Using spectral reflectance to document water stress in bermudagrass grown on water repellent sandy soils

2007 ◽  
Vol 21 (17) ◽  
pp. 2385-2389 ◽  
Author(s):  
Dara M. Park ◽  
John L. Cisar ◽  
Karen E. Williams ◽  
Dayle K. McDermitt ◽  
William P. Miller ◽  
...  
Keyword(s):  
Water Stress ◽  
Spectral Reflectance ◽  
Sandy Soils ◽  
Water Repellent

scholarly journals Determination of water stress with spectral reflectance on sweet corn (Zea mays L.) using classification tree (CT) analysis

2013 ◽  
Vol 100 (1) ◽  
pp. 81-90 ◽  
Author(s):  
Levent Genc ◽  
Melis Inalpulat ◽  
Unal Kizil ◽  
Mustafa Mirik ◽  
Scot E. Smith ◽  
...  
Keyword(s):  
Zea Mays ◽  
Water Stress ◽  
Spectral Reflectance ◽  
Zea Mays L ◽  
Sweet Corn ◽  
Classification Tree ◽  
Ct Analysis

scholarly journals Using Hyperspectral and Multispectral Indices to Detect Water Stress for an Urban Turfgrass System

Agronomy ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 439 ◽  
Author(s):  
Badzmierowski ◽  
McCall ◽  
Evanylo
Keyword(s):  
Water Stress ◽  
Spectral Reflectance ◽  
Festuca Arundinacea ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
High Water ◽  
Management Tool ◽  
N Accumulation ◽  
Spatial Coverage ◽  
Reflectance Data

Spectral reflectance measurements collected from hyperspectral and multispectral radiometers have the potential to be a management tool for detecting water and nutrient stress in turfgrass. Hyperspectral radiometers collect hundreds of narrowband reflectance data compared to multispectral radiometers that collect three to ten broadband reflectance data for a cheaper cost. Spectral reflectance data have been used to create vegetation indices such as the normalized difference vegetation index (NDVI) and the simple ratio vegetation index (RVI) to assess crop growth, density, and fertility. Other indices such as the water band index (WBI) (narrowband index) and green-to-red ratio index (GRI) (both broadband and narrowband index) have been proposed to predict soil moisture status in turfgrass systems. The objective of this study was to compare the value of multispectral and hyperspectral radiometers to assess soil volumetric water content (VWC) and tall fescue (Festuca arundinacea Schreb.) responses. The multispectral radiometer VI had the strongest relationships to turfgrass quality, biomass, and tissue N accumulation during the trial period (April 2017–August 2018). Soil VWC had the strongest relationship to WBI (r = 0.60), followed by GRI and NDVI (both r = 0.54) for the 0% evapotranspiration (ET). Nonlinear regression showed strong relationships at high water stress periods in each year for WBI (r = 0.69–0.79), GRI (r = 0.64–0.75), and NDVI (r = 0.58–0.79). Broadband index data collected using a mobile multispectral sensor is a cheaper alternative to hyperspectral radiometry and can provide better spatial coverage.

Water repellence in sandy soils of South-Western Australia. II. Some chemical characteristics of the hydrophobic skins

Soil Research ◽  
1972 ◽  
Vol 10 (1) ◽  
pp. 35 ◽  
Author(s):  
FJ Roberts ◽  
BA Carbon
Keyword(s):  
Organic Matter ◽  
Diethyl Ether ◽  
Cold Water ◽  
Sandy Soils ◽  
Prolonged Treatment ◽  
Water Repellent ◽  
Chemical Characteristics ◽  
Produce Water ◽  
Water Repellence ◽  
Humic Fraction

The hydrophobic organic skins on sand grains were resistant to removal by solvents such as cold water, concentrated acid, diethyl ether, ethanol, benzene, chloroform, and acetone. Prolonged treatment with hot diethyl ether, ethanol, and benzene removed part of the coating. Treatment with dilute solutions of alkali removed the skin as suspended particles. Compounds within the very stable humic fraction of the soil organic matter appeared to be mainly responsible for water repellence in soils. Deposits of fresh organic materials could also produce water repellent properties.

