Disclosed is an agrochemical delivery unit comprising an impermeable cell which is a cell made of material that is impermeable to water； an agrochemical within the impermeable cell； and a wick comprising a hydrogel, said wick having a portion located within the impermeable cell and a portion located outside of the impermeable cell. Also disclosed is an agrochemical delivery unit comprising (a) a cell comprising two or more cell wall segments wherein at least one segment is impermeable to water and at least one segment is permeable to water； and (ii) an agrochemical within the cell. The invention provides methods of making and using the units.
