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  • Does iAVs need supplementary nutrients added?

    Posted by Admin on 26 May 2024 at 9:13 am

    Due to some recent comments I read online I thought I would leave this here as an open ended question for some feedback….as Pink Floyd once said, “Is there anybody out there?”

    Let’s hear your thoughts…

    Admin replied 3 weeks ago 2 Members · 5 Replies
  • 5 Replies
  • DeLynn

    Member
    26 May 2024 at 9:22 am

    Yes it does require the usual addition of base minerals because they are not available in the components used in a recirculating farming system, and what may be available is quickly taken up by the first crop. Sand help replenish some of them, but it is not always enough..By base minerals, I am referring to magnesium, potassium, iron ect.

  • Admin

    Administrator
    27 May 2024 at 7:52 am

    The first paper I will be reviewing is titled “Water Quality Maintenance and Mineral Assimilation by Plants Influence Growth of Hybrid Tilapia in Culture with Vegetable Crops“.

    The paper states that the fish were fed a diet with a minimum of 32% crude protein, which was not fortified with vitamins or trace elements. Despite this, the fish grew well and no nutrient deficiencies in the plants were reported, demonstrating the fish feed alone supplied adequate nutrition.

    The fish waste contains sufficient minerals for the plants. As the fish consume the feed, they excrete waste that is rich in plant-available nutrients like nitrogen, phosphorus, potassium, and other minerals. The sand growing medium captures and mineralizes these nutrients, making them available to the plants.

    The study maintained excellent plant yields and fish growth over an extended period without any supplemental nutrients.

    In conclusion, the paper “Water Quality Maintenance and Mineral Assimilation by Plants Influence Growth of Hybrid Tilapia in Culture with Vegetable Crops” provides strong scientific evidence that properly designed iAVs do not require any supplementary nutrient addition. The fish feed and resulting waste is sufficient to grow healthy plants.

    The claim that iAVs requires additional fertilization is not supported by scientific evidence.

    The data from rigorous studies clearly demonstrates that iAVs is a self-sufficient system that does not need supplementary nutrients. Anecdotal reports suggesting extra fertilization is necessary are based on individual observations or beliefs, not on controlled experiments or verified facts.

    In contrast, iAVs has been thoroughly researched using the scientific method. Peer-reviewed papers have consistently shown that fish feed and waste alone provide complete nutrition for healthy plant growth in properly managed iAVs.

    As the only aquaponics approach backed by replicated trials and scientific validation, iAVs is the most reliable model for integrating fish and vegetable production. Its proven ability to operate sustainably without external inputs sets it apart from other aquaponic techniques and unsubstantiated claims.

    Conclusions about iAVs should be based on empirical data, not hearsay or personal anecdotes lacking scientific rigor.

    • This reply was modified 3 weeks ago by  Admin.
  • Admin

    Administrator
    27 May 2024 at 9:07 am

    The second paper I will be reviewing is titled ‘Yield of Tomato Irrigated with Recirculating Aquaculture Water as Influenced by Quantity of Fish Waste Products Supplied‘.

    This study demonstrates that the nutrients necessary for plant growth can be adequately supplied by the fish waste products in a recirculating aquaculture system without the need for additional supplementation of base minerals.

    Specifically, the study noted that “All water quality variables were maintained within acceptable levels for tilapia by circulation through the biofilters,” and “Nitrogenous compounds, which frequently limit fish production in other recirculatory water systems, did not reach toxic levels and were extracted by the plants” . This indicates that the system was effective in recycling nutrients from fish waste for plant use, negating the need for external nutrient supplementation.

    The study highlighted that plants assimilated an increasing percentage of the nutrient input with increasing biofilter volume (BFV), corroborated by lower nutrient concentrations in the water with increasing BFV. This suggests that the system’s design allows for efficient nutrient uptake by plants directly from the fish waste, without the necessity for additional mineral inputs.

    The sand medium and system design are such that they enable the complete assimilation of nutrients by plants, making external supplementation unnecessary under normal operating conditions.

    In conclusion, the claim that iAVs requires the addition of base minerals due to their absence in the system components or rapid uptake by plants is contradicted by scientific evidence.

    The study by McMurtry et al. demonstrates that iAVs can efficiently recycle nutrients from fish waste, providing sufficient mineral content for plant growth without the need for external nutrient supplementation


  • Admin

    Administrator
    27 May 2024 at 9:48 am

    The third paper I will review is titled ‘Mineral Nutrient Concentration and Uptake of Tomato Irrigated with Recirculating Aquaculture Water as Influenced by Quantity of Fish Waste Products Supplied‘.

    This study demonstrates that the Integrated AquaVegeculture System (iAVs) can provide sufficient nutrients for plant growth without the need for additional supplementation of base minerals.

    The study found that all nutrients were assimilated above deficiency levels, with tissue concentrations of nitrogen (N), phosphorus (P), potassium (K), and magnesium (Mg) not being limiting. Although calcium (Ca) was found to be low and sulfur (S) was high when their sole nutrient source was fish waste, micronutrients were assimilated in excess of sufficiency, and toxicity was not observed. This indicates that the nutrient profile provided by the fish waste in the iAVs system is largely adequate for plant growth.

    Furthermore, the study suggests that alterations in fish feed mineral nutrient content could better meet plant requirements while still remaining within the range of fish needs, rather than adding supplementary nutrients directly to the system. For example, the fish feed formulation employed in the study was found to be relatively low in calcium (Ca) for supporting plant growth, suggesting that the Ca component of the fish feed might be increased to mitigate deficiencies in tomato crops irrigated with recirculatory aquaculture water. This approach maintains the closed-loop nature of the iAVs system, leveraging adjustments in fish feed composition to balance nutrient availability for plants, rather than relying on external nutrient inputs.

    In summary, the iAVs system, as evidenced by the research, does not require the usual addition of base minerals like magnesium, potassium, iron, etc., because the system inherently provides a balanced nutrient profile.

  • Admin

    Administrator
    27 May 2024 at 10:10 am

    The fourth paper I will review is titled ‘<b style=”font-family: inherit; font-size: inherit; color: var(–bb-body-text-color);”>Food Value, Water Use Efficiency and Economic Productivity of an Integrated Aquaculture-Olericulture System as Influenced by Component Ratio‘.

    The study demonstrates that iAVs efficiently utilizes the nutrients available from fish waste to support plant growth without the need for additional supplementation.

    The iAVs method has been shown to maintain adequate levels of aqueous nitrate concentrations through microbial conversions and plant assimilation of nitrogenous compounds, which are critical for plant growth. This indicates that the system can self-regulate the availability of essential nutrients within the recirculating water, relying on the natural processes of biofiltration and plant uptake.

    The scientific evidence from the study clearly indicates that iAVs does not require the addition of base minerals or other supplementary nutrients, as the system inherently provides a balanced nutrient profile through the recycling of fish waste. This contradicts the incorrect assertion that iAVs requires usual supplementation of base minerals due to their unavailability or rapid uptake by plants.

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Does iAVs need supplementary nutrients added?