Determination of optimum water for groundnut (Archies Hypogea) on the basis of crop coefficient in saline environment

• Published in: Journal of agrometeorology Vol. 19; no. 2; pp. 156 - 159
• Main Authors: Pandya, S M, Subbaiah, R
• Format: Journal Article
• Language: English
• Published: Anand Association of Agrometeorologist 01.06.2017; Association of agrometeorologists
• Subjects: Air temperature; Annual rainfall; Annual rainfall data; Arid regions; Barley; Crops; Evaporation; Evapotranspiration; Flowering; Flux density; Groundnuts; Heat flux; Heat transfer; Height; Irrigation; Loam; Loam soils; Mathematical analysis; Mathematical models; Moisture content; Moisture stress; Net radiation; Pan evaporation; Plant growth; Pressure; Pressure curve; Radiation; Radiation balance; Rain; Saline environments; Saline water; Salinity; Sandy loam; Sandy soils; Saturation; Sensors; Soil; Soil density; Soil heat flux; Soil moisture; Soil temperature; Studies; Subtropical climates; Surface temperature; Vapor pressure; Vapour pressure; Wind speed; Italy
• ISSN: 0972-1665; 2583-2980
• DOI: 10.54386/jam.v19i2.712

[...]an attempt has been made to determine the rate of ETc and Kc during flowering stage only. The climate of area is subtropical and semi-arid with an average annual rainfall of 900 mm and average annual pan evaporation of2044 mm. Soil type is sandy loam soil. The FAO Penman-Monteith method for calculating ETo can be expressed as (Allen et al.,1998): ET0 = (ProQuest: ... denotes formula omitted.) Where, ET0 is reference evapotranspiration (mm day-1), Rn is net radiation at the crop surface (MJm-2 day-1), G is soil heat flux density (MJm-2 day-1), T is mean daily air temperature at 2 m height (°C), u2 is wind speed at 2m height (ms-1), es is saturation vapour pressure (kPa), ea is actual vapour pressure (kPa), (es-ea) is saturation vapour pressure deficit (kPa), Д is slope vapour pressure curve (kPa °C-1) and у is Psychometric constant (kPa°C-1). The evapotranspiration of the crop during the whole season using Penman approach with the modified crop coefficient for non- moisture stress (Ks=1) and non-saline conditions was estimated to be 413.8 mm. The Kc developed based on daily fluctuation of soil moisture with moisture probes can be expressed with a polynomial equation of 3rd or 4th order for different treatments.