scholarly journals Quantification of light interception within image-based 3-D reconstruction of sole and intercropped canopies over the entire growth season

2020 ◽  
Vol 126 (4) ◽  
pp. 701-712 ◽  
Author(s):  
Binglin Zhu ◽  
Fusang Liu ◽  
Ziwen Xie ◽  
Yan Guo ◽  
Baoguo Li ◽  
...  
Keyword(s):  
Plant Architecture ◽  
Near East ◽  
Light Interception ◽  
Light Distribution ◽  
Phenotypic Traits ◽  
Canopy Architecture ◽  
Radiation Model ◽  
Significant Difference ◽  
East West ◽  
Canopy Light Interception

Abstract Background and Aims Light interception is closely related to canopy architecture. Few studies based on multi-view photography have been conducted in a field environment, particularly studies that link 3-D plant architecture with a radiation model to quantify the dynamic canopy light interception. In this study, we combined realistic 3-D plant architecture with a radiation model to quantify and evaluate the effect of differences in planting patterns and row orientations on canopy light interception. Methods The 3-D architectures of maize and soybean plants were reconstructed for sole crops and intercrops based on multi-view images obtained at five growth dates in the field. We evaluated the accuracy of the calculated leaf length, maximum leaf width, plant height and leaf area according to the measured data. The light distribution within the 3-D plant canopy was calculated with a 3-D radiation model. Finally, we evaluated canopy light interception in different row orientations. Key Results There was good agreement between the measured and calculated phenotypic traits, with an R2 >0.97. The light distribution was more uniform for intercropped maize and more concentrated for sole maize. At the maize silking stage, 85 % of radiation was intercepted by approx. 55 % of the upper canopy region for maize and by approx. 33 % of the upper canopy region for soybean. There was no significant difference in daily light interception between the different row orientations for the entire intercropping and sole systems. However, for intercropped maize, near east–west orientations showed approx. 19 % higher daily light interception than near south–north orientations. For intercropped soybean, daily light interception showed the opposite trend. It was approx. 49 % higher for near south–north orientations than for near east–west orientations. Conclusions The accurate reconstruction of 3-D plants grown in the field based on multi-view images provides the possibility for high-throughput 3-D phenotyping in the field and allows a better understanding of the relationship between canopy architecture and the light environment.

scholarly journals Optimizing Peach Tree Canopy Architecture for Efficient Light Use, Increased Productivity and Improved Fruit Quality

Agronomy ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1961
Author(s):  
Brendon M. Anthony ◽  
Ioannis S. Minas
Keyword(s):  
Fruit Quality ◽  
Maximum Yield ◽  
Light Interception ◽  
High Density ◽  
Tree Canopy ◽  
Light Distribution ◽  
Yield Potential ◽  
Canopy Architecture ◽  
Training Systems ◽  
Cost Of Production

Peach production in the USA has been in decline in recent decades due to poor fruit quality, reduced consumption and increased cost of production. Productivity and fruit quality can only be enhanced in the orchard through optimizing preharvest factors such as orchard design and training systems. Transition from low-density plantings (LDP) to high-density plantings (HDP) in peach is associated with the availability of reliable size controlling rootstocks. Increased densities must be combined with modern training systems to diffuse vigor and further increase light interception and yields, while optimizing light distribution, fruit quality and cost of production. Several training systems have been tested in peach with various objectives and goals, such as increasing light, water use and labor efficiencies, along with designing canopy architectures to facilitate mechanization and robotics. In general, increased planting densities increase yields, but excessive densities can promote shade, while excessive crop load can deteriorate quality. An ideal peach cropping system should optimize light interception and light distribution to balance maximum yield potential with maximum fruit quality potential. Successful management of high-density peach fruiting wall systems can lead to enhanced and uniform fruit quality, and ensure a sustainable industry.

scholarly journals Competition for Light Interception in Cotton Populations of Different Densities

