soil organic carbon can give an indirect measure of soil organic matter.Decomposed organic matter has a black or dark brown colour and will darken soil colour.How does it get into soil?Plant growth is the primary source of soil organic matter. Photosynthesis converts sunlight, carbon dioxide and water into plant material. On death, the plant material is steadily decomposed and progressively incorporated into the soil. What is its fate in soil?Organic matter is a dynamic component of soil. Plant and animal debris is regularly added and carbon dioxide is routinely lost as soil organisms use organic matter as an energy source. This is the soil carbon cycle. If the rate of incorporation is low, or the rate of respiration is high, soil organic matter levels will decline. Thus the level of organic matter in soil is dependant on the balance between inputs and losses of soil carbon.Soil organisms rely on organic matter as their food source. In doing this some of the carbon chains of the organic matter are converted to carbon dioxide (termed respiration). Organic matter is consequently decomposed. How is it measured?

The amount of organic carbon present in the soil is used to estimate organic matter. Various experiments have shown that organic matter contains about 58% carbon. On this basis, the following relationship can be used to estimate levels of organic matter.
Organic matter(% by weight)
=
Organic carbon(% by weight)
X
1.72
Why does it matter to soil health?

The primary value of organic matter to soil health is in providing the mechanism for fuelling the soil with energy and nutrients. It provides a reservoir of metabolic energy that enables biological processes to occur.As plant remains steadily decompose in this part of the carbon cycle, secondary benefits occur. Nutrients are mobilised, soil mixing occurs, and soil structure is improved and strengthened as decomposition products adhere to physical soil particles and build aggregation.

Every tonne of Carbon in the soil is equivalent to 3.67 tonnes of CO2.

Soil Organic Matter is 58% Carbon.

On a well managed dairyfarm pasture (say 10% SOM) every hectare contains approx 260 Tonnes of Carbon in the top 30cm of soil.(Assuming a bulk density of 1.5Tonnes per cubic metre of soil). The International soil carbon stocks are measured to an agreed (IPPC) depth of 30cm.

The UK like every other country MUST protect & maintain (if not increase) their "Carbon Stocks". So Soil Carbon is vitally important.

Pasture based dairy farming is crucial to a future healthy environment.

Total C fixed through photosynthetic processes in pasture plants equates to approximately 40% of total dry matter (DM). In a pasture with an annual yield of e.g. 10t DM ha-1 yr-1 (i.e. 10t DM harvested as intake by animals), the amount of C harvested is therefore c. 4t C ha-1 yr-1. The total amount of C fixed from the atmosphere in photosynthesis is considerable, and has been measured e.g. as c. 16t C ha-1 yr-1, of which some 40-50% (6.4-8t C ha-1 yr-1) is returned to the atmosphere in plant respiration. This includes the respiration involved in the synthesis of shoot and the maintenance of shoot tissues. This figure also includes respiration from the synthesis and
maintenance of roots (some of which is expended via the shoot). Of the remaining c.8t C ha-1 yr-1 in new shoot and root tissues, only about 50% is typically harvested (hence the 4tC ha-1 yr-1 harvested), and the remainder of the plant tissues turnover and senesce to form shoot and root litter. Shoot and root litter contribute C ultimately to either respiration from the soil (and soil surface), from the microbes that consume the litter, or contribute to a potential increase in C sequestered in the soil.
Management (both fertiliser inputs and/or changes in grazing intensity) alter all of these fluxes. In general, increasing the intensity of utilisation (e.g. increasing stocking rate per se) will reduce all the fluxes, simply because it reduces vegetation cover (leaf area and so photosynthesis) although there is an optimum grazing.
Why Soil Organic Matter matters
Soil organic matter contributes to a variety of biological, chemical and physical properties of soil and is essential for good soil health.
Soil health is important to optimise productivity in agricultural systems.
Healthy, productive soil is a mixture of water, air, minerals and organic matter.
In turn, soil organic matter is composed of plant and animal matter in different stages of decay, making it a complex and varied mix of materials.
Functions of soil organic matter
Soil organic matter (SOM) is a key indicator of soil health because it plays a role in a number of key functions. These functions can be divided into three types:
biological functions of SOM
-provides nutrients and habitat for organisms living in the soil
-provides energy for biological processes
-contributes to soil resilience (the ability of soil to return to its initial state after a disturbance, for example after tillage).
chemical functions of SOM
-measure of nutrient retention capacity
-provides resilience against pH change
- main store of many key nutrients especially nitrogen and potassium.
Soil organic matter is a key indicator of soil health because it plays a role in a number of key functions.
physical functions of SOM
-binds soil particles into aggregates improving soil structural stability
-enhances water holding capacity of soil
-moderates changes in soil temperature.
There are often strong interactions between these different functions. For example, the biological function of providing energy that drives microbial activity also results improved structural stability and creates organic materials that can contribute nutritional capacity and resilience to change.
Optimising the benefits of soil organic matter
Managing soil organic matter for a maximum contribution to soil health and resilience can present a conundrum.
Decomposition and mineralisation of organic matter are required for functions such as provision of energy and nutrients. However, the maintenance or increases in organic matter help to maintain its positive effects on soil chemical and physical properties.
So, when managing soil organic matter the never-ending turnover and the need to replace and rebuild is a constant demand of good agricultural practice.
When selecting management scenarios to optimise the benefits of soil organic matter the following needs to be considered for each particular site:
- what are the most important functions that organic matter provides?
- how big is the contribution of organic matter to soil health and resilience?
Management actions that optimise the provision of these functions and maintain the contribution to soil health and resilience will ensure maximum benefit from soil organic matter.
How can we maintain or improve SOM% under dairy cow grazing in the UK?
1. Maintain permanent pastures
2. Minimize cultivation & use direct drill technology
3. Reduce Soil compaction & encourage earthworms
4. Return stored slurry to all pastures
5. Increase pasture production & the clover content & deep rooting grasses
6. Ensure sufficient S & P fertilizers are being used
7. Consider deferred pasture/sabbatical farming options including the USA concept of “Tall Grazing” at least on parts of the farm each year.
8. Soil test regularly (same time each year) & monitor SOM%.