We say 'rooting' in horticulture (my specialty). "De poço artesiano" is referring to the water. So the whole phrase would be '[seed] germination and rooting using artesian well water'.

Examples of "germination and rooting":


www.jstor.org/stable/40928195‎
JSTOR
Feb 26, 2010 - **seed germination and rooting** in traditional crops and common native plants from the machair. Materials and methods. Preparation of kelp and ...

Biological soil crust influence **on germination and rooting** ... - Springer
link.springer.com/.../10.1007%2Fs111...‎

www.growthproducts.com/pages/horticulture.asp?tables=sol&pr...‎
University trials at Iowa State have shown a 50 to 70% increase in **seed germination and rooting** with Essential compared to phosphorous and IBA products.

tztianhua.en.alibaba.com › Product Categories › Plug Tray › 128 cell‎
plastic trays for **germination and rooting**, Nursery Trays & Lids,

www.ebay.co.uk › Garden & Patio › Fertiliser/ Soil Improvement‎
eBay
Organic **germination and rooting** energiser (120ml) with humic acid concentrate. in Garden & Patio, Fertiliser/ Soil Improvement | eBay.

jxb.oxfordjournals.org/.../1313.full.pdf‎
Journal of Experimental Botany
by L NANDAKUMAR - ‎1985 - ‎Cited by 9 - ‎Related articles
on **Seed Germination and Rooting**. LAKSHMI NANDAKUMAR1 AND N. S. RANGASWAMY. Department of Botany, University of Delhi, Delhi 110007, India.




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Note added at 13 hrs (2014-03-18 10:04:06 GMT)
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Ón second thought, a better translation would be:

'artesian well water for [seed] germination and rooting

because your context is about irrigation.