Chlorophyll Meter Method For Estimating Nitrogen Content In Plant Tissue

1997 ◽  
Author(s):  
James Schepers ◽  
Tracy black mer ◽  
Dennis Francis
Keyword(s):  
Nitrogen Content ◽  
Plant Tissue ◽  
Chlorophyll Meter

USING CHLOROPHYLL METER TO PREDICT SUNFLOWER NITROGEN CONTENT AFTER OLIVE SOLID WASTE APPLICATIONS

2009 ◽  
pp. 163-170
Author(s):  
Y. Kavdir ◽  
R. Ilay ◽  
H. Turhan ◽  
L. Genc ◽  
I. Kavdir ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Solid Waste ◽  
Chlorophyll Meter

scholarly journals Evaluation of the Use of SPAD-502 Chlorophyll meter for non-destructive estimation of nitrogen status of tea leaf (Camellia sinensis L. Kuntze)

2019 ◽  
Author(s):  
Wahono A. Wahono ◽  
D. Indradewa ◽  
B. H. Sunarminto ◽  
E. Haryono ◽  
D. Prajitno
Keyword(s):  
Nitrogen Content ◽  
Nitrogen Fertilizer ◽  
Nutrient Management ◽  
Leaf Nitrogen ◽  
Leaf Nitrogen Content ◽  
Nitrogen Status ◽  
Chlorophyll Meter ◽  
Leaf N Content ◽  
Tea Leaf ◽  
Spad Readings

Efficient nutrient management requires estimating factual fertilizer requirements. This study was aimed to test the use of chlorophyll meter SPAD-502 to estimate the nitrogen status of tea maintenance leaf. The test was carried out by correlating the SPAD readings with destructively measured leaf nitrogen content using samples oGbtained from nitrogen fertilizer dosage experiments. Observations were made at 15, 32, 45 and 62 days after the application of N fertilizer treatments. The results showed that the SPAD readings and total nitrogen leaf content correlated significantly with the time of observation. Estimation of leaf N content based on the SPAD readings follows linear line equation y = 0.0311x + 1.5856 with coefficient determinant (R²) = 0.62 significantly at P less than 0.01. It was concluded that SPAD-502 chlorophyll meter is reliable to assess the leaf nitrogen content of tea maintenance leaf and is adequate to predict future nitrogen fertilizer requirements.

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

2014 ◽  
Vol 18 (3) ◽  
pp. 258-262 ◽  
Author(s):  
Poliana R. D'A. Mota ◽  
Roberto L. Villas Bôas ◽  
Fernanda Ludwig ◽  
Dirceu M. Fernandes ◽  
Marcos V. Folegatti
Keyword(s):  
Electrical Conductivity ◽  
Nutritional Status ◽  
Plant Tissue ◽  
Nutritional Assessment ◽  
Block Design ◽  
Rapid Testing ◽  
Substrate Solution ◽  
Chlorophyll Meter ◽  
Randomized Block Design ◽  
Rapid Tests

Rapid 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-NO3- (equipment Cardy Horiba C -141). N-NO3- 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-NO3- 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.

Portable Chlorophyll Meter for Indirect Evaluation of Photosynthetic Pigments and Nitrogen Content in Sweet Sorghum

Sugar Tech ◽  
2021 ◽  
Author(s):  
Warlles Domingos Xavier ◽  
Gustavo Castoldi ◽  
Thomas Jefferson Cavalcante ◽  
Carlos Ribeiro Rodrigues ◽  
Polyanna Ribeiro Trindade ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Photosynthetic Pigments ◽  
Sweet Sorghum ◽  
Chlorophyll Meter ◽  
Indirect Evaluation

scholarly journals Principal Aliphatic Secondary Amines of Burley Tobacco

1970 ◽  
Vol 5 (6) ◽  
Author(s):  
L. Bush
Keyword(s):  
Nitrogen Content ◽  
Plant Tissue ◽  
Steam Distillation ◽  
Secondary Amines ◽  
Basic Medium ◽  
Stem Tissue ◽  
Drying Process ◽  
Leaf Lamina ◽  
Burley Tobacco ◽  
Amine Content

AbstractQuantity and distribution of the principal aliphatic secondary amines - dimethylamine, methylethylamine, diethylamine, and methylpropylamine - varied within plant tissue and among Nicotiana spp. In Burley tobacco the stem tissue had the highest content of these amines and the leaf midrib the lowest. Leaf lamina, roots and seed were intermediate in amine content. Among Nicotiana spp. there was considerable difference in total amine content as well as among the ratios of the amine fractions measured. Amine content of tissue was positively correlated with nitrogen content of tissue and was altered by the drying process of tissue prior to analysis. The amines were not present as free amines or salts but were detected only following steam distillation from a basic medium

scholarly journals Chlorophyll meter reading and total nitrogen content applied as topdressing in parts of the crambe plant

2016 ◽  
Vol 15 (2) ◽  
pp. 45-49 ◽  
Author(s):  
Claudia Mascarello Ana ◽  
Roque Benetoli da Silva Tiago ◽  
Tom eacute Gouveia Beatriz ◽  
Bernardi Daiane ◽  
Secco Deonir ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Total Nitrogen ◽  
Total Nitrogen Content ◽  
Chlorophyll Meter

Freeze-fracture, freeze-etch complementary pairs of virus-infected cells reveal value of etching even when relatively high concentrations of cryoprotectants are used

1978 ◽  
Vol 36 (2) ◽  
pp. 136-137
Author(s):  
Russell L. Steere ◽  
Eric F. Erbe
Keyword(s):  
Plant Tissue ◽  
Phosphate Buffer ◽  
Infected Plant ◽  
Freeze Fracture ◽  
Distilled Water ◽  
Virus Infected Plant ◽  
Infected Cells ◽  
High Concentrations

It has been assumed by many involved in freeze-etch or freeze-fracture studies that it would be useless to etch specimens which were cryoprotected by more than 15% glycerol. We presumed that the amount of cryoprotective material exposed at the surface would serve as a contaminating layer and prevent the visualization of fine details. Recent unexpected freeze-etch results indicated that it would be useful to compare complementary replicas in which one-half of the frozen-fractured specimen would be shadowed and replicated immediately after fracturing whereas the complement would be etched at -98°C for 1 to 10 minutes before being shadowed and replicated.Standard complementary replica holders (Steere, 1973) with hinges removed were used for this study. Specimens consisting of unfixed virus-infected plant tissue infiltrated with 0.05 M phosphate buffer or distilled water were used without cryoprotectant. Some were permitted to settle through gradients to the desired concentrations of different cryoprotectants.

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