scholarly journals Selectivity of Pre and Postemergence Herbicides in Single or Combined Applications in Castor Crop

Agronomy ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 19
Author(s):  
Augusto G. F. Costa ◽  
Valdinei Sofiatti ◽  
Cleber D. G. Maciel ◽  
Jalmi G. Freitas ◽  
Gleibson D. Cardoso ◽  
...  
Keyword(s):  
Weed Management ◽  
Arid Region ◽  
Field Experiments ◽  
Ricinus Communis ◽  
Northeast Brazil ◽  
Ricinus Communis L ◽  
Chlorimuron Ethyl ◽  
Semi Arid Region ◽  
Postemergence Herbicides ◽  
Semi Arid

One of the main challenges in castor crop (Ricinus communis L.) production is efficient weed management mainly due to limited options of selective herbicides. This study evaluated the selectivity of herbicides applied alone or in combination in pre- and postemergence applications in castor crop. Two field experiments were carried out under irrigation conditions in a semi-arid region of Northeast Brazil. It was found that the visual symptoms of phytointoxication of the herbicides used on castor were mild in both experiments. Consequently, there were no significant interferences on plant height, number of racemes, and grain (seed) yield. Pre-emergence applications (g ha−1) of trifluralin (1800), pendimethalin (1500), clomazone (750), clomazone + trifluralin (750 + 1800), and clomazone + pendimethalin (750 + 1500) followed by chlorimuron-ethyl in postemergence (15 g ha−1) are selective to castor. The application (g ha−1) of pendimethalin + clomazone (1000 + 500) in pre-emergence, associated with chlorimuron-ethyl (10 and 15), metamitron (2800 and 4200), ethoxysulfuron (60 and 80), or halosulfuron-methyl (75 and 112.5) in one or two applications in postemergence, as single or split applications, in an interval of 14 days, are selective to castor crop.

scholarly journals Effect of Temperature on Sowing Dates of Wheat under Arid and Semi-Arid Climatic Regions and Impact Quantification of Climate Change through Mechanistic Modeling with Evidence from Field

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 927
Author(s):  
Jamshad Hussain ◽  
Tasneem Khaliq ◽  
Muhammad Habib ur Rahman ◽  
Asmat Ullah ◽  
Ishfaq Ahmed ◽  
...  
Keyword(s):  
Climate Change ◽  
Grain Yield ◽  
Arid Region ◽  
Field Experiments ◽  
Climatic Conditions ◽  
Seasonal Temperature ◽  
Sowing Dates ◽  
Rcp 8.5 ◽  
Semi Arid Region ◽  
Semi Arid

Rising temperature from climate change is the most threatening factor worldwide for crop production. Sustainable wheat production is a challenge due to climate change and variability, which is ultimately a serious threat to food security in Pakistan. A series of field experiments were conducted during seasons 2013–2014 and 2014–2015 in the semi-arid (Faisalabad) and arid (Layyah) regions of Punjab-Pakistan. Three spring wheat genotypes were evaluated under eleven sowing dates from 16 October to 16 March, with an interval of 14–16 days in the two regions. Data for the model calibration and evaluation were collected from field experiments following the standard procedures and protocols. The grain yield under future climate scenarios was simulated by using a well-calibrated CERES-wheat model included in DSSAT v4.7. Future (2051–2100) and baseline (1980–2015) climatic data were simulated using 29 global circulation models (GCMs) under representative concentration pathway (RCP) 8.5. These GCMs were distributed among five quadrants of climatic conditions (Hot/Wet, Hot/Dry, Cool/Dry, Cool/Wet, and Middle) by a stretched distribution approach based on temperature and rainfall change. A maximum of ten GCMs predicted the chances of Middle climatic conditions during the second half of the century (2051–2100). The average temperature during the wheat season in a semi-arid region and arid region would increase by 3.52 °C and 3.84 °C, respectively, under Middle climatic conditions using the RCP 8.5 scenario during the second half-century. The simulated grain yield was reduced by 23.5% in the semi-arid region and 35.45% in the arid region under Middle climatic conditions (scenario). Mean seasonal temperature (MST) of sowing dates ranged from 16 to 27.3 °C, while the mean temperature from the heading to maturity (MTHM) stage was varying between 12.9 to 30.4 °C. Coefficients of determination (R2) between wheat morphology parameters and temperature were highly significant, with a range of 0.84–0.96. Impacts of temperature on wheat sown on 15 March were found to be as severe as to exterminate the crop before heading. The spikes and spikelets were not formed under a mean seasonal temperature higher than 25.5 °C. In a nutshell, elevated temperature (3–4 °C) till the end-century can reduce grain yield by about 30% in semi-arid and arid regions of Pakistan. These findings are crucial for growers and especially for policymakers to decide on sustainable wheat production for food security in the region.

