Consulta: subjectFacets:"Deficit irrigation"
Registros recuperados: 12
Data/hora: 02/06/2024 06:30:36

DIFFERENT SOYBEAN PLANT POPULATIONS UNDER CENTRAL PIVOT IRRIGATION
Provedor de dados: 70
Autores: Gava,Ricardo; Anselmo,Jefferson L.; Neale,Christopher M. U.; Frizzone,José A.; Leal,Aguinaldo J. F.
ABSTRACT Planting density can influence the competitiveness among plants mainly by water, nutrients and solar radiation, directly affecting yield. The purpose of this study was to evaluate the productivity of different soybean cultivars at different planting populations under irrigated and rainfed conditions. The experiment was conducted during the 2014/15 growing season, under center pivot irrigation in Chapadão do Sul – MS, Brazil. The experimental design was randomized complete block design with split-plot, as follows: Irrigated and Rainfed (plots) x Six cultivars (subplots) x Three Plant Populations (sub-subplots) with 4 replications. The irrigation management was realized by Penman-Monteith-FAO method. The cultivars used were: NA 5909 RR, DM 5958...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant density; Irrigated Soybean; Deficit irrigation; Soybean Yield.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300441

Cultivo da videira.
Provedor de dados: 14
A produção de uvas vem ganhando, cada vez mais, destaque na economia do Brasil. No Semiárido, o cultivo de uvas de mesa atinge uma área de aproximadamente 12.100 hectares, cuja produtividade ocupa uma parcela significativa o mercado, inclusive nas exportações. Este trabalho reúne informações técnicas acerca da produção de uva de mesa nas condições do Semiárido do Brasil sob regime irrigado. São apresentados aspectos que vão desde a implantação do vinhedo, manejo da poda, raleio, adubação, aplicação de fertilizantes à comercialização; enfim, toda a cadeia produtiva. A publicação representa o esforço da Embrapa Semiárido para atualizar as informações do Sistema de Produção: cultivo da videira, publicado em 2004, uma necessidade frente à rapidez na produção...
Tipo: Livros
Palavras-chave: Manejo da parte aérea; Manejo de cacho; Uva; Sistema de Produção; Manejo do Solo; Fertirrigação; Irrigação; Variedade; Comportamento de Variedade; Sistema de Cultivo; Sistema Radicular; Grapes; Cultivation area; Irrigation; Deficit irrigation; Cultivars; Wine cultivars.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/884525

Efeito da irrigação com déficit sustentado e secagem parcial do sistema radicular em coqueiro-anão.
Provedor de dados: 14
Autores: MOREIRA, C. G.; SILVA, J. B. DA; MIRANDA, F. R. de; BEZERRA, M. A.; CABRAL, J. E. de O.; ROCHA, A. B. DA. S.; GUIMARÃES, V. B.
O estudo objetivou determinar a produtividade, os custos, as receitas e a produtividade da água de irrigação (PAI) do coqueiro-anão irrigado por gotejamento e microaspersão, sob diferentes níveis de irrigação deficitária e secagem parcial do sistema radicular (PRD).
Tipo: Folhetos
Palavras-chave: Irrigação deficitária; Produtividade da água de irrigação; Irrigation water productivity; Cocos Nucifera; Água de Irrigação; Produtividade; Deficit irrigation; Cocos (Arecaceae).
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1145483

EFFECTS OF SALINE WATER ON TOMATO UNDER SUBSURFACE DRIP IRRIGATION: NUTRITIONAL AND FOLIAR ASPECTS
Provedor de dados: 126
Autores: Kahlaoui,B; Hachicha,M; Rejeb,S; Rejeb,M.N; Hanchi,B; Misle,E.
A field experiment on the effects of drip irrigation (DI) and subsurface drip irrigation (SDI) with saline water (6.57 dS m-1) on three tomato cultivars (Lycopersicon esculentum Mill., cvs. Rio Tinto, Rio Grande and Nemador) was carried out with the purpose to quantify physiological responses. The aim was to improve irrigation water management under saline conditions of Tunisia. The trial was established in a silt-clayey soil with three regimes of irrigation: 100 %, 85 % and 70 % of crop water requirement. Results evidenced a significant difference between the two irrigation systems for the three cultivars. Growth parameters such as leaf area, chlorophyll content and mineral composition of leaves, petioles, stems and roots were affected significantly by...
Tipo: Journal article
Palavras-chave: Salt tolerance; Tomato; Localized irrigation; Deficit irrigation; Tunisia.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100007

