Infiltration from a surface point source and drip irrigation: 1. The midpoint soil water pressure

1997 ◽  
Vol 33 (8) ◽  
pp. 1861-1867 ◽  
Author(s):  
P. Revol ◽  
M. Vauclin ◽  
G. Vachaud ◽  
B. E. Clothier
Keyword(s):  
Point Source ◽  
Soil Water ◽  
Drip Irrigation ◽  
Water Pressure ◽  
Surface Point

scholarly journals Experimental and Numerical Analysis of Drip Tape Layout for Irrigation of Sugarcane in Latosol

2015 ◽  
Vol 9 (1) ◽  
pp. 265-271 ◽  
Author(s):  
Kai Huang ◽  
Desuo Cai ◽  
Jinchuang Jinchuang ◽  
Wei Pan
Keyword(s):  
Point Source ◽  
Soil Water ◽  
Drip Irrigation ◽  
Water Movement ◽  
Discharge Rate ◽  
Single Point ◽  
Critical Parameters ◽  
Irrigation Uniformity ◽  
Emitter Discharge ◽  
Soil Water Movement

A laboratory soil column experiment was first conducted to analyze water movement in latosol of sugarcane field under drip irrigation from single-point source at different emitter discharge rates. Next, a mathematical model of soil water movement under drip irrigation from single-point source was built using Hydrus-3D, which could accurately simulate the shape of the wetted soil volume and the distribution of volumetric water content in the experiment. Further, a Hydrus- 3D model of soil water movement under drip irrigation from double-point source was built and then used to analyze the effects of critical parameters on irrigation uniformity. Results showed that emitter spacing affected irrigation uniformity greatly, but emitter discharge rate did not. According to the irrigation uniformity, project cost and operational management patterns, appropriate drip tape parameters for irrigation of sugarcane in latosol were determined: emitter discharge rate 1.38 L/h, emitter spacing 30 cm, and single-emitter irrigation volume 9.0 L.

Infiltration from a surface point source and drip irrigation: 2. An approximate time-dependent solution for wet-front position

1997 ◽  
Vol 33 (8) ◽  
pp. 1869-1874 ◽  
Author(s):  
P. Revol ◽  
B. E. Clothier ◽  
J.-C. Mailhol ◽  
G. Vachaud ◽  
M. Vauclin
Keyword(s):  
Point Source ◽  
Drip Irrigation ◽  
Time Dependent ◽  
Surface Point ◽  
Front Position ◽  
Time Dependent Solution

Soil water movement under a drip irrigation double-point source

2015 ◽  
Vol 15 (5) ◽  
pp. 924-932
Author(s):  
Lizhu Hou ◽  
Jie Shang ◽  
Jiangtao Liu ◽  
Haiyuan Lu ◽  
Zhiming Qi
Keyword(s):  
Soil Moisture ◽  
Point Source ◽  
Soil Water ◽  
Drip Irrigation ◽  
Double Point ◽  
Water Movement ◽  
Time Domain Reflectometry ◽  
Runoff Water ◽  
Surface Drip Irrigation ◽  
Soil Water Movement

Particularly in dry regions, the scarcity of high-quality fresh water has heightened the importance of urban runoff water re-use, leading as well to the improvement of water use efficiency through the surface drip irrigation method. Given the limited research on wetting front migration under a surface drip irrigation emitter, soil water movement under a double-point-source irrigation emitter was investigated. An experimental soil bin was designed and filled with silt loam soil, and time domain reflectometry and tensiometers were used to measure soil moisture contents and soil water potential, respectively. The results show that under the conditions of 6 hours of irrigation with two drippers each delivering 1.05 L hr−1 and spaced at 45 cm, the soil moisture content of the 0–30 cm layer increased rapidly and reached 0.29 cm3 cm−3, and was greater than that in the 30–60 cm layer as irrigation proceeded. After 6 hours the irrigation was stopped, such that in the redistribution phase, soil moisture of the top layer gradually decreased, while that of the sublayer gradually increased. The results indicate that 6 hours of irrigation under given emitter flow conditions produced adequate soil moisture down to 30 cm for most shallow-rooted crops.

