Reflectance estimation in cereal/pea intercropping system based on numerical images analysis method

2017 ◽  
Vol 51 (06) ◽  
Author(s):  
C. Benider ◽  
T. Madani ◽  
H. Bouzerzour ◽  
A. Guendouz
Keyword(s):  
Image Analysis ◽  
Arid Region ◽  
Growing Season ◽  
Analysis Method ◽  
Leaf Reflectance ◽  
Leaf Chlorophyll ◽  
Significant Difference ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Vegetal Cover

A Field experiment was carried out during the 2015-2016 growing season at Sersour experimental farm, located in the semi-arid region of Sétif (Algeria). The aim of this study was to evaluate the efficiency of using the numerical image analysis approach to estimate biomass and senescence by mean of appropriate software, the Mesurim Pro (Version 3.3). The results showed a significant difference between leaf reflectance at Red, Green and Blue light; results also registered a positive and significant correlation between leaf reflectance at red and blue, and senescence (r=0.78, r=0.50, respectively). This relationship between senescence and leaf reflectance indicate that the increase in leaf reflectance during senescence stage is due to degradation of leaf chlorophyll content. Over all, the numerical image analysis was very suitable approach to estimate reflectance of vegetal cover and the variation of some physiological traits.

scholarly journals Effect of the environment and diet on the physiological variables of sheep in the Brazilian semi-arid region

2019 ◽  
Vol 40 (2) ◽  
pp. 971
Author(s):  
Nayanne Lopes Batista Dantas ◽  
Bonifácio Benicio de Souza ◽  
Maycon Rodrigues da Silva ◽  
Gustavo de Assis Silva ◽  
João Paulo da Silva Pires ◽  
...  
Keyword(s):  
Arid Region ◽  
Climate Conditions ◽  
Physiological Variables ◽  
Genetic Groups ◽  
Randomized Design ◽  
Relative Air Humidity ◽  
Significant Difference ◽  
Globe Temperature ◽  
Semi Arid Region ◽  
Semi Arid

This study aimed to evaluate and compare the physiological variables of three sheep genotypes: Morada Nova, Somalis, and Dorper x Somalis crossbreed regarding the environment and diet in the Brazilian semi-arid region by using 30 animals (10 from each genetic group). Five of these animals had 30% of the tifton hay replaced by hairy woodrose hay. The temperature and relative air humidity were registered, the black globe temperature and humidity index (BGHI) was calculated, and the rectal temperature (RT), respiratory rate (RR), heart rate (HR), and surface temperature (ST) were measured in the morning and afternoon. The experimental design was a completely randomized design in a 3 × 2 × 2 factorial scheme, which consisted of three genotypes, two diets, and two periods, and five replications each. BGHI presented values of 81 in the shade and 90 in the sun and a significant difference (P < 0.05) was observed for the studied variables in relation to the periods, with higher values in the afternoon. The average ST was 35.48 °C in the morning and 38.11 °C in the afternoon. Morada Nova presented the lowest RT and RR (P < 0.05) among the genetic groups, with a higher tolerance to heat. The 30% substitution of tifton hay by hairy woodrose hay did not negatively affect the thermoregulatory capacity of sheep. The studied genetic groups were adapted and tolerant to climate conditions of the Brazilian semi-arid region.

Effects of shallow water table on capillary contribution, evapotranspiration, and crop coefficient of maize and winter wheat in a semi-arid region

2001 ◽  
Vol 52 (3) ◽  
pp. 317 ◽  
Author(s):  
Shaozhong Kang ◽  
Fucang Zhang ◽  
Xiaotao Hu ◽  
Peter Jerie ◽  
Lu Zhang
Keyword(s):  
Winter Wheat ◽  
Water Table ◽  
Arid Region ◽  
Crop Coefficient ◽  
Growing Season ◽  
Groundwater Table ◽  
Summer Maize ◽  
Semi Arid Region ◽  
Crop Coefficients ◽  
Semi Arid

