检索结果-南通市图书馆

Root Growth, Nutrition and Yield of Maize with Applied Different Limestone Particle Size in the Cerrado Soil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2014年第4期5卷 463-472页

作者： Rafael Felippe Ratke Hamilton Seron Pereira Joao de Deus Gomes dos Santos Junior Joaquim JoséFrazao Juliano Magalhaes Barbosa Bruno de Oliveira Dias Departamento de Engenharias AgronomiaCampus Professora Cinobelina ElvasUniversidade Federal do PiauíBom JesusBrazil Instituto de Ciencias Agrárias Universidade Federal de UberlandiaUberlandiaBrazil embrapa Centro Nacional de Pesquisa no CerradoPlanaltinaBrazil Programa de Pós-Graduacao em Agronomia Universidade Federal de GoiásGoianiaBrazil

The limestone with smaller particle size provides rapid correction of soil acidity. However, the limestone with large particles can promote bigger root growth, and may still have a residual effect on the soil. The aim of this study was to evaluate the residual effect of the application and incorporation of different limestone with a particle size bigger than 0.30 mm in root growth, nutrition and yield of maize in Cerrado soil. A randomized completed block utilized in this experiment, with five treatments and four replications. The grain sizes of dolomitic limestone incorporated into the Oxisol were: 0 (control, no-lime), 2.00-0.82 mm, 0.82-0.56 mm, 0.56-0.30 mm, 0.30-0.20 mm, in doses of 6.5 t·ha-1, 3.9 t·ha-1, 2.6 t·ha-1 and 1.3 t·ha-1 respectively. The limestone applied in introduction no-tillage. The maize were evaluated of root attributes, nutrition and grain yield in two years 2009 and 2010. The use of limestone particle size of 2.00-0.82 mm, and the quantity of 6.5 t·ha-1 applied to the soil and incorporated showed elongation and root growth of maize thin depth of 20-40 cm in the soil. In that, same proposed management of the limestone was the highest maize grain yield in the first year. The rooting characteristics evaluated correlated with leaf Ca and Cu and maizegrain yield.

关键词： Limestone No-Tillage Zea Mays

Root Growth, Nutrition and Yield of Maize with Applied Finely Limestone in Surface of Cerrado Soil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2014年第6期5卷 834-844页

作者： Rafael Felippe Ratke Hamilton Seron Pereira Joao de Deus Gomes dos Santos Junior Joaquim JoséFrazao Juliano Magalhaes Barbosa Bruno de Oliveira Dias Departamento de Engenharias AgronomiaCampus Professora Cinobelina ElvasUniversidade Federal do PiauíBom JesusBrazil Instituto de Ciencias Agrárias Universidade Federal de UberlandiaUberlândiaBrazil embrapa Centro Nacional de Pesquisa no CerradoPlanaltinaBrazil Programa de Pós-graduacao em Agronomia Universidade Federal de GoiásGoianiaBrazil

The surface applies lime to correcting soil acidity in no-tillage and promotes root development and yield of maize. However, limestone with a particle size smaller than 0.30 mm cannot promote this effect. The aim of this study was to determine the root attributes, nutrition and productivity of maize with limestone ground in no-tillage. The experimental design was randomized blocks with five treatments and four replications. The treatments consisted of different particle sizes of limestone applying superficially to the soil under NT 0) control, without lime, 1) 0.30 mm to 0.20 mm 2) 0.20 mm to 0.10 mm, 3) 0, 10 mm to 0.05 mm 4) 0.05 mm to 0.01 mm. Attributes root, leaf nutrition and grain yield of maize were evaluated in two years 2009 and 2010. The elongation of roots in a 20-40 cm depth was greater when using limestone with particle size between 0.30 mm and 0.20 mm. The root length of maize plants correlated with the levels of Mn in maize leaves. The root development promoted by liming effect was not reflected in the productivity of maize.