scholarly journals Analysis of Soil Water Response to Grass Transpiration

2013 ◽  
Vol 1 (No. 3) ◽  
pp. 85-98
Author(s):  
Dohnal Michal ◽  
Dušek Jaromír ◽  
Vogel Tomáš ◽  
Herza Jiří
Keyword(s):  
Soil Water ◽  
Water Uptake ◽  
Preferential Flow ◽  
Water Movement ◽  
Control Volume ◽  
Water Pressure ◽  
Lower Boundary ◽  
Root Water Uptake ◽  
Water Dynamics ◽  
Soil Water Dynamics

This paper focuses on numerical modelling of soil water movement in response to the root water uptake that is driven by transpiration. The flow of water in a lysimeter, installed at a grass covered hillslope site in a small headwater catchment, is analysed by means of numerical simulation. The lysimeter system provides a well defined control volume with boundary fluxes measured and soil water pressure continuously monitored. The evapotranspiration intensity is estimated by the Penman-Monteith method and compared with the measured lysimeter soil water loss and the simulated root water uptake. Variably saturated flow of water in the lysimeter is simulated using one-dimensional dual-permeability model based on the numerical solution of the Richards’ equation. The availability of water for the root water uptake is determined by the evaluation of the plant water stress function, integrated in the soil water flow model. Different lower boundary conditions are tested to compare the soil water dynamics inside and outside the lysimeter. Special attention is paid to the possible influence of the preferential flow effects on the lysimeter soil water balance. The adopted modelling approach provides a useful and flexible framework for numerical analysis of soil water dynamics in response to the plant transpiration.

scholarly journals Yield Component Responses of the Brachiaria brizantha Forage Grass to Soil Water Availability in the Brazilian Cerrado

Agriculture ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 13
Author(s):  
Camila Thaiana Rueda da Silva ◽  
Edna Maria Bonfim-Silva ◽  
Tonny José de Araújo da Silva ◽  
Everton Alves Rodrigues Pinheiro ◽  
Jefferson Vieira José ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Availability ◽  
Water Pressure ◽  
Soil Water Potential ◽  
Yield Component ◽  
Forage Yield ◽  
Soil Water Availability ◽  
Grass Species ◽  
Forage Production ◽  
Brachiaria Brizantha

Brazil is one of the world’s largest producers of beef cattle and dairy products, which requires high forage yield to attend grass-fed animals’ demand. Among the grass species adopted in the forage production system in Brazil, the Brachiaria genus stands out. This genus comprises nearly 85% of all planted forage area. In general, forage production systems in Brazil are essentially rainfed, and thus susceptible to seasonal soil water stresses. Selecting the suitable Brachiaria cultivar for lands susceptible to periodic waterlogging and dry spells is crucial to enhance forage yield, and consequently, to reduce the environmental footprint of the livestock sector. In this research, we investigated the performance of three recent commercial Brachiaria brizantha cultivars (Piatã, BRS Paiaguás, and MG13 Braúna) extensively adopted in Brazil’s grazing systems subjected to different ranges of soil water potential. For three cutting periods, yield related-variables (e.g., plant height, leaf area, dry biomass, and water use efficiency) were measured. Our results point to the existence of a low drought-resistant trait among cultivars, indicating the need for releasing better-adapted cultivars to cope with reduced soil water availability. All cultivars achieved higher performance at soil water pressure head between −15 kPa and −25 kPa; and in general, the cultivar. Piatã showed slightly superior results to most of the treatments.

scholarly journals PRODUÇÃO E PÓS-COLHEITA DE DUAS CULTIVARES DE CEBOLA EM FUNÇÃO DA AGUA NO SOLO

Irriga ◽  
2016 ◽  
Vol 21 (4) ◽  
pp. 697-710
Author(s):  
Renato Carvalho Vilas Boas ◽  
Geraldo Magela Pereira ◽  
Joaquim Alves Lima Junior ◽  
Cândido Ferreira Oliveira Neto ◽  
Andre Luiz Pereira Silva
Keyword(s):  
Soil Water ◽  
Allium Cepa ◽  
Water Pressure ◽  
Matter Content ◽  
Dry Matter Content ◽  
Trickle Irrigation ◽  
Average Mass ◽  
Post Harvest ◽  
Soil Water Tension ◽  
Allium Cepa L

