watering depth

how deep do I water each plant and why,
the answer is how deep the roots go on each plant,
find out how deep the roots are and you know how deep to water,
for example, 
corn and squash have deep roots,
onions have shallow roots
the shallow watered things are going to need water more often,
my onions need water once a day (24 hours or so, not 36 or 47.999 hours)
and if you spend lots of time and water to deep water them you still need to water them the next day,
but the corn you can water deep and it will not need water for 2 days or more.


the next usual question is how do I tell how deep I have watered,
and answer is to dig down and look.
just water an area of example dirt, then dig down and see how deep the water got,
you can also tell how deep the roots of a plant are by digging down and looking, but that hurts the plants, so likely best to just look it up.

here is the example of looking it up for beans
http://www.soilandhealth.org/01aglibrary/010137veg.roots/010137ch20.html

good luck on your watering adventures
and I think I fixed the issue with people not being able to leave comments 

and the index for the linked book is here for people that can't figure it out
http://www.soilandhealth.org/01aglibrary/010137veg.roots/010137toc.html