Agronomy ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 176
Author(s):  
Huanxuan Chen ◽  
Xinxin Zhao ◽  
Yingchun Han ◽  
Fangfang Xing ◽  
Lu Feng ◽  
...  
Keyword(s):  
Spatial Competition ◽  
Grid Method ◽  
Spatial Arrangement ◽  
Light Interception ◽  
Agricultural Science ◽  
Shade Avoidance ◽  
Canopy Architecture ◽  
Growing Period ◽  
Plant Densities ◽  
Competition For Light

Modification of the cotton canopy results in shade avoidance and competition for light, which shows that density and spatial arrangement of cotton have a great impact on light interception. This experiment was conducted in 2018 and 2019 in the experimental field at the Institute of Cotton Research of Chinese Academy of Agricultural Science in Anyang city, Henan Province, China. Six plant densities of cotton variety SCRC28 were used to assess spatial competition for light in cotton populations during the whole growing period. Light interception data were collected and analyzed according to the spatial grid method and the extension of Simpson’s 3/8 rule. The results showed that at the bottom of the canopy, greater light interception was observed at high densities than at low densities, while in the external part of the layer of the canopy in the horizontal direction, low light interception was recorded at low densities. Leaf area, aboveground biomass and plant height were obviously correlated with light interception, and the cotton population with a higher density (8.7 plants m−2) performed best at the light interception competition, and with the highest yield. The results will provide guidance on light management through the optimization of the structure of the canopy to provide more solar radiation and a significant basis by which to improve the management of light and canopy architecture.

scholarly journals 115 Nitrogen fertilizer effects on above ground sward characteristics and beef heifer performance from native warm-season grass blends

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 26-27
Author(s):  
Caroline Chappell ◽  
Landon Marks ◽  
Katie Mason ◽  
Mary K Mullenix ◽  
Sandra L Dillard ◽  
...  
Keyword(s):  
Nutritive Value ◽  
Warm Season ◽  
Ground Cover ◽  
Application Rate ◽  
Light Interception ◽  
Botanical Composition ◽  
Forage Production ◽  
Beef Heifers ◽  
Fertilizer Application Rate ◽  
Canopy Light Interception

Abstract A 2-yr study was conducted at Black Belt Research and Extension Center in Marion Junction, AL, to evaluate the effect of nitrogen (N) fertilizer application rate on forage production characteristics, nutritive value, and animal performance of beef heifers grazing a mixture of native warm-season grasses (NWSG) including big bluestem, little bluestem, and indiangrass. Six, two-hectare plots were randomly assigned to one of two treatments (0 or 67 kg N ha-1 applied in early April; n = 3 replications per treatment). Paddocks were continuously stocked with four weaned Angus × Simmental beef heifers (initial BW 288 ± 7 kg) from late May/early June through mid-to-late August during 2018 (73 grazing d) and 2019 (70 grazing d), respectively. Put-and-take cattle were used to manage forage to a target of 38 cm. Forage mass and canopy heights were collected every two weeks during the trial. Visual ground cover ratings, canopy light interception, and botanical composition were measured at the beginning and end of the trial in each year. Hand-plucked samples were collected every two weeks during the grazing trial to determine forage nutritional value. Data were analyzed using the PROC MIXED procedure in SAS 9.4, and differences were declared significant when P ≤ 0.05. Nitrogen fertilized NWSG had greater crude protein (P < 0.0001), sward heights (P = 0.0003), and canopy light interception at the beginning of the season (P = 0.0049) compared to non-fertilized paddocks. However, there were no differences (P ≥ 0.05) among N-fertility treatments for mean forage mass, heifer ADG, or BCS across the 2-yr study. Botanical composition data indicated that indiangrass decreased from 64% to 61% (P = 0.0022) and weed pressure increased from 11% to 15% (P = 0.0064) across the summer grazing season. Canopy light interception decreased by 51% from early June to August in fertilized NWSG and 26% in unfertilized paddocks, respectively. These data illustrate that NWSG systems may provide a viable grazing system in the summer months under reduced N inputs.

