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1. An alternative to define canopy surface temperature bounds

Author:
Widmoser, P.
Source:
Agricultural water management 2010 v.97 no.2 pp. 224-230
ISSN:
0378-3774
Subject:
crops; crop production; water requirement; plant-water relations; plant stress; water stress; homeostasis; energy balance; biomarkers; canopy; temperature; surface temperature; measurement; thermometers; infrared radiation; reference standards; equations; prediction; estimation; validity
Abstract:
... Canopy temperature, which may be estimated by infrared thermometry (IRT), can serve as an indicator of plant water status. proposed the nowadays much used concept of the crop water stress index, which relates observed canopy surface temperature (T s ) to maxima and minima temperature bounds. defined those bounds on the basis of the energy balance. Those bounds vary with the meteorological situatio ...
DOI:
10.1016/j.agwat.2009.09.012

2. Analyzing soil soluble phosphorus transport with root-phosphorus-uptake applying an inverse method

Author:
Zhu, Xiangming; Zuo, Qiang; Shi, Jianchu
Source:
Agricultural water management 2010 v.97 no.2 pp. 291-299
ISSN:
0378-3774
Subject:
soil nutrient dynamics; soil nutrients; phosphorus; soluble solids; solubility; soil transport processes; root systems; roots; soil fertility; soil-plant interactions; plant nutrition; nutrient uptake; water uptake; irrigation water; soil water; water flow; hydrologic models; simulation models; biogeochemical cycles; model validation
Abstract:
... Soil soluble phosphorus (P) transport with root-phosphorus-uptake (RPU) is a critical process for plant growth, cycling of P in soil-plant systems and environment protection. However, modeling soil soluble P transport is extremely challenging because it is difficult to measure the RPU distribution directly, especially in the field. In this study, an inverse method, which was utilized successfully ...
DOI:
10.1016/j.agwat.2009.09.020

3. Application of the relevance vector machine to canal flow prediction in the Sevier River Basin

Author:
Flake, John; Moon, Todd K.; McKee, Mac; Gunther, Jacob H.
Source:
Agricultural water management 2010 v.97 no.2 pp. 208-214
ISSN:
0378-3774
Subject:
freshwater; water management; arid zones; irrigation; irrigated farming; irrigation requirement; water requirement; prediction; probability analysis; hydrologic models; probabilistic models; water use; watersheds; basins; water flow; data analysis; irrigation canals; Utah
Abstract:
... This work addresses management of water for irrigation in arid regions where significant delays between the time of order and the time of delivery present major difficulties. Motivated by improvements to water management that will be facilitated by an ability to predict water demand, it employs a data-driven approach to developing canal flow prediction models using the relevance vector machine (RV ...
DOI:
10.1016/j.agwat.2009.09.010

4. Assessment of a groundwater quality monitoring network using vulnerability mapping and geostatistics: A case study from Heretaunga Plains, New Zealand

Author:
Baalousha, Husam
Source:
Agricultural water management 2010 v.97 no.2 pp. 240-246
ISSN:
0378-3774
Subject:
groundwater; water quality; detection; groundwater contamination; pollutants; environmental monitoring; sampling; geographical distribution; spatial distribution; thematic maps; hydrogeology; geostatistics; kriging; spatial data; data collection; optimization; case studies; basins; nitrates; New Zealand
Abstract:
... A groundwater monitoring network can provide quantity and quality data necessary to make informed decisions regarding the state of the environment. A properly designed monitoring system provides a representative understanding of the state of the monitored area. The selection of the optimum number of monitoring sites and their spatial distribution is a major challenge for the hydrogeologist. On the ...
DOI:
10.1016/j.agwat.2009.09.013

