‘Drip lines’ are pipes with evenly spaced drippers seamlessly welded inside. And ‘drippers’ are the emitters that deliver mixtures of water and nutrients directly, in measured quantities and at regulated pressures, to each individual plant. If your plants are distributed evenly across your field, orchard or greenhouse, you’ll mostly rely on drip lines to irrigate and fertigate. But if you’ve got irregular spacing between your plants, you’ll likely need to place individual drippers to make sure every plant gets water and nutrients sent directly to its root zone.