Canopy Architecture Affects Light Interception in Sweet Cherry Your

2012 ◽  
Author(s):  
Jingjin Zhang ◽  
Ruilong Luo ◽  
Patrick Scharf ◽  
Matthew Whiting ◽  
Qin Zhang
Keyword(s):  
Sweet Cherry ◽  
Light Interception ◽  
Canopy Architecture

Leaf architecture of terrestrial and epiphytic ferns from an Araucaria forest in southern Brazil

Botany ◽  
2013 ◽  
Vol 91 (11) ◽  
pp. 768-773 ◽  
Author(s):  
L. Larcher ◽  
M.R.T. Boeger ◽  
P. Soffiatti ◽  
T.I. Da Silveira
Keyword(s):  
Plant Architecture ◽  
Mechanical Design ◽  
Light Interception ◽  
Leaf Position ◽  
Southern Brazil ◽  
Leaf Architecture ◽  
Leaf Form ◽  
Araucaria Forest ◽  
Maximum Light ◽  
Rigid Structure

Studies of angiosperms have associated the mechanical design of petioles with leaf form and the occurrence of simple and compound leaves. Petiole anatomy can respond differently, according to different leaf forms, to maintain plant architecture. The present study evaluated whether this premise applies to fern leaf architecture. Leaves of five ferns (Blechnum binervatum (Poir.) C.V. Morton & Lellinger, Ctenitis falciculata (Raddi) Ching, Megalastrum connexum (Kaulf.) A.R. Smith & R.C. Moran, Microgramma squamulosa (Kaulf.) de la Sota, and Serpocaulon catharinae (Langsd. & Fisch.) A.R. Sm.) from a remnant of an Araucaria Forest in southern Brazil were collected and their morphological and anatomical traits were analyzed. Results indicate that the biomechanical patterns of these terrestrial and epiphytic ferns are similar to those reported for angiosperms, except for the presence of subepidermal sclerenchyma in fern petioles. Independently of leaf form, the rigid structure of fern petioles appears to be an important adaptation to biomechanically support leaf position for maximum light interception in forest understories.

scholarly journals Pasture characteristics of Italian ryegrass and milk production under different management strategies

2012 ◽  
Vol 47 (6) ◽  
pp. 863-868 ◽  
Author(s):  
Marcolino Frederico Miguel ◽  
Henrique Mendonça Nunes Ribeiro Filho ◽  
Steben Crestani ◽  
Fabiana da Rocha Ramos ◽  
Tereza Cristina Moraes Genro
Keyword(s):  
Dry Matter ◽  
Nutritional Value ◽  
Lolium Multiflorum ◽  
Management Strategies ◽  
Growing Season ◽  
Light Interception ◽  
Italian Ryegrass ◽  
Neutral Detergent Fiber ◽  
Low Light ◽  
Canopy Light Interception

The objective of this work was to assess the effects of the sward structure of Italian ryegrass (Lolium multiflorum), during the first grazing cycle, on its morphological and bromatological characteristics throughout the growing season, and on the performance of dairy cows. The treatments consisted of two structures obtained as a function of canopy-light interception: high-light interception (HLI) and low-light interception (LLI), with different pre-grazing heights in the first grazing cycle. Pasture was managed under rotational grazing with a herbage allowance not below 30 kg dry matter (DM) per cow per day. Three grazing cycles, with a grazing interval of 30 days, were evaluated. Pre-grazing herbage mass was greater (2,240 vs. 1,656 kg ha-1 DM), but the proportion of leaf blades was smaller (0.35 vs. 0.43) for HLI swards. Neutral detergent fiber (NDF) content and organic matter digestibility (OMD) were similar between treatments in the first grazing cycle, but in the second and third ones NDF was greater, and OMD lower, for the HLI swards. Milk yields were greater for cows grazing LLI swards (19.4 vs. 21.1 kg per day). Initial grazing with 90% of light interception promotes greater nutritional value in the subsequent cycles.

scholarly journals Variation of Phenotypic Traits in Twelve Bambara Groundnut (Vigna subterranea (L.) Verdc.) Genotypes and Two F2 Bi-Parental Segregating Populations