Canopy spectral reflectance for crop water stress assessment in wheat ( Triticum aestivum, L.)*

2020 ◽  
Author(s):  
Narendra Singh Chandel ◽  
Yogesh Anand Rajwade ◽  
Kamlesh Golhani ◽  
Prem Shankar Tiwari ◽  
Kumkum Dubey ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Water Stress ◽  
Spectral Reflectance ◽  
Triticum Aestivum L ◽  
Crop Water ◽  
Stress Assessment ◽  
Canopy Spectral Reflectance ◽  
Crop Water Stress

Sugar Beet Response to Water Stress in Sandy Soils

1977 ◽  
Vol 20 (3) ◽  
pp. 0469-0473 ◽  
Author(s):  
E. C. Stegman ◽  
A. Bauer
Keyword(s):  
Water Stress ◽  
Sugar Beet ◽  
Sandy Soils ◽  
Response To Water

A numerical model of heat and water movement in furrow-sown water repellent sandy soils

1996 ◽  
Vol 32 (10) ◽  
pp. 3051-3061 ◽  
Author(s):  
Bangjie Yang ◽  
Paul S. Blackwell ◽  
David F. Nicholson
Keyword(s):  
Numerical Model ◽  
Water Movement ◽  
Sandy Soils ◽  
Water Repellent

Induced uneven spatial distribution of agrochemicals due to preferential flow in water repellent soils and its remediation by surfactant

2020 ◽  
Author(s):  
Felix Abayomi Ogunmokun ◽  
Rony Wallach
Keyword(s):  
Spatial Distribution ◽  
Soil Water ◽  
Soil Profile ◽  
Preferential Flow ◽  
Sandy Soils ◽  
Water Repellency ◽  
Treated Wastewater ◽  
Water Repellent ◽  
Soil Water Repellency ◽  
Mediterranean Countries

<p>Soil water repellency is a common feature of dry soils under permanent vegetation and drought conditions. Soil-water hydrology is markedly affected by soil-water repellency as it hinders infiltration, leading to enhanced surface runoff and soil erosion. Although this phenomenon was primarily ascribed to sandy soils, it has been observed in loam, clay, and peat soils in dry and humid regions. One detrimental effect of soil water repellency on plants is the reduction of soil water availability that stems from the non-uniform water retention and flow in preferential pathways (gravity-induced fingers) with relatively dry soil volume among these paths. It was recently discovered that prolonged irrigation with treated wastewater, a widely used alternative in Israel and other Mediterranean countries due to the limited freshwater, triggers soil water repellency which invariably resulted in preferential flow development in the field. Due to climate change events, the use of treated wastewater for irrigation as a means of freshwater conservation is expected to widen, including in countries that are not considered dry.</p><p>While a vast amount of research has been devoted to characterizing the preferential flow in water repellent soils, the effect of this flow regime on the spatial distribution of salt and fertilizers in the root zone was barely investigated. Results from a commercial citrus orchard irrigated with treated wastewater that includes the spatial and temporal distribution of preferential flow in the soil profile measured by ERT will be demonstrated. The associated spatial distribution of salinity, nitrate, phosphate, and SAR in the soil profile will be shown as well.  We investigated the efficacy of two nonionic surfactants application to remediate hydrophobic sandy soils both in the laboratory and field. The effect of the surfactant application to the water repellent soils in the orchards on the spatial distribution of soil moisture and the associated agrochemicals will be presented and discussed.</p>

Water relations of woody plants on contrasting soils during drought: does edaphic compensation account for dry rainforest distribution?

2009 ◽  
Vol 57 (8) ◽  
pp. 629 ◽  
Author(s):  
Timothy J. Curran ◽  
Peter J. Clarke ◽  
Nigel W. M. Warwick
Keyword(s):  
Water Stress ◽  
Water Potential ◽  
Water Relations ◽  
Soil Type ◽  
Plant Traits ◽  
Sandy Soils ◽  
Soil Types ◽  
Severe Drought ◽  
Ecotypic Differentiation ◽  
Compensation Hypothesis

The occurrence of dry rainforest in climates considered drier than the recognised limit for rainforest has been explained by the edaphic compensation hypothesis, which proposed that finer-textured soils facilitate the occurrence of rainforest at climatic extremes. We tested this by examining the effect of soil type on the water relations and plant traits of four dry rainforest species, during a severe drought and subsequent non-drought periods. We predicted plants growing in sandy soils would exhibit higher levels of water stress (lower predawn water potential and stomatal conductance) and possess morphological and physiological traits that more typically reflect drought resistance (late leaf fall in deciduous species, low specific leaf area, vertical leaf angles and stomata that close at low water potential) than those growing in loam soils. During drought, levels of water stress were similar across soil types, while post-drought plants on sandy soils were less stressed. Soil type did not cause shifts in drought tolerance traits, suggesting there has been no ecotypic differentiation of dry rainforest species across soil types for these traits. Hence, we found no support for the edaphic compensation hypothesis in adult plants; future studies should consider other life-cycle stages, such as seedlings.

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