Macroalgae Mariculture as a Social and Environmental Alternative for Coastal Traditional Communities of the Semi-Arid Region of Northeast Brazil

2020 ◽  
pp. 91-98
Author(s):  
Ivanilson de Souza Maia ◽  
Dárlio Inácio Alves Teixeira ◽  
Vigínia Maria Cavalari Henriques ◽  
Maulori Curié Cabral
Keyword(s):  
Arid Region ◽  
Northeast Brazil ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Traditional Communities

scholarly journals Helminths infecting the cat-eyed snake Leptodeira annulata Linnaeus 1758 (Squamata: Dipsadidae) in a semiarid region of Brazil

2018 ◽  
Vol 55 (4) ◽  
pp. 281-285
Author(s):  
E. F. Fernandes De Carvalho ◽  
A. Ferreira Da Silva-Neta ◽  
C. De Sousa Silva ◽  
C. R. De Oliveira ◽  
J. Da Cunha Xavier Nunes ◽  
...  
Keyword(s):  
Arid Region ◽  
Paratenic Host ◽  
Nematode Species ◽  
Helminth Fauna ◽  
Semiarid Region ◽  
Northeast Brazil ◽  
Semi Arid Region ◽  
Semi Arid

Abstract Snakes have diverse feeding and living habits, being exposed to a variety of endoparasite communities. However, more studies are still necessary to document these relationships. We examined 18 specimens of the cat-eyed snake Leptodeira annulata from a semi-arid region in Northeast Brazil. Eight taxa of parasites were found, with higher prevalence of cystacanths (Acanthocephala). Five nematode species (Hexametra boddaertii, Oswaldocruzia sp., Oxyascaris sp., Physaloptera sp. and Raillietnema spectans) and the pentastome Raillietiella furcocerca represent a new parasitism record for the host studied. Our results also showed that L. annulata could act as paratenic host for acanthocephalans. These results contribute to the knowledge of the helminth fauna of L. annulata.

FLORISTIC AND VEGETATIONAL ASPECTS OF AN INSELBERG IN THE SEMI-ARID REGION OF NORTHEAST BRAZIL

2009 ◽  
Vol 66 (2) ◽  
pp. 329-346 ◽  
Author(s):  
P. Gomes ◽  
M. Alves
Keyword(s):  
Species Richness ◽  
Arid Region ◽  
Floristic Composition ◽  
Northeastern Brazil ◽  
Northeast Brazil ◽  
Surrounding Area ◽  
Floristic Inventory ◽  
Exposed Rock ◽  
Semi Arid Region ◽  
Semi Arid

Inselbergs are rocky environments that support a unique flora distinct from that of the surrounding area. The objectives of this work were to conduct a floristic inventory of an inselberg in the semi-arid region of Northeast Brazil, and to investigate the relationship between its flora and the flora of the surrounding area. The following questions were addressed: is the species richness comparable to other inselbergs in northeastern Brazil; is the floristic composition of the inselberg more similar to other inselbergs or to the surrounding Caatinga vegetation; and do the similarities in the floristic composition of inselbergs depend on the distance between them? This work documents 201 species in 62 families. Cyperaceae (28 spp.), Euphorbiaceae (19), Poaceae (15), Orchidaceae (11) and Bromeliaceae (9) are the most species-rich families. On the inselberg the plants are distributed in islands found on exposed rock, in fissures and in depressions in the rock. Variations in species richness in the region were assessed by comparison of floristic inventories conducted in other inselbergs of the semi-arid region with those of this study. The flora of the inselberg under investigation is more similar to the flora of other nearby inselbergs than to the vegetation of the surrounding semi-arid region.

