Revista Caatinga最新文献

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Sample size to evaluate the degree of multicollinearity in rye morphological traits 用于评估黑麦形态性状多重共线性程度的样本量
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n123rc
I. Neu, A. Cargnelutti Filho, M. Toebe, Fernanda Carini, R. Pezzini, D. L. Silveira
{"title":"Sample size to evaluate the degree of multicollinearity in rye morphological traits","authors":"I. Neu, A. Cargnelutti Filho, M. Toebe, Fernanda Carini, R. Pezzini, D. L. Silveira","doi":"10.1590/1983-21252023v36n123rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n123rc","url":null,"abstract":"ABSTRACT Investigation of multicollinearity allows parameters in multivariate analysis to be estimated with higher precision and with biological interpretation. In order to generate reliable estimates of the degree of multicollinearity, it is necessary to use appropriate sample size. Thus, the objectives of this study were to determine the sample size (number of plants) necessary to estimate the indicators of the degree of multicollinearity - condition number (CN), correlation matrix determinant (DET), and variance inflation factor (VIF) - in morphological traits of rye and to verify the variability of the sample size between the indicators. Five and three uniformity trials were conducted with the cultivars BRS Progresso and Temprano, respectively. Eight morphological traits were evaluated in 780 plants in eight trials. For each trial, 22 cases were selected among the 28 formed by the combination of eight traits, taken six by six, totaling 176 cases. In each case, 197 sample sizes were planned (20, 25, 30, ..., 1,000 plants) and in each size 2,000 resampling procedures with replacement were performed, CN, DET, and VIF were determined and the average among 2,000 estimates was calculated. For each case and indicator (CN, DET, and VIF), the sample size was determined through three models: modified maximum curvature method and linear and quadratic segmented models with plateau response. There is variability between sample sizes between indicators, with larger sample sizes required for DET, followed by CN and VIF, in that order, with at least 180, 116 and 85 plants, respectively.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44976174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exchange of germoplasm and genetic diversity to enrichment the Desmanthus genebank 利用种质交换和遗传多样性丰富枳实基因库
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n104rc
A. V. C. D. Silva, Isa M. R. do Nascimento, J. Rangel, C. Pereira, E. N. Muniz
{"title":"Exchange of germoplasm and genetic diversity to enrichment the Desmanthus genebank","authors":"A. V. C. D. Silva, Isa M. R. do Nascimento, J. Rangel, C. Pereira, E. N. Muniz","doi":"10.1590/1983-21252023v36n104rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n104rc","url":null,"abstract":"ABSTRACT The genus Desmanthus presents wide ecogeographical distribution and complex taxonomy. Desmanthus pernambucanus (L.) Thellung, popularly known in Brazil as Jureminha, is a leguminous species native to the Northeast region of Brazil, which stands out by its high protein content, resistance to droughts, and by presenting no toxicity to animals. The objective of this work was to evaluate the genetic diversity of 15 progenies from the Commonwealth Scientific and Industrial Research Organization (CSIRO; Australia), through germplasm exchange for enrichment of the Desmanthus genebank of Embrapa Tabuleiros Costeiros, in Nossa Senhora das Dores, SE, Brazil. Fifteen ISSR markers were used, from which 8 were selected. The progenies identified as 242, 245, 246, 255, and 268 were the most genetically distant, and the most recommended to be introduced to the genebank.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42075454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Conservation of seeds of cactaceae species endemic to the caatinga biome: Pilosocereus pachycladus and Tacinga inamoena caatinga生物群落特有仙人掌科物种的种子保护:Pilosocereus pachylladus和Tacinga inamoena
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n113rc
J. H. C. S. Silva, G. A. Azerêdo, V. C. D. Souza
{"title":"Conservation of seeds of cactaceae species endemic to the caatinga biome: Pilosocereus pachycladus and Tacinga inamoena","authors":"J. H. C. S. Silva, G. A. Azerêdo, V. C. D. Souza","doi":"10.1590/1983-21252023v36n113rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n113rc","url":null,"abstract":"ABSTRACT Ecosystems with dry soils are particularly sensitive to climate changes and anthropogenic actions, which represents a threat to the survival of many cactus species. Ex situ seed conservation strategies should be adopted to support in situ conservation. This study evaluated the effect of conservation conditions on germination and vigor of seeds of Pilosocereus pachycladus subsp. pernambucoensis and Tacinga inamoena. The seeds were packaged in paper bags and glass containers and stored under controlled (8 ± 1 °C; 56 ± 2% relative humidity) and non-controlled (24 ± 2 °C; 75 ± 5% relative humidity) environmental conditions for 0 (control), 12, 16, and 20 months. The experiment was conducted in a completely randomized design, in a 2 × 2 × 4 factorial arrangement (conservation environment × packaging × storage period) for each species. The variables evaluated were: water content (%), germination (%), germination speed index (GSI), and mean germination time (MGT). The physiological quality of seeds of both species were preserved when seeds were maintained under controlled environment, regardless of the packaging. However, when stored under non-controlled environment, the packaging in paper bags was more efficient for the conservation of seeds of P. pachycladus subsp. pernambucoensis, and the glass container was more efficient for T. inamoena. This information may be needed for ex situ conservation of these species and to support the recovery of degraded areas susceptible to desertification in the Caatinga biome.