5. Building a metamodel of an irrigation district distributed-parameter model

Author:
Galelli, S.; Gandolfi, C.; Soncini-Sessa, R.; Agostani, D.
Source:
Agricultural water management 2010 v.97 no.2 pp. 187-200
ISSN:
0378-3774
Subject:
freshwater; water management; irrigation; irrigation management; irrigated farming; flood irrigation; irrigation requirement; water requirement; water use; decision making; hydrologic models; simulation models; mathematical models; new methods; stochastic processes; equations; inland waters; rivers; Italy
Abstract:
... Complex decision-making problems, related to planning and management of irrigation water resources, generally preclude the use of large, distributed-parameter models, which are then commonly substituted by lumped-parameter models. This paper, with the aim of improving the quality of these latter, introduces a new approach for their design. This approach is based on metamodelling, which proposes to ...
DOI:
10.1016/j.agwat.2009.09.007

6. Carbon and nitrogen cycling in a tropical Brazilian soil cropped with sugarcane and irrigated with wastewater

Author:
Leal, Rafael Marques Pereira; Firme, Lilian Pittol; Herpin, Uwe; da Fonseca, Adriel Ferreira; Montes, Célia Regina; dos Santos Dias, Carlos Tadeu; Melfi, Adolpho José
Source:
Agricultural water management 2010 v.97 no.2 pp. 271-276
ISSN:
0378-3774
Subject:
tropical agriculture; sugarcane; Saccharum; irrigated farming; wastewater irrigation; sewage effluent; tropical soils; irrigated soils; soil fertility; biogeochemical cycles; soil nutrient dynamics; soil-plant interactions; soil solution; nitrogen; nitrates; carbon; dissolved organic carbon; plant nutrition; nutrient uptake; crop yield; risk assessment; leaching; groundwater contamination; Brazil
Abstract:
... Carbon (C) and nitrogen (N) dynamics in agro-systems can be altered as a consequence of treated sewage effluent (TSE) irrigation. The present study evaluated the effects of TSE irrigation over 16 months on N concentrations in sugarcane (leaves, stalks and juice), total soil carbon (TC), total soil nitrogen (TN), NO₃ ⁻-N in soil and nitrate (NO₃ ⁻) and dissolved organic carbon (DOC) in soil solutio ...
DOI:
10.1016/j.agwat.2009.09.018

7. Comparison of soil water content and corn yield in furrow and conventional ridge sown systems in a semiarid region of China

Author:
Jin, Y.H.; Zhou, D.W.; Jiang, S.C.
Source:
Agricultural water management 2010 v.97 no.2 pp. 326-332
ISSN:
0378-3774
Subject:
arid zones; crop production; corn; Zea mays; semiarid soils; tillage; furrows; soil ridges; sowing; depth; optimization; soil water; soil water content; dry environmental conditions; drought; soil temperature; methodology; plant available water; plant growth; grain yield; China
Abstract:
... Water deficits and unusually warm soil temperatures can adversely affect conventional ridge sown systems. Increasingly serious water and temperature issues associated with global climate change may be problematic in the future, particularly in semiarid regions. This study explored the soil water and crop yield benefits of switching the sowing location of corn from ridges to furrows. Experiments we ...
DOI:
10.1016/j.agwat.2009.10.002

8. Evaluation of the flood mitigation effect of a Paddy Field Dam project

Author:
Yoshikawa, N.; Nagao, N.; Misawa, S.
Source:
Agricultural water management 2010 v.97 no.2 pp. 259-270
ISSN:
0378-3774
Subject:
crop production; rice; Oryza sativa; paddy soils; flooded conditions; agricultural runoff; water management; dams (hydrology); protective effect; hydrologic models; rain; floods; water flow; kinematics; velocity; hills; fields; stream channels; drainage channels; water balance; drainage systems; Japan
Abstract:
... To mitigate flood damage due to a recent increase in the frequency and magnitude of heavy rainfall events, the Kamihayashi district in Niigata prefecture, Japan, has undertaken flood mitigation measures using paddy fields by installing runoff control devices in drainage boxes of paddy field plots. The purpose of this study is to evaluate the flood mitigation performance of the Paddy Field Dam proj ...
DOI:
10.1016/j.agwat.2009.09.017

