Results 221 to 230 of about 16,351 (250)
Some of the next articles are maybe not open access.
Photosynthesis Research, 2007
Relationships between chlorophyll concentration ([chl]) and SPAD values were determined for birch, wheat, and potato. For all three species, the relationships were non-linear with an increasing slope with increasing SPAD. The relationships for birch and wheat were strong (r (2) approximately 0.9), while the potato relationship was comparatively weak (r
J, Uddling +3 more
openaire +2 more sources
Relationships between chlorophyll concentration ([chl]) and SPAD values were determined for birch, wheat, and potato. For all three species, the relationships were non-linear with an increasing slope with increasing SPAD. The relationships for birch and wheat were strong (r (2) approximately 0.9), while the potato relationship was comparatively weak (r
J, Uddling +3 more
openaire +2 more sources
Chlorophyll Meter for the Evaluation of Potato N Status
American Journal of Potato Research, 2013Here, we propose a new approach to determine the level of plant N nutrition, based on the relationship between chlorophyll meter (CM) readings and total biomass in potato plants. The objectives of this work were i) to determine the critical curve CM (CMc) readings; ii) to establish the relationship between N nutrition index of CM (NNICM), and relative ...
Claudia M. Giletto +1 more
openaire +1 more source
Chlorophyll meter evaluation for nitrogen management in corn
Communications in Soil Science and Plant Analysis, 1994Precise nitrogen (N) fertilizer management in corn requires accurate and timely analysis of plant tissue N status throughout the growing season.
D. Smeal, H. Zhang
openaire +1 more source
Agronomy Journal, 2014
Konica‐Minolta SPAD‐502 leaf chlorophyll meters provide a relative value of leaf chlorophyll content, and from the literature, there are considerable variations among the calibration equations between total chlorophyll contents (μg chlorophyll a + b cm−2) and SPAD‐502 values.
E. Raymond Hunt, Craig S. T. Daughtry
openaire +1 more source
Konica‐Minolta SPAD‐502 leaf chlorophyll meters provide a relative value of leaf chlorophyll content, and from the literature, there are considerable variations among the calibration equations between total chlorophyll contents (μg chlorophyll a + b cm−2) and SPAD‐502 values.
E. Raymond Hunt, Craig S. T. Daughtry
openaire +1 more source
Low-cost chlorophyll meter (LCCM): portable measuring device for leaf chlorophyll
SPIE Proceedings, 2016Portable leaf chlorophyll meter, named low-cost chlorophyll meter (LCCM), has been created. This device was created to help farmer determining the health condition of plant based on the greenness level of leaf surface. According to previous studies, leaf greenness with a certain amount of chlorophyll level has a direct correlation with the amount of ...
Evan Hutomo E. P. +4 more
openaire +1 more source
Efficiency of use of chlorophyll meter and Cardy-ion meter in potato nitrogen nutrition
Cereal research communications, 2008Chlorophyll contents and NO3-N concentration in vegetation depend on soil nitrogen availability and crop nitrogen uptake. Crop nitrogen uptake is important as nitrogen is needed for chlorophyll formation. Sap nitrate is more sensitive to changes in N application compared to total N and the leaf petiole sap accumulate nitrates more then other parts of ...
Majić, Adrijana +4 more
openaire +3 more sources
Use of chlorophyll meter for nitrogen management in lowland rice
Fertilizer Research, 1995The chlorophyll meter (SPAD-502) can be used to diagnose the nitrogen (N) status of rice (Oryza sativa L.) to decide for fertilizer-N side-dressing. The objective of this study was to determine the relationships between SPAD meter readings, unadjusted and adjusted for specific leaf weight (SLW) and N on dry weight basis (Ndw), N on leaf area basis (Na)
I. Johnkutty, SP. Palaniappan
openaire +1 more source
An Overview of Chlorophyll Fluorescence Measurement Process, Meters and Methods
2020 International Conference on Smart Systems and Technologies (SST), 2020The process of photosynthesis implies the transformation of light into chemical energy in photosynthetic organisms. One of the procedures of utilizing the light reaching the plant leaf for chemical energy production is via the chlorophyll (CF) molecules that enable biochemical processes.
Šuljug, Jelena +5 more
openaire +2 more sources
Chlorophyll meter readings in corn as affected by plant spacing
Communications in Soil Science and Plant Analysis, 1993Abstract Heightened environmental consciousness has increased the perceived need to improve nitrogen (N) use efficiency by crops. Synchronizing fertilizer N availability with maximum crop N uptake has been proposed as a way to improve N‐use efficiency and protect ground water quality.
T. M. Blackmer +2 more
openaire +1 more source
Determination of cotton nitrogen status with a handheld chlorophyll meter
Journal of Plant Nutrition, 1992Abstract The ability of a hand‐held chlorophyll meter (SPAD‐502 Chlorophyll Meter3, Minolta Camera Co., Ltd., Japan) to determine the N status of cotton (Gossypium hirsutum L.) was studied at field sites in Alabama and Missouri. Meter readings on the uppermost fully‐expanded leaf were compared to leaf‐blade N and petiole NO3‐N at first square, first ...
C.W. Wood +3 more
openaire +1 more source