M-0801E
Sandbox for pF-determination
Eijkelkamp Soil & Water
Nijverheidsstraat 30, 6987 EM
Giesbeek, the Netherlands
T +31 313 880 200
E [email protected]
I www.eijkelkamp.com
© 2019-01
Meet the difference
User manual
Page 1: ...E Sandbox for pF determination Eijkelkamp Soil Water Nijverheidsstraat 30 6987 EM Giesbeek the Netherlands T 31 313 880 200 E info eijkelkamp com I www eijkelkamp com 2019 01 Meet the difference User...
Page 2: ...ndix 2 Description of different pF sets 22 Appendix 3 Conversion factors 23 Appendix 4 Soil sampling 24 References and literature 25 Nothing in this publication may be reproduced and or made public by...
Page 3: ...o plants Results of measurements taken with this sandbox correspond with points on the drying curves of the relevant samples associated with decreasing pressure These pressure values are usually stand...
Page 4: ...r 0 1 bar pF 0 pF 2 0 Reading accuracy 0 0001 bar Fig 1 Assembled sandbox with numbered components 7 6 8 Tap B Tap C Tap A 14 4 3 10 12 11 9 13 5 1 2 Backside of sandbox Tap D 1 Box 2 Box frame 3 Box...
Page 5: ...th filter cloth The supplied filter cloth has two layers and is 6 cm wide The plastic drainage pipe needs to be covered by 3 layers of cloth to disperse the suction and to stop sand from blocking the...
Page 6: ...utive winding covers two thirds of the width of the previous one This will ensure that the entire pipe is covered by three layers of filter cloth Fig 5 7 Fasten the cloth at the other end of the pipe...
Page 7: ...ir 12 to the box 1 using the two bolts provided Fig 8 4 Allow the outflow pipe 13 from the suction regulator 11 to hang from the table into a bucket Fig 9 5 Boil 8 litre of deminineralized water and f...
Page 8: ...the supply tap B On Fig 11 9 Turn tap A on the front of the box to Supply and allow water to flow from the supply bottle 6 into the box 1 until the box is half full with water Fig 12 10 Turn tap A to...
Page 9: ...t the suction regulator 11 to its lowest position max suction near the bucket Fig 15 16 Turn tap A to Discharge and allow water to flow from the box 1 through the suction regulator 11 into a bucket un...
Page 10: ...e easily poured into the box 1 For the textural composition of the sand see Table 1 Table 1 Textural composition of synthetic sand Particle diameter m Percentage occurence 106 0 75 6 3 63 61 4 53 22 1...
Page 11: ...of the plastic drainage pipe or about 6 5 cm below the rim of the box 1 Fig 22 There must be at least 6 cm of space between the sand and the top of the box to place the soil sample rings under the li...
Page 12: ...and with a piece of fully saturated protection cloth 29 Disperse any air bubbles between the protection cloth and the sand by gently smoothing from the centre outwards Fig 26 30 The middle of the soil...
Page 13: ...fore water retention values 1 See Appendix 4 for how to take a proper soil sample 2 Uncap the core sample ring If the sampled soil volume is larger than the volume of the core ring carefully remove ex...
Page 14: ...level will entrap air and may damage soil structure Fig 33 7 Turn tap A to the Closed position when the water level is 1 cm below the top of the sample rings Fig 34 8 Place a lid on the basin to preve...
Page 15: ...s difficult to transfer the saturated sample to a balance without changing water content especially with sandy samples The middle of the soil sample is used as the reference level for zero pressure bu...
Page 16: ...the filter cloth just clean and smoothen it at the same time to remove air bubbles and impressions Fig 40 18 Replace the soil samples on the sand at exactly the same position as they were previously...
Page 17: ...17 6 Table to be filled in as measurements are taken...
Page 18: ...sand is completely saturated and that it is forced into the corners and against the walls of the box 4 There is a leaking cock tap 4 Order a new cock tap 8 Maintenance of suction tables To prevent por...
Page 19: ...content at pF 4 2 The A horizon has a moisture content of 8 at PWP and the C horizon 4 Porosity In a sandy soil all pores are filled with water at saturation pF 0 and empty when oven dry pF 7 Therefor...
Page 20: ...pores are emptied more gradually in the A horizon corresponding to a heterogeneous pore size distribution The C horizon contains a relatively large amount of pores of similar size which are all draine...
Page 21: ...F 2 0 the A horizon will contain 35 volume of water At the permanent wilting point pF 4 2 the A horizon will contain 8 volume of water As 1 volume corresponds to 1 mm water per 10 cm of soil the amoun...
Page 22: ...m suitable for 5 cm diameter core rings Omega ruler A Sand kaolin box for pF determination pF2 0 2 7 The standard set art no 0802SA for about 40 samples includes Sand kaolin box Suction level control...
Page 23: ...0 cm pressure head 100 cm water column 0 1 bar 0 01 Pa 0 01 N m 1 45 PSI pF 10log100 2 0 pF value Matric potential in hPa Pressure in bar 0 1 0 001 0 4 2 5 0 0025 1 0 10 0 01 1 5 31 6 0 0316 1 8 63 1...
Page 24: ...Water recommends the use of a 100 cm volume core ring with an inner diameter of 50 mm outer diameter 53 mm and a height of 51 mm When pressing the core rings into the soil care should be taken not to...
Page 25: ...cteristic IN Soil Analysis Physical Methods K A Smith and C E Mullins eds 1991 Van Reeuwijk L P ed Procedures for soil analysis 1995 ISRIC Wageningen Stakman W P G A Valk and G G van der Harst Determi...
