Recent content by boertje

How Does Chitosan Help Cloning Plant Cuttings? Since the cuttings have no roots they have a harder time getting water. Research has shown that plants given a foliar spray of Chitosan Oligosaccharide need up to 46% less water. Dosage (Optimal concentration ranging from 50-2000 ppm) We...

You're better of on aliexpress, same quality as ebay and much cheaper.

No, that's without any chelating agent. Note that i don't do DWC , but as far i know you could go up to 2000 ppm. I'm from Europe, but: http://www.carbosynth.com/carbosynth/website.nsf/(w-productdisplay)/7B41E73D34E8F49680257C97005F3CF6

between 200-800 ppm is common practice. I run it with Canna cogr wich contains both fulvic and humic acids

Kevin folta is a very controversial scientist and very much associated with Monsanto and GMO(talking biotech podcast).Still great articles though

Regarding your statement of diminishing photon flux, i am not shore if you are referring to led light systems. If you are then i would advice to read this white paper of Cree: http://www.cree.com/led-components/media/documents/HorticultureReferenceDesign.pdf And perhaps dig in to the inverse...

configuring a light system for optimum yield and quality takes a bit more effort then only running HPS, no offense.

actually, i have only grown with HPS for over 20 years, and still do. The high PPF of the HPS will only be sufficient with short plants,regarding inter-nodal spacing and stem elongation. With bigger plants HPS will induce SAS, again associated with crop yield. Even Gavita says to supplement...

@ Wietefras I read your post on the lepton flir. It completely tempered my enthusiasm for my recent purchase. I just ordered the radiometric version a couple of days ago with the intention to log some data from it, or perhaps even use it as a sensor. Do you also have the radiometric version...

@ Hybridway Quantity x Quality x uniformity is the formula for optimal photosynthetic action potential in my handbook. HPS low cri is a bitch when it comes to inter-nodal spacing and stem elongation, wich are both related to crop yield

@ Wietefras, bumb There is some science that backs up some of the statements of the original poster ncbi.nlm.nih.gov/pmc/articles/PMC2892149/ In this study, blue light has been shown to trigger both a qualitative signalling effect enabling normal photosynthetic functioning of cucumber...