Lucky for you, I just did this same thing
My seedlings took off when my water temp got up in the 68F range
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| Water Temperature for Root Growth http://byap.backyardmagazines.com/forum/viewtopic.php?f=1&t=2990 |
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| Author: | BeltieBandit [ Feb 29th, '08, 13:16 ] |
| Post subject: | Water Temperature for Root Growth |
We are out looking for heaters to get the water temp up to what is need for the vegies seedlings to grow. Since we will be using the system year-round, I know we will need one. The question is, what exactly are the temperature requirements. I had heard that 65-70 deg is about right, but would really like everyone's opinon before I step off that ledge and buy the heater. |
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| Author: | tamo42 [ Feb 29th, '08, 13:32 ] |
| Post subject: | |
Lucky for you, I just did this same thing
My seedlings took off when my water temp got up in the 68F range |
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| Author: | TCLynx [ Feb 29th, '08, 22:21 ] |
| Post subject: | |
It will also depend on your fish, some don't like it hot and others do. I know many seeds like the temp even as high as 80 F for germination but I expect you will be better off not going above 70. |
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| Author: | janethesselberth [ Mar 1st, '08, 09:54 ] |
| Post subject: | |
I have trouble with seedlings damping off in my system. My water temp ranges in the mid-80s. Wonder if that is the problem. Hmmmm. |
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| Author: | BeltieBandit [ Mar 1st, '08, 10:26 ] |
| Post subject: | |
Got the heaters today. Spent a little extra to get the unbreakable aluminum casings. According to the chart, I should be able to raise the water temperature at least 20 deg. Water temp right now is at 52, but they have only been in about 6 hours, and the water has been circulating, so it will take time to heat up. I had priced a single pro-titanium 1000W heater, but decided on 3 250W instead. I only need 750W, and this way, if one fails, I will still have the other two. I am putting two in the FT, and one in the sump. The one in the sump is so that when the flood cycle kicks off, I won't be pump dramatically colder water into the FT, as I suspect the fish won't like it. I plan to run the temp at 68-70 on an ongoing basis. |
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| Author: | steve [ Mar 1st, '08, 10:35 ] |
| Post subject: | |
i think lettuce prefers lower root temps versus higher ones. dont have the figures, sorry. |
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| Author: | BeltieBandit [ Mar 1st, '08, 10:53 ] |
| Post subject: | |
We have a whole tray of lettuce waiting to be planted, so if I need to keep the water temp lower for it, that is okay. I set the heater on the lowest setting as I wanted to take the temp up slowely. Does anyone know what themp needs to be? |
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| Author: | Sleepe [ Mar 1st, '08, 11:02 ] |
| Post subject: | |
Beltie From SRAC fact sheet, Water temperature is far more important than air temperature for hydroponic plant production. The best water temperature for most hydroponic crops is about 75 °F. However, water temperature can go as low as the mid-60s for most common garden crops and slightly lower for winter crops such as cabbage,brussel sprouts and broccoli. |
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| Author: | BeltieBandit [ Mar 1st, '08, 13:14 ] |
| Post subject: | |
Thanks for the info, I am slowely moving the temp up, so hopefully we can put these lettuce sprouts in over the next several days. I need more fish at this point. Hopefully in the morning. I am expecting to get some from the squeezing of my indoor aquarium. |
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| Author: | hydrophilia [ Mar 3rd, '08, 00:55 ] |
| Post subject: | |
janetpelletier wrote: I have trouble with seedlings damping off in my system. My water temp ranges in the mid-80s. Wonder if that is the problem. Hmmmm.
Might be, but might also be water level. The stem of the plants often does not like to stay wet, esp when seedling. I had all mine damp off (two or three rounds) until I lowered water level. I had to water them that round with AP water until they sprouted as they were in dry gravel, but once they sent down roots there was no problem. I suppose one could also simply adjust autosiphon level. |
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| Author: | janethesselberth [ Mar 3rd, '08, 09:50 ] |
| Post subject: | |
Be careful that your heaters do not touch your plastic-walled tanks. I created a 3-heater array with a slice of PVC and a brick that you might like to try to replicate. Check my system thread in the last few pages. Should be a pic. |
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| Author: | BeltieBandit [ Mar 3rd, '08, 10:12 ] |
| Post subject: | |
I will do that. The heaters we bought are encased, and are supposed to not have those problems. I don't like to crowd heating elements, so I have them well separated from each other, but I will look at your post. I have them on separate sides of the tank so as to spread out the heat. Thanks for the advice. |
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