How can I find a way to estimate the watering needs of my trees?
I planted saplings 3 years ago and now many of them are upwards of 10-12' tall. Some trunks as large as 2". My watering now is guess work and I'd like to know that at least I am somewhat close to what they need.
Is there a calculation I can make based on species, size and climate data? Is there research data I should look at?
I will not be able to purchase expensive equipment which needs to be monitored on a regular basis.