Tag Archives: olla

FECO Water Conservation Grant – Step Three – Ollas and Perforated Pipe

March 19, 2018

Our efforts this year center on water conservation and we are attempting three different methods to deliver water to plants: gravity fed drip irrigation (coming soon), ollas, and deep perforated pipe. All of these methods will save water but they all will also minimize the time and physical effort it takes to water the plants.

Irrigating with ollas offers the following water conservation benefits:180318-sm-sue-olla-_20180318_0622

  • Less evaporation
  • Less runoff
  • Plant roots more directly targeted
  • Less over-watering
  • Promotion of deep roots
  • More consistent soil moisture

Ollas (also referred to as pitcher irrigation) are used in nearly all parts of the world and have been in use for at least two thousand years. (Research by Siyal)

Ollas are often handmade. The clay pots are porous because they are unglazed. The release of water by the pot into the soil is very low tech! When the water content in the soil decreases due to absorption by the roots and/or evaporation into the air, more water passes from the pot into the soil. The dampness of the soil stays more or less constant at all times; a huge benefit for the health of many vegetable plants.

Potters can increase the porosity of the pot by adding other materials to the clay and also by firing the clay at temperatures below 1000 Celsius.

(Note: Using liquid fertilizers in the irrigation water may cause salt build-up and clog the small pores. Hard water can cause the same problem.)

Our pots originated in Mexico and are made with Tecate clay, found in an area 25 miles wide that stretches from the Northern Baja border South 60 miles.

We have finer soil at FECO so water dispersion might tend to be more horizontal than if you had sandy soil. We loosened the soil well when we installed the ollas to eliminate air pockets.

Olla irrigation is reported to be most efficient for crops with fibrous root systems like squash, melons, watermelons, tomatoes, and chilies.

Sun, Apr 15, 2-4, Work Party
Sun, May 20, 2-4, Work Party
Sat, Jun 2, 10-12, Work Party
Sun, Jun 17, 2-4, Work Party

We also buried perforated bamboo pipes around dylan-and-pipe-wp_20180316_002the blueberries and up through the center of our new vertical garden.

We drilled a hole through each node but not through the bottom node. Then we drilled holes along one side of the pipe, for pipes buried next to a blueberry plant. Each bamboo pipe holds about 1/2 gallon of water. We buried the pipe vertical about two feet down and added a mesh screen at the opening to keep out debris.

Our hope is for the blueberry roots to reach down deep toward the water so the plant is more drought-tolerant in the summer. Perforated pipes are especially suitable for shrubs.

Our next challenge is the first part of the gravity fed drip irrigation system – the installation of 40 gallon reservoirs at each food bank garden bed.

Please consider joining us at the April work party or contact us if you can help on another date.

Ruth

garden-w-soil-and-pipe-20180319_190702_hdrother resources:

David Bainbridge, in his book Gardening With Less Water (2015), and
http://www.globalbuckets.org/p/olla-irrigation-clay-pot-system.html

New Watering System Is On Tap

October 1, 2017

It’s fascinating how one mulberry or one thornless blackberry can sustain me while I work in the sm-persimmon-wp_20171001_002orchard. Just that brief sweet juicy explosion can satisfy, nourish and make me smile. These two fruits are new to the orchard and they have proved their worth.

It will be several weeks before we know whether the new persimmons will mature or not but otherwise, we are nearly finished with the harvest.

We have donated an estimated 244 pounds to the food bank. Now, however, the sun weakens and plant production is slowing.

sm-reseeded-lettuce-wp_20170928_001The transition to fall plants such as radish, lettuce, cilantro, mustards, arugula and various cover crops has begun. Check out that germination rate of lettuce that Sue let go to seed! It looks like carpet. Thinning could be a challenge.

We ended up with tasty samples of all apple and pear varieties, even though the winter moth larvae took out many of the blossoms last spring. The good ole Liberty was the best performer and we have enough Liberty to reward the Cider Fest volunteers this coming Saturday.

The dry summer taxed every plant. Our aim is to water just enough to keep the fruit and nut trees in good health. I believe that they got enough water but next year’s crop will tell the tale. We do think the berries and grapes were under watered.

Sat, Oct 7, 2-5, Cider Fest!
Apple contributions are welcome! We have science exhibits for the kids. Cider and pie slices.
Sun, Oct 15, 2-4, Work Party

Sun, Nov 19, 2-4, Work Party
Sun, Dec 17, 2-4, Work Party

In the interest of saving water, saving time watering, and allowing watering to be physically easy, we have applied for another Seattle Dept of Neighborhood matching grant. It’s a small grant, about $10,000, but should be enough to buy a manual pump, ollas, some vertical perforated pipe and low-pressure, gravity fed drip irrigation materials. We also are beneficiaries of a used 1,000-gallon cistern, which could be enough assistance to free us from using city water.

We are in need of a mechanical or civil engineer to help us with choice of pump to carry water from shows-hose-in-and-hose-out-treadle-pump-1the cisterns out to the beds. Choosing the right pump will be critical to the efficacy of the whole irrigation system to the food bank beds. Contact us if that engineer is you or your friend!

Please join us for our annual celebration next Saturday between 2-5pm, rain or shine.

Ruth