I have seen on some forums people using these blu mats and saying they are a great simple and efficient drip irrigation.
They use a gravity fed system. The cone acts as a sensor and releses water when dry and stops when the when moist. No run off etc.They are not cheap. But i have found these that look the same in all ways any one had any experience
here are the cheaper ones. Called tender water spike
http://item.mobileweb.ebay.com/viewitem?itemId=290922915446
here the blumats
http://www.blumatshop.at/index.php/blumat-fur-zimmerpflanzen/tropf-blumat.html
They use a gravity fed system. The cone acts as a sensor and releses water when dry and stops when the when moist. No run off etc.They are not cheap. But i have found these that look the same in all ways any one had any experience
here are the cheaper ones. Called tender water spike
http://item.mobileweb.ebay.com/viewitem?itemId=290922915446
here the blumats
http://www.blumatshop.at/index.php/blumat-fur-zimmerpflanzen/tropf-blumat.html