• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Manejo da irriga??o com d?ficit h?drico controlado no cultivo org?nico da cenoura (Daucus carota) / Irrigation management with water deficit controlled in organic cultivation of carrot (Daucus carota).

Concei??o, Bruno C?sar L?llis 29 July 2015 (has links)
Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-03-31T11:38:34Z No. of bitstreams: 1 2015 - Bruno C?sar L?llis Concei??o.pdf: 1515220 bytes, checksum: a05f88b94d301561f77c60c2076ef313 (MD5) / Made available in DSpace on 2017-03-31T11:38:34Z (GMT). No. of bitstreams: 1 2015 - Bruno C?sar L?llis Concei??o.pdf: 1515220 bytes, checksum: a05f88b94d301561f77c60c2076ef313 (MD5) Previous issue date: 2015-07-29 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / The crop simulation models are tools used to assist in the management of the available resources. For the carrot crop, few studies have examined the effect of irrigation with deficits in their performance and quality of crops. The optimization of the regulated deficit irrigation strategy (ORDI), which integrates the economic optimization model for irrigation water management (MOPECO), determines the level of deficit to be achieved at each stage of crop development in order to maximize the performance for a given level of deficit. The study was conducted in 2013 and 2014 in the Integrated Agroecological Production - SIPA, located in Serop?dica-RJ, Brazil. It was used drip irrigation system with a line for each two lines of cultivation, emitter spacing of 10 cm and flow rate of 4 L h-1 m-1. Two deficit irrigation application methods were evaluated (constant water deficit - CHD and ORDI). For both methods were applied 5 different levels of global deficit (90, 80, 70 and 60% of crop evapotranspiration (ETm), and without irrigation), besides the treatment with 100% ETm. In the two years evaluated no statistically significant differences were obtained in total yields between ORDI and CHD, for the same level of deficit used. However, a high percentage of the roots obtained from the CHD strategy had shortcomings in terms of quality (defects, improper size, cracks, etc.) provided decrease in commercial production. Therefore, for the same volume of water applied, irrigation management made by ORDI was more efficient, reaching 50% and 24% more commercial productivity in the treatment ETm 0.6 and other treatments, respectively / Os modelos de simula??o de cultivos s?o ferramentas utilizadas para auxiliar no gerenciamento dos recursos dispon?veis. Para o cultivo de cenoura, poucos estudos examinaram o efeito da irriga??o com d?ficit em seu desempenho e qualidade das colheitas. O d?ficit otimizado por etapas (DOTI), metodologia integrada ao Modelo de otimiza??o econ?mica da ?gua de irriga??o (MOPECO), determina o n?vel de d?ficit a ser atingido em cada fase do desenvolvimento da cultura visando maximizar seu desempenho, para um determinado n?vel de d?ficit a ser obtido no ciclo. O estudo foi conduzido em 2013 e 2014, no Sistema Integrado de Produ??o Agroecol?gica - SIPA, localizada em Serop?dica-RJ, Brasil. O sistema de irriga??o usado foi de gotejamento, com uma fita gotejadora para cada duas linhas de cultivo, espa?amento entre emissores de 10 cm e vaz?o de 4 L h-1 m-1. Dois m?todos de aplica??o de irriga??o com d?ficit foram avaliados, sendo denominados d?ficit h?drico constante (DHC) e DOTI. Para ambos os m?todos foram aplicados 5 diferentes n?veis de d?ficit global (90, 80, 70 e 60% do potencial de evapotranspira??o da cultura (ETm), e sem irriga??o), al?m do tratamento com 100% da ETm. Os resultados demonstram que nos dois anos de ensaios de campo n?o foram obtidas diferen?as estatisticamente significativas dos rendimentos totais entre DOTI e DHC, para o mesmo n?vel de d?ficit h?drico utilizado. No entanto, uma alta porcentagem das ra?zes obtidas com a estrat?gia DHC apresentaram defici?ncias em termos de qualidade (defeitos, tamanhos inadequados, rachaduras, etc.) que proporcionaram diminui??o na produ??o comercial. Por conseguinte, para o mesmo volume de ?gua aplicado, o manejo da irriga??o efetuado pelo DOTI foi mais eficiente, atingindo 50% a mais de produtividade comercial no tratamento 0,6 ETm e cerca de 24% para os demais tratamentos

Page generated in 0.0906 seconds