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1451
Author(s):  
Xiuqing Gao ◽  
Aliyu Siise Abdullah Bamba ◽  
Aloyce Callist Kundy ◽  
Kumbirai Ivyne Mateva ◽  
Hui Hui Chai ◽  
...  
Keyword(s):  
Southern Africa ◽  
Negative Relationship ◽  
Principal Component ◽  
Bambara Groundnut ◽  
Structured Populations ◽  
Phenotypic Trait ◽  
Phenotypic Traits ◽  
Potential Contribution ◽  
Vigna Subterranea ◽  
East West

Underutilised species such as bambara groundnut (Vigna subterranea (L.) Verdc.) have the potential to contribute significantly to meeting food and nutritional needs worldwide. We evaluated phenotypic traits in twelve bambara groundnut genotypes from East, West and Southern Africa and Southeast Asia and two F2 bi-parental segregating populations derived from IITA-686 ×Tiga Nicuru and S19-3 ×DodR to determine phenotypic trait variation and their potential contribution to the development of improved crop varieties. All phenotypic traits in twelve genotypes were significantly influenced (p < 0.01) by genotypes. Principal component analysis (PCA) showed that PC1 accounted for 97.33% variation and was associated with four genotypes collected from East and Southern Africa. PC2 accounted for 2.48% of the variation and was associated with five genotypes collected from East, West and Southern Africa. Transgressive segregation for a number of traits was observed in the two F2 bi-parental populations, as some individual lines in the segregating populations showed trait values greater or less than their parents. The variability between twelve genotypes and the two F2 bi-parental segregating populations and the negative relationship between plant architectural traits and yield related traits provide resources for development of structured populations and breeding lines for bambara groundnut breeding programme.

scholarly journals The Relationship Between Adherence to the Mediterranean Diet and Body Composition in Nutrition and Dietetic Students

2020 ◽  
Vol 79 (OCE2) ◽  
Author(s):  
Servet Madencioğlu ◽  
Sevinç Yücecan
Keyword(s):  
Physical Activity ◽  
Body Composition ◽  
Waist Circumference ◽  
Mediterranean Diet ◽  
Near East ◽  
Female Students ◽  
Significant Difference ◽  
The Mediterranean ◽  
Nutrition And Dietetics ◽  
The Relationship

AbstractIntroductionThe determination of level of adherence to the Mediterranean diet (MD) in young adults has been investigated in countries situated near the Mediterranean region generally. The main purpose of this study were to determine differences in body composition by gender and level of adherence to the MD and to determine the relationship between body composition and level of adherence to the MD in Nutrition and Dietetics students at Near East University in Cyprus.Materials and MethodsThe study was conducted on 126 Nutrition and Dietetics students, aged 18 to 32 years. MDS was calculated, and then classified into three groups: good (36–55 points), moderate (21–35 points), and poor (0–20 points). Body composition was assessed using bioelectrical impedance (BIA). Anthropometrical measurements; height (H), body weight (BW), waist circumference (WC) and hip circumference (HC) were assessed according to standardized procedures and physical activity (PA) was assessed by using International Physical Activity Questionnaire (IPAQ-short form). The study protocol was approved by the Ethics Committee at Near East University.ResultsAccording to study results 31.0% of students were found out to low adherence, while 69.0% of students had moderate adherence to the MD. There is no student had high adherence to the MD. There was no significant difference (p = 0.877) between the male and female students in terms of adherence to Mediterranean diet. The findings indicate that the eating habits of the Nutrition and Dietetics students, even those studying nutrition, are in need of improvement. The results show that 78.6% of students were normal and 21.4% of students were overweight and obese. Male students’ BW (p = 0.000), WC (p = 0.000) and HC (p = 0.015) were higher than females’, while female students’ fat mass (FM) (p = 0.000) was higher than males’. However, there is no significant difference between BW (p = 0.724), FM (p = 0.896), BMI (p = 0.691), WC (p = 0.632) and HC (p = 0.982) neither low adherence nor moderate adherence to the MD. Most of students minimal active according to IPAQ scores (41.2%) and there is no significant difference IPAQ score and adherence to the MD (p = 0.923).DiscussionOne of the healthiest diets worldwide is the traditional MD. Several studies have shown, that higher adherence to the MD is inversely related with BMI, waist circumference (WC) and waist-to-height ratio (WHR). Little is known of how adherence to the MD is related to body composition, especially in university students. Further large-scale studies are required to clarify the relationship between adherence to the MD and body composition

