Integrated pest management is a technique in which gardeners and farmers use a co-ordinated system of tactics and tools to overcome pest threats. Along with the techniques outlined above there are cultural techniques, what the gardener does with his/her tools and time.
One technique is to lay a tarpaulin or carpet overnight. The slugs will gather under this and in the morning lift it to pick them up. This tactic works best when you can throw them to the ducks or otherwise dispose of them, maybe by chopping them in half. Their bodies can be left on the compost heap or left out for birds.
Prevention is better than cure, and so it is considered good practice to maintain the garden so that debris and detritus is not left lying around, for slugs like to hide underneath it. You cannot eliminate all places in which slugs can hide, but you can minimize them.
When digging if you uncover small white eggs collect them and either drop them in water or place them on the bird table, where they will play their part in the cycle of nature, feeding avian predators.
There is discussion about gritty materials and their ability to deter slugs. I have applied some potash from the woodfire and have had no slugs on the area, though I also have wool pellets as well, so it is hard to say. Some gardeners strew crushed egg shells around the plants to be protected, but this has not always been considered effective and rats like licking the insides of shells that contains egg residue.
Copper strips at the entrances to garden buildings are said to deter slugs, as their slime reacts with the copper to produce a slight electrical current, which gives them a shock. However, I tried this technique in the kitchen of my previous house, but it did not work well.
Pouring salt upon slugs kills them quickly, but in large quantities it does not do your garden any good and it is better used on patios.
Sadly slugs and gardeners are enemies, and if left alone the slugs will strip your food crops bare, and the implication of this is that if we want to have food we have to suppress slugs. Even the most dedicated vegetarian gardeners need to deal with the slug problem. Dealing with pests is not the nicest side of gardening, but it is a necessary process.