FertiBioSol Project - Green Waste Shredding by MSV Normandy

Technical articles - Living soil agronomy

Market gardening Market gardening Living soil Green waste shredding Soil regeneration

As part of a previous call for projects (PEI, 2017 call for projects), three partner organizations (BioPousses, Sileban and CFPPA Coutances) organized around the SOCLE Innovation AB project to experiment with and disseminate innovative techniques adapted to market gardening and vegetable farming operations in Normandy. The objective was to provide technical and economic benchmarks on techniques for soil fertility management based on biological methods and to address the hardship mainly linked to manual weeding tasks in market gardening. The FertiBioSol project continues the work of SOCLE Innovation AB on the theme of managing biological soil fertility by proposing a broader scale of work at the farm level and adopting a prophylactic approach to pest management.

[1] Green waste shredding - page 32

Production of green waste shredding

Steps of green waste shredding :

1. Reception
2. Quality control and sorting
3. Branch shredding
4. Screening using a 0 - 115 mm mesh

Sources of green waste :

• Dead leaves
• Grass clippings
• Hedge and shrub trimmings (<20cm)
• Pruning residues
• Maintenance waste from flower beds

Characteristics of green waste compost

Humus formation for 10 dry tonnes of green waste shredding :

DM green waste shredding = 10 tonnes X K1 = 50 % = Humus 5 tonnes

Analyses of green waste shredding :

Sample		Desert vegetables	Wild seedlings
Agronomic value characterization	DM % raw	41	30.9
	OM % dry	94.8	91.4
	pH water	6.8	8
General composition	C/N total	124	83.1
	N total g/kg dry	3.8	5.5
Major elements	Phosphorus g/kg dry	0.9	1
	Potassium g/kg dry	1	15.3
	Magnesium g/kg dry	1.2	1.6
	Calcium g/kg dry	17	6.2
Isohumic coefficient K1 (%)		~ 50	~ 50

Supply in market gardening

Producers :

Neighboring farms Composting platforms (Veolia, Waste treatment syndicates) Green space maintenance companies Municipalities

The NF U 44-051 standard for organic amendments usable in ORGANIC guarantees threshold efficiency values as well as product safety (composition, pollutant content, ...)

PURCHASE COST 0 to 50 €/t depending on delivery included or not

Use

Granulometry :

Shredding from 0 to 150 mm depending on shredder and calibration screen

Logistics :

Simple spreading or with incorporation

• Manure spreader
• Spreader and manual distribution

ADVANTAGES	DISADVANTAGES
Carbon amendment Planting Mulching and mulch (depending on thickness) Surface composting	Possible presence of seeds Seeder clogging at sowing Variable composition Delay of crops

Table of quantities used

Open field area + greenhouse area (excluding walkways) = Actual cultivated area

Example farms	Trial areas (ha)	Quantity used (t/ha)	C/N	Nitrogen total (% DM)	Nitrogen value of product (kg N / t shredding)
Desert vegetables (wood chips)	0.600	320	124	0.38	1.5
Wild seedlings (wood chips + horse manure)	0.15		83.1	0.55	1.69

This article was written thanks to the kind contribution of Living Soil Market Gardening Normandy & Ile-de-France.