Presentation 2 Subsoiling and Soil Management. Dick Godwin
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1 Presentation 2 Subsoiling and Soil Management Dick Godwin
2 Outline Effects of structural damage Yield Tillage Runoff/Erosion/Flooding Assessing structural damage Repairing structural damage Moling and Subsoiling Aftercare Controlled traffic Lower Ground Pressure Concluding comments
3 Cost of soil degradation in England and Wales The assessment explored the total costs of soil degradation: The total quantified costs of soil degradation are estimated at between $1.5 bn and $ 2.0 bn per year. Compaction and loss of soil organic content account for 39% and 45% respectively of annual costs. Silts and sands account 67% of total estimated erosion costs, and clays and sands for 91% of compaction costs. Almost 80% of total quantified costs occur offsite. In terms of soilscapes, arable farming accounts for over 70% of erosion and compaction related costs. Defra Report CTE0946 by Cranfield University, 2011 Spatial distribution of predicted probability of compaction
4 Relationship between maize silage yield and soil bulk density (Quebec) 12 Sandy loam soil Dry matter yield, t/ha % Soil dry density, t/m 3 After: Negi et al, % at c. $1200/ha* = $180/ha 1.7 t/ha (dm) at $130/t** = $220/ha * Nix, 39 th Edition **IGER Date???
5 Relationship between draught force and soil bulk density Draught force, tonnes 250% increase or 60% reduction Sandy loam soil Blade Tine Soil Dry Density, t/m 3 After: Godwin, 1974
6 Traffic control effects on energy/costs requirements (kwh/ha) ( /ha*) *After: Nix 43 rd Edition (2013) c.25p/kwh at 65% Tractive efficiency (Innes and Kilgour, 1980) No traffic Trafficked Shallow plough 13 ($8) Shallow plough 32.5 ($21) A 60% reduction After: Chamen, 1992 Harrow 7.0 Spring tine 16.0 Drill 7.5 Power Harrow 30.0 Roll 7.5 Harrow 8.0 Drill 8.6 Roll 8.4 TOTAL 22 ($15) 71($50) A 70% reduction
7 A serious problem Runoff Erosion Poor Drainage Flood Management Soil condition can radically affect rate of overland flow and can exacerbate surface water flooding, Richard Smith, EA Poor soil condition is widespread in South West, Richard Smith, EA Soil loss no protection 3-5 t/ha/year - Soil regeneration 1 t/ha/year Drainage installation 1980 ~ 150,000 ha/year - Now 5,000 ha/year 40,000 homes and 7,000 businesses in Severn region were affected by flooding in June-July 2007
8 Relationship between compaction and infiltration rate After: Chyba, Soil Density g/cc
9 Infiltration ~ soil type Main factors affecting infiltration Soil type Vegetation/surface cover Infiltration rate (mm/hour) 4, ,5 30 3,0 25 2,5 20 2,0 15 1,5 10 1,0 5 0,5 Sandy loam Loam Clay loam 0 0, Time (hours)
10 Infiltration ~ surface cover Infiltration rate mm/hr 150 2, ,0 90 1,5 60 1,0 30 0,5 Old permanent pasture or heavy mulch 4 to 8-year old permanent pasture 3 to 4-year old permanent pasture lightly grazed Permanent pasture moderately grazed Hays Permanent pasture heavily grazed Strip-cropped or mixed cover Weeds or grain Clean tilled 0, Time (min) Bare ground 10
11 Effect of infiltration rate on runoff Parrett and Tone Catchment, Haselbury Plucknet/Chiselborough 6 Rainfall and runoff rates (mm h - 1 ) Rainfall ^ q poor =1.6 ^ q good =1.23 Rainfall ^ ^ q poor = Peak runoff (mm h ^ - 1 ) q good = Peak runoff (mm h - 1 ), 4-8 mm/hr q poor =3.3, 1-4 mm/hr % Reduction in peak flow 25% 23% 21% 19% Rainfall q ^ good =2.6 ^ q poor =1.7 ^ q good =1.35 Rainfall ^ q poor =0.89 q ^ good = rd December 24 th December 25 th December After: Godwin and Dresser, 2003 From: Schwab et al., 1993
