So I was looking at my facebook and came across this link for
an olla CLAY POT so I started looking in to olla pots and found this page showing a simple way to make one Global Buckets: Olla Irrigation.
From there site:
We’ve been inspired by Fan Sheng-chih Shu. His writings from the first century BC describe a method of irrigation where a unglazed clay pot is buried in the soil. When filled with water, the clay pot turns into an amazing high-tech device. The micro-pores of the clay pot allows water to seep into the surrounding soil. A key characteristic is that the water seepage is regulated by the water needs of any nearby plant. When the plant’s water demands have been fulfilled and the soil is moist, the water seepage from the clay pot will stop. When the soil becomes dry, water seepage will begin again. This seepage is controlled by soil moisture tension. It’s automatic irrigation without timers or electronic sensors!