Rhizosphere pH as a result of nitrogen levels and NH<sub>4</sub>/NO<sub>3</sub>ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)

Silber, A.; Yones, L. Ben; Dori, I.

doi:10.1023/b:plso.0000037042.32687.95

Cited by 22 publications

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“…A lower pH than the observed one in the sump, most likely would have caused an increase in nutrient uptake. The uptake of most macronutrients is optimal between pH values 6 and 8, whereas the uptake of micronutrients is better below pH 6 (Marschner, 1986;Silber et al, 2004). In commercial hydroponic systems, the pH is typically around 5.5 and 6.0 (Resh, 2012), which is much lower than the pH values reported here.…”

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confidence: 44%

“…This could have been caused by the addition of the ANA supernatant. To restore the electrochemical balance in root cells and nutrient solution, the uptake of cations (i.e., NH4) is balanced by a release of protons (H + ) that decrease the rhizosphere pH (Dudal and Roy, 1995;Neumann and Römheld, 2012;Silber et al, 2004). A lower pH than the observed one in the sump, most likely would have caused an increase in nutrient uptake.…”

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Opportunities and Challenges of Multi-Loop Aquaponic Systems

Goddek

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v Preface Which of us is not familiar with this situation during the student time: on a Wednesday night, one wants to go out to grab a beer ("just one Duveltje") with friends. Until the end of the night (and several beers later) one was trapped in several discussions about religion, politics, and one's field of study. I have to admit, that I have been involved in plenty of such discussions, which also stems from the fact that I am a very discussion-friendly and curious person. However, I caught myself often saying the same sentence "well, the idea is great, but it actually does not really work as it should" with respect to two topics: Aquaponics and Communism. This might appear to be a somewhat far-fetched statement, however, for those who have neither read Marx nor followed the development of aquaponics the last 30 years: in a nutshell it can be stated that both of these ideas follow bottom-up (i.e. local and circular) approaches (i.e. for small farmers and individuals).Additionally to the above, I honestly believe that in times of the financial crisis -in which multinational corporations such as [think of big corporations that produce GMO seeds that are immune to their pesticides] increase their quasi-monopoly positions on the global food market -a paradigm shift back to human-centred and sustainable agricultural development is required to ensure both (1) healthy (i.e. pesticide free) diets and (2) food independence. In contrast, organic, fair trade, and GMO-free food have recently gained rapidly increasing popularity. Consumers want transparent and extensive information about the origin and manufacture of the foodstuffs they buy. The development of agriculture and how to use (finite) resources efficiently will be crucial with respect to the global development and the future of the earth in general. Right now, we are at a crossroads in our history that will determine whether either the people or the corporations will be empowered. I intended to provocatively illustrate this new class conflict on the book cover with the objective to polarize and thus energize the readers themselves to make thoughts and reflections.So far, I have dedicated over 4 years of my life to study and improve aquaponic systems in the hope that one day their production efficiency will be able to compete with state-of-theart hydroponic food production systems, while improving circularity. In this thesis, I will try to demonstrate why aquaponics does not face the same pitfalls as communism, while sharing the empowering people-minded and bottom-up qualities that are required in the 21st century.

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Opportunities and Challenges of Multi-Loop Aquaponic Systems

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“…This could have been caused by the addition of the ANA supernatant. To restore the electrochemical balance in root cells and nutrient solution, the uptake of cations (i.e., NH 4 ) is balanced by a release of protons (H + ) that decrease the rhizosphere pH [27][28][29][30]. A lower pH than the observed one in the sump, most likely would have caused an increase in nutrient uptake.…”

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The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce

et al. 2016

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Abstract:The mobilization of nutrients from fish sludge (i.e., feces and uneaten feed) plays a key role in optimizing the resource utilization and thus in improving the sustainability of aquaponic systems. While several studies have documented the aerobic and anaerobic digestion performance of aquaculture sludge, the impact of the digestate on plant growth has yet to be understood. The present study examines the impact of either an aerobic or an anaerobic digestion effluent on lettuce plant growth, by enriching a mixture of aquaculture and tap water with supernatants from both aerobic and anaerobic batch reactors. The lettuce plants grown in the hydroponic system supplied with supernatant from an anaerobic reactor had significantly better performance with respect to weight gain than both, those in the system where supernatant from the aerobic reactor was added, as well as the control system. It can be hypothesized that this effect was caused by the presence of NH 4 + as well as dissolved organic matter, plant growth promoting rhizobacteria and fungi, and humic acid, which are predominantly present in anaerobic effluents. This study should therefore be of value to researchers and practitioners wishing to further develop sludge remineralization in aquaponic systems.

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“…Globally rhizospheric pH can be influenced by N source via three mechanisms: nitrification/denitrification reactions, displacement of H + /OH − adsorbed on the soil solid phase, and release/uptake of H + by roots in response to NH 4 + / NO 3 − uptake by plant roots (Nye 1981;Marschner and Romheld 1996;Tang and Rengel 2003;Silber et al 2004). It is well known that the uptake of NH 4 + or NO 3 − by plants depend on their concentrations in soil solution, root absorption, and plant growth rate (Richardson et al 2009).…”

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Effect of nitrate and ammonium fertilization on Zn, Pb, and Cd phytostabilization by Populus euramericana Dorskamp in contaminated technosol

Qasim

Motelica-Heino

Bourgerie

et al. 2015

Environ Sci Pollut Res

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This study aimed at assessing the effect of nitrogen addition under two forms, nitrate and ammonium, on the stabilization of Zn, Pb, and Cd by Populus euramericana Dorskamp grown in contaminated soils for 35 days under controlled conditions. Temporal changes in the soil pore water (SPW) were monitored for pH, dissolved organic carbon (DOC), and total dissolved concentrations of metals in the soils rhizosphere. Rhizospheric SPW pH decreased gradually with NH4(+) addition and increased with NO3(-) addition up to one unit, while it slightly decreased initially then increased for the untreated control soil DOC increased with time up to six times, the highest increase occurring with NH4(+) fertilization. An increase in the metal concentrations in the rhizospheric SPW was observed for NH4(+) addition associated with the lowest rhizospheric SPW pH, whereas the opposite was observed for the control soil and NO3(-) fertilization. Fertilization did not affect plant shoots or roots biomass development compared to the untreated control (without N addition). Metals were mostly accumulated in the rhizosphere and N fertilization increased the accumulation for Zn and Pb while Cd accumulation was enhanced for NH4(+) addition. Collectively, our results suggest metal stabilization by P. euramericana Dorskamp rhizosphere with nitrogen fertilization and are potential for phytostabilization of contaminated technosol.

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Rhizosphere pH as a result of nitrogen levels and NH₄/NO₃ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)

Cited by 22 publications

References 21 publications

Opportunities and Challenges of Multi-Loop Aquaponic Systems

Opportunities and Challenges of Multi-Loop Aquaponic Systems

The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce

Effect of nitrate and ammonium fertilization on Zn, Pb, and Cd phytostabilization by Populus euramericana Dorskamp in contaminated technosol

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Rhizosphere pH as a result of nitrogen levels and NH4/NO3ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)

Cited by 22 publications

References 21 publications

Opportunities and Challenges of Multi-Loop Aquaponic Systems

Opportunities and Challenges of Multi-Loop Aquaponic Systems

The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce

Effect of nitrate and ammonium fertilization on Zn, Pb, and Cd phytostabilization by Populus euramericana Dorskamp in contaminated technosol

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Product

Resources

About

Rhizosphere pH as a result of nitrogen levels and NH₄/NO₃ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)