12 Assessing soil structure What is soil?
13 Root development
14 Evaluation of structural damage Profile pit Penetrometer Electromagnetic Induction Conductometer 0.3m and 0.9m ranges
15 Assessing soil structure Source: Chamen, 2011
16 EMI survey data. (After: Smith, 2001) Before sub-soiling After sub-soiling Gateways Compaction
17 Wheel traffic Chamen, 2015
18 Comparison of forage chopper harvester and round baler traffic 63.8% and 63.4% respectively
19 Subsoiling Plain tine Wide point, high lift wing Narrow point, low lift wing After: Spoor and Godwin, 1978
20 Soil looseners Chisel tine (Shakerator) Conventional Subsoiler Low lift wings + leading disc Paraplow High lift Winged Subsoiler Moleplough
21 Soil failure Herringbone cracks Horizontal cracks After: Spoor and Godwin, 1978
22 Mole plough & Herringbone cracks
23 Hydrograph of mole drain discharge with leg fissures Flow rate, ml/s Rainfall, mm Hydrograph of mole drain discharge without leg fissures Time, h After: Leeds Harrison, Spoor & Godwin, 1982
24 Subsoiler Draught Force. v. Depth Subsoiling after rubber tracks at 350mm 88hp Subsoiling after tyres at 450mm 240 hp 63% Reduction After: Ansorge and Godwin, 2007
25 Tractor Implement Matching Track-laying tractors, of similar power pull 50% more tines at the same depth or tine depth can be increased by up to 20%.
26 Double pass system 1 st Pass d 2nd Pass d 4d 2d Godwin and Spoor, 2015
27 In field evaluation of effective loosening Visual evaluation need not be conducted in every field if soil types and conditions are similar. The visual assessment of surface level provides a simple guide as to the appropriateness of tine spacing. If the surface elevation appears to show distinct heave then tine spacing is too wide. An even lifting of the soil surface usually indicates a uniformity of loosening and porosity increase. Godwin and Spoor, 2015
28 In field evaluation of effective loosening The following procedure has been found to be effective: 1. Observe the soil flow and surface level during and after a short test run. Where the whole soil area between adjacent tines lifts uniformly, soil breakout at depth is likely to be fairly complete. 2. Excavate a trench across two tines or more to below their working depth. Facing the direction of implement travel, the disturbed soil can be pulled away from the face with a spade to expose the limits of soil disturbance. 3. Following any adjustments, repeat the run, making surface observations as before. Checks on any new disturbance boundary at depth can be made by pushing a rod or penetrometer into the loosened profile. 4. Use a crow bar or fencing stake to partially take the weight of the leg whilst sliding the tine along the toolbar. 5. This process is repeated until the implement setting appears correct, after which a final trench excavation is made for confirmation of the result. Godwin and Spoor, 2015
29 Subsequent traffic can destroy good loosening! Penetration resistance, MPa 0,000 0,500 1,000 1,500 2,000 2,500 3,000 3, "As found" After subsoiling Depth, cm Large tractor Large + medium tractor Tracked tractor TT + medium tractor After: Chamen 2011
30 Issues of aftercare A single mouldboard ploughing operation, can re-compact the soil to a greater density than before loosening. To overcome this:- 1. Adopt a single pass system: deep loosening + surface cultivation + drilling where the seed is dribbled down within the working width of the subsoiler. 2. As soil loosening after mouldboard ploughing is not an easy operation use a mouldboard plough fitted with under-buster tines. Other alternatives are to: 1. Reduce the weight and inflation pressure using low ground pressure systems, or 2. Restrict field traffic to pre-determined lanes within the field, controlled traffic.