9. Evaluation of the influence of irrigation methods and water quality on sugar beet yield and water use efficiency

Author:
Hassanli, Ali Morad; Ahmadirad, Shahram; Beecham, Simon
Source:
Agricultural water management 2010 v.97 no.2 pp. 357-362
ISSN:
0378-3774
Subject:
crop production; sugar beet; Beta vulgaris subsp. vulgaris; irrigated farming; irrigation systems; furrow irrigation; microirrigation; wastewater irrigation; water resources; wastewater; freshwater; water quality; plant growth; water use efficiency; crop yield; roots; sugar content; irrigation management; process monitoring; water stress; soil water; root growth; Iran
Abstract:
... Rapid urbanization and industrialization have increased the pressure on limited existing fresh water to meet the growing needs for food production. Two immediate responses to this challenge are the efficient use of irrigation technology and the use of alternative sources of water. Drip irrigation methods may play an important role in efficient use of water but there is still limited information on ...
DOI:
10.1016/j.agwat.2009.10.010

10. Evapotranspiration and crop coefficient of Populus euphratica Oliv forest during the growing season in the extreme arid region northwest China

Author:
Hou, L.G.; Xiao, H.L.; Si, J.H.; Xiao, S.C.; Zhou, M.X.; Yang, Y.G.
Source:
Agricultural water management 2010 v.97 no.2 pp. 351-356
ISSN:
0378-3774
Subject:
arid lands; oases; riparian forests; Populus; tree growth; dry environmental conditions; water requirement; arid soils; hydrologic models; growth models; crop models; mathematical models; growing season; evapotranspiration; soil water; weather; energy balance; seasonal variation; estimation; equations; reference standards; crop coefficient; China
Abstract:
... Based on successive observation, fifteen-day evapotranspiration (ET c ) of Populus euphratica Oliv forest, in the extreme arid region northwest China, was estimated by application of Bowen ratio-energy balance method (BREB) during the growing season in 2005. During the growing season in 2005, total ET c was 446.96mm. From the beginning of growing season, the ET c increased gradually, and reached i ...
DOI:
10.1016/j.agwat.2009.09.022

11. Influence of crop load on maximum daily trunk shrinkage reference equations for irrigation scheduling of early maturing peach trees

Author:
Conejero, W.; Ortuño, M.F.; Mellisho, C.D.; Torrecillas, A.
Source:
Agricultural water management 2010 v.97 no.2 pp. 333-338
ISSN:
0378-3774
Subject:
crop production; peaches; Prunus persica; irrigated farming; irrigation scheduling; irrigation; prediction; estimation; crop models; hydrologic models; plant-water relations; climatic factors; water potential; plant density; plant growth; fruiting; measurement; tree trunk; shrinkage; diurnal variation; phenology; equations; reference standards
Abstract:
... The effects of high crop load (unthinned trees, 22-23 fruits cm⁻² of trunk cross-sectional area (TCSA)), commercial crop load (3-4 fruits cm⁻² of TCSA), and no crop load (all fruitlets removed) on maximum daily trunk shrinkage (MDS), trunk growth rate (TGR) and stem water potential (Ψ stem) were studied during the fruit growth period and 20 days following harvest in fully irrigated early maturing ...
DOI:
10.1016/j.agwat.2009.10.003

12. Influence of streambank fencing with a cattle crossing on riparian health and water quality of the Lower Little Bow River in Southern Alberta, Canada

Author:
Miller, J.; Chanasyk, D.; Curtis, T.; Entz, T.; Willms, W.
Source:
Agricultural water management 2010 v.97 no.2 pp. 247-258
ISSN:
0378-3774
Subject:
streams; rivers; riparian areas; water quality; water pollution; cattle; cattle production; excreta; environmental protection; riverbank protection; best management practices; fences; protective effect; environmental assessment; indicator species; estuarine sediments; nutrients; bacteria; microbiological quality; Alberta
Abstract:
... The goal of beneficial management practices (BMPs) such as streambank fencing is to prevent or reduce water pollution of surface water bodies. We conducted a four year (2004-2007) study on a fenced 800-m reach of the Lower Little Bow (LLB) River in southern Alberta, Canada. Our hypothesis was that riparian health would be improved by streambank fencing, and that cattle exclusion would prevent wate ...
DOI:
10.1016/j.agwat.2009.09.016

