Showing papers in "Agricultural Water Management in 1993"

TL;DR: In this paper, a combination of soil water sampling and salt balance was used to study the development of soil salinity and the composition of the soil water, revealing an increase in adsorbed sodium, a decrease in advertisersorbed calcium and magnesium, and precipitation of a mixture of calcium and carbonate.

TL;DR: A long-term research project was initiated in 1983 on a 1.2 ha trickle-irrigated Vitis vinifera vineyard to address water management of White Riesling (WR), Chenin blanc (CB), and Cabernet Sauvignon (CS) grapes in central Washington.

TL;DR: In this article, the effect of three water use (WU) levels corresponding to 0.3, 0.6 and 0.9 Ep (Ep=Evaporation “A” pan ) on wetted soil volume, root distribution and yield of avocado cv was investigated over a 5-year period at Chania, Greece.

TL;DR: In this article, a 2-year field study was conducted to compare alternate-furrow irrigation to conventional every-furrow irrigation with soybeans at the South Central Research and Extension Center near Clay Center, Nebraska on a Hastings silt loam soil.

TL;DR: In this article, the polyacrylamid (PAM) hydrophilic gel Agrosoak® was tested as a soil conditioner for improving water availability to crops grown on sand dunes.

TL;DR: In this article, the effects of different irrigation practices and management options on the growth of wheat and cotton when irrigated with saline water were investigated in arid and semi-arid regions.

TL;DR: In this article, a simple mathematical model for forecasting reference crop evapotranspiration at three stations in California that represent humid, semi-arid, and arid weather conditions, covering three extremes in the California climate.

TL;DR: In this article, the authors evaluate the changes in soil water and salinity when conjunctive irrigation with canal (CW, 0.6 dS/m) and saline (SW, 12 dS /m) waters is practised in various cyclic/mixing modes and their associated effects on growth and yield of wheat, field experiments were conducted during 1989-1991 on a sandy loam soil.

TL;DR: It is shown that brackish water with an EC i of≥10 dS/m may be used for irrigation of certain forage crops without any yield reduction, and dry matter yield of salt grass was double the yield of the other species, indicating an advantage of this species under non-irrigated rangeland conditions.

TL;DR: In some seasons wide-spaced irrigation may result in less yield because too little water may be applied, particularly if the season has low rainfall and high evaporative demand.

TL;DR: In this article, the salinity response of wheat (Triticum aestivum L) to salinity stress at different growth stages and patterns of salinisation was studied in microlysimeters.

TL;DR: Sunflower had a higher transpiration rate, lower stomatal resistance, cooler canopy temperature, and higher leaf water potential compared to sorghum, perhaps because, in part, sunflower could exploit more water at deeper soil depths.

TL;DR: In this paper, the extent to which ground cover determines E sc, is uncertain and was evaluated with microlysimeters under two levels of canopy cover provided by spring wheat grown on two soils of contrasting texture.

TL;DR: In this paper, a field study was conducted to examine the relationship between in situ steady state infiltration rate (IR) and some textural and structural soil properties, including the effective porosity (EP), which is defined as total porosity minus soil water content at 0.33 bar.

TL;DR: In this paper, the effect of different organic materials (green manuring with Sesbania aculeata, farmyard manure, rice straw) and different levels of gypsum (to supply 2, 4, and 6 mEq Ca/l of sodic waters) in controlling the build up of Na in a calcareous sandy loam soil receiving sustained sodic irrigations under rice-wheat-maize system.

TL;DR: In this paper, Agrosoak®, a polyacrylamid (PAM) hydrophilic gel was tested as a soil conditioner for increasing the water absorbing capacity of sand dunes.

TL;DR: In this article, the authors made measurements of stomatal conductance (gs), leaf water potential (Ψ1), and leaf area index (L∗) in plantations of Eucalyptus camaldulensis and E tereticornis at Puradal, near Shimoga, Karnataka, southern India during 1988 and 1989.

TL;DR: In this article, a transient state model for numerical simulations of water and solute transport and plant water uptake (V-H model) was modified and applied to develop saline irrigation strategies for wheat grown in Northern parts of India.

TL;DR: In this paper, the authors used field experiments on sandy loam soils for two summer seasons to formulate optimum water management practices for peanuts growing under variable water supplies and found that scheduling irrigation to supply adequate water during the moisture sensitive periods of flowering and yield formation stages, yet allowing moderate stress at vegetative and maturity phases produced the optimum yield (2823 kg/ha) with maximum water-use efficiency (7.73 kg/h/mm) and water economy.

TL;DR: In this paper, a 10-year study of water draining from replicated mole drained and undrained plots under different cultivation systems was examined in a 10 year study, and it was shown that direct drilling caused higher surface runoff than ploughing due to surface compaction, although better subsoil structure development led to more rapid vertical movement of water.

TL;DR: The water table management model, DRAINMOD, was evaluated for possible applications under semi-arid climatic conditions by comparing the predicted midspan water table heights with the measured ones in four subsurface-drained test plots in Kota, India under the RAJAD (RAJasthan Agricultural Drainage) Research project as mentioned in this paper.

TL;DR: A 4-year field trial was carried out on a Typic Natraqualf to modify the surface runoff, to change the soil water regime and improve forage productivity as discussed by the authors.

TL;DR: In this paper, a daily water-balance simulation technique on a cropping system of rainfed pre-monsoon rice (Aus) followed by irrigated T. Aman was used to estimate for representative stations in 24 districts the probable planting dates and supplemental irrigation required to avoid significant water deficit during the reproductive phase.

TL;DR: In this article, a regression approach to the volume balance technique was used to predict the infiltration characteristics of a cracking clay soil using automatic data gathering techniques, and the analysis technique enabled the fitting of any form of infiltration function by least squares regression.

TL;DR: In this article, a strong linear relationship was found between the dry above ground biomass and evapotranspiration (ET) for winter wheat and maize on a salt-affected soil in the Huang Huai Hai river plain of China.

TL;DR: In this article, the authors describe the design and construction of a set of lysimeters, consisting of four field tanks, each with one cubic meter effective volume, made of a galvanized sheet.

TL;DR: In this paper, a methodology was developed for planning irrigation system improvement strategies in irrigated areas underlain by saline water aquifers with a rising groundwater table, and the two important components of the methodology are: (1) simulation of groundwater behaviour which is accomplished through a two-dimensional finite difference groundwater model; and (2) development of appropriate irrigation system improvements plans that would minimise groundwater accretions.

TL;DR: In this paper, microsimeter data were used to evaluate four empirical evaporation models: the radiation models of Ritchie (1972), Cooper et al. (1983), and Rees (1986), and a transpiration efficiency (TE) model of Fischer (1979).

TL;DR: In this article, four simple physically based infiltration models for furrow irrigation were developed and their performance compared with a kinematic wave irrigation model in which infiltration could vary spatially or be constant.

TL;DR: In this article, an irrigation scheduling model (SimISP, Simulating Irrigation Scheduling for Potatoes) was developed to determine the irrigation requirements of potato crop using daily radiation, temperature, humidity, wind speed and precipitation and crop and soil parameters to estimate, evaporation (E ), transpiration Tr ) and crop growth.