31 Random Traffic Problems Extensive areas of the field are exposed to trafficking Random Traffic + Plough = 85% covered + Minimum Tillage = 65% covered + Direct Drilling = 45% covered Wheat, Czech Republic straw baling straw carting grain carting Potatoes, UK Kroulik, M., 2012, Sabbatical Study at Harper Adams University,
32 + Simple + Cheap Lower Ground Pressure: Tyres and Rubber Tracks + Less working time and improved fuel economy, trafficability and manoeuvrability - Pressure is applied (but lower) Extra costs tyres Tractor hp : Ultraflex tyres extra = $1.5/ha Combine: Ultraflex = $0.75/ha Price offset by fuel savings (c.20%) Personal communication: Mozziconacci, Michelin Extra costs tracks Combine: + $5 to $6/ha for 5-7 year life Price offset by improved trafficability, narrower operating widths & operating up and down hills Personal communication: Tyrell, Claas UK
33 Whole Machine Comparison 11 t ` 30 t 33 t
34 Sub-soil Pressure at 0.3m deep Challenger 765C 16t MF 8480 Tractor 12.2t 0,6 Pressure (bar) 0,5 0,4 0,3 0,2 Front/Rear MachXbib Low 0.7/0.7bar MachXbib High 1.2/1.5 bar Axiobib Low 0.7/0.7bar Axiobib High 1.2/1.5 bar Challenger 0,1 0 Front Axle Time Rear Axle Smith, E., Misiwicz, P. A., White, D. J., Chaney, K and Godwin, R. J., 2013, Effect of traffic and tillage on soil properties and crop yield. Paper No , ASABE International Meeting, Kansas City. Human walking
35 Controlled Traffic Farming Track width ü Simple concept ü Soil structure ü Infiltra/on + 400% ü Crop yields CTF (+LGP) = +10 to 15% yield ü Fuel,.me and machinery cost savings 70% reduc>on between trafficked & untrafficked ü GPS guidance and steering X Track width and harvester width matching Base module Chemical application: integer multiple of base module Source: CTF Europe
36 Traffic and Tillage Systems Study Aim: To compare the effects of alternative traffic and tillage systems on crop yield, energy and economics, water holding and infiltration rates over an extended period circa 10 years. Ø 3 x 3 Factorial Ø 4 blocks Ø 9 treatments 80m x 4m Ø Long term trials 10 years+ Ø Prepared site Tillage... Random High Pressure Traffic Controlled Traffic Random Low Pressure Traffic Conventional Conventional Conventional Minimum Minimum Minimum Direct drill Direct drill Direct drill Smith, E., Misiwicz, P. A., White, D. J., Chaney, K and Godwin, R. J., 2013, Effect of traffic and tillage on soil properties and crop yield. ASABE International Meeting, Kansas City.
37 RTF Deep Tillage RTF Shallow Tillage RTF No-till Tillage LGP Deep Tillage LGP Shallow Tillage LGP No-till Tillage No-till had a problem in wheel marks in all traffic systems CTF Deep Tillage CTF Shallow Tillage CTF No-till Tillage Drilled late (November 9 th 2012) into wet soil with disc drill Winter wheat 29 th May 2013 After: Smith, Misiewicz, Chaney, White & Godwin, 2013
38 Tillage v Traffic Study Winter Wheat Yield Combine harvester results (Estimated) 19% (1.39t/ha) increase in yield. 10% lsd = 0.6t/ha No-till Tillage system After: Smith et al., 2014
39 Tillage and Traffic Study Winter Wheat Yield Hand Sample Results Yield t/ha 12 10, ,97 7,69 8,10 8 7,04 6 4, Deep Shallow No-till Zero Untrafficked Wheelways Untrafficked yields significantly higher than wheelways (p<0.05)
40 CTF can make a difference to soil structure After: Chamen, 2011 Zero traffic for 15 months 2 passes post harvest 3 passes post harvest
41 Concluding remarks Ø Ø Ø Compaction Can reduce yield by 10-15% Increases tillage energy, time and costs by % Reduces infiltration by and hence increases runoff and flooding Improved soil and water management is achieved by Reducing contact pressure, and Reducing traffic intensity These costs are small in comparison to the potential economic benefits Ensure adequate drainage Remember prevention is better than cure However, if all else fails equipment/techniques are available to alleviate compaction But take care on freshly loosened soil as it is vulnerable to recompaction.
42 Final Reflection Man has only a thin layer of soil between him and starvation. Anonymous The nation that destroys its soils, destroys itself. F. D. Roosevelt There can be no doubt that a society rooted in the soil is more stable than one rooted in pavements Aldo Leopold To forget our soil is to forget ourselves Ghandi r.godwin@iagre.biz
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