scholarly journals EFICIÊNCIA DO USO DA ÁGUA NA IRRIGAÇÃO DO COQUEIRO ANÃO

Irriga ◽  
2019 ◽  
Vol 24 (1) ◽  
pp. 109-124
Author(s):  
Fabio Rodrigues de Miranda ◽  
ABEL BRUNO SILVA ROCHA ◽  
VICTOR BEVILAQUA GUIMARÃES ◽  
ELIZIO SAMPAIO DA SILVA ◽  
GILBERTO DE CASTRO MENDONÇA LIMA ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Irrigation Water ◽  
Cocos Nucifera ◽  
Coconut Water ◽  
Water Volume ◽  
Irrigation Water Use Efficiency ◽  
Irrigation Water Use ◽  
Use Efficiency ◽  
E Mail

EFICIÊNCIA DO USO DA ÁGUA NA IRRIGAÇÃO DO COQUEIRO ANÃO     FÁBIO RODRIGUES DE MIRANDA1; ABEL BRUNO SILVA ROCHA2; VICTOR BEVILAQUA GUIMARÃES2; ELIZIO SAMPAIO DA SILVA3; GILBERTO DE CASTRO MENDONÇA LIMA3 E MARIA MAYARA SOUSA SANTOS3   [1] Embrapa Agroindústria Tropical, R. Dra. Sara Mesquita, nº2270, Pici, CEP: 60511-110, Fortaleza, CE, Brasil. E-mail: [email protected] 2 Universidade Federal do Ceará, Av. Humberto Monte, s/n, Pici, CEP: 60440-593, Fortaleza, CE, Brasil.  E-mail: [email protected]; [email protected] 3 Ducoco Litoral S.A., Rodovia CE 085 s/n, Fazenda São Gabriel, zona rural,  CEP: 62590-000, Itarema - CE, CE, Brasil. E-mail: [email protected]; [email protected]; [email protected]     Resumo   O estudo objetivou determinar a eficiência de uso da água aplicada na irrigação (EUAIR) do coqueiro anão verde, em duas propriedades situadas nas principais regiões produtoras de coco verde do Ceará. Foram monitorados durante 24 meses a evapotranspiração da cultura (ETc), os volumes de água aplicados na irrigação, a produção de frutos e o volume de água dos frutos. A EUAIR foi determinada em termos das relações entre as produções de frutos e de água de coco (L) por planta e o volume de água aplicado na irrigação (m3 planta-1). Em ambos os locais, a estação seca estendeu-se de julho a dezembro e as necessidades de irrigação do coqueiro variaram de 30 a 39 m3 planta-1 ano-1. Na propriedade 1 o excesso de irrigação resultou em baixos valores de EUAIR, com média de 2,7 frutos e 1,2 L de água de coco por m3 de água aplicada. Na propriedade 2 foram aplicadas lâminas de irrigação abaixo da demanda hídrica da cultura, elevando os valores da EUAIR para 5,5 frutos e 2,0 L de água de coco por m3 de água aplicada na irrigação. No entanto, a irrigação deficitária causou uma redução expressiva no volume de água dos frutos ao longo da estação seca.   Palavras-chave: Cocos nucifera, manejo da irrigação, produtividade da água     MIRANDA, F. R.; ROCHA, A. B. S.; GUIMARÃES, V. B.; SILVA, E. S.; LIMA, G. C. M.; SANTOS, M. M. S. IRRIGATION WATER-USE EFFICIENCY OF DWARF COCONUT ORCHARDS     ABSTRACT   The study aimed to determine irrigation water-use efficiency (WUEIR) of dwarf coconut in two farms of the main coconut producing regions of the state of Ceará, Brazil. Crop evapotranspiration (ETc), irrigation water volumes, fruit yield and water volume per fruit were monitored for 24 months. WUEIR was calculated in terms of the relationships involving fruit yield (fruit plant-1) and coconut water yield (L plant-1) and irrigation water volume (m3 plant-1). At both farms, the irrigation season extended from July to December and coconut irrigation requirements ranged from 30 to 39 m3 plant-1 year-1. In farm 1, excess irrigation resulted in low WUEIR values, with an average of 2.7 fruits and 1.2 L of coconut water per m3 of water applied. In farm 2, irrigation depths were lower than crop water demand, resulting in higher values of WUEIR of 5.5 fruits and 2.0 L of coconut water per m3 of irrigation water. However, the deficit irrigation caused a significant reduction in the volume of water of the fruits along the dry season.   Keywords: Cocos nucifera, irrigation scheduling, water productivity

scholarly journals Effect of Deficit Irrigation and Reduced N Fertilization on Plant Growth, Root Morphology and Water Use Efficiency of Tomato Grown in Soilless Culture

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 228
Author(s):  
Ikram Ullah ◽  
Hanping Mao ◽  
Ghulam Rasool ◽  
Hongyan Gao ◽  
Qaiser Javed ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Irrigation Water ◽  
N Fertilization ◽  
Water Levels ◽  
Growth And Yield ◽  
Root Surface Area ◽  
Irrigation Water Use Efficiency ◽  
Irrigation Water Use ◽  
Use Efficiency