关键词： Particle Size No-Tillage Limestone

Actual Evapotranspiration Estimation Using Remote Sensing: Comparison of SEBAL and SSEB Approaches

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Remote Sensing 2015年第3期4卷 234-247页

作者： Bergson G. Bezerra Bernardo B. da Silva Carlos A. C. dos Santos José R. C. Bezerra Program of Post-Graduate in Climatic Sciences Federal University of Rio Grande do Norte (PPGCC/UFRN)Natal Brazil Department of Geographical Sciences Federal University of Pernambuco Recife Brazil Department of Atmospheric Science Federal University of Campina Grande Campina Grande Brazil Brazilian Agricultural Research Company/National Centre of Cotton Research (embrapa/Algodão) Campina Grande Brazil

The main objective of this paper was to evaluate the daily actual evapotranspiration (ET) accuracy obtained by remote sensing algorithms when compared with Bowen ratio measurements performed in the cotton fields. The experiment was conducted in a cotton experimental field of embrapa located in Ceará State, Brazil. Seven TM Landsat-5 images acquired in 2005 and 2008 were used to perform SEBAL and SSEB algorithms. The comparison between the estimated values by remoting sensing algorithms and the measured values in situ showed an acceptable accuracy. Besides, SSEB algorithm showed to be an important tool for ET analysis in the semi-arid regions, due to the fact that it does not need the meteorological data to solve the energy balance, but only the average temperature of the “hot” and “cold” pixels. Additionally, SSEB presents simpler processing than SEBAL algorithm that needs to solve an iterative process to obtain the sensible heat flux values.

关键词： Energy Balance Landsat Evapotranspiration Bowen Ratio Semi-Arid

Tolerance to Salinity of Sesame Genotypes in Different Phenological Stages

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2017年第8期8卷 1904-1920页

作者： Janivan Fernandes Suassuna Pedro Dantas Fernandes Marcos Eric Barbosa Brito Nair Helena Castro Arriel Alberto Soares de Melo Josely Dantas Fernandes Department of Biology State University of Paraiba UEPB Campina Grande Brazil Department of Agricultural Engineering Federal University of Campina Grande UFCG Campina Grande Brazil Department of Agricultural Science Federal University of Campina Grande UFCG Pombal Brazil embrapa-Brazilian Agricultural Research Corporation Campina Grande Brazil Department of Agrobiology and Agriculture State University of Paraiba UEPB Lagoa Seca Brazil

The sesame crop is usually avoided in salt-affected areas because of the various effects of saline stress on plants. Besides varying between species, salinity effects are known to vary for genotypes of the same species as well as plant development stages. Thus, through the irrigation of plants with saline water, this study evaluates tolerance to saline stress of new sesame genotypes in different phenological stages. Three experiments were carried out under greenhouse conditions, using the sesame genotypes BRS Seda, LAG-927561 and LAG-26514. Water with different levels of electrical conductivity (ECw = 0.6, 1.6, 2.6, 3.6 and 4.6 dS m-1) was used to irrigate plants during germination and initial growth stages, as well as the entire crop cycle. Tolerance to saline stress (3.6 dS m-1) during growth and production stages was also studied. Salinity did not affect sesame germination, but seedling growth was hindered from the ECw of 1.6 dS m-1 onwards, and plant height was the most affected growth variable. Seed production is affected by salinity, regardless of the phenological stage in which plants are exposed to salinity. The strains LAG-927561 and LAG-26514 show promising signs in studies on adaptation to saline stress.

