Controlled release of agrochemicals

The possibility of using LDHs for the storage and controlled release of agrochemicals is another which has excited significant interest in the scientific... 

Details are given of the preparation of PVC membranes containing dialkylphthalate. The tensile strength and percent elongation of these membranes as a function of concentration of the phthalate plasticisers, their size and ageing period were performed. Applications in the controlled release of agrochemicals are mentioned. 19 refs. 

Controlled release of agrochemicals (e.g., by hydrolysis of a polymeric ester) can offer the advantages of constant level, smaller dose, reduced evaporation loss, lower toxicity, longer life, decreased environmental pollution, and reduced effect on nontarget species by wind or runoff.20 Systemic pesticides are preferred. This ensures protection of the growing tip of the plant. For weed killers, this means that it is not necessary to hit every leaf of the plant with the herbicide. Pesticides are often applied on a spray schedule according to the calendar as a prophylactic measure. Chemical pesticides are used 98% of the time. 

Besides mulch films, other potential agricultural applications for biodegradable polymers include devices for the controlled release of agrochemicals (such as fertilisers, soil applied active ingredients, insect pheromones and so on), disposable articles such as plant pots, composting containers and bags, envelopes of ensilage, seed trays and so on. 

Though the advantages of controlled release of agrochemicals are impressive, there are a few disadvantages of this technology [146,147]. 

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