Stuppy Aquaponics Blog

Snap Shot of Mg Deficiency in Aquaponics

Posted by Conor Quinlan on Dec 28, 2016 2:56:15 PM

Mg DEFICIENCY:

(11/11) The Mg deficiency observed in the basil over the last couple weeks is beginning to show improvement after raising the fish feed amount to a total of 270 grams per day. This is the ideal amount of feed needed to satisfy lettuce varieties but basil is more rigorous and generally requires 2x the amount of feed as lettuce so feed may need to be increased more. This is now the most likely reason for the deficiency observed in the basil versus the nutrient solution volume. It appears the water moves fast enough through the media to replenish nutrients as the basil bucket test is not showing as much improvement as the media bed individuals.

Below is a comparison of the same

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Topics: Aquaponics, Water

Adding MgCO3 to an Aquaponics System

Posted by Conor Quinlan on Dec 27, 2016 12:22:51 PM

MgCO3 ADDITION:

(11/22) Since the basil deficiency I have been waiting for this new addition. Like CaCO3 it is a natural product, from the rock know as dolomite, and completely none toxic. It is more soluble than CaCO3 and a 200 gram MgCO3 addition, added Friday (11/18), has proven to be more effective at adjusting and maintaining higher pH levels than a 350 gram addition of CaCO3. The 200 g MgCO3 addition raised the pH from 6.6 to 7.0; 350 g CaCO3 could only raise pH from 6.6 to 6.8.

(12/06) The 200 grams of MgCO3 (80 mg/L) addition added on 11/18 is continuing

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Topics: Water

Detailed Water Quality Overview: Nitrite Concentration in Aquaponics

Posted by Conor Quinlan on Dec 27, 2016 12:15:16 PM

Detailed Water Quality Overview: Nitrite Concentration

NITRITE CONCENTRATION INCREASE: (11/16) Nitrite concentration has climbed from 0.25 to 0.5 mg/L while ammonia concentration have remained low (<0.25 mg/L). This is still within safe levels for nitrite (want <l mg/L) but I want to discuss the reasons why this is occurring. There are a couple reasons why the nitrite concentration might be increasing. The first and most likely reason is that the media bed has become clogged with waste debris after a year of running continuously. Around 40% of the space appears

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Topics: Water

AQUAPONICS Water Quality

Posted by Conor Quinlan on Dec 12, 2016 2:22:44 PM

 

 

Nitrogen (mg/L)

 

 

 

Date

pH

Total Ammonia

Ammonia

Nitrite

Nitrate

Temp (Fo)

Alkalinity

mg/L

EC (mS)

11/14/16

6.6

0.25

neg

0.5-1

>160

70.2

25

2.11

11/15/16

6.6

0.25

Negligible

0.5

>160

70.9

22.5-25

2.08

11/16/16

6.6

0.25

Neg.

0.25-0.5

>160

70.8

22.5

2.05

11/17/16

6.6

0.25

neg

0.5

>160

72.9

22.5-25

2.09

11/18/16

6.6->7.0

0.25

Negligible

0.5

>160

72.5

25->40

1.95

11/21/16

6.8-7.0

0.25

Neg.

0.5 – 1.0

>160

67.2

42.5

2.04

11/22/16

6.8-7

0.25

Neg.

1.0

>160

69

42.5

2.06


COMING SOON! Video Blog: We have begun putting together video blog posts about some of the more important aspects of troubleshooting an aquaponic based system. We will be taping the various experiments as well as common procedures involved in the maintenance of the aqueduct. This should make troubleshooting and maintenance a whole lot easier

Water Quality: (11/16) With the feeding requirement increasing to

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Topics: Aquaponics, Water

Aquaponics Systems Today 11/08/2016: Mg deficiency, CaCO3 issue, Outside vs System Crop Comparison, New Pesticide, Blue Light Effects and New System Setup

Posted by Conor Quinlan on Nov 9, 2016 8:48:24 AM

 

 

Nitrogen (mg/L)

 

 

 

Date

pH

Total Ammonia

Ammonia

Nitrite

Nitrate

Temp (Fo)

Alkalinity

mg/L

EC (mS)

11/8/16

6.7- 6.8

0.25

Negligible

0.25

>160

72.2

33.5

2.01

By: Conor Quinlan

Water Quality: In addition to the 250 grams of CaCO3 added on 11/4 I added 300 more grams yesterday and the pH has begun to stabilize around 6.8 again. The change in pH is still proportional to the change in alkalinity and therefore they may act as indicators for each other in a given solution.

Since the increase in fish feed, to 240 grams per day, completed on 11/2, the EC has only risen slightly from 1.86 to 2.01 and appears to be slowing more indicating that the nutrient uptake is increasing. This makes sense particularly as the kale crops grow larger. This feeding regiment seems satisfactory for now.