A lysimeter experiment was conducted during 19866—96 to study the impacts of groundwater tables on the capillary contribution, evapotranspiration, and crop coefficient of maize and winter wheat grown in a semi-arid region in loess loam soils. The depth of groundwater table was set to 0.5, 0.8, 1.0, 1.2, 1.5, 2.0, and 2.50 m, respectively. The results showed that the rate of capillary contribution from groundwater to crop root-zone was influenced mainly by the depth of the water tables. The daily variation in capillary contribution was not the same as pan evaporation; the peak was delayed when the water table was >0.8 m, and the time of delay increased with the depth of water table. The crop evapotranspiration was decreased with increasing groundwater table in the early growth period and harvest period. The maximum evapotranspiration occurred at 1.2 m groundwater table in the other periods. Values of crop coefficients (K c ) were estimated based on the measured evapotranspiration (ET) and reference crop ET computed by the modified Penman method. The estimated K c was significantly different from the values computed and used in the region in the absence of groundwater table effects, and it varied markedly with groundwater tables. Relationships between the crop coefficient and the depth of groundwater table were developed using mean crop coefficients derived from multi-year data. It was found that linear model was better for the period Octobermp;mdash;February in the winter wheat growing season and June in the summer maize growing season. The polynomial model was suitable for the period March;mdahs;June in the winter wheat growing season and from July to October in the summer maize growing season.

scholarly journals Productive potential of watermelon under different plant spacings in the semi-arid region of Brazil

2021 ◽  
pp. 238-243
Author(s):  
Antônio Veimar da Silva ◽  
Carla Michelle da Silva ◽  
Caio Nunes Gonçalves ◽  
Manoel Cícero de Oliveira Filho ◽  
Caike de Sousa Pereira ◽  
...  
Keyword(s):  
Leaf Area ◽  
Arid Region ◽  
Growth Traits ◽  
Stem Diameter ◽  
Average Weight ◽  
Significant Difference ◽  
Number Of Leaves ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Plant Length

This study aimed to evaluate the growth and development of watermelon plants under different plant spacings in the Semi-arid region of Brazil. A randomized block experimental design was used with four treatments and eight replications. Data were submitted to analysis of variance and the Tukey test. The treatments were composed by the following spacings: T1: 3.0 x 0.8 m; T2: 3.0 x 0.6 m; T3: 2.0 x 0.8 m and T4: 2.0 x 0.6 m (spacings between rows and between plants, respectively). The plant length, number of leaves, stem diameter, leaf area, number of flowers, number of fruits per plant, average fruit weight, total fruit production, number of commercial fruits, average weight of commercial fruits, total weight of commercial fruits and percentage of commercial fruits were evaluated in this study. There was a significant difference in the growth traits: stem diameter and leaf area at 30 days after sowing (DAS), and plant length, stem diameter and number of leaves at 60 DAS, with no significant statistical difference in the remaining days and nor for the number of flowers. The watermelon plants showed adequate vegetative and productive development at the 2.0 x 0.8 m plant spacing in the edaphoclimatic conditions of the semi-arid region under study. This spacing is well suited to small producers in the semi-arid region, which are dependent on agriculture with small areas and can obtain good productivity with no need to use larger areas due to spacing

scholarly journals Physalis development according to the growing season in the semi-arid region of the Bahia state, Brazil

2018 ◽  
Vol 48 (4) ◽  
pp. 429-435
Author(s):  
Natália dos Santos Barroso ◽  
Josandra Souza Teles Fonseca ◽  
Marilza Neves do Nascimento ◽  
Claudinéia Regina Pelacani
Keyword(s):  
Arid Region ◽  
Block Design ◽  
Growing Season ◽  
Physicochemical Characteristics ◽  
Soluble Solids ◽  
Growing Period ◽  
Randomized Block Design ◽  
Maturation Stages ◽  
Semi Arid Region ◽  
Semi Arid

ABSTRACT The Physalis ixocarpa species has an interesting performance in hot and dry regions. However, there has been a lack of information about the influence of edaphoclimatic conditions, during the growing period, on the physical and physicochemical characteristics of the fruits. This study aimed to evaluate the characteristics of ‘purple' and ‘green' fruits of the P. ixocarpa species, according to the growing season, in the semi-arid region of the Bahia state, Brazil. A randomized block design was used, in a 2 x 2 x 5 factorial scheme (variety x growing season x fruit maturation stages), with three replications. The following characteristics were evaluated: color, fresh weight, length, diameter and total soluble solids contents of the fruits. The changes in the characteristics of the fruits follow the same tendency during maturation, for both evaluated varieties, with the best characteristics being observed when the calyx is green, with dry parts, completely expanded and ruptured. The growing season has a significant effect on the characteristics of the fruits, with May to August presenting the best environmental conditions for growing in the semi-arid region of the Bahia state.

scholarly journals Scorpion diversity in two types of seasonally dry tropical forest in the semi-arid region of Northeastern Brazil

