Crop physiological response to nutrient solution electrical conductivity and pH in an ebb-and-flow hydroponic system

Wortman, Sam E.

doi:10.1016/j.scienta.2015.07.045

Cited by 116 publications

(71 citation statements)

References 26 publications

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“…At 4 WAT, the plant that got higher EC at initial phase increased the height significantly. This data in line with Sam [3] who found that plant height decreased due to low EC. When the plant entered middle vegetative phase all experiment units got additon of EC of 2 mS cm -1 , where C and D treatments had siginificant effect on plant height.…”

Section: Plant Heightsupporting

confidence: 91%

Growth and Yield of Chili in Nutrient Film Technique at Different Electrical Conductivity

Hidayat

Pahlevi

Taufiqqurahman

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. An increase production of Capsicum annuum in Nutrient Film Technique (NFT) can be done by setting Electrical Conductivity (EC) of vegetative (Va & Vt) and generative (G) phases. A greenhouse trial has been carried out using a completely randomized design with four treatments and six replications. The treatments were A = EC (Va = 1,2 mS cm -1 , Vt = 2 mS cm ). The result showed that the composition of EC at the initial vegetative (Va) phase 1,5 mS cm -1 , middle vegetative (Vt) phase EC of 2 mS cm -1 and generative (G) phase EC 3 mS cm -1 had increased crop height, fruit number and chili fresh weight. The experiment indicated that the high EC starts from vegetative phase has better effect rather than only high on the generative phase.

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Section: Plant Heightsupporting

confidence: 91%

Growth and Yield of Chili in Nutrient Film Technique at Different Electrical Conductivity

Hidayat

Pahlevi

Taufiqqurahman

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Leafy vegetable crops (e.g., Brassica oleracea L.) demonstrated the greatest yield benefit, whereas yield gains were more modest for root, tuber, and bulb crops (e.g., Manihot esculenta Crantz). Leafy vegetable crops and herbs are often more responsive to increasing fertility (organic amendments or synthetic fertilizer) than fruiting, grain, or root crops (e.g., Wortman, 2015). Moreover, elevated soil N can result in greater shoot growth and reduced root vs. shoot biomass partitioning (Davidson, 1969;Wortman and Dawson, 2015).…”

Section: Crop Specific Yield Responsementioning

confidence: 99%

First‐Season Crop Yield Response to Organic Soil Amendments: A Meta‐Analysis

et al. 2017

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Core Ideas Organic amendments are promoted as sustainable alternatives to synthetic fertilizer. Crop yield increased by an average of 43% in the first season after organic soil amendment. Yield benefit from organic amendments was greater in leafy crops than root crops. Poultry manure was commonly used and provided the greatest agronomic benefit. Yield benefit of organic amendment was lower in arid regions with poor soil quality. Organic soil amendments are increasingly promoted as a sustainable alternative to synthetic fertilizers and as a tool for building soil quality through improved chemical, physical, and biological properties. However, short‐term yield response to organic amendments is highly variable. A meta‐analysis of 53 studies was conducted to (i) develop a global estimate of first‐season crop yield response to organic amendments, and (ii) determine the effect of crop type, amendment characteristics, soil properties, cultural practices, and climate on the magnitude of this yield response. Yield response ratios were calculated (organic amendment yield compared to a non‐fertilized control) and differences among groups were determined using 95% bootstrap confidence intervals (CI). Across all studies, crop yield increased 43±7% (95% CI) in the first‐season after an organic amendment. Yield response was greatest for leafy crops (71±26% increase) and lowest for root/tuber/bulb crops (29±10% increase). Poultry manure/compost was the most commonly used amendment and provided a yield increase of 76±21%. In contrast, plant‐based amendments increased yield by only 27±9%. Amendment application rate alone was not an effective predictor of yield response, and there were not enough studies available to explore the possible interaction between amendment type and rate. Yield benefits of organic amendments were muted in soils with high organic matter and in arid climates. These results help identify options for maximizing the agronomic value of organic amendments, and suggest research is needed to improve agronomic efficiency of amendments in arid regions with poor soil quality.

