[PPT] - Geoff Cresswell PowerPoint Presentation, free download

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Geoff Cresswell

Cresswell Horticultural Services

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Fornes et al. AJEA 2003 43:1171-1179

750

350

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Influence of iron sulphate on media pH

y = -1.138x + 6.0975 R

2 = 0.8581

3 4 5 6 7 0.5 1 1.5 2 2.5

Iron sulphate (kg/m3) pH (1:1.5)

28-Feb 6-Mar Linear (28-Feb) Linear (6-Mar)

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Influence of Magrilime rate on pH

y = -0.0356x2 + 0.4432x + 6.3671 R2 = 0.8766 5 6 7 8 1 2 3 4 5 6 7 8 9

Magrilime (kg/m3) pH (1:1.5)

28-Feb 6-Mar

Poly. (28-Feb)
Poly. (6-Mar)

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Salinity of rinse water used to wash raw coir bark

0.5 1 1.5 2 2.5 1 2 3 4 5 6

Number of rinses EC (dS/m)

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EC of leachate

20 40 60 80 100 1 2 3

Number of leachings EC (%max)

Coir pith Coir bark Coarse Pine Bark Fine Pine Bark Buffered mix

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20 40 60 80 100

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Water holding capacity (%) Potting mix

Potting mix WHC

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Potting mix WRE Hand

20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Retained water (%)

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Potting mix wettability

50 100 150 200 250 300 350 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Potting mix Wettability (Secs)

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Height of capillary wetting front in composted pine bark mix

5 10 15 20 25 30

PM PM + ash PM + coir Height (cm)

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Potting mix AFP

5 10 15 20 25 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Potting mix AFP (%)

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Relationship between AFP and WRE

y = -2.2296x + 104.32 R2 = 0.5027 20 40 60 80 100 5 10 15 20 25 30 35 40 45

AFP (%) WRE (%)

General mixes Linear (General mixes)

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Relationship between AFP and WRE

y = -2.2296x + 104.32 R2 = 0.5027 20 40 60 80 100 5 10 15 20 25 30 35 40 45

AFP (%) WRE (%)

General mixes Coir mixes Linear (General mixes)

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Moisture retention curves

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0.5 1 1.5 2 2.5 3 3.5 4 4.5

log pressure (cm water) Water content (vol/vol)

85% pinebark/15% sand 70% pinebark/15% sand/15%coir 50% pinebark/50% coir 100% coir (50 chips:50 fines)

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Influence of coir content on drainage

y = 6.9055x + 258.87 R2 = 0.9726 250 500 750 1000 20 40 60 80 100 120

Coir (%v/v) Ksat (mm/hr)

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Water retention eficiency of potting mix blends

20 40 60 80 100 85% pine bark/15% sand 70 % pine bark/ 15% sand /15% coir; 50%pine bark/50%; coir 100% coir

WRE (%)

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Slab Flushing Trial - Reduction in electrical conductivity (EC)

1 2 3 4 5 6 7 8 Slits Cut 0 litres 2.5 5 7.5 10 12.5 15 17.5 20

Litres Irrigation applied

Electrical conductivity (dS/m)

Water Buffered

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Slab Flushing Trial - Reduction in Sodium

500 1000 Slits Cut 0 litres 2.5 5 7.5 10 12.5 15 17.5 20 Litres Irrigation applied

Concentration (ppm)

Water Buffered

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Slab Flushing Trial - Reduction in Chloride

500 1000 1500

Slits Cut 0 litres 2.5 5 7.5 10 12.5 15 17.5 20

Litres Irrigation applied Concentration (ppm)

Water Buffered

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Slab Flushing Trial - Change in pH

5.0 5.5 6.0 6.5 Slits Cut 0 litres 2.5 5 7.5 10 12.5 15 17.5 20

Litres Irrigation applied Leachate pH

Water Buffered