Symbiotic and agronomic efficiency of new cowpea rhizobia from Brazilian Semi-Arid

ABSTRACT: The objective of this study was to evaluate the agronomic efficiency of intercropping combinations of carrot and arugula at different population densities in bicropping in the semi-arid conditions of the Brazilian Northeast. The study was conducted at the "Rafael Fernandes" Experimental Farm of the Universidade Federal Rural do Semi-Árido (UFERSA) during the period September 2011 to February 2012. The experimental design was of randomized complete blocks with treatments arranged in a 4 x 4 factorial scheme with four replications. The combinations were four population densities of carrot (40, 60, 80 and 100% of the recommended population in sole crop - RPSC) with four population densities of arugula (40, 60, 80 and 100% of the RPSC). The recommended population densities for sole crops of carrot and arugula are 500,000 and 1,000,000 plants per hectare, respectively. All treatments were fertilized with hairy woodrose (Merremia aegyptia L.), a spontaneous species of the Caatinga biome. The highest agronomic efficiency of carrot intercropped with arugula in bicropping was achieved in the combination of 40% of RPSC for the carrot and 100% of RPSC for the arugula. The commercial maximum yield (33.74 t ha-1) of carrot roots and the maximum yields of arugula green mass (8.06 and 2.67 t ha-1) in both cultivations were also obtained in the combination of population densities of 40% of RPSC for carrot and 100% of RPSC for arugula.

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Efficiency of nitrogen use by sesame genotypes under brazilian semi-arid conditions

Bioscience Journal ◽

10.14393/bj-v37n0a2021-48279 ◽

2021 ◽

Vol 37 ◽

pp. e37013

Author(s):

Manoel Galdino Dos Santos ◽

Rayanne Maria Paula Ribeiro ◽

Hamurábi Anizio Lins ◽

Giordanio Bruno Silva Oliveira ◽

José Ricardo Tavares de Alburquerque ◽

...

Keyword(s):

Nitrogen Loss ◽

Nitrogen Use ◽

Agronomic Efficiency ◽

Sesame Seeds ◽

Arid Conditions ◽

Use Efficiency ◽

Semi Arid Region ◽

Sesame Genotypes ◽

The Cost ◽

Semi Arid

Nitrogen (N) is an essential macronutrient for plant growth and rate applications can influence the performance of sesame, and when applied in excess can cause nitrogen loss in the environment, and consequently make the cost of production more costly to the producer. Therefore, the objective of this work was to evaluate the efficiency of nitrogen use by different cultivars of irrigated sesame seeds under the edaphoclimatic conditions of the northeastern semi-arid region in two harvests. The experiments were carried out from February to May (1st harvest) and from July to October (2nd harvest) in 2016. The treatments were arranged in a split plot scheme, in which the plots were the five nitrogen doses (0, 30, 60, 90 and 120 kg ha-1), and in the subplots, the four sesame genotypes (CNPA G2, CNPA G3, CNPA G4 and BRS Seda), the design was in randomized complete blocks with four replications. The nitrogen use efficiency assessments evaluated were: agronomic efficiency (AE), physiological efficiency (PE), agrophysiological efficiency (APE), recovery efficiency (RE) and efficiency of use (EU). The rate that provided the greatest efficiency of use was 30 kg ha-1 of N applied. The cultivar BRS Seda had greater efficiency of use in relation to the other cultivars studied. The crop that had better efficiency of use was the 2nd agricultural harvest.

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PRODUCTIVE VIABILITY AND PROFITABILITY OF CARROT-COWPEA INTERCROPPING USING DIFFERENT AMOUNTS OF Calotropis procera

Revista Caatinga ◽

10.1590/1983-21252019v32n107rc ◽

2019 ◽

Vol 32 (1) ◽

pp. 62-71

Author(s):

Francisco Bezerra Neto ◽

Maiele Leandro da Silva ◽

Jailma Suerda Silva de Lima ◽

Aurélio Paes Barros Júnior ◽

Italo Nunes Silva ◽

...

Keyword(s):

Calotropis Procera ◽

Net Income ◽

Productive Performance ◽

Agronomic Efficiency ◽

Land Equivalent Ratio ◽

Net Profit ◽

Alternative Farming ◽

Gross Income ◽

Semi Arid Region ◽

Semi Arid

ABSTRACT Intercropping system and the use of green manure with spontaneous species has been an alternative farming method applied to the productive sector of vegetables in the northeastern semi-arid region. The objective of this work was to determine which amount of Calotropis procera must be incorporated into the soil to provide the highest productive performance of the component crops and increase the profitability of the carrot and cowpea intercropping. The experimental design used was randomized complete blocks with five replicates. The treatments consisted of four amounts of C. procera incorporated into the soil: 10, 25, 40 and 55 t ha-1 on a dry basis. The characteristics evaluated in this intercropping system were: commercial productivity of carrot roots, yield of cowpea green grains, land equivalent ratios for component crops and for the intercropped system, score of the canonical variable of the association, and the economic indicators of gross income, net income, rate of return, and net profit margin. The maximum agronomic efficiency of the carrot x cowpea intercropping was reached at the land equivalent ratio of 1.12, using 43.39 t ha-1 of C. procera biomass incorporated in the soil, while the maximum economic efficiency of the carrot and cowpea crops association was obtained at the net income of R$ 17,856.43 ha-1, in the amount of 40.60 t ha-1 of C. procera biomass added to the soil.

