The way in which a pesticide is leached from a granular formulation differs from the way in which it is leached from a spray or dust formulation. This difference arises because granular applications do not provide the uniformity of coverage of the soil surface attainable with applications of finely divided sprays and dusts. This means that, besides the climatic factors such as temperature and quantity and intensity of rainfall that affect leaching, with granular formulations the distribution of granules over the soil is equally important. Thus the quantity of pesticide applied, the granule size, the pesticide content of the granules and their density may all affect the rate at which a pesticide is leached from the formulation. The inter‐relation between these factors has been considered theoretically and the theoretical conclusions have been tested using granules prepared by agglomeration and containing the herbicide ‘Prefix’ (2,6‐dichlorothiobenzamide). The effect of solubility of the pesticide in water has been studied using various pesticides having a range of water solubilities. As expected, the results show that the rate at which the pesticide is leached depends upon its solubility, but that the extent to which the granules break down under the influence of water can also be important.
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Furmidge et al. (1966) studied this question.