关键词： Sesamum indicum Development Stages Saline Stress Relative Crop Yield

Age and Calcium Sources in Laying Hen Feed Affect Calcium Digestibility

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Animal Sciences 2021年第3期11卷 501-513页

作者： Thiago Ferreira Diana Arele Arlindo Calderano Fernando de Castro Tavernari Horácio Santiago Rostagno Alexandre de Oliveira Teixeira Luiz Fernando Teixeira Albino Department of Animal Sciences Universidade Federal de Vi&#231osa Vi&#231osa MG Brazil embrapa Suínos e aves Concórdia SC Brazil Department of Animal Sciences Universidade Federal de S&#227o Jo&#227o del-Rei S&#227o Jo&#227o del-Rei MG Brazil

The apparent calcium (Ca) digestibility coefficient (ADC) and true digestibility coefficient (TDC) of different inorganic calcium sources were determined in laying hens of different ages. Three Ca digestibility tests were carried out, each assessing 240 Lohmann Brown lineage laying hens distributed in a completely randomized design. Nine dietary treatments were arranged in a 3 × 3 factorial design consisting of three ages (40, 50 and 70 weeks) × three Ca (dicalcium phosphate (DCP) sources, fine (FL) and coarse (CL)) limestone, comprising eight replicates per treatment of six birds per experimental unit. Regarding the DCP, the ADC was higher (P as 0.889, 0.613 and 0.712, respectively. No effect (P > 0.05) of age on the ADC was noted for either FL or CL. Comparing Ca sources, DCP exhibited a higher (P 0.05). Endogenous loss values of 790, 860 and 930 mg·kg

关键词： Dicalcium Phosphate Digestion Endogenous Calcium Granulometry Limestone

Use of the Nitrogen Index to assess nitrate leaching and water drainage from plastic-mulched horticultural cropping systems of Florida

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2016年第4期4卷 237-244页

作者： Edilene C.S.Marchi Lincoln Zotarelli Jorge A.Delgado Diane L.Rowland Giuliano Marchi Instituto Federal de Educacao Ciencia e Tecnologia de BrasiliaCampus PlanaltinaDFRodovia DF-128-21-Zona Rural de PlanaltinaBrasilia-DF 73380-900Brazil University of Florida-Horticultural Science Department 1241 Fifield HallGainesvilleFL 32611USA USDA-ARS Soil Management and Sugar Beet Research Unit2150 Centre Ave.Building DSuite 100Fort CollinsCO 80526USA Agronomy Department University of FloridaGainesvilleFLUSA embrapa Cerrados Rod.BR 020km 18CP 08223CEP73310-970 Planaltina DFBrazil

Water quality in Florida is significantly impacted by nitrate(NO_(3)-N)leaching losses from agriculture in a large part of the *** crops are planted across large areas of Florida on coarse sandy soils with low soil water retention and soil organic matter,increasing the potential for NO_(3)-N *** leaching losses from the root zone of vegetable cropping systems can negatively impact *** tools such as the Nitrogen Index(N-Index)are able to quickly assess N use efficiency and losses via NO_(3)-N leaching from agricultural ***,the N-Index provides technical information about N losses pathways tied to agricultural management practices with a great level of confidence;this information has been used by researchers,growers and policymakers as a decision support ***,the current version of the NIndex that has been used for different field crops has not been calibrated to be used in plastic-mulched horticultural cropping *** aim of this work was to calibrate and validate the N-Index for plasticmulched horticultural cropping systems of *** study found that the N-Index tool accurately identified and ranked the risk of N losses in the evaluated horticultural *** N-Index was calibrated for Florida's plastic-mulched horticultural cropping systems using a sensitivity *** adjusted N-Index was validated using compiled data of vegetables grown under plastic mulching systems during three consecutive *** from these studies suggest that the N-Index can be an easy-to-use tool capable of assessing nitrogen management practices for vegetable *** tool can be used to guide nutrient managers in the implementation of best nitrogen management practices that could contribute to reduced NO_(3)-N leaching losses from vegetable systems in Florida,contributing to a smaller environmental footprint and conservation of water quality.

