well i got this from the f.a.q's and thought id give it a shot and no big major growth changes in like 20+ days and im getting nervous because i wanted to be ready with at least something to start advertising...heres the post.....What ranges should I maintain for my hydroponic nutrients pH, TDS/EC and temperature?
What ranges should I maintain for my hydroponic nutrients pH, TDS/EC and temperature?
Added by: MisterIto Last edited by: 10k Viewed: 588 timesRated by 43 users: 8.77/10I follow and highly recommend the following parameters for hydroponic nutrient solutions for aeroponic, “bubblers”, drip, ebb and flow, NFT, passive, rockwool and wick systems.
PH 5.1-5.9 (5.2 optimal)
TDS 500-1000ppm, EC .75-1.5
Temperature 68-78f, 20-25c (75f, 24c optimal)
The pH of the nutrient solution is a major determinant of nutrient uptake by the plant. If the pH wanders outside the optimum range of between pH 5.1 and pH 5.9, then nutritional deficiency and/or toxicity problems can occur. For hydroponic nutrient solutions used with inert media, keep the pH at 5.2 for optimal elemental uptake. It is at this point that roots most readily assimilate nutrients. These pH and TDS/EC recommendations may seem low relative to the normally suggested range, but are based upon information garnered from "Hydroponic Nutrients" by M. Edward Muckle and Practical Hydroponics and Greenhouses. They both document the low pH resulting in increased nutrient uptake and my experience has shown discernible health and yield improvements at a ph of 5.2 over higher levels.
On page 100, Hydroponic Nutrients displays both the assimilation chart for organic soil applications and another for inert medium hydroponics, which depicts the vastly different scenarios. The widely accepted soil based chart is frequently misapplied to water culture applications. His research and that done by others, documented in Practical Hydroponics and Greenhouses, indicate that iron and phosphorous precipitate in nutrient solutions at pH levels above 6. Stay below a pH of 6 by all means to avoid this problem and benefit.
The nutrient assimilation rate is further enhanced by the reduction in solution TDS/EC, which reduces osmotic pressure and allows the roots to draw the nutrients "easier". Young, established seedlings or rooted cuttings are started at 500-600ppm. The TDS is increased to 800-900ppm during peak vegetative growth. During the transition from early to heavy flowering, TDS is further raised to 1000-1100ppm. It is then reduced to 400-500ppm during the final 2 weeks of flushing. The plants demonstrate their preference for a lower TDS/EC when running a lower pH by clearly sustaining higher growth rates.
The optimum temperature for hydroponic solutions to be is 24c/75f. At this point, most elements are assimilated highest and atmospheric oxygen is most readily dissolved. Although increases in temperature increase the rate of photosynthesis, avoid exceeding the maximum listed of 25c/78f. Elevated temperatures make some elements more available, but reduce the solution's dissolved oxygen capacity, increasing root disease likelihood.
I WOULD LOVE TO KNOW IF THIS METHOD HAS WORKED OUT FOR SOMEONE OTHER THAN THE GUY WHO POSTED IT...ANYWAY,I GOT 1 EVEN WORST..I CALLED MY HYDRP STORE GUY AND HE SAID MAINTAIN SOLUTION AT A HIGHER RATE THAN I EVER HEARD OR READ!!...HE SAID 6.5!!!..IM LIKE WHOOAAA!..MY TAP WATER COMES OUT AT 6.8..THIS IOS WHY I END UP SOOOO CONFUSED,BECAUSE I REALLY NEED TO GET THAT SOG STYLE GROW TO WHERE I CAN GET AT LEAST AN OZ FROM EACH,BUT IT DOESNT LOOK THAT WAY..ANOTHER THING...WHEN I USE CRAPPY CAM. PHONE TO TAKE PICS...ITS LIKE I GET THESE "RADIATION LINES" GOING THROUGH THE PIC..CANT GET CLEAR SHOT UNLESS IM REALLY UP ON A PLANT AND AT THAT POINT U CANT SEE GARDEN..ILL TAKE A PIC SO U GET AN IDEA...AND THANX FOR STILL CHECKING IN FOR ME HOMEY