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45140350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management 农业生态管理下的生物源、中间源和物理源有机质团聚体
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n118rc
Celeste Q. Rossi, Luiz A. da S. R. Pinto, Octávio V. T. de Moura, A. Loss, M. G. Pereira
{"title":"Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management","authors":"Celeste Q. Rossi, Luiz A. da S. R. Pinto, Octávio V. T. de Moura, A. Loss, M. G. Pereira","doi":"10.1590/1983-21252023v36n118rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n118rc","url":null,"abstract":"ABSTRACT Agroecological management can favor the improvement of soil attributes, especially soil organic matter (SOM) and soil aggregation. The objective of the study was to quantify the carbon contents of the humic and oxidizable fractions of SOM of aggregates from different origins from agroecological management systems. Five experimental areas located in the Integrated Agroecological Production System were evaluated: AFS – Agroforestry System; C-SUN – Coffee in full sun; C-SHA – Shaded coffee; AL-FLE – Cultivation in alleys of Flemingia macrophylla with green beans; and NT – No-tillage. The aggregates were separated, identified, and classified as to their origin or formation pathways into biogenic, intermediate, and physicogenic. The carbon contents of the humic fractions fulvic acid (C-FAF), humic acid (C-HAF) and humin (C-HUMF); and oxidizable fractions (F1 and F2, labile; and F3 and F4, recalcitrant) of SOM were determined. The greatest variations in the carbon values of the humic fractions were observed in the aggregates of the AFS, C-SUN and C-SHA systems. In relation to C-HUMF, the highest contents of this fraction were quantified in the biogenic and intermediate aggregates of the C-SUN, C-SHA and AL-FLE systems. The carbon contents of the oxidizable fractions of SOM showed variability between the management systems, mainly for the F1, F2 and F3 fractions in the aggregates under C-SUN and C-SHA. The C-SUN system showed a higher proportion of more humified and recalcitrant fractions of SOM when compared to the C-SHA system. The management practices maids in the agroecological systems of C-SHA, C-SUN and AFS promoted improvements in soil quality.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45688810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Selection indexes and principal components for agronomic and bromatological traits in forage cactus 饲用仙人掌农艺性状和色泽性状的选择指标及主成分
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n120rc
Mariana S. de Jesus, A. Passos, R. P. Diniz
{"title":"Selection indexes and principal components for agronomic and bromatological traits in forage cactus","authors":"Mariana S. de Jesus, A. Passos, R. P. Diniz","doi":"10.1590/1983-21252023v36n120rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n120rc","url":null,"abstract":"ABSTRACT The objective of the present work was to compare selection indexes focused on the selection of forage cactus (Opuntia ficus-indica) accessions at initial generations. Sixty-five accessions from different locations in the semiarid region of the state of Bahia, Brazil, were evaluated in a randomized complete block design with three replications. Agronomic and bromatological traits were evaluated. The genetic parameters were predicted by using mixed models (REML/BLUP). The linear correlation degree between variables was estimated through Pearson's correlation analysis. Selection gains were predicted using four selection indexes: Smith-Hazel index, with two combinations of economic weights; rank sum index of Mulamba and Mock; and Elston's multiplicative index. The selection intensity applied was 30%, which allowed the selection of the 20 best accessions. The analysis of deviance showed significant effect for all traits. The estimate of genetic parameters evidenced the existence of genetic variability for the O. ficus-indica accessions. The Smith-Hazel index (combination 1) was important for primary (fresh weight and cladode dry weight) and bromatological traits (acid detergent fiber and neutral detergent fiber), expressing higher selection gains than the other indexes. The rank sum and multiplicative indexes resulted in selection gains for most evaluated traits. The results of accessions 2, 4, 5, 7, 9, 11, 14, 15, 18, 26, 27, 34, 37, 38, 39, 41, 45, 49, 51, 52, 53, and 58 were promising for their inclusion in breeding programs, as they were selected by at least two of the four selection indexes used.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48433675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Gas exchange, growth, and production of cotton genotypes under water deficit in phenological stages 缺水条件下棉花基因型在酚期的气体交换、生长和产量