关键词： Florida,nitrogen management Nitrate leaching Water leaching,vegetables,plastic mulch

Nitrapyrin effectiveness in reducing nitrous oxide emissions decreases at low doses of urea in an Andosol

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2021年第2期31卷 303-313页

作者： Mayela MONGE-MUÑOZ Segundo URQUIAGA Christoph MÜLLER Juan Carlos CAMBRONEROHEINRICHS Mohammad ZAMAN Cristina CHINCHILLA-SOTO Azam BORZOUEI Khadim DAWAR Carlos E.RODRÍGUEZ-RODRÍGUEZ Ana Gabriela PÉREZ-CASTILLO Environmental Pollution Research Center(CICA) University of Costa RicaMontes de Oca 11501(Costa Rica) embrapa Agrobiology Rod.BR 465km 7SeropédicaRJCEP 23891-000(Brazil) Institute of Plant Ecology Justus Liebig University GiessenHeinrich-Buff Ring 26Giessen 35392(Germany) School of Biology and Environmental Science University College DublinBelfieldDublin 4(Ireland) Soil and Water Management&Crop Nutrition Section Joint FAO/IAEA Division of Nuclear Techniques in Food and AgricultureDepartment of Nuclear Sciences and ApplicationsInternational Atomic Energy AgencyVienna International CentreVienna 1400(Austria) Nuclear Agriculture Research School Nuclear Science and Technology Research Institute(NSTRI)Karaj ***(Iran) Department of Soil and Environmental Sciences University of AgriculturePeshawar 25000(Pakistan)

In the tropics,frequent nitrogen(N)fertilization of grazing areas can potentially increase nitrous oxide(N_(2)O)*** application of nitrification inhibitors has been reported as an effective management practice for potentially reducing N loss from the soil-plant system and improving N use efficiency(NUE).The aim of this study was to determine the effect of the co-application of nitrapyrin(a nitrification inhibitor,NI)and urea in a tropical Andosol on the behavior of N and the emissions of N_(2)O from autotrophic and heterotrophic nitrification.A greenhouse experiment was performed using a soil(pH 5.9,organic matter content 78 g kg^(-1),and N 5.6 g kg^(-1))sown with Cynodon nlemfuensis at 60%water-filled pore space to quantify total N_(2)O emissions,N_(2)O derived from fertilizer,soil ammonium(NH_(4)^(+))and nitrate(NO_(3)^(-)),and *** study included treatments that received deionized water only(control,NI).No significant differences were observed in soil NH_(4)^(+)content between the UR and UR+NI treatments,probably because of soil mineralization and NO_(3)^(-)produced by heterotrophic nitrification,which is not effectively inhibited by *** 56 d,N_(2)O emissions in UR(0.51±0.12 mg N_(2)O-N concluded that the soil organic N mineralization and heterotrophic nitrification are the main processes of NH_(4)^(+)and NO_(3)^(-)***,it was found that N_(2)O emissions were partially a consequence of the direct oxidation of the soil's organic N via heterotrophic nitrification coupled to ***,the results suggest that nitrapyrin would likely exert significant mitigation on N_(2)O emissions only if a substantial N surplus exists in soils with high organic matter content.

关键词： autotrophic nitrification heterotrophic nitrification mineral N ^(15)N tracer nitrification inhibitor tropical grass

Copper Phytoextraction and Phytostabilization by <i>Brachiaria decumbens</i>Stapf. in Vineyard Soils and a Copper Mining Waste

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Soil Science 2013年第6期3卷 273-282页

作者： Robson Andreazza Leandro Bortolon Simone Pieniz Flávio A. O. Camargo Elisandra Solange Oliveira Bortolon Department of Soil Federal University of Rio Grande do Sul Laboratory of Soil Microbiology Porto Alegre Brazil Department of Soil Federal University of Rio Grande do Sul Laboratory of Soil Microbiology Porto Alegre Brazil Department of Technology and Food Microbiology Federal University of Rio Grande do Sul RS Porto Alegre Brazil. embrapa-National Research Center of Fisheries Aquaculture and Agricultural Systems Palmas Brazil

