scholarly journals Effect of net shading technology on the yield quality and quantity of chilli pepper under greenhouse cultivation

2021 ◽  
pp. 5-9
Author(s):  
Stella Agyemang Duah ◽  
Zsuzsa Nagy ◽  
Clarice Silva E Souza ◽  
Zoltán Pék ◽  
András Neményi ◽  
...  
Keyword(s):  
Vitamin C ◽  
Chlorophyll Content ◽  
Modified Atmosphere ◽  
Chilli Pepper ◽  
Leaf Chlorophyll ◽  
Yield Quality ◽  
Marketable Fruit ◽  
Control Samples ◽  
Relative Chlorophyll Content

This study was undertaken to identify the effect of net shading technology on the total capsaicinoids, vitamin C and relative chlorophyll content expressed as SPAD (Soil Plant Analysis Development) values and total marketable fruit yield of ‘Star Flame’ chilli pepper (Capsicum annuum) for two harvesting times cultivated under modified atmosphere. ‘Star Flame’ pepper was grown under three (3) different net shading colours (white, red and green). Samples without net shading were used as control. Samples were subjected to chromatographic analyses using HPLC for the determination of total capsaicinoids and vitamin C. Interaction in shading technology and harvest times (p=0.010) had significant effect on total capsaicinoids as a result of green and white shading technologies showing higher differences when compared to control samples. Vitamin C content was observed to have increased in white and red shadings (p=0.001) after the first harvest and gradually decreased after the second harvesting time (p=0.002). Relative leaf chlorophyll content was significantly higher in white shading in the first and second harvest. Samples used as control had significantly higher marketable values when compared to white and green shadings with red recording low marketability of ‘Star Flame’ chilli peppers.

scholarly journals Estimating Leaf Chlorophyll Content of Buffaloberry Using Normalized Difference Vegetation Index Sensors

2021 ◽  
pp. 1-7
Author(s):  
Ji-Jhong Chen ◽  
Shuyang Zhen ◽  
Youping Sun
Keyword(s):  
Chlorophyll Content ◽  
Vegetation Index ◽  
Near Infrared ◽  
Normalized Difference Vegetation Index ◽  
Red Light ◽  
Leaf Chlorophyll Content ◽  
Nir Light ◽  
Leaf Chlorophyll ◽  
Chlorophyll Extraction ◽  
Relative Chlorophyll Content

Commercial optical chlorophyll meters estimate relative chlorophyll content using the ratio of transmitted red light and near-infrared (NIR) light emitted from a red light-emitting diode (LED) and an NIR LED. Normalized difference vegetation index (NDVI) sensors have red and NIR light detectors and may be used to estimate chlorophyll content by detecting the transmitted red and NIR light through leaves. In this study, leaf chlorophyll content of ‘Torrey’ buffaloberry (Shepherdia ×utahensis) plants treated with 0 mm [zero nitrogen (N)], 2 mm (medium N), or 4 mm (ample N) ammonium nitrate for 3 weeks were evaluated using two commercial chlorophyll meters and NDVI sensors. The absolute chlorophyll content was determined using chlorophyll extraction. Our results showed that plants receiving ample N and medium N had decreased transmitted red light (i.e., greater absorption in red light). Measurements of optical chlorophyll meters, NDVI sensors, and chlorophyll extraction similarly showed that plants receiving medium N and ample N had greater leaf chlorophyll content than those receiving zero N. Relative leaf chlorophyll content estimated using NDVI sensors correlated positively with those from the chlorophyll meters (P < 0.0001; r2 range, 0.56–0.82). Therefore, our results indicate that NDVI measurements are sensitive to leaf chlorophyll content. These NDVI sensors, or specialized sensors developed using similar principles, can be used to estimate the relative chlorophyll content of nursery crops and help growers adjust fertilization to improve plant growth and nutrient status.

scholarly journals Nondestructive determination of leaf chlorophyll content in two flowering cherries using reflectance and absorptance spectra

2010 ◽  
Vol 6 (2) ◽  
pp. 219-234 ◽  
Author(s):  
Junichi Imanishi ◽  
Aki Nakayama ◽  
Yoko Suzuki ◽  
Ayumi Imanishi ◽  
Nobuyuki Ueda ◽  
...  
Keyword(s):  
Chlorophyll Content ◽  
Leaf Chlorophyll Content ◽  
Nondestructive Determination ◽  
Leaf Chlorophyll

scholarly journals Stimulation Effects of Foliar Applied Glycine and Glutamine Amino Acids on Lettuce Growth

2019 ◽  
Vol 4 (1) ◽  
pp. 164-172 ◽  
Author(s):  
Yaghoub Aghaye Noroozlo ◽  
Mohammad Kazem Souri ◽  
Mojtaba Delshad
Keyword(s):  
Amino Acids ◽  
Vitamin C ◽  
Chlorophyll Content ◽  
Foliar Application ◽  
Dry Weight ◽  
Beneficial Effects ◽  
Spad Value ◽  
Leaf Chlorophyll ◽  
Lettuce Growth ◽  
Mineral Concentrations

