Calibration of cardy-ion meters to measure nutrient concentrations in soil solution an in plant sap

Folegatti, Marcos Vinícius; Blanco, Flávio Favaro; Boaretto, Rodrigo Marcelli; Boaretto, Antonio Enedi

doi:10.1590/s0103-90162005000100002

Cited by 11 publications

(8 citation statements)

References 4 publications

(6 reference statements)

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“…These results indicate that the sap assessed by Cardy can be used to estimate the N content in the plant. Folegatti et al (2005) observed that the nitrate levels measured in the leaf sap showed a good correlation with the total N content measured in dry matter in tomato plants.…”

Section: Resultsmentioning

confidence: 80%

“…Regarding the K + content in plant tissue, it was found that the values were higher in the EC of 3.5 dS m -1 , with further reduction (Figure 2C and D). Folegatti et al (2005) reported high correlation between the nitrate and the potassium measured using Cardy and the standard laboratory method, in evaluation of tomato plants, noting that the use of Cardy is appropriate to evaluate the ionic concentration in soil solution, providing rapid and precise measurements for the fertigation management.…”

Section: Resultsmentioning

confidence: 99%

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Portable meters for nutritional assessment in plants of gerbera fertigated with electrical conductivity levels

Mota¹,

Bôas

Ludwig

et al. 2014

Rev. bras. eng. agríc. ambient.

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A B S T R A C TRapid tests to assess the nutritional status of plants gerbera can make easier the decision of any adjustments in the fertilization of the substrate. The study was conducted to evaluate nutritionally fertigated gerbera plants with increasing levels of electrical conductivity (EC), using portable meters nitrate and potassium, and chlorophyll. For this, two experiments were conducted. A randomized block design with five levels of EC (0.5, 2.0, 3.5, 5.0 and 6.5 dS m -1 ) and four replications was used. Cherry cultivar was used in the first experiment. In the second experiment, two cultivars (Cherry and Salmon Rose) were used. In the first experiment, the sap of the leaves was subjected to rapid testing of N-NO 3 -(equipment Cardy Horiba C -141). N-NO 3 -and K + (C-131) were determined in the substrate solution. The intensity of the green leaf, in the second experiment was evaluated with portable Chlorophyll Meter. The N content in the indicator leaf in the first and N and K contents in the plant in the second experiment were determined. Rapid tests are presented as good indicators of the level of N-NO 3 -and K + in plant tissue, with the advantages of convenience and speed of determination, facilitating monitoring of fertilization of the substrate by producers and technicians.Medidores portáteis para avaliação nutricional em plantas de gérbera fertirrigada com níveis de condutividade elétrica R E S U M O Os testes rápidos para avaliação do estado nutricional de plantas de gérbera podem tornar mais fácil a decisão de eventuais ajustes na fertilização do substrato. O estudo foi conduzido com o objetivo de se avaliar, nutricionalmente, plantas de gérbera fertirrigadas com níveis crescentes de condutividade elétrica (CE), utilizando-se medidores portáteis de nitrato e potássio, além de clorofilômetro. Para isto foram realizados dois experimentos. Utilizou-se um delineamento em blocos casualizados com cinco níveis de CE (0,5; 2,0; 3,5; 5,0 e 6,5 dS m -1

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Portable meters for nutritional assessment in plants of gerbera fertigated with electrical conductivity levels

Mota¹,

Bôas

Ludwig

et al. 2014

Rev. bras. eng. agríc. ambient.

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“…The Soil Plant Analysis Development (SPAD) value of leaves at different positions on the stem from plants grown in conventional and bokashi hydroponics was obtained with a Minolta SPAD 502 chlorophyll meter (Konica Minolta Sensing Inc., Tokyo, Japan). The readings were obtained from 5 different conventionally and bokashi grown plants [ 41 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of Conventional and Bokashi Hydroponics on Vegetative Growth, Yield and Quality Attributes of Bell Peppers

