Method and system for delivering biodegradable shelled portions

A method of delivering shelled portions containing effective ingredients, over the air to a target, the method comprising:

• loading the required effective ingredients onto a vehicle in the form of shelled portions selected to have a type and size based on mission parameters and physical data of a scene containing the target;
• conveying the shelled portions in the vehicle to a delivery point, based on the mission parameters and the physical data;
• and
• ballistically delivering the shelled portions from the vehicle towards the target,
• wherein the shelled portions comprise the effective ingredients covered by flexible biodegradable shells, and
• wherein each of the biodegradable shells comprises:
• a first layer comprising polysaccharide at a weight % of up to 50% and a polymer matrix, the first layer being configured to form a water barrier when in contact with water;
• a second layer comprising a polysaccharide at a weight % of at least 40% and a polymer matrix;
• and
• a third layer comprising polysaccharide at a weight % of up to 50%, a polymer matrix and an additive configured to accelerate disintegration of the polymeric shell when exposed to natural day light, the third layer being configured to form a water barrier when in contact with water.