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Case Study 12 - Plough based system, sandy soils
Location Nottinghamshire
Size, average field size and spread 135ha
Soils and landscape Soils are generally deep permeable well-drained and sandy (Cuckney association) with shallow soils over soft sandstone on steeper slopes (Bridgnorth series). Sandy soils suffering seasonal wetness flank the water courses (Blackwood association).
Cropping The typical rotation is cereals (first wheat/barley followed by second cereal winter barley 60ha) followed by peas or a root break crop of potatoes (20 ha) or sugar beet (20ha). Approximately 10ha of the farm is in rotational or permanent set aside with Miscanthus, and approximately 10ha is rented to carrot and onion growers. Sixty beef cattle are kept on 15ha of permanent grassland and these are finished indoors.
Workforce The farm is run by a manager and a staff of five who are also involved with experimental work.
Equipment and cultivation machinery

Four tractors 110hp, 95hp, two 85hp all approximately 5 years old. Doweswell 4 furrow plough, Furrow press and 4m Nordsten drill and Ransom subsoiler.

Cultivation Policy

The plough and press have traditionally been the main tools used in seedbed preparation. Drilling is directly into pressed land, which aids water conservation and minimises wind erosion. The number of machinery workdays is high in autumn and spring, with soils draining quickly enabling most operations to take place when soil is within a few days of field capacity following heavy rainfall. Land going into root crops is left in stubble and old tramlines are used to spray weeds off with glyphosate. Low-pressure tyres are used for spring spraying. Subsoiling is carried out on headlands and down tramlines before a root crop. Stubble is cut at approximately 10cm and all straw is baled for the farms’ own use or sold for over wintering carrots. Slurries and manures from the livestock are spread onto cereal stubbles post-harvest or applied to land following sugar beet in January and February and ploughed in. Irrigation is necessary for potatoes, carrots both receiving 200 to 300mm (8 to 12'') per annum and sugar beet about 100mm (4'') per annum. Sugar beet drilling and harvesting is contracted out.

 
  Crop sequence          
Operation Cost £/ha Output ha/hr Root crops Cost £/ha Output ha/hr
 
Subsoiler 35 1.3 Plough and press 39 1.0
         
Plough and press 39 1.0 Bedforming 30 0.8
         
Drill 19 2.0 Stone separator 130 0.4
         
Cambridge roll 9 4.0 Potato planting 2 row 50 0.4
         
Spraying 8 6.3 Spraying 8 3.8
 
 
 
 
Discussion  
Decision to change Alternative systems of cultivation have not been considered on the farm.
How Approximately one third of the farm has vegetation cover/stubble through the autumn, winter and early spring period.
Benefits Costs are low and operations simple, vegetation cover provides protection from wind or water erosion and cover/food source for wildlife. Addition of manures assists nutrient supply and reincorporates some organic matter.
  Problems   High wear and tear on cultivation equipment due to sandy texture and stone content. Potato cyst nematode (PCN) can cause a problem with potatoes. Wind and water erosion can be a problem on these light sandy soils. Potato volunteers cause a problem in following crops. Surface conditions in these very permeable soils can be misleading after wet weather and trafficking too soon after wet weather can cause subsoil damage.
  Solutions Found  

Machinery fitter employed on the farm to maintain/repair equipment. Pressing after drilling reduces ‘wind-blow’ which can be a severe problem in this area and fields are left in stubble prior to cultivations for root crops. Rotations are being ‘stretched’ so that potatoes are now grown on a 5-7 year rotation to reduce PCN pressure. Aldicarb is applied where control problems persist. Rotation experiments are ongoing to assist control of potato volunteers, for example, potatoes, sugar beet, winter wheat, winter wheat.

 
SMI COMMENT
Ploughing is the best option for maintaining structure, optimal cost for the size and type of the farming operation and use with potatoes and sugar beet. There are good returns from renting land to high value crop (carrots/onions) producers. There is higher than average manpower due to research/trials requirements. Surface profiling could reduce erosion risks further. Leaving ex-potato ground unploughed until late winter would reduce the volunteer problem. There are adequate man-days for autumn establishment, irrespective of type of year but insufficient for spring crops in wet years. Localised damage can occur if soil is worked too soon after heavy rain.
 
Soil Group Type of Year M.W.D.s'   M.W.D.s'
Cuckney Normal
Wet
114
84
  40
19
Blackwood Normal
Wet
104
74
  30
9
Man days required for current reduced cultivation
Plough/press drill 125ha   Plough
bedforming planting
40ha roots