Introducing deficit irrigation crop techniques derived by crop growth models into a Positive Mathematical Programming model
Provedor de dados: 31
Autores: Severini,   Simone; Cortignani,   Raffaele.
There is a growing policy pressure to reduce water use in agriculture when this generates sufficiently large environmental benefits and increases the well-being of other water users. Several analysis investigate farmers’ response to water policy by means of mathematical programming models including Positive Mathematical Programming (PMP). The originals PMP methods refer only to activities observed in the reference period. However, under the pressure of new water policies, farmers can adjust not only their cropping patterns but also the irrigation techniques they use. In particular, they could introduce water deficit irrigation crop techniques that were not profitable in past conditions. This paper proposes an extension of the Röhm and Dabbert approach...
Tipo: Conference Paper or Presentation
Palavras-chave: Positive mathematical programming; Water policies; Deficit irrigation; Crop Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/44010

Water productivity for sugar and biomass of sugarcane varieties
Provedor de dados: 91
Autores: Leal,Daniel P. V.; Coelho,Rubens D.; Barbosa,Fernando da S.; Fraga Júnior,Eusimio F.; Mauri,Robson; Santos,Lucas da C.
ABSTRACT The aim of this study was to evaluate the water productivity into biomass and into sugar for 23 sugarcane varieties (second ratoon crop) under two levels of drip irrigation. Two experiments were conducted in a greenhouse. Experiment 1 comprised nine sugarcane varieties grown in a clay soil and Experiment 2 was composed of 14 varieties in a sandy-loam soil. Moreover, two irrigation treatments were adopted: T100 - full irrigation with 100% crop evapotranspiration replacement, maintaining soil moisture near field capacity for each variety; and T70 - irrigation with 70% T100 water depth. Water productivity was evaluated in terms of stem fresh biomass (WPFB) and sugar (WPGSY). The results showed that WPFB ranged from 11.45 to 18.45 kg m-3. The highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deficit irrigation; Second ratoon; Evapotranspiration.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000900618

Yield, quality and drought sensitivity of tomato to water deficit during different growth stages
Provedor de dados: 63
Autores: Cui,Jintao; Shao,Guangcheng; Lu,Jia; Keabetswe,Larona; Hoogenboom,Gerrit.
ABSTRACT In areas where the supply of water for irrigation is limited, tomato production is often subject to drought stress. In order to investigate the drought sensitivity of tomato (Lycopersicon esculentum Mill.) yield and quality during different growth stages, field and pot experiments were conducted in a high tunnel in southern China during the 2013 and 2016 growing seasons. The experiments consisted of four treatments. Crops were drip-irrigated to 100 % of field capacity at all growth stages divided into treatment T1 (control) and the treatment group T2, T3 and T4 receiving half the amount of irrigation as T1 when the soil water content reached 70 % of field capacity, the vegetative phase (stage I) T2, the flowering and fruit development phase (stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deficit irrigation; Sensitivity index; Irrigation management; High tunnel.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000200601

Water relations of field-grown grapevines in the São Francisco Valley, Brazil, under different rootstocks and irrigation strategies
Provedor de dados: 63
Autores: Souza,Claudia Rita de; Bassoi,Luís Henrique; Lima Filho,José Moacir Pinheiro; Silva,Fabrício Francisco Santos da; Viana,Leandro Hespanhol; Dantas,Barbara França; Pereira,Maiane Santos; Ribeiro,Paula Rose de Almeida.
There is an increased demand for high quality winegrapes in the São Francisco Valley, a new wine producing area in Brazil. As the grape quality is closely linked to the soil water status, understanding the effects of rootstock and irrigation management on grapevine water relations is essential to optimize yield and quality. This study was carried out to investigate the effects of irrigation strategies and rootstocks on water relations and scion vigour of field-grown grapevines in Petrolina, Pernambuco state, Brazil. The cultivars used as scions are Moscato Canelli and Syrah, both grafted onto IAC 572 and 1103 Paulsen rootstocks. The following water treatments were used: deficit irrigation, with holding water after veraison; and partial root-zone drying,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Partial rootzone drying; Deficit irrigation; Stomatal conductance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400002

