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Case Study 1 - Reduced cultivation with disc harrows or direct drill
 
Location Worcestershire
Size, average field size and spread 320ha; 6.4ha with land spread over 14.5km.
Soils and landscape Heavy clay loam over dense slowly permeable red clay soils. Locally stony at the surface they are subject, in varying degrees, to seasonal surface wetness (Brockhurst and Whimple associations). Occasional steep banks are dominantly clay in texture (Worcester series).
Cropping 152ha winter wheat (milling varieties), 56ha winter oilseed rape, 72ha winter/spring beans and 40ha (permanent set aside/grass).
Workforce Managed by family labour (father and two sons) and also employs a part-time secretary and an independent agronomist.
Equipment and cultivation machinery Kuhn 4m discs; Weaving 3m ‘Sub-lift’ fitted with 5 legs; Bullock 6m Lo-Till rake; Marstig 6m folding rolls; Kuhn SD4000 4m folding direct drill; 150hp JCB Fastrac 2155 (2 years old); 130hp John Deere 6900 (3 years old); 90hp 2M-F 600 series (15 years old) tractor.
Cultivation Policy
The basic policy is to obtain a good stale seedbed, then Spray Direct-Drill
Wheat oilseed rape Oilseed rape wheat
Winter beans wheat Disc Roll;
Spring beans wheat Rake (x2);
Wheat wheat Bale straw Rake
Wheat beans Rake (?) Sub-soil (?) - Rake or sub-soiling only when necessary
Oilseed rape wheat Either Disc (x2) Roll or Rake (x2) Direct-Drill
 
  Costings and Work rates        
Operation Output (ha/hr) Cost (£/ha) Time taken (min/ha)
 
Discing 2.8 15.0 22
 
Raking 6.0 6.25 10
 
Rolling 4.0 7.50 15
 
Direct-Drilling 2.8 25.0 22
 
Sub-soiling 1.6 20.0 38
 
Spraying 10.0 7.50 6
 
 
Discussion  
Decision to change Reduction in commodity prices and area aid; problems in achieving reasonable seed beds in wet autumns (short access window); difficulty moving large machinery on busy roads & into small fields; soil erosion was becoming more of a problem.
How Change to reduced cultivations/direct drilling from a plough & power/ harrow-drill system phased in over three years (drills hired during first two seasons): a drill purchased (year 3) partly by sale of redundant equipment. Now the farm does not own a plough or power harrow.
Benefits Yields maintained on a field for field basis; overall farm output increased due to better timeliness (cultivations/spray and fertiliser applications) and better land trafficability. Improved soil structure and significant increase in worms have added to overall fertility of the soil. With the change now complete, the farm shows an overall crop establishment cost saving of > 45% and 40% saving in time. This has allowed over 120ha of contract drilling to be done, which has helped to fund the change.
  Problems   Most significant problem has been uneven spread of chaff and chopped straw behind the combine. This led to “hair pinning”, toxins from rotting crop residues and increased slug problems in the early days resulting in poor crop establishment. Some drilling days have been lost waiting for suitable glyphosate spraying conditions in a difficult autumn.
  Solutions Found   Problems overcome by use of stubble rake; a more efficient combine will be purchased in the long term. The use of glyphosate eased “Harvest Management”. Weed control has not been a problem - good stale seedbeds pre-drilling and the rotation allowed various strategies for grass weed control.
 
SMI COMMENT
Well thought out and successful; at 52min/ha as low as one could expect; rake improves combine straw/chaff spread efficiency. Problems encountered in wet years have been alleviated by adoption of a mixture of reduced cultivation and direct drilling.
 
Soil Group Type of Year M.W.D.s'   M.W.D.s'
Brockhurst
70%
Normal
Wet
45
17
  6
0
Whimple
30%
Normal
Wet
60
32
  11
0
Man days required to complete autumn cultivation
Spring Cultivations
  Wheat OSR
OSR wheat
wheat sp beans
conventional plough
Wheat OSR
OSR wheat
  (35ha)