AbstractAmino acids have various roles in plant metabolism, and exogenous application of amino acids may have benefits and stimulation effects on plant growth and quality. In this study, the growth and nutrient uptake of Romain lettuce (Lactuca sativa subvar Sahara) were evaluated under spray of glycine or glutamine at different concentrations of 0 (as control), 250, 500 and 1000 mg.L-1, as well as a treatment of 250 mg.L-1 glycine+250 mg.L-1 glutamine. The results showed that there was significant increase in leaf total chlorophyll content under Gly250+Glu250, Gly250 and Glu1000 mg.L-1treatments, and in leaf carotenoids content under 250 mg.L-1 glutamine spray compared with the control plants. Shoot fresh and dry weights were highest under 500 mg.L-1 glycine, whereas root fresh weight was highest under 250 mg.L-1 glycine spray. Foliar application of glycine and glutamine had no significant increase in leaf mineral concentrations except for iron, in which 1000 mg.L-1Gly spray resulted in significantly higher leaf Fe concentration compared with the control plants. Leaf vitamin C was increased at 250 and particularly 500 mg.L-1 spray of glycine and glutamine compared with the control. Nevertheless, different amino acid treatments had no significant effect on plant height, leaf SPAD value, root dry weight, and leaf concentrations of N, K, Ca, Mg and Zn. The results indicate that foliar application of glycine and glutamine amino acids can have beneficial effects on lettuce growth, as higher fresh yield, leaf chlorophyll content and vitamin C were obtained by low to moderate concentrations of glycine and/or glutamine amino acids.

scholarly journals Changes of relative chlorophyll content at maize smut inoculated hybrids

2017 ◽  
pp. 55-58
Author(s):  
Dóra Frommer ◽  
László Radócz ◽  
Szilvia Veres
Keyword(s):  
Chlorophyll Content ◽  
Photosynthetic Activity ◽  
Plant Diseases ◽  
Physiological Status ◽  
Anthropogenic Stressors ◽  
Leaf Chlorophyll ◽  
Whole Plant ◽  
Maize Plants ◽  
Maize Smut ◽  
Relative Chlorophyll Content

The leaf chlorophyll content analysis is important for several reasons. The natural or anthropogenic stressors directly effect on the chlorophyll content. Through the measurement of the chlorophyll content it is possible to obtain data concerning the physiological status of the plant, moreover the chlorophyll content is closely related to the nitrogen content, so it is linked to photosynthesis and the photosynthetic activity which determine biomass production.One of the most common symptoms of plant diseases is the larger and smaller interveinal chlorotic areas. These might be local, or expand to the whole plant. There are multiply reasons of chlorosis such as reduction of chlorophyll content, unfavorable effects on the chlorophyll content,disorders regarding function of chloroplasts or ultimately destruction of the chloroplasts. Although such a chlorotic deviancy can contribute to significant losses in photosynthesis; however the underperformance photosynthesis of the sick plants is a more complex process.As we unambiguously experienced during our investigations on common smut that the infected maize plants most common accompanying symptom was chlorosis on the leaves, so it is especially important to examine how the infection influenced on the chlorophyll content of different hybrids.

scholarly journals Determination of barley nitrogen status with chlorophyll meter for high β-amylase in grains

1995 ◽  
Vol 4 (5-6) ◽  
pp. 495-501
Author(s):  
Jari Peltonen ◽  
Ari Virtanen ◽  
Jaakko Helenius ◽  
Juha Suopelto ◽  
Kari Kittilä ◽  
...  
Keyword(s):  
Grain Yield ◽  
Chlorophyll Content ◽  
Amylase Activity ◽  
Spring Barley ◽  
N Availability ◽  
Hordeum Vulgare L ◽  
Leaf Chlorophyll Content ◽  
Chlorophyll Meter ◽  
Leaf Chlorophyll

The production of β-amylase is of great importance in two-rowed spring barley cv. Kymppi (Hordeum vulgare L.) in the Finland, where long-day conditions favour high enzyme activities. Nitrogen (N) fertilization of a crop is the main means of manipulating barley β-amylase activity for industrial purposes. In this study, leaf chlorophyll content determined with a portable chlorophyll meter (Minolta SPAD-502) in the field, was used to predict N availability of cv. Kymppi for β-amylase production. Critical chlorophyll meter readings (SPAD values) were calculated from data deriving from experiments with various N fertilizer levels using the Cate-Nelson procedure. According to the results of this study it can be stated that the critical SPAD values at pollination (i.e. pollen grains on well-developed stigmatic hairs, GS 52-58) are 37 SPAD units for grain yield and 41 SPAD units for β-amylase activity. The optimum grain yield occurred at 41 SPAD units and optimum P-amylase activity was reached at 45 SPAD units. Determination of leaf chlorophyll content using the chlorophyll meter led to more appropriate fertilizer application recommendations and subsequently increased β-amylase activity in grains. Grain protein concentration could be an effective diagnostic tool for post-harvest evaluation of grain β-amylase activity in cv. Kymppi.

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