Estimate soil moisture

This study focuses on monitoring the variation of surface soil moisture (0- 1 cm) and ground soil moisture (0÷1 m) in the soil in Dak Nong province using Sentinel-1 radar images received in December 2017. Active radar signals utilized in this method were sent and received using short wave pulses. The intensity of the received signal is compared to determine the scattering coefficient of the surface.

8p viwolverine 07-07-2023 5 3   Download

The soil cohesion and angle of internal friction depend greatly on the soil moisture. Specifically, soil with a lower moisture content has a higher shearing strength than that in soil with higher moisture content. The finite element modeling of moisture transfers in unsaturated soils through the relationship between soil moisture, soil suction, unsaturated permeability and soilmoisture dispersivity is capable of accurately predicting the wetting front development.

13p nguaconbaynhay11 07-04-2021 24 1   Download

Stress is any environmental condition that prevents the plant from achieving its full genetic potential and negative impact of non-living factors on living organisms in a specific environment is known as abiotic stress. Abiotic stresses are serious threats to agriculture and the environment which have been exacerbated in the current century by global warming and industrialization. Abiotic stress cause changes in soil–plant–atmosphere continuum which is responsible for reduced yield in several of the major crops in different parts of the world.

27p chauchaungayxua6 26-06-2020 17 0   Download

Groundwater is one of the most valuable natural resources, which supports human health, economic development and ecological diversity. The amount of water that will ultimately arrive at the water table is defined as natural ground water recharge. The amount of this recharge depends upon the rate and duration of rainfall, the subsequent conditions at the upper boundary, the antecedent soil moisture conditions, the water table depth and the soil type.

8p chauchaungayxua5 08-05-2020 12 1   Download

Performance evaluation of surface irrigation method was carried out for cotton and wheat fields in village Kirarkot (Sirsa). Water application, storage and distribution efficiency were estimated using measurements of soil moisture, infiltration characteristics, water advance and recession time during different irrigation events. Applied depth of irrigation was estimated based on infiltration opportunity time at different points in the selected border strips.

13p angicungduoc4 26-04-2020 21 1   Download

SOC plays key role in mitigating global climate change and improves land productivity through improved soil properties such as nutrient supply and moisture retention. Studying carbon pools under existing land uses provides baseline data to project C sequestration over time. The present investigation was undertaken to estimate the SOC stock in two dominant soil series under different land uses of North-Eastern Agro-climatic zone of Tamil Nadu. Land uses selected for the study were Forests, Agriculture, Agro-forestry and Plantations.

9p nguathienthan3 27-02-2020 19 0   Download

The study was carried out at university Research Farm, Tamil Nadu Veterinary and Animal Sciences University, under light textured soils. The treatments consisted of three irrigation levels viz., I1: drip irrigation at 100% Potential Evapo transpiration (PE), I2: drip irrigation at 75% PE and I3: surface irrigation, and three nutrient levels viz., F1: Farm Yard Manure (FYM) 25 t ha-1 + 50% recommended dose of fertilizers (RDF), F2: FYM 25t ha-1 + 100% RDF and F3:100% RDF. Cumulative irrigation water was calculated and applied as per the treatment schedule.

9p chauchaungayxua3 07-02-2020 12 0   Download

In order to give precise amount of irrigation through drip irrigation system, it is important to estimate the reference evapotranspiration (ETo) and crop evapotranspiration (ETc) for any crops. In this study, crop evapotranspiration (ETc) was determined for the Green chilli cultivated in the polyhouse and open field for the semi-arid climatic condition in Kumulur, Tamil Nadu, as it changes with the crop characteristics, climatic conditions and management practices. The chilli variety chosen was TNAU Hybrid CO1.

7p nguathienthan2 19-12-2019 12 0   Download

Agricultural sustainability is the highest priority in developed and developing countries. This study aims in discussing the impacts and applications of geospatial information technology in agriculture and allied branches. These advanced technologies offer multi-scale benefits and they can be used to create and synthesize new low-cost information and documents.

9p kequaidan2 11-12-2019 17 0   Download

Remote sensing has several advantages in the field of agronomical research purpose. The assessment of agricultural crop canopies has provided valuable insights in the agronomic parameters. Remote sensing play a significant role in crop classification, crop monitoring and yield assessment. The use of remote sensing is necessary in the field of agronomical research purpose because they are highly vulnerable to variation in soil, climate and other physico- chemical changes.

14p nguaconbaynhay1 04-12-2019 27 2   Download

The radiometers, which are used for soil moisture measurement, worked well during the experimental campaign and produced volumetric soil moisture estimates that compared well with the ground-truth measurements. Explanations for the observed discrepancies are presented. The experimental results showed that the model of Choudhury et al. for surface roughness correction provides a better fit to radiometric data over the angular range between 20 ˚ and 50 ˚ for n = 0 (i.e., the cos2θ factor in the exponential in (15) is suppressed).

8p thuyliebe 09-10-2018 20 0   Download

The genesis of this book began on the sunny shores of southern France in September 1993. For five days in the delightful Mediterranean coastal town of La Londe Les Maures, a gathering occurred of a group of scientists interested in furthering both the understanding and use of thermal infrared (TIR) remote sensing data for analysis of land surface processes.

439p 951628473 07-05-2012 126 18   Download

Designing water harvesting systems Introduction The water shortage in the cultivated area is supplemented by water from the catchment area (Figure 2). When designing a water harvesting system the size of the catchment area is calculated or estimated, in order to ensure that enough runoff water

20p summerflora 23-10-2010 79 3   Download