This study was conducted to investigate the effects of various irrigation water (W) and nitrogen (N) levels on growth, root-shoot morphology, yield, and irrigation water use efficiency of greenhouse tomatoes in spring–summer and fall–winter. The experiment consisted of three irrigation water levels (W: 100% of crop evapotranspiration (ETc), 80%, and 60% of full irrigation) and three N application levels (N: 100%, 75%, and 50% of the standard nitrogen concentration in Hoagland’s solution treatments equivalent to 15, 11.25, 7.5 mM). All the growth parameters of tomato significantly decreased (p < 0.05) with the decrease in the amount of irrigation and nitrogen application. Results depicted that a slight decrease in irrigation and an increase in N supply improved average root diameter, total root length, and root surface area, while the interaction was observed non-significant at average diameter of roots. Compared to the control, W80 N100 was statistically non-significant in photosynthesis and stomatal conductance. The W80 N100 resulted in a yield decrease of 2.90% and 8.75% but increased irrigation water use efficiency (IWUE) by 21.40% and 14.06%. Among interactions, the reduction in a single factor at W80 N100 and W100 N75 compensated the growth and yield. Hence, W80 N100 was found to be optimal regarding yield and IWUE, with 80% of irrigation water and 15 mM of N fertilization for soilless tomato production in greenhouses.

scholarly journals Optimization of irrigation water use efficiency evaluation indicators based on DPSIR-ISD model

2019 ◽  
Vol 20 (1) ◽  
pp. 83-94 ◽  
Author(s):  
Liu Dong ◽  
Zhou Lihui ◽  
Li Heng ◽  
Fu Qiang ◽  
Li Mo ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Irrigation Water ◽  
Sanjiang Plain ◽  
Irrigation Water Use Efficiency ◽  
The Sanjiang Plain ◽  
The Sustainable Development ◽  
Irrigation Water Use ◽  
Use Efficiency ◽  
Agricultural Water Resources

Abstract The evaluation of irrigation water efficiency plays an important role in the efficient use of agricultural water resources and the sustainable development of agriculture. In order to make the evaluation of irrigation water use efficiency indicators more comprehensive and scientific, this paper constructs a new optimal model of evaluation indicators. By combining the Driver-Pressure-State-Impact-Response (DPSIR) model with the Information Significance Difference (ISD) evaluation indicators model, a novel DPSIR-ISD evaluation indicators combination model was constructed. Ten riverside irrigation areas in the Sanjiang Plain of northeastern China were selected for analysis. The results show that the DPSIR-ISD model was used to reduce the number of indicators from 44 to 14; these 14 indicators reflected 91.88% of the original information. The DPSIR-ISD method proposed in this paper takes into account the completeness and simplicity of the indicators system, and is more in line with the actual situation in the field. These results can provide a simpler and more convenient system for optimizing indicators for the study of evaluation indicators used to analyze irrigation water use efficiency.

scholarly journals Analysis of Irrigation Canal System Characteristics in Heilongjiang Province and the Influence on Irrigation Water Use Efficiency

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1101 ◽  
Author(s):  
Tianxiao Li ◽  
Mengxin Sun ◽  
Qiang Fu ◽  
Song Cui ◽  
Dong Liu
Keyword(s):  
Fractal Dimension ◽  
Water Use Efficiency ◽  
Water Use ◽  
Irrigation Water ◽  
Heilongjiang Province ◽  
Canal System ◽  
Irrigation Water Use Efficiency ◽  
Irrigation Districts ◽  
Irrigation Water Use ◽  
Use Efficiency

Irrigation water use efficiency is a primary evaluation index that links economic production development with the efficient use of water resources. Canal water conveyance is an important part of irrigation, and the distribution characteristics of canal systems have an important influence on irrigation water use efficiency. In this paper, 75 irrigated districts in Heilongjiang Province in 2015 were selected as the study objects. The main, branch, lateral, and sublateral canals were graded into first-, second-, third-, and fourth-order classes, respectively. The irrigation districts were divided into three classes, that is, four-order, three-order, and two-order, according to the canal orders that the irrigation districts contained. The canal system framework was described by Horton’s law. The fractal dimension of the canal system was calculated based on the bifurcation ratio and length ratio of the canals. The relationships between fractal dimensions and irrigation water use efficiency were evaluated. The results showed that the irrigation water use efficiency of the four-order and three-order irrigation districts initially increased and then decreased with increases in the fractal dimension (D). In the irrigation districts, an irrigation water use efficiency of more than 10 × 103 hm2 and less than 0.67 × 103 hm2 was proportional to the increase in the fractal dimension, whereas the opposite result was found for districts with (0.67–10) × 103 hm2. The irrigation water use efficiency of the four-order and two-order irrigation districts with less than 3.3 × 103 hm2 had the greatest potential to increase the water use efficiency. Therefore, canal system reconstruction suggestions for different irrigation districts were provided. The results have important theoretical significance and practical value for the improvement of irrigation construction and the promotion of irrigation water efficiency planning.

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