 PRODUÇÃO E PÓS-COLHEITA DE DUAS CULTIVARES DE CEBOLA EM FUNÇÃO DA AGUA NO SOLO  RENATO CARVALHO VILAS BOAS1; GERALDO MAGELA PEREIRA2; JOAQUIM ALVES DE LIMA JUNIOR3; CÂNDIDO FERREIRA OLIVEIRA NETO4 E ANDRE LUIZ PEREIRA SILVA5 1Engº Agrícola, Doutor, Departamento de Engenharia Agrícola-DEG/Universidade Federal de Lavras - UFLA/Lavras – MG, Fone: (35) 38291389, [email protected]º Agrícola, Prof. Doutor, Departamento de Engenharia Agrícola-DEG/Universidade Federal de Lavras -UFLA/Lavras – MG, Fone: (35) 38291389, [email protected]º Agrônomo, Prof. Doutor, Universidade Federal Rural da Amazônia - UFRA/Campus Capanema – PA, Fone: (91) 98160-6563, [email protected]º Agrônomo, Prof. Doutor, Universidade Federal Rural da Amazônia - UFRA/Campus Belém – PA, Fone:(91) 99148-7454, [email protected]º Agrônomo, Doutor, Universidade Estadual Paulista –UNESP/Jaboticabal – SP, Fone: (91) 98345-4940, [email protected]  1 RESUMO Objetivou-se, com este trabalho, avaliar o efeito de tensões da água no solo sobre a produção, classificação, teor de matéria seca e perda de massa de bulbos comerciais de duas cultivares de cebola, irrigadas por gotejamento. O experimento foi conduzido na área experimental do Departamento de Agricultura da Universidade Federal de Lavras com delineamento experimental em blocos casualizados, em esquema fatorial 2 x 6, com quatro repetições. Os tratamentos constituíram-se de duas cultivares de cebola, cultivar híbrida Optima F1 e cultivar não  híbrida Alfa Tropical, e seis tensões da água no solo, 15, 25, 35, 45, 60 e 75 kPa. Com os resultados concluiu-se que o híbrido Optima F1 apresentou melhores respostas com relação às seguintes características analisadas: produtividade de bulbos comerciais e massa média de bulbos comerciais. A cultivar Alfa apresentou maior teor de matéria seca e maior perda de massa durante o período de pós-colheita. Considerando o intervalo estudado (15 a 75 kPa), em ambas as cultivares deve-se irrigar no momento em que a tensão da água no solo estiver em torno de 15 kPa, na profundidade de 0,15 m, visando à obtenção de plantas mais produtivas, bulbos maiores e maior massa média de bulbos comerciais. Palavras-chave: Allium cepa L., irrigação localizada, tensão da água no solo  VILAS BOAS,R. C; PEREIRA, G. M.; LIMA JUNIOR, J. A.; OLIVEIRA NETO, C. F. E SILVA, A. L. P. PRODUCTION AND POST- HARVEST OF TWO ONION CULTIVARS IN FUNCTION OF SOIL WATER  2 ABSTRACT This work aimed at assessing the effect of different water tensions in soil on the development and production of two onion cultivars irrigated by drip system. The experiment was carried out in the experimental area of DAG/UFLA, from June to October 2008. The experimental design used was randomized block in factorial scheme 2 x 6, with four repetitions. The treatments comprised two onion cultivars, the hybrid Optima F1 and the non hybrid Alfa Tropical and six water tensions in the soil, i.e., 15, 25, 35, 45, 60 and 75 kPa.      The Optima Hybrid F1 presented the best answers regarding the following characteristics: yield of commercial bulbs and average mass of commercial bulbs . The cultivar Alfa showed higher dry matter content and increased mass loss during the post- harvest period. Considering the range studied ( 15 to 75 kPa) both cultivars should be irrigated when the water pressure in the soil is about 15 kPa at a depth of 0.15 m, in order to obtain more productive plants, larger bulbs and highest average mass of commercial bulbs . Keywords: Allium cepa L., trickle irrigation, soil water tension  

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