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n116rc
L. A. A. Soares, Charles M. Felix, G. S. Lima, H. Gheyi, L. A. Silva, P. Fernandes
{"title":"Gas exchange, growth, and production of cotton genotypes under water deficit in phenological stages","authors":"L. A. A. Soares, Charles M. Felix, G. S. Lima, H. Gheyi, L. A. Silva, P. Fernandes","doi":"10.1590/1983-21252023v36n116rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n116rc","url":null,"abstract":"ABSTRACT Cotton cultivation in the Brazilian Northeast region faces water scarcity problems caused by the irregularity of the rainy season, leading to losses in yield. In this context, the objective of the present study was to evaluate the gas exchange, growth, and production of colored-fiber cotton genotypes under water stress, varying the water deficit management strategies in the different phenological stages of the plant. The study was carried out in the experimental area of the Federal University of Campina Grande, located in the municipality of Pombal, Paraíba, Brazil. A randomized block design was used, in a 3 × 7 factorial scheme, corresponding to three colored cotton genotypes (‘BRS Rubi’, ‘BRS Jade’, and ‘BRS Safira’) and application of water deficit (40% of actual evapotranspiration - ETr) management strategies in seven phenological stages of the crop. The ‘BRS Jade’ genotype is the most suitable for cultivation under water deficit conditions with 40% of the actual evapotranspiration. Colored-fiber cotton cultivation under water deficit in the flowering stage caused a reduction in physiological variables and growth. Water deficit during the vegetative and yield formation stages promoted lower losses in the production of seed cotton and total seed weight of the genotypes ‘BRS Rubi’, ‘BRS Jade’, and ‘BRS Safira’.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48830367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A New Spatial Model for Ecological Suitability Assessment of Irrigated Farming in Jahrom County, Iran 伊朗贾罗姆县灌溉农业生态适宜性评价的新空间模型
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n119rc
P. Jokar, M. Masoudi, B. Pradhan
{"title":"A New Spatial Model for Ecological Suitability Assessment of Irrigated Farming in Jahrom County, Iran","authors":"P. Jokar, M. Masoudi, B. Pradhan","doi":"10.1590/1983-21252023v36n119rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n119rc","url":null,"abstract":"ABSTRACT Agricultural suitability assessment is a process that requires spatial data, geo-information tools, and the expertise of a computer scientist to analyze the information. The main objective of this paper is to propose a new model (based on Iranian ecological model and Food and Agriculture Organization (FAO) model) for ecological suitability evaluation with geometric mean evaluation and calibration methods for better planning management of irrigated lands. Next, to verify and compare the proposed method with other well-known existing, methods such as, Boolean logic and MCE (WLC) models were used. For testing these models, normalized difference vegetation index (NDVI) was used. Findings of this research showed that the proposed model by geo-mean and calibration (kappa=0.79) is the best among used methods. On the contrary, arithmetic mean method showed the lowest accuracy (kappa=0). So, these methods (geometric mean evaluation and calibration) have high flexibility in locating agricultural lands. Overall, this study can be used as a basic framework to evaluate ecological suitability for other regions with similar conditions because of its simplicity and high precision.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45177357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Gas exchange and post-harvest quality of ‘Kent’ mango subjected to controlled water deficit in semi-arid region 半干旱区可控缺水条件下“肯特”芒果的气体交换和采后品质
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n117rc
Victor P. M. de Andrade, W. L. Simões, N. S. Dias, Jucicléia S. da Silva, Kaio V. F. Barbosa
{"title":"Gas exchange and post-harvest quality of ‘Kent’ mango subjected to controlled water deficit in semi-arid region","authors":"Victor P. M. de Andrade, W. L. Simões, N. S. Dias, Jucicléia S. da Silva, Kaio V. F. Barbosa","doi":"10.1590/1983-21252023v36n117rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n117rc","url":null,"abstract":"ABSTRACT Brazil is the seventh largest producer of mangoes in the world, and the São Francisco Valley is the main producing region, with ‘Kent’ as one of the main cultivars. Considering that irrigation management affects physiological events, production and fruit quality, the objective of this work was to evaluate the gas exchange in the leaves and fruit quality of ‘Kent’ mango subjected to controlled water deficit in the semi-arid region. The experiment was carried out in Petrolina-PE, semi-arid region of the São Francisco Valley. The experimental design used was randomized blocks, in a triple factorial scheme, with four irrigation depths (40, 60, 80 and 100% of crop evapotranspiration - ETc), three phenological stages (F1 - flowering, F2 - fruit growth, F3 - fruit maturation) and two production cycles (2018 and 2019), with four replicates. During the phenological stages, the physiological parameters of gas exchange were evaluated. After harvesting, the following parameters were evaluated: soluble solids content, titratable acidity, pH, firmness and peel color. Irrigation with a depth between 79.5 and 83.6% ETc during the evaluated stages promoted greater gas exchange in the leaves, greater firmness and acidity in the fruits. The reduction in irrigation depth in F1 and F3 reduced the soluble solids content, while in F2 the highest soluble solids content was obtained with irrigation between 68.24 and 74.5% ETc. The most suitable irrigation depth for ‘Kent’ mango cultivation depends on the purpose of the producer and on the phenological stage of the crop.