Tong

Whitehead

Fawole

2021

Plants

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Due to consumers’ awareness and concern about nutrition and health in different parts of the world, the adoption of organic hydroponics is increasing. This has led to a search for organic nutrient media. One of the viable nutrient sources for organic hydroponics is bokashi compost. The principal objective of this study was to compare the performance of 10% bokashi hydroponics with convention hydroponics for bell pepper production. The different hydroponics influenced vegetative growth parameters largely due to considerable differences in the mineral elements in both hydroponic systems. Stems of conventionally grown plants were significantly (p ≤ 0.05) thicker (10.2 mm) compared to those of the bokashi grown plants (7.3 mm). Conventionally grown plants had significantly (p ≤ 0.05) higher photosynthetic performance than bokashi grown plants; normalized difference vegetation index (NDVI) (78.80 versus 67.49), soil plant analysis development (SPAD; 73.89 versus 38.43), and quantum yield (QY; 0.64 versus 0.49). Leaf superoxide dismutase (SOD) activity in the leaves of bokashi grown plants (0.32 units/mg protein) was significantly (p ≤ 0.05) lower than in the leaves of conventionally grown plants (0.37 units/mg protein). This also corresponded to significantly (p ≤ 0.05) higher leaf sap content in the conventionally grown plant than bokashi grown plants. Furthermore, conventional hydroponics yielded three-fold greater pepper fruit per plant compared to bokashi. After 14 days of storage at 7 °C and 95% relative humidity, the firmness of both groups declined, especially for the bokashi grown fruit (27.73 shore unit), which was significantly lower compared to conventionally grown fruit (35.65 shore unit). However, there was an increase in carotenoid content in fruit grown in both hydroponic systems after storage. In conclusion, although bell pepper plant was successfully cultivated in bokashi hydroponics, the plant performance, fruit yield and postharvest quality were lower than conventional hydroponics. We believe that this study and its approach will provide future research with baseline information on optimizing media of bokashi hydroponics to produce bell pepper.

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“…Além disso, se calculou que esses íons representavam entre aproximadamente 30 e 85% do total de sais dissolvidos na solução extraída no solo (TDS ≈ CE.0,54; USSLS, 1954). Obtiveram-se as concentrações de Na + , K + e NO 3com medidor de íon compacto Horiba ® C-122, C-131 e C-141 calibrados, metodologia validada por Folegatti et al (2005).…”

Section: Em Queunclassified

Sistema de extração seqüencial da solução na macro e microporosidade do solo

Gloaguen

Pereira

Gonçalves

et al. 2009

Rev. bras. eng. agríc. ambient.

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Existem várias técnicas de extração da solução no solo; entretanto, a proporção entre a água gravitacional e as retidas por forças capilares é geralmente desconhecida. Neste estudo se propôs desenvolver um sistema de extração seqüencial da solução no solo a fim de caracterizar a sua composição química em função da porosidade do solo. Construíram-se colunas com terra fina secada ao ar de um Cambissolo de textura argilo-siltosa. As colunas foram saturadas por 24 h com água destilada, logo após, a solução no solo foi coletada aplicando-se sucessivamente na base das colunas um vácuo de: 0; -13,3; -26,7; -40,0; -53,3; -66,6 kPa. Mediram-se o volume, o pH, a condutividade elétrica e as concentrações de Na+, K+ e NO3-. Houve boa correlação entre o vácuo aplicado e o potencial mátrico do solo medido por tensiometria (não linear, r² = 0,998), validando o método proposto da extração seqüencial de solução. O estudo evidenciou importantes variações da composição química da solução nas diferentes porosidades do solo, com concentração iônica menor na macroporosidade, exceto para K+, demonstrando a necessidade de se uniformizar a metodologia de amostragem da solução do solo para evitar estimação incorreta da concentração de solutos no solo.

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Calibration of cardy-ion meters to measure nutrient concentrations in soil solution an in plant sap

Cited by 11 publications

References 4 publications

Portable meters for nutritional assessment in plants of gerbera fertigated with electrical conductivity levels

Portable meters for nutritional assessment in plants of gerbera fertigated with electrical conductivity levels

Effects of Conventional and Bokashi Hydroponics on Vegetative Growth, Yield and Quality Attributes of Bell Peppers

Sistema de extração seqüencial da solução na macro e microporosidade do solo

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