scholarly journals Analysis of the NDVI Temporal Dynamics in Semi-arid Ecosystems: Brazilian Caatinga and African Western Sahel (Análise da Dinâmica Temporal do NDVI nos Ecossistemas Semi-áridos: Caatinga Brasileira e Sahel Ocidental Africano)

2011 ◽  
Vol 4 (2) ◽  
pp. 300 ◽  
Author(s):  
Humberto Alves Barbosa ◽  
T.V. Lakshimi Kumar ◽  
Ivon Wilson da Silva Junior
Keyword(s):  
El Niño ◽  
Arid Region ◽  
Temporal Dynamics ◽  
El Nino ◽  
Arid Ecosystems ◽  
Northeast Brazil ◽  
Vegetation Types ◽  
Semi Arid Region ◽  
Semi Arid ◽  
African Sahel

Os resultados indicaram que o efeito causado pelo evento El Niño, nos vários tipos de vegetação na região semi-árida do Nordeste do Brasil, durante as duas últimas décadas do século passado, apresentou diferentes padrões sazonais e interanuais dos tipos de vegetação no Sahel africano. A amplitude sazonal na variação do Índice de Vegetação Diferença Normalizada – NDVI, no Sahel Africano não foi alterada pelo efeito climático do El Niño, no entanto, na região semi-árida do Nordeste do Brasil, os tipos de vegetação foram afetados durante os eventos El Niño. Além disso, observou-se que o NDVI varia de acordo com as condições climáticas locais, apresentando uma lacuna temporal entre a ocorrência de precipitação e absorção de água disponível na vegetação. Esta informação é importante para mostrar condições de contorno para os modelos climáticos e também para a previsão numérica de tempo.  Palavras-chave: Vegetação, Aridez . Satelite  Análise da Dinâmica Temporal do NDVI nos Ecossistemas Semi-áridos: Caatinga Brasileira e Sahel Ocidental Africano   ABSTRACT The results indicated that the effect caused by the El Niño event in the various types of vegetation in the semi-arid region of Northeast Brazil during the last two decades of the last century, presented a differing seasonal and interannual patterns from the vegetation types in the African Sahel. The seasonal amplitude of Normalized Difference Vegetation Index - NDVI variation in the African Sahel was not altered by the climatic effect of El Niño, however, in the semi-arid region of Northeast Brazil, the vegetation types were affected during the El Niño events. Furthermore, it was observed that the NDVI varies according to the local climatic conditions, presenting a temporal gap between the precipitation occurrence and water absorption available from the vegetation. This information is important to show contour conditions for climatic models and also for the weather numerical forecasting.   Keywords: Vegetation, drought, satellite.

scholarly journals Aspectos humanos, geográficos e meteorológicos do nordeste brasileiro

1998 ◽  
Vol 21 ◽  
pp. 21-26
Author(s):  
Julio Buchmann
Keyword(s):  
Arid Region ◽  
Northeast Brazil ◽  
Semi Arid Region ◽  
Strong Situation ◽  
Semi Arid

The survival human conditions of life in the Northeast Brazil is very hard. We have a very strong situation of proverty in the semi-arid region and this must be changed.

scholarly journals Economic and multivariate analysis of banana production (Musa sp.) Cultivated in the semi-arid region of northeast Brazil

2018 ◽  
Vol 5 (7) ◽  
pp. 9-17
Author(s):  
José Aluisio de Araújo Paula ◽  
Eudes de Almeida Cardoso ◽  
Vander Mendonça ◽  
Roberto Pequeno de Sousa ◽  
Stefeson Bezerra de Menezes ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Arid Region ◽  
Northeast Brazil ◽  
Banana Production ◽  
Musa Sp ◽  
Semi Arid Region ◽  
Semi Arid
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