Development of a sprayable and biodegradable coating system as an alternative to plastic mulching during anaerobic soil disinfestation in open field applications
During anaerobic soil disinfestation, oxygen barrier foils are used to maintain low oxygen levels of less than 0.5% in the soil. To overcome wind problems using foils, a biodegradable sprayable coating and application technology were developed and tested in 2014. Instead of removing foils, the coating can be applied on top of the soil and be incorporated into the soil avoiding waste issues afterwards. Results of the barrier coating and application technology development were tested in both lab and field trials aiming for at least three weeks of reductive conditions. Challenges are obtaining retarded biodegradation of the coating on top, the preparations, and recipe of high solids coatings, and to combine it with existing application techniques like spade injectors. Results of the first small test in 2014 resulted in more than six weeks reductive soil conditions under wet conditions. In 2016, an Imants spade injector was modified to apply the coating in two field tests at compressed soil in a research program with Wageningen University. The system appeared to be working but sensible to cracks in the swollen soil, which was stressed too much due to rolling. Rainfall relaxed the soil after a few days. Development will be continued.
Meints, H. (2020). Development of a sprayable and biodegradable coating system as an alternative to plastic mulching during anaerobic soil disinfestation in open field applications. Acta Hortic. 1270, 183-192
ASD, foil replacement, biodegradable barrier coating, oxygen barrier coating