English to Polish Other Agriculture renewable energy

Dzień dobry,
Z informatora o produkcji biogazu w rolnictwie ekologicznym.
W kilku miejscach pojawia się właśnie "conservation material" itp., przykłady:

"No food competition when using legumes, catch crops, conservation material, residues and by-products as biomass sources" (jako korzyść płynąca z produkcji biogazu)

"Biomass used for biogas generation mainly originates from organic agriculture, organic food production and nature conservation material."

"Types of substrate include mainly catch crops, residues from animal husbandry or crop production, material from conservation areas and/or uncontaminated biological residues (that means free of GMO and problematic levels of heavy metals) from food processing or household waste."

"Competition with food production must be avoided; major inputs are farm residues and plant material from nature conservation areas."

Z góry dziękuję za pomoc.