13. Integrating remote sensing, census and weather data for an assessment of rice yield, water consumption and water productivity in the Indo-Gangetic river basin

Author:
Cai, X.L.; Sharma, B.R.
Source:
Agricultural water management 2010 v.97 no.2 pp. 309-316
ISSN:
0378-3774
Subject:
crop production; rice; crop yield; plant growth; water requirement; water use; prediction; estimation; hydrologic models; growth models; crop models; data collection; remote sensing; plant density; census data; evapotranspiration; weather; model validation; accuracy; thematic maps; basins; India; Nepal; Bangladesh; Pakistan; Ganges River
Abstract:
... Crop consumptive water use and productivity are key elements to understand basin water management performance. This article presents a simplified approach to map rice (Oryza sativa L.) water consumption, yield, and water productivity (WP) in the Indo-Gangetic Basin (IGB) by combining remotely sensed imagery, national census and meteorological data. The statistical rice cropped area and production ...
DOI:
10.1016/j.agwat.2009.09.021

14. Modelling point and diffuse source pollution of nitrate in a rural lowland catchment using the SWAT model

Author:
Lam, Q.D.; Schmalz, B.; Fohrer, N.
Source:
Agricultural water management 2010 v.97 no.2 pp. 317-325
ISSN:
0378-3774
Subject:
lowlands; watersheds; nutrients; water pollution; point source pollution; diffusion; water quality; long term effects; risk assessment; hydrologic models; simulation models; pollution load; nitrates; water flow; agricultural land; pastures; wastewater treatment; lowland forests; environmental assessment; probabilistic models; model validation; Germany
Abstract:
... The assessments of potential environmental impacts of point and diffuse source pollution at regional scales are necessary to achieve the sustainable development of natural resources such as land and water. Nutrient related diffuse source pollutant inputs can enhance crop growth and improve soil eutrophication. However, excessive nutrient input can result in the impairment of water quality. The obj ...
DOI:
10.1016/j.agwat.2009.10.004

15. Optimizing irrigation water use in the West Bank, Palestine

Author:
Nazer, Dima W.; Tilmant, Amaury; Mimi, Ziad; Siebel, Maarten A.; Van der Zaag, Pieter; Gijzen, Huub J.
Source:
Agricultural water management 2010 v.97 no.2 pp. 339-345
ISSN:
0378-3774
Subject:
arid lands; crop production; vegetables; citrus fruits; irrigated farming; irrigation scheduling; water use; water allocation; optimization; hydrologic models; crop models; linear models; cropping systems; West Bank
Abstract:
... We examine optimal irrigation water allocation on the West Bank using a linear mathematical programming model. Our analysis involves five agricultural zones and five fruit and vegetable crops: tomatoes, cucumbers, eggplant, squash and citrus. We analyze three scenarios: (1) maintaining the existing cropping patterns, (2) maximizing profit under water and land availability constraints, and (3) maxi ...
DOI:
10.1016/j.agwat.2009.10.006

16. Partial root-zone irrigation enhanced soil enzyme activities and water use of maize under different ratios of inorganic to organic nitrogen fertilizers

Author:
Li, Fusheng; Yu, Jiangmin; Nong, Mengling; Kang, Shaozhong; Zhang, Jianhua
Source:
Agricultural water management 2010 v.97 no.2 pp. 231-239
ISSN:
0378-3774
Subject:
crop production; corn; Zea mays; irrigated farming; irrigation systems; rhizosphere; fertilizer application; nitrogen fertilizers; irrigated soils; soil fertility; soil chemistry; enzymes; urease; catalase; acid phosphatase; beta-fructofuranosidase; enzyme activity; plant physiology; water use efficiency; soil water; water uptake; canopy; dry matter accumulation
Abstract:
... Partial root-zone irrigation (PRI) is an effective water-saving irrigation method but the heterogeneous soil moisture distribution that may affect soil enzymatic activities and crop water use. With pot-grown maize, we investigated the dry mass accumulation, crop water-use efficiency and the activities of four major soil enzymes from jointing to grain filling stages of maize plants subjected to PRI ...
DOI:
10.1016/j.agwat.2009.09.014

