Understanding Soil Surface Water Content Using Light Reflection Theory: A Novel Color Analysis Technique Considering Variability in Light Intensity

2018 ◽  
Vol 48 (5) ◽  
pp. 20180320 ◽  
Author(s):  
Vinay Kumar Gadi ◽  
Ankit Garg ◽  
Indu Priya Manogaran ◽  
Sreedeep Sekharan ◽  
Hong-Hu Zhu
Keyword(s):  
Surface Water ◽  
Light Intensity ◽  
Water Content ◽  
Soil Surface ◽  
Light Reflection ◽  
Color Analysis ◽  
Analysis Technique ◽  
Reflection Theory

Measuring soil surface water content in irrigated areas of southern Tunisia using full-waveform inversion of proximal GPR data

2008 ◽  
Vol 6 (6) ◽  
pp. 403-410 ◽  
Author(s):  
Sébastien Lambot ◽  
Evert Slob ◽  
Diana Chavarro ◽  
Maciek Lubczynski ◽  
Harry Vereecken
Keyword(s):  
Surface Water ◽  
Water Content ◽  
Waveform Inversion ◽  
Soil Surface ◽  
Full Waveform Inversion ◽  
Full Waveform ◽  
Southern Tunisia

scholarly journals Commercial Amendments for Sand-based Root Zones: Review and Interpretation

2013 ◽  
Vol 23 (6) ◽  
pp. 803-813 ◽  
Author(s):  
Edward L. McCoy
Keyword(s):  
Surface Water ◽  
Water Content ◽  
Root Zone ◽  
Soil Surface ◽  
Exchange Capacity ◽  
Inorganic Materials ◽  
Published Data ◽  
Root Zones ◽  
Inorganic Amendments

Amendments used in sand-based root zones are typically native peats, composts, or inorganic materials of diverse mineralogy. Literature-based guidelines for amendment inclusion include root zone capillary porosity (CP) values exceeding 0.2 m3·m−3 or soil surface water contents exceeding 0.1 m3·m−3. It is also suggested that the cation exchange capacity (CEC) need not exceed 4 cmolc·kg−1. Summarizing published data, native peat added to a U.S. Golf Association (USGA) guideline sand yielding organic matter (OM) content values of ≈15 g·kg−1 would typically yield benchmark values of CP = 0.2 m3·m−3, surface water content = 0.1 m3·m−3, and CEC values between 3 and 4 cmolc·kg−1. This OM content is roughly equivalent to 15% by volume of a fibric sphagnum or 7.5% by volume of a hemic reed-sedge. By comparison 15% by volume of an inorganic amendment would likely result in CP and surface water content values less than the benchmark values, and CEC values between 1.5 and 4 cmolc·kg−1. However, the CP benchmark measured at 30 cm of soil water suction should be re-evaluated because it may bias against the use of biosolids compost and inorganic amendments that reduce the thickness of the capillary fringe and create a broader pore size distribution. Also a weak relationship has been observed between longer-term turfgrass quality and 30-cm CP values. Measurement of CP at 40-cm suction would be a better indication of water retention in sand-based root zones for all amendment types. Lastly, inorganic amendments produce a drier root zone that may be preferred for both playability and long-term agronomic concerns.

scholarly journals Analysis of air-launched ground-penetrating radar techniques to measure the soil surface water content

2006 ◽  
Vol 42 (11) ◽  
Author(s):  
Sébastien Lambot ◽  
Lutz Weihermüller ◽  
Johan A. Huisman ◽  
Harry Vereecken ◽  
Marnik Vanclooster ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Content ◽  
Ground Penetrating Radar ◽  
Soil Surface ◽  
Ground Penetrating

The contribution of a temporary watertable to surface soil water content and the establishment of surface sown seeds

1983 ◽  
Vol 23 (123) ◽  
pp. 407 ◽  
Author(s):  
PS Cornish
Keyword(s):  
Surface Water ◽  
Water Potential ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Free Water ◽  
Soil Surface ◽  
Field Capacity ◽  
Bare Soil ◽  
Rate Of Evaporation

A temporary watertable was established in large undisturbed cores of a podzolic (duplex) soil in a glasshouse. The upward flow of water from the watertable to the soil surface through a 7 d drying cycle was assessed by measuring soil water content and matric potential, and the rate of evaporation from the soil surface (by weighing). Evaporation from the soil surface (Ea) closely followed evaporation from a free water surface (Eo), with little change in surface water potential or content until the watertable was depleted. This indicated that soil evaporation was balanced by the upward flux from the watertable, at rates up to 0.37 mm/h. Surface water potential was maintained above - 0.04 MPa for 7 d, and 12% of ryegrass seeds established themselves on the bare soil surface. When the A horizon was wet to field capacity but no watertable was established, Ea was much less than Eo especially in periods of high evaporation. Also, the soil surface dried to below - 0.04 MPa within the first day and no seeds germinated. It appears that sowing on sites with temporary watertables could assist germination and establishment after aerial sowing.

Thermal Inertia Modeling for Soil Surface Water Content Estimation: A Laboratory Experiment

2012 ◽  
Vol 76 (1) ◽  
pp. 92-100 ◽  
Author(s):  
M. Minacapilli ◽  
C. Cammalleri ◽  
G. Ciraolo ◽  
F. D'Asaro ◽  
M. Iovino ◽  
...  
Keyword(s):  
Surface Water ◽  
Laboratory Experiment ◽  
Water Content ◽  
Thermal Inertia ◽  
Soil Surface

scholarly journals Effect of Digestate and Straw Combined Application on Maintaining Rice Production and Paddy Environment

2021 ◽  
Vol 18 (11) ◽  
pp. 5714
Author(s):  
Xue Hu ◽  
Hongyi Liu ◽  
Chengyu Xu ◽  
Xiaomin Huang ◽  
Min Jiang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Soil Organic Matter ◽  
Paddy Soil ◽  
Rice Yield ◽  
Soil Surface ◽  
Rice Production ◽  
Straw Decomposition ◽  
Rice Grains ◽  
Combined Application

Few studies have focused on the combined application of digestate and straw and its feasibility in rice production. Therefore, we conducted a two-year field experiment, including six treatments: without nutrients and straw (Control), digestate (D), digestate + fertilizer (DF), digestate + straw (DS), digestate + fertilizer + straw (DFS) and conventional fertilizer + straw (CS), to clarify the responses of rice growth and paddy soil nutrients to different straw and fertilizer combinations. Our results showed that digestate and straw combined application (i.e., treatment DFS) increased rice yield by 2.71 t ha−1 compared with the Control, and digestate combined with straw addition could distribute more nitrogen (N) to rice grains. Our results also showed that the straw decomposition rate at 0 cm depth under DS was 5% to 102% higher than that under CS. Activities of catalase, urease, sucrase and phosphatase at maturity under DS were all higher than that under both Control and CS. In addition, soil organic matter (SOM) and total nitrogen (TN) under DS and DFS were 20~26% and 11~12% higher than that under B and DF respectively, suggesting straw addition could benefit paddy soil quality. Moreover, coupling straw and digestate would contribute to decrease the N content in soil surface water. Overall, our results demonstrated that digestate and straw combined application could maintain rice production and have potential positive paddy environmental effects.

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