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“…'terra-fria' does not require the maximum availability of mineral nutrients from the Hoagland and Arnon's nutrient solution to achieve high primary productivity. The electrical conductivity (EC) increased of the solution can cause negative effects in the photosynthetic electron transport chain and, consequently, on the photosynthetic rate (WORTMAN et al 2015), reducing biomass production (ROOSTA; HAMIDPOUR, 2011). In addition, 50% I and 75% I showed a higher apparent carboxylation efficiency and biomass production.…”

Section: Discussionmentioning

confidence: 99%

IS Annona emarginata CAPABLE OF ACCUMULATE ESSENTIAL HEAVY METALS WITHOUT DAMAGES IN THE METABOLISM?

et al. 2017

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ABSTRACT-This study aimed to evaluate if ionic strength variation causes differential accumulation of heavy metals in plants of Annona emarginata (Schltdl.) H. Rainer var. 'terra-fria', modifying gas exchange and dry matter production. The seedlings were cultivated under different ionic strengths of the 'Hoagland and Arnon's' nutrient solution (75% I, 50% I and 25% I). At 180 days after the application of the treatments, the effects of the essential heavy metals on the physiological parameters and foliar ionic concentration were assessed. The leaf gas exchanges and vegetative growth were affected by the variation in the essential heavy metals, with positive effects on the plants that were treated with 75%I. The seedlings that were grown under 75% I presented higher concentrations of Zn (24.2mg kg ) accumulated more under 25% I, but gas exchanges and vegetative growth were reduced, compared to 50%I and 75%I. We can conclude that the ionic strength variation alters gas exchange and the dry matter accumulation, causing differential accumulation of Fe, Mn and Zn in A. emarginata, occurring inverse relationship between increased ionic strength and Fe and Mn content, besides directly relationship to the Zn content. Index terms: Heavy metals; ionic strength; mineral nutrition; photosynthesis. A Annona emarginata É CAPAZ DE ACUMULAR METAIS PESADOS ESSENCIAIS SEM CAUSAR DANOS AO SEU METABOLISMO?RESUMO-Este estudo teve como objetivo avaliar se a variação da força iônica (I) provoca acúmulo diferencial de metais pesados, em plantas de Annona emarginata (Schltdl.) H. Rainer 'var. terra-fria', modificando as trocas gasosas e produção de matéria seca. As mudas foram cultivadas sob diferentes forças iônicas da solução nutritiva (75%I, 50%I e 25%I). Aos 180 dias após a aplicação dos tratamentos, foram avaliados os efeitos dos metais pesados essenciais sobre os parâmetros fisiológicos e concentração iônica foliar. As trocas gasosas e crescimento vegetativo foram afetados pela variação das concentrações dos metais pesados essenciais, com efeitos positivos sobre as plantas que foram tratadas com 75%I. ) foram acumulados em maiores concentrações na solução com 25% I, mas as trocas gasosas e o crescimento vegetativo foram reduzidos comparados com 50%I e 75%I. Podemos concluir que a variação da força iônica altera as trocas gasosas e o acúmulo de matéria seca, causando acúmulo diferencial de Fe, Mn e Zn em A. emarginata, ocorrendo relação inversa entre o aumento da força iônica e teor de Fe e Mn, além de relação direta ntre a força iônica ea concentração de Zn. Termos para indexação: fotossíntese; força iônica; metais pesados; nutrição mineral.

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Crop physiological response to nutrient solution electrical conductivity and pH in an ebb-and-flow hydroponic system

Cited by 116 publications

References 26 publications

Growth and Yield of Chili in Nutrient Film Technique at Different Electrical Conductivity

Growth and Yield of Chili in Nutrient Film Technique at Different Electrical Conductivity

First‐Season Crop Yield Response to Organic Soil Amendments: A Meta‐Analysis

IS Annona emarginata CAPABLE OF ACCUMULATE ESSENTIAL HEAVY METALS WITHOUT DAMAGES IN THE METABOLISM?

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