Weed control

A method for weed control, comprising:

• a deposition stage;
• and
• a barrier layer stage subsequent to the deposition stage;
• the deposition stage comprising:
• providing a product comprising processed organic material on soil and leaving the product on the soil, wherein the soil hosts weeds, wherein the weeds comprise one or more of Giant hogweed and Asian knotweed, wherein the processed organic material comprises one or more materials selected from the group consisting of proteins, carbohydrates, and lipids, wherein the processed organic material comprises at least 35 wt. % rapidly degradable organic material, wherein at least 100 grams of carbon per m2 soil is provided by the product on the soil, and wherein at least 500 gram of rapidly degradable organic material is provided per m2 on the soil;
• and wherein the for the rapidly degradable organic material applies that:
• if the rapidly degradable organic material is mixed in the soil (40) and maintained in the soil under standard conditions of 20° C. and 10%-25% moisture, then at least 90 wt % of the processed organic material is degraded by micro-organism in the soil within three month;
• the barrier layer stage comprising:
• providing an oxygen barrier layer on the soil with the product provided thereon and leaving the barrier layer on the soil for at least 4 months, wherein the oxygen barrier layer has an oxygen transmission rate (OTR) value equal to or lower than 1000 ml of oxygen per m2 per hour;
• wherein the product is not actively mixed in the soil prior to providing the oxygen barrier on the soil.