Crop Protection and Floating Row Covers

Floating row covers (FRC) are lightweight thermalbond or spunbond polypropylene nonwovens (10–50 g/m²) laid directly on crops or supported by hoops, providing frost protection (−2°C to −5°C depending on cover weight), wind protection (wind speed reduction 40–70%), and insect exclusion simultaneously. Light transmission of 70–85% PAR (20–25 g/m² cover) minimally impacts photosynthesis. Temperature increase under 17 g/m² cover is 1–2°C ambient; 30 g/m² provides 3–4°C protection. Water vapour permeability of 300–800 g/m²/24h (ASTM E96) prevents fungal disease accumulation under covers. Spunbond PP covers withstand 3–5 seasons with careful handling; needle-punched covers last 1–2 seasons. Harvest net fabrics (HDPE, 100–250 g/m², green or black) are installed under fruit trees (stone fruit, apples) to catch mechanically harvested fruit, reducing bruising damage by 40–60% and harvesting labour by 30–50%. Anti-hail nets (HDPE monofilament, 80–180 g/m², 3×5 mm aperture) intercept hailstones above 10 mm diameter reducing crop damage losses of $500–2,000/ha to below $100/ha in hail-prone regions of France, Italy, and Argentina.