Growth of black pepper plantlets under different substrates and irrigation levels
Provedor de dados: 63
Autores: Cruz,Eleandro Silva da; Medici,Leonardo Oliveira; Leles,Paulo Sérgio dos Santos; Ambrozim,Clodoaldo Spadeto; Souza,Wendell Luccas; Carvalho,Daniel Fonseca de.
ABSTRACT Optimization of the use of water and the possibility of using residues as substrate in the black pepper production chain can yield economic and environmental benefits. The objective of this study was to evaluate the biometric and physiological traits of black pepper plantlets (Piper nigrum L.), cv. Bragantina, at different irrigation levels and soilless substrates. Plantlets were grown for 120 days on three substrates [biosolid + crushed coconut fiber (3:1, by volume); biosolid + granitic rock powder (3:1, by volume); and biosolid + crushed coconut fiber + granitic rock powder (2:1:1, by volume)] and at five irrigation levels [36 % (very low); 55 % (low); 85 % (moderate); 100 % (well-irrigated); and 126 % of the reference irrigation level...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper nigrum L; Deficit irrigation; Potting mix; Biosolid; Granitic rock powder.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100601

Production of drip irrigated squash (Cucurbita Pepo, L.) under different levels of irrigation and uniformity
Provedor de dados: 111
Autores: Elnemr, Moataz Kamal; Elmetwalli, Adel Helal.
This study aimed to get the most possible benefit of using deficit irrigation to maximize water productivity of squash, besides investigating the ability of drip irrigation uniformity to reduce the effect of deficit irrigation on squash crop production (Cucurbita pepo - Hybrid Revera). Three levels of irrigation uniformity levels (UL) based on the value of uniformity coefficient (UC) namely excellent (E), very good (VG), and unacceptable (UA) were examined with three irrigation levels based on crop evapotranspiration (ETc) which were full irrigation (FI or 100% ETc) to be compared to two defecit irrigation levels 90% ETc (DI90), and 80% ETc (DI80). Results showed that both UL and DI had significant effect on squash production. There was significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deficit irrigation; Drip irrigation; Levels; Production; Squash; Uniformity.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6277

Calibrating and validating AquaCrop model for maize crop in Northern zone of Nigeria
Provedor de dados: 111
Autores: Ezekiel, Oiganji; Igbadun, H. E.; Mudiare, O.J.; Oyebode, M.A.
Farmers in the northern Guinea Savannah ecological zone of Nigeria have been experiencing declining crop yield due to erratic water supply. In recent times, research on better water management and interaction between effects of climate, soil and field management on crop production is fast gaining grounds with the use of models. Models can be used to predict the impact of long-term climate variability, thus providing an opportunity of better techniques compared with the traditional multi-location trials. This study presents the calibration and validation of AquaCrop model for drip irrigated maize (Zea mays). Calibration was done using data of 2013, while validation across seasons was done with data of 2014. The modelling efficiency of grain yield, biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural Engineering/ soil and water conservation engineering growth stage; Deficit irrigation; Drip irrigation; Water management; Modelling.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3755

Irrigation Water Management in Latin America
Provedor de dados: 117
Autores: de Oliveira,Aureo S; Trezza,Ricardo; Holzapfel,Eduardo; Lorite,Ignacio; Paz,Vital Pedro S.
Latin American countries show a great potential for expanding their irrigated areas. Irrigation is important for strengthening local and regional economy and for enhancing food security. The present paper aimed at providing a brief review on key aspects of irrigation management in Latin America. Poor irrigation management can have great impact on crop production and on environment while good management reduces the waste of soil and water and help farmers maximizing their profits. It was found that additional research is needed to allow a better understanding of crop water requirements under Latin American conditions as well as to provide farmers with local derived information for irrigation scheduling. The advantages of deficit irrigation practices and the...
Tipo: Journal article
Palavras-chave: Irrigation; Evapotranspiration; Deficit irrigation; Remote sensing.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000500002