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TECHNICAL-ECONOMIC EFFICIENCY OF THE YIELD OF GREEN GRAINS OF COWPEA FERTILIZED WITH ROOSTERTREE

Revista Caatinga ◽

10.1590/1983-21252018v31n227rc ◽

2018 ◽

Vol 31 (2) ◽

pp. 504-510 ◽

Cited By ~ 2

Author(s):

FLAVIANA DE ANDRADE VIEIRA ◽

FRANCISCO BEZERRA NETO ◽

MAIELE LEANDRO DA SILVA ◽

JAILMA SUERDA SILVA DE LIMA ◽

AURÉLIO PAES BARROS JÚNIOR ◽

...

Keyword(s):

Economic Efficiency ◽

Block Design ◽

Maximum Yield ◽

Rio Grande ◽

Dry Mass ◽

Economic Feasibility ◽

Calotropis Procera ◽

Net Income ◽

Agronomic Efficiency ◽

Semi Arid

ABSTRACT This study aimed to determine the doses of maximum agronomic and economic efficiency as a function of different amounts of roostertree [Calotropis procera (Ait.) R.Br.] biomass added to the soil, that results in the maximum yield of green grains of cowpea in the semi-arid of Rio Grande do Norte state, Brazil. The experiment was conducted at the “Rafael Fernandes” Experimental Farm of the Universidade Federal Rural do Semi-Árido (UFERSA), Alagoinha, RN, from August to November 2013. In the experiment was used a randomized completely block design with 5 replicates. The treatments consisted of 20, 35, 50, and 65 t ha-1 (on a dry matter basis) of roostertree biomass added to the soil. The evaluated characteristics were: number of green pods per m2, productivity and dry mass of green pods, number of green grains per pod, weight of 100 green grains, and dry mass of green grains. The following economic indicators were determined: gross and net incomes, production operational costs, rate of return, and profit margin. The maximum agronomic efficiency of the yield of cowpea green grain was reached at the yield of 3.05 t ha-1, using 61.0 t ha-1 of roostertree biomass in the soil. The maximum economic efficiency yielded a net income of R$ 8,701.42, at the production of 3.02 t ha-1 green grains with 53.57 t ha-1 of roostertree biomass added to the soil. The use of roostertree as a green manure presents technical-economic feasibility in cowpea cultivation for green grains in the semi-arid conditions of Rio Grande do Norte.

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Integrated soil fertility management enhances population and effectiveness of indigenous cowpea rhizobia in semi-arid eastern Kenya

Applied Soil Ecology ◽

10.1016/j.apsoil.2010.05.008 ◽

2010 ◽

Vol 45 (3) ◽

pp. 304-309 ◽

Cited By ~ 15

Author(s):

Jacinta M. Kimiti ◽

David W. Odee

Keyword(s):

Soil Fertility ◽

Soil Fertility Management ◽

Integrated Soil Fertility Management ◽

Fertility Management ◽

Cowpea Rhizobia ◽

Semi Arid

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Climate Variability, Climate Change and Social Vulnerability in the Semi-arid Tropics

10.1017/cbo9780511608308 ◽

1996 ◽

Cited By ~ 42

Keyword(s):

Climate Change ◽

Climate Variability ◽

Social Vulnerability ◽

Semi Arid

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Ferrihydrite dissolution at the root zone of crops under semi-arid condition controls the plant uptake of uranium and arsenic

10.1021/scimeetings.0c03694 ◽

2020 ◽

Author(s):

Arindam Malakar ◽

Michael Kaiser ◽

Daniel D. Snow ◽

Harkamal Walia ◽

Chittaranjan Ray

Keyword(s):

Plant Uptake ◽

Root Zone ◽

Arid Condition ◽

Semi Arid

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Life strategies in a semi-arid grassland community — mechanisms of dispersal and reproduction within Lapiedro martinezii-Stipetum tenacissimae (Southeastern Spain)

Feddes Repertorium ◽

10.1002/fedr.4921100310 ◽

1999 ◽

Vol 110 (3-4) ◽

pp. 265-285 ◽

Cited By ~ 1

Author(s):

I. Hensen

Keyword(s):

Life Strategies ◽

Grassland Community ◽

Southeastern Spain ◽

Semi Arid

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THE CLASSIFICATION OF LAND ACCORDING TO THE DEGREE OF RABBIT INFESTATION IN CENTRAL OTAGO

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.1987.48.1792 ◽

1987 ◽

pp. 65-70

Author(s):

I.G.C. Kerr ◽

J.M. Williams ◽

W.D. Ross ◽

J.M. Pollard

Keyword(s):

Carrying Capacity ◽

Mediterranean Climate ◽

Natural Habitat ◽

Public Funding ◽

Soil Survey ◽

European Rabbit ◽

Cultural Modification ◽

Classification Information ◽

Semi Arid

The European rabbit (Oryctolagus cuniculus) introduced into New Zealand in the 183Os, has consistently flourished in Central Otago, the upper Waitaki, and inland Marlborough, all areas of mediterranean climate. It has proved difficult to manage in these habitats. The 'rabbit problem' is largely confined to 105,000 ha of low producing land mostly in semi arid areas of Central Otago. No field scale modifications of the natural habitat have been successful in limiting rabbit numbers. The costs of control exceed the revenue from the land and continued public funding for control operations appears necessary. A system for classifying land according to the degree of rabbit proneness is described. Soil survey and land classification information for Central Otago is related to the distribution and density of rabbits. This intormation can be used as a basis for defining rabbit carrying capacity and consequent land use constraints and management needs. It is concluded that the natural rabbit carrying capacity of land can be defined by reference to soil survey information and cultural modification to the natural vegetation. Classification of land according to rabbit proneness is proposed as a means of identifying the need for, and allocation of, public funding tor rabbit management. Keywords: Rabbit habitat, rabbit proneness, use of rabbit prone land.

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