17. Prediction of annual reference evapotranspiration using climatic data

Author:
Li, Yi; Horton, Robert; Ren, Tusheng; Chen, Chunyan
Source:
Agricultural water management 2010 v.97 no.2 pp. 300-308
ISSN:
0378-3774
Subject:
crop production; irrigated farming; plant growth; water requirement; irrigation requirement; prediction; estimation; hydrologic models; probabilistic models; evapotranspiration; weather; meteorological parameters; temporal variation; evaporation; evaporation rate; sampling; data analysis; equations; calibration; methodology; validity; China
Abstract:
... It is important to determine how well ET o can be estimated from easily observed E pan (free water evaporation measured by a pan) measurements and the other climatic data. Our objectives are to predict annual ET o with E pan data (with a calibrated k p (=ET o/E pan)) and with a 4-variable regression function method. The significance of the trends of E pan, ET o and k p series were detected. The wh ...
DOI:
10.1016/j.agwat.2009.10.001

18. Simulation of nitrogen leaching from a fertigated crop rotation in a Mediterranean climate using the EU-Rotate_N and Hydrus-2D models

Author:
Doltra, J.; Muñoz, P.
Source:
Agricultural water management 2010 v.97 no.2 pp. 277-285
ISSN:
0378-3774
Subject:
crop production; vegetables; crop rotation; irrigated farming; fertigation; irrigation; risk assessment; leaching; nitrates; crop models; hydrologic models; soil types; soil fertility; soil-plant interactions; nutrient uptake; soil nutrient dynamics; methodology; accuracy; model validation; Spain
Abstract:
... Two different modeling approaches were used to simulate the N leached during an intensively fertigated crop rotation: a recently developed crop-based simulation model (EU-Rotate_N) and a widely recognized solute transport model (Hydrus-2D). Model performance was evaluated using data from an experiment where four N fertigation levels were applied to a bell pepper-cauliflower-Swiss chard rotation in ...
DOI:
10.1016/j.agwat.2009.09.019

19. Simulations of storm hydrographs in a mixed-landuse watershed using a modified TR-20 model

Author:
Jang, T.I.; Kim, H.K.; Im, S.J.; Park, S.W.
Source:
Agricultural water management 2010 v.97 no.2 pp. 201-207
ISSN:
0378-3774
Subject:
watersheds; water management; floods; runoff; wet season; storms; irrigated farming; paddy soils; rice; Oryza sativa; watershed hydrology; seasonal variation; probability analysis; hydrologic models; computer software; new methods; prediction; weather; land use; water use; South Korea
Abstract:
... Most flood damage in Korea is caused by heavy rainfall events and typhoons during the summer rainy season. A modified Natural Resources Conservation Service (NRCS) TR-20 model, TR-20-RICE, was developed to investigate the storm runoff characteristics of a 385-ha mixed-landuse watershed in Korea. The TR-20-RICE not only used the rainfall excess and hydrologic flood routing components of the origina ...
DOI:
10.1016/j.agwat.2009.09.004

20. Usage of SUBSTOR model in potato yield prediction

Author:
Šťastná, M.; Toman, F.; Dufková, J.
Source:
Agricultural water management 2010 v.97 no.2 pp. 286-290
ISSN:
0378-3774
Subject:
crop production; Solanum tuberosum; potatoes; crop yield; tubers; prediction; weather; precipitation; wet environmental conditions; dry environmental conditions; growth models; crop models; plant growth; accuracy; model validation; crop management; longitudinal studies; Czech Republic
Abstract:
... The study focused on evaluation of SUBSTOR-Potato model and its utilization in potato grows management. The experimental field used for the model evaluation was located in Žabčice—South Moravian region with altitudes of 179m above the sea level. Tuber yield served as reference for the model evaluation. Nine years experimental data set (1994-2002) was used for the model evaluation. Rosara cultivar ...
DOI:
10.1016/j.agwat.2009.09.015