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42352908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ornamental cherry tomatoes in different protected environments and reflector materials in cultivation Bench 观赏圣女果在不同保护环境和反射材料栽培台架上的应用
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n102rc
Ruth S. de Campos, E. Costa, D. F. Cavalcante, Rodolfo A. Freitas, F. F. D. S. Binotti
{"title":"Ornamental cherry tomatoes in different protected environments and reflector materials in cultivation Bench","authors":"Ruth S. de Campos, E. Costa, D. F. Cavalcante, Rodolfo A. Freitas, F. F. D. S. Binotti","doi":"10.1590/1983-21252023v36n102rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n102rc","url":null,"abstract":"ABSTRACT The study aimed to evaluate the growth of ornamental cherry tomato plants in different protected environments and reflective materials on the cultivation benches. As there were no repetitions of the protected environments, each environment was considered an experiment. In each environment, the experimental design used was completely randomized with five replications and three plants per plot. From the analysis of individual variances and evaluation of the mean squares of residues smaller than seven, the joint analysis of variance was performed (three protected environments x three reflective materials on the cultivation bench + 1 control without material). The protected environments evaluated were the agricultural greenhouse with a screen of 42-50% shading under the film, the agricultural screenhouse with a black screen of 30% shading, and the agricultural screenhouse with an aluminized screen of 35% shading. The reflective materials on the cultivation bench were Aluminet®, white Formica laminate, and red Formica laminate. The different protected environments influenced the growth of plants, and due to the lower incident light, the plants showed greater height in the agricultural greenhouse (42-50% shading). The reflective benches did not interfere with plant height but favored fruit production. The agricultural greenhouse (42-50% shading)) stands among the environments. For the reflective materials on the bench, aluminized fabric and red Formica laminate stood out, as they favored the growth of cherry tomato plants with desirable ornamental traits, such as greater fruit production.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41480971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Weed interference periods in cowpea crop 豇豆作物的杂草干扰期
IF 0.9 4区 农林科学
Revista Caatinga Pub Date : 2023-03-01 DOI: 10.1590/1983-21252023v36n101rc
Marcos L. de Campos, M. L. Lacerda, I. Aspiazú, A. Carvalho, Rafael F. Silva
{"title":"Weed interference periods in cowpea crop","authors":"Marcos L. de Campos, M. L. Lacerda, I. Aspiazú, A. Carvalho, Rafael F. Silva","doi":"10.1590/1983-21252023v36n101rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n101rc","url":null,"abstract":"ABSTRACT Cowpea is one of the pulse crops that present the highest potential for growing in the Semiarid region of Brazil. Lowcost vegetable protein source, it has resilience to adverse conditions, however, in competition with weeds, its productivity can be strongly compromised. To overcoming this situation, it is essential for integrated management programs to determine the critical period for preventing interference. Thus, the objective of this work was to determine weed interference periods and the effect of coexistence periods on cowpea grain yield in the Semiarid region of the state of Minas Gerais, Brazil. The treatments were arranged in a 2×9 factorial scheme, as follows: cultivation in coexistence with weeds and cultivation under weed control, for nine crescent periods (0-7, 0-14, 0-21, 0-28, 0-35, 0-42, 0-49, 0-56 and 0-63 days after crop emergence), in a randomized experimental block design with four replications. The weed community was studied through phytosociological survey and evaluation of dry matter production and cowpea was evaluated for dry matter production, 100-grain mass and grain yield. The interference periods were determined using a non-linear logistic regression model. The weed community found was composed of 70% dicotyledonous and 30% monocotyledon plants, distributed in seven families and ten species. The coexistence with weeds results in losses of up to 90% in cowpea grain yield. The critical period of weed control in cowpea crop in the Semiarid region of the state of Minas Gerais, Brazil, is 11 to 36 days after crop emergence.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48593180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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