Brachiaria decumbens is a high biomass plant with great potential for phytoremediation of copper-polluted soils. The current study aimed to evaluate B. decumbens plants for phytoextraction and phytostabilization use in two different copper contaminated vineyard soils and a copper mining waste. Also, the macro and micronutrients uptake were evaluated after plants growth in copper contaminated soils. B. decumbens was cultivated in two vineyard soils (Inceptisol and Mollisol) and a copper mining waste for 47 days of growth in greenhouse. Then, B. decumbens’s nutrient uptake was evaluated, and it’s potential application in phytoremediation techniques for the phytoextraction and phytostabilization of copper contamination. B. decumbens exhibited high levels of biomass production at contaminated soils and no negative effect on macronutrients uptake was found. Copper contaminated soils affected micronutrients uptake by Brachiaria plants. This Brachiaria specie showed high potential on copper phytoextraction with accumulation of copper concentrations in the shoots and roots of 70 and 585 mg·kg-1 of dry mass, respectively, in the vineyard Inceptisol soil, after 47 days of growth. Mollisol soil and copper mining waste also exhibited high copper concentration in the biomass in the entire plant with 371 and 466 mg·kg-1, respectively. Although Brachiaria exhibited low levels of translocation factor for copper, this specie showed high potential for copper phytoextraction on Inceptisol, Mollisol and copper mining waste with 1900, 1156 and 1363 g·ha-1 of copper, respectively. In summary, B. decumbens plants showed high potential for copper phytoextraction and phytostabilization of copper on contaminated vineyard soils and copper mining

关键词： Soil Pollution Soil Remediation Nutrient Uptake Bioremediation

Bacterial Community Associated with Autotrophic and Heterotrophic Cultures of Medicinal Plant Smallanthus sonchifolius (Yacon)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2012年第10期3卷 1382-1389页

作者： Rita M. Moraes Itamar S. Melo Joko Sumyanto Suman Chandra Vaishali Joshi 1National Center for Natural Products Research Research Institute for Pharmaceutical Sciences The University of Mississippi University Oxford USA Center of Water and Wetland Resources The University of Mississippi Field Station Abbeville USA embrapa/Environment Rodovia SP 340 - Km 127.5 Caixa Postal 69 CEP Jaguariúna SP Brazil National Center for Natural Products Research Research Institute for Pharmaceutical Sciences The University of Mississippi University Oxford USA

Several unfruitful attempts to grow axenic shoot cultures of Smallanthus sonchifolius, also known as yacon, were made before healthy shoots grew in association with bacteria on half strength Murashigue and Skoog media supplemented with 2.2 μM benzylaminopurine. Twenty-one bacterial isolates were obtained from in vitro S. sonchifolius plantlets, eight of these isolates were identified as Flavimonas oryzihabitans, Curtobacterium pusillum, Sphingomonas paucimobilis, and Microbacterium imperiale. These microorganisms produced indole acetic acid (IAA) at amounts varying between 8.89 to 47.45 μg/mL, reason for being classified as plant growth promoting bacteria (PGPB). The results show that buds associated with bacteria cultured on sucrose free media produced 3.77 new roots measuring 18.33 cm in length after a 30-day growing period. In contrast, buds growing on sucrose supplemented media, the number of roots induced was higher (6.67 to 14 roots/explant) but shorter in length, 4.67 to 5.83 cm. During plant acclimatization to soil, photosynthesis and water efficiency were measured showing that the plants were healthy and vigorous. A slightly higher rate of photosynthesis and water use efficiency was recorded in the plants produced on heterotrophic conditions as compared to plants grown in sucrose free media. Plants adapted well in the soil demonstrating that the PGPB community associated to S. sonchifolius in shoot cultures was not harmful to plant production. The purpose of this study was to demonstrate that the bacteria associated with in vitro S. sonchifolius shoot cultures was not the result of microbial contamination, but rather from symbiotic associations that extended from cultivation in the greenhouse, to culture and back to soil. This is the first report to show that autotrophic cultures may represent a viable alternative to grow healthy plants without eliminating beneficial bacteria associated with the host.

关键词： Micropropagation Endophytes Yacon IAA Bacteria