Natural fractures in the Triassic tight sandstones of the Dongpu Depression, Bohai Bay Basin, eastern China: The key to production

2020 ◽  
Vol 8 (4) ◽  
pp. SP71-SP80
Author(s):  
Zhaosheng Wang ◽  
Lianbo Zeng ◽  
Zhouliang Luo ◽  
Kewei Zu ◽  
Haigang Lao ◽  
...  
Keyword(s):  
Crude Oil ◽  
Near East ◽  
Oil Production ◽  
Natural Fracture ◽  
Natural Fractures ◽  
Tight Sandstone ◽  
Thin Sections ◽  
Crude Oil Production ◽  
Dongpu Depression ◽  
East West

Natural fractures are identified as high-quality storage space and seepage channels for the Triassic tight sandstone reservoirs in the Dongpu Depression, playing an important role in tight sandstone oil production. We have evaluated natural fracture growth at different scales using outcrops, cores, thin sections, and imaging logs and analyzed the correlation between fractures and crude oil production capacity with production data. Results show that natural fractures primarily are distributed in fine sandstones and siltstones, which mostly are shear fractures of near east–west and northeast–southwest strikes. The natural fractures of near east–west strikes generally are parallel to the present-day maximum horizontal principal stress with the biggest apertures and the highest permeability, which are the main seepage channels, next being the fractures of northeast–southwest strike. The natural fractures of near east–west strikes also are the most important contributors to the crude oil production in the Triassic tight sandstones of the Dongpu Depression. The intensity, permeability, and direction of natural fractures govern the crude oil productivity in the per-unit sandstone thickness.

scholarly journals Skin color variation: A study on Eastern and North East India

2019 ◽  
Vol 10 (3) ◽  
pp. 13-16
Author(s):  
Sumit Maitra ◽  
Diptendu Chatterjee ◽  
Arup Ratan Bandyopadhyay
Keyword(s):  
Ethnic Groups ◽  
Skin Color ◽  
Skin Pigmentation ◽  
Color Space ◽  
Color Variation ◽  
Phenotypic Traits ◽  
North East India ◽  
North East ◽  
Wide Range ◽  
Significant Difference

Background: Skin pigmentation is one of the most variable phenotypic traits and most noticeable of human polymorphisms. Skin pigmentation in humans is largely determined by the quantity and distribution of the pigment melanin. The literature review on skin color variation revealed a few works on skin pigmentation variation has been conducted in India from Southern, Western and Northern part. Aims and Objectives: To best of the knowledge, the present discourse is the first attempt to understand skin color variation from Eastern and North Eastern part of India among three populations. Materials and Methods: The present study consisted of 312 participants from Chakma and Tripuri groups of Tripura, North East India, and participants from Bengalee Hindu caste population from West Bengal. Skin color was measured by Konica Minolta CR-10 spectrophotometer which measures and quantifies the colors with a 3D color space (CIELAB) color space created by 3 axes. All the skin color measurements from each participant were taken from unexposed (underarm) left and right to get a mean and exposed (forehead) to sunlight. Results: The distribution of skin color variation among the three populations demonstrated significant (p<0.05) difference in lightness for unexposed and exposed indicating lightness in unexposed area. Furthermore, the present study revealed significant difference (p<0.05) in skin color among the ethnic groups across the body location and all three attributes (lightness, redness and yellowness). Conclusion: Generally, skin color variation may be elucidated by two main factors: individual differences in lightness and yellowness and by and large due to ethnicity, where diversity in redness is due to primarily due to different body locations. Variation in lightness have more characteristic probability. The present study first time reports the wide range of quantitative skin color variation among the three ethnic groups from Eastern and North East India and highest yellowness (b*) among the population from North East India.

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