Innovative production systems News from hydroponical trials - - PowerPoint PPT Presentation

Symposium

Innovative production systems

News from hydroponical trials

September 25th 2019 Matthijs Blind, researcher Proeftuin Zwaagdijk (matthijsblind@proeftuinzwaagdijk.nl , +31 (0) 6 30 81 58 11)

Contents:

 Deep water culture (DWC) chrysanthemums  Hydroponics various cut flowers  Interreg project Hy4Dense  Deep water culture with high concentrations sodium (and chloride) (Project Achteroever)

Chrysanthemum (cut flower), DWC

• 2015-2017: 13 successful crop cycles

(also in summer)

• 2018/2019: start new project in

chrysanthemums and other cut flowers with financial support of:

• Landelijke gewascommissie

chrysant/ChrIP

• Stimuflori
• STOWA
• LTO Noord Fondsen

Most important results/conclusion up to now:

Potential higher yields than in soil % loss/infections minimal Several crop cycles on same nutrient solution without disinfection are possible (emission almost 0) Reuse of nutrient solution seems to be better than new nutrient solution Roots of chrysanthemums seem to be very sensitive to oxidative substances (disinfection), observed while using van chloride.

Avoid use of PVC (softening agents, stabilizers) Adding ammonium to nutrient solution  positive effect on yield (weight) Period before start of short day treatment (rooting + long days) strongly determines final result Production without any substrate is possible

Focus now:  Improving rooting and development during long-day-period, prevention of chlorosis  Up to now mainly variety ‘Bacardi’, later ‘Pina Colada’  to compare with crop at close by traditional grower  Recent variety trial: ‘Pina Colada’ and ‘Bacardi’ (a bit less) are sensitive for chlorosis  Relation with nutrition not (yet) proved

 Pythium(?): roots visual healthy, use of fungicides do not prevent chlorosis  Relation with light/radiation (intensity/DLI?), stress?  Reducing radiation/light or change to short day period  leaf colour improves rapidly  Trial: extra screen  leaf colour improves  Production system possibly more sensitive as result of reflection? (better: we again have to learn how to grow)

Soon:

 Test prototype in float integrated crop support  Further development substrate-less production  Program of requirements  design of new floats  Design of required company structure for large scale production

• Screening
• 2020: Selection 2 or 3 most promising crops
• DWC/DFT but possibly also other alternative/innovative

growing systems

• Tulip hydro trays (promising results former trials)

Other cut flowers

Tests using sowing trays Tulip hydro trays with inline fertigation Promising up to now:

• Matthiola
• Antirrhinum
• Delphinium (from seed)
• Alchemilla
• Brassica….

• Ammi
• Tanacetum (Matricaria)
• Lisianthus

Most promising crops: Trial with both a used and a new nutrient solution

Interreg 2 Hy4Dense

• Development of production system

(hydroponics) for spinach, lambs lettuce and (wild) rocket

• Start 2019
• Inagro (Belgium)
• Howest (Belgium)
• NIAB (UK)
• University of Essex
• Proeftuin Zwaagdijk

DWC of various crucifers on water with a high sodium (and chloride) concentration

Part of project Achteroever Wieringermeer (NL) (use of regions with water storage – fresh/salty water - for food production).

Commissioned by Rijkswaterstaat (Ministry) with financial support of EFRO and the Province of North-Holland, in close cooperation with Zilt Proefbedrijf/Salt Farm Texel

Analysis Calculated Surface water composition parameter unit 25-06-19 after fertilizing EC mS/cm 6.9 pH 9.5 NH4-N mmol/l <0.1 K mmol/l 1,0 8.5 Na mmol/l 47.9 47.9 Ca mmol/l 6.7 8.5 Mg mmol/l 4.2 4.2 NO3-N mmol/l <0.1 9.1 Cl mmol/l 59.8 59.8 S mmol/l 0.9 0.9 P mmol/l <0.04 2 Fe µmol/l <0.2 40 Mn µmol/l <0.1 10 Zn µmol/l <0.1 8 B µmol/l 15 50 Cu µmol/l <0.1 1.5 Mo µmol/l 0.1 1.5 HCO3 mmol/l 0.2 0.2

IJsselmeer Trial basins

Region with salinization

Indicative trial:

White cabbage : 4 varieties Cauliflower : 4 varieties Kohlrabi : 3 varieties Borecole : 1 variety Broccoli : 1 variety Swiss Chard : 1 variety Rape kale : 1 variety marrowstem kale : 1 variety

Planting: June 28th, rape kale July 8th, merrowstem kale 27 July 27th

All types and varieties developed a harvestable product

Remarkable differences in leaf colour (nutritional deficiencies?) between kohlrabi varieties

Current (demonstration) trials DWC

• Greenhouse 34: chrysanthemums (effect pH and float colour on leaf colour,

variety trial) (explanation: Matthijs Blind, +31 (0)6-30815811)

• Greenhouse 23: Screening various cut flowers like Lisianthus, Antirrhinum,

Brassica, Ammi and Campanula on DWC/DFT (and Lisianthus on Tulip hydro trays) (explanation: Matthijs Blind)

• Demonstration various crops on DWC lettuce in a tunnel (explanation Jan

Botman, Botman Hydroponics, +31 (0)6-38900656)

• Lettuce trials outdoor (Interreg Bio4Safe): effects of biostimulants on uptake
• f nutrients under suboptimal conditions (nutritional stress) (explanation:

Matthijs Blind, +31 (0)6-30815811)

Tunnel

Trial Fields

reception

Green- house 34 Green- house 23 Lettuce hydroponics (Bio4Safe)

terrace

reception

restaurant restaurant

Toilets wardrobe

Toilets Symposiums

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Thank you for your attention!