2013 ◽  
Vol 13 (2) ◽  
pp. 340-344 ◽  
Author(s):  
Rodrigo Felipe Rodrigues Carmo ◽  
Heyde Polyana Amorim ◽  
Simão Dias Vasconcelos
Keyword(s):  
Arid Region ◽  
Abundant Species ◽  
Dry Forest ◽  
Northeastern Brazil ◽  
Pitfall Traps ◽  
Short Term ◽  
Seasonally Dry ◽  
Significant Difference ◽  
Semi Arid Region ◽  
Semi Arid

Knowledge on arthropod assemblages in the Brazilian semideciduous dry forest (caatinga) is scarce, despite the increasing exposure to degradation due to human activities such as logging and intensive agriculture. We performed a short-term survey on the diversity of scorpions in two types of caatinga (hipoxerophytic and hiperxerophytic) in Pernambuco State, Northeastern Brazil. A combination of active collection and pitfall traps was used to sample soil scorpions. Six species belonging to two families were registered: Bothriurus asper, Bothriurus rochai (Bothriuridae), Tityus stigmurus, Tityus pusillus, Rhopalurus rochai and Ananteris franckei (Buthidae). There was no significant difference in the richness and the abundance of scorpions in the two types of caatinga. Bothriurus asper was the most abundant species in both environments. Regarding constancy, all species were classified as accidental.

Multisource ERS-1 and optical data for vegetal cover assessment and monitoring in a semi-arid region of Algeria

1998 ◽  
Vol 19 (18) ◽  
pp. 3551-3568 ◽  
Author(s):  
Y. Smara ◽  
A. Belhadj-Aissa ◽  
B. Sansal ◽  
J. Lichtenegger ◽  
A. Bouzenoune
Keyword(s):  
Arid Region ◽  
Optical Data ◽  
Assessment And Monitoring ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Vegetal Cover

The Molecular Characterization and Biological Assessment of the Leaves Extracts of Loofah Reveal their Nutraceutical Potential

2020 ◽  
Vol 11 ◽  
Author(s):  
Takoua Ben Hlel ◽  
Feten Belhadj ◽  
Fatih Gül ◽  
Muhammed Altun ◽  
Ayşe Şahin Yağlıoğlu ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Phenolic Compounds ◽  
Hela Cell ◽  
Arid Region ◽  
Biological Properties ◽  
Biological Assessment ◽  
Omega 3 ◽  
Hela Cell Lines ◽  
Semi Arid Region ◽  
Semi Arid

Background:: Luffa cylindrica is a plant that is widely distributed in Africa and Asia and it can be grown in regions with tropical or subtropical climates. Few patents dealt with Loofah biological properties, including some functional foods formulated from its leaves. Objective:: This study aimed to structurally and functionally characterize the bioactive compounds of L. cylindrica leaves grown in two different environments. Methods:: The extracts of L. cylindrica leaves collected from two Tunisian locations: Essouasi (LE), a semi-arid region and Medenine (LM) an arid region, were investigated for their phenolic compounds and fatty acids using HPLC/TOF-MS and GCMS techniques respectively. Furthermore, the antioxidant capacity was evaluated with DPPH, Chelating effect, Hydroxyl radical and Superoxide anion scavenging activities while the anticancer activity against HeLa cell lines was assessed using xCELLigence real time cell analyzer and lactate dehydrogenase cytotoxicity assay. Results:: The antiproliferative capacity of both extracts was time and dose-dependent with LE presenting the lowest HeLa cell index (CI = 0.035 ± 0.018, 250 μg/ml). LE also showed the best cytotoxic capacity (56.49 ± 0.8%) and antioxidant potential (IC50 = 54.41 ± 1.12 μg/ml for DPPH and 12.12 ± 0.07 μg/ml for chelating effet). 14 phenolic compounds were detected in LE with ferulic acid being the major compound (5128.5 ± 4.09 μg Phenols/g) while LM had only 6 phenolics. GCMS analysis showed the presence of omega-3 fatty acids in LE. Conclusions:: Our findings suggest that L. cylindrica leaves, especially when collected from semi-arid regions, are promising for formulating nutraceuticals of interest.

Space-time monitoring of soil organic carbon content across a semi-arid region of Australia

2021 ◽  
Vol 24 ◽  
pp. e00367
Author(s):  
Patrick Filippi ◽  
Stephen R. Cattle ◽  
Matthew J. Pringle ◽  
Thomas F.A. Bishop
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Content ◽  
Arid Region ◽  
Space Time ◽  
Organic Carbon Content ◽  
Soil Organic Carbon Content ◽  
Semi Arid Region ◽  
Semi Arid
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