Comparative Performance of Different Plastic Films for Soil Solarization and Weed Suppression

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Abstract
Soil solarization is an important practice for small-acreage farmers and home gardeners and is used commercially in areas with high solar radiation and air temperature during the summer. In this technique, clear plastic films are used to increase soil temperature to manage soil-borne plant pests such as insects, diseases, nematodes, fungi, and weeds. Several different kinds of plastic films were evaluated in 2007 and 2008 for durability, weather tolerance, and weed suppression. Treatments were arranged in a randomized complete block design with five replications. In 2007, treatments were four clear plastic films including: ISO, VeriPack, Poly Pak, Bromostop®, and a white plastic control. In 2008, treatments were Polydak®, Poly Pak, Bromostop®, and white plastic. Films were evaluated for weed suppression based on the population density of weeds that emerged through breaks in the plastic, for durability in terms of number and size of breaks in the films, and for the total exposed soil area resulting from breaks. Purple nutsedge (Cyperus rotundus) was the major weed problem throughout both years. In both years, total exposed area was greater with white plastic and Bromostop® (81.5 ft2/bed) compared with other plastic films (2/bed). Due to their durability, Poly Pak, ISO, and VeriPack suppressed nutsedge more than Bromostop and white plastic. Although a number of very small (<0.75 inch long) breaks were observed in Polydak® plastic film, they never increased in size, and this plastic film remained intact throughout the experiment and provided excellent weed control.

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