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Topics: Aquaponics, Water, System Maintenance

Magnesium Deficiency Test in AQUAPONICS

Posted by Conor Quinlan on Nov 7, 2016 10:47:08 AM

 

 

Nitrogen (mg/L)

 

 

 

Date

pH

Total Ammonia

Ammonia

Nitrite

Nitrate

Temp (Fo)

Alkalinity

mg/L

EC (mS)

11/4/16

 6.4->6.6

0.25

Negligible

0.25

>160

72.2

15-30

1.94

By: Conor Quinlan

Water Quality: The pH decreased to 6.4 today so I added 250 grams of CaCO3 to raise the pH and alkalinity again. This managed to raise it to 6.6 instead of 6.8, most likely because I waited longer to add it this time around.  So unfortunately looks like the amount of CaCO3 used can’t be reduced any further than it already is for the particular system parameters.

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Topics: Aquaponics, Water

Mg deficiency solution and Clarifier Design for Aquaponics

Posted by Conor Quinlan on Nov 7, 2016 10:39:36 AM

 

 

Nitrogen (mg/L)

 

 

 

Date

pH

Total Ammonia

Ammonia

Nitrite

Nitrate

Temp (Fo)

Alkalinity

mg/L

EC (mS)

11/3/16

 6.4-6.5

0.25

Negligible

0.25

>160

73.5

20

1.90

By: Conor Quinlan

Water Quality: I have decided to push the parameters of the system again to observe how low the pH can get within a given feeding range. I have increased the feed amount from 150 grams feed per day to 240 mg feed per day over the past week and will not add CaCO3 to increase pH until pH falls around 6.4. The increased feed and lower pH should also help the magnesium deficiency that has been observed in basil crops. Nitrification is proving to be more than sufficient, even at these lower pHs, thanks to the large surface area of the media bed. Now that the feeding rate has increase substantially it will also be interesting to see how nitrification performs over time.

A new, far more accurate, hardness test that uses titration as the chemical testing method was used to determine a more accurate estimate of the Mg concentration. The Mg concentration was lower than previous estimates however with a concentration of 55-67 mg/L that should be more than enough. Magnesium Sulfate was added to the system in very small amounts, only 25 grams for a total Mg concentration increase of 2 mg/L, to quicken the reverse of the Mg deficiency. This addition should help speed up recovery as the increased fish feed is processed and converted to nutrients.

Follow-Up:  

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Topics: Aquaponics, Aqueduct Development, Plants, Water

Aquaponics Systems Today 10/28/2016: Mg Deficiency and Outside Plantings

Posted by Conor Quinlan on Nov 7, 2016 10:23:52 AM

 

 

Nitrogen (mg/L)

 

 

 

Date

pH

Total Ammonia

Ammonia

Nitrite

Nitrate

Temp (Fo)

Alkalinity

mg/L

EC (mS)

10/28/16

 6.6

0.25

Negligible

0.25

>160

73.0

22.5

1.85

By: Conor Quinlan

Water Quality: I have run into an interesting new issue with the system. A little early this week I noticed that the basil is showing significant signs of a deficiency. It appears to be a magnesium deficiency but this seems unlikely as my most recent test results indicate there is 80-100 mg/L in solution, it is possible that the total hardness strip test I have been using are not accurate enough for the type of tests I have been administering or it could be an availability issue.

New Information:  

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Topics: Aquaponics, Water

In Depth Post on Algae and Water Quality in Aquaponics

Posted by Conor Quinlan on Oct 25, 2016 1:05:15 PM

 

 

Nitrogen (mg/L)

 

 

 

Date

pH

Total Ammonia

Ammonia

Nitrite

Nitrate

Temp (Fo)

Alkalinity

mg/L

EC (mS)

10/12/16

 7.2

0.25

Negligible

0.25

>160

72.4

45

1.74

10/24/16

6.6 ->

0

Neg.

0

>160

71.3

22.5->

1.85

By: Conor Quinlan

Water Quality: It has been some time since I have been able to create a post and as such this will include information that was collected from 10/12 – 10/24. A complete water quality test was administered on both 10/12 and 10/24 to determine how hardness and various nutrient concentrations have changed since the last measurements take after draining the system on 9/29. Included below is also a special post about algae; how it can affect your aquaponic system and how best treat it.

Follow-Up:  

SPECIAL POST: CONTROLLING ALGAE GROWTH: Algae can cause significant changes to occur within the aquaponics system if allowed to grow out of control. The most significant changes

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Topics: Aquaponics, Plants, Water

pH-Alkalinity-Feed Rate Interactions in Aquaponics

Posted by Conor Quinlan on Oct 25, 2016 12:48:58 PM

 

 

Nitrogen (mg/L)

 

 

 

Date

pH

Total Ammonia

Ammonia

Nitrite

Nitrate

Temp (Fo)

Alkalinity

mg/L

EC (mS)

10/11/16

 7.2

0.25

Negligible

0.25

>160

72.4

30

1.73

By: Conor Quinlan

Water Quality: After the weekend the water quality is still maintaining at a pH over 7. This seems like a long period of time to maintain given the still low alkalinity so therefore it is possible that a reduction in hardness is only one of the reasons why pH is maintaining. Reducing the feeding rate could be resulting in a slower nitrification rate thereby lowering the amount of acid produced over time enabling alkalinity and pH to maintain longer.

Follow-Up:  

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Topics: Aquaponics, Plants, Water, Fish