TY  - JOUR
T1  - Determination of Crop Water Requirement for Rice: A Case Study in the Long Xuyen
Quadrangle, Vietnam
AU - An Dang, Truong 
JO  - Research Journal of Applied Sciences
VL  - 14
IS  - 11
SP  - 396
EP  - 404
PY  - 2019
DA  - 2001/08/19
SN  - 1815-932x
DO  - rjasci.2019.396.404
UR  - https://makhillpublications.co/view-article.php?doi=rjasci.2019.396.404
KW  - crop water requirement
KW  -Cropwat
KW  -effective rainfall
KW  -irrigation
KW  -climate change
AB  - This study is focused on water use aspects with
the aim of: calculating reference and actual evapo
transpiration; determining Crop Water Requirement
(CWR) and Crop Irrigation Requirement (CIR) and
constructing Efficient Irrigation Schedule (EIS) for three
main crops, including winter-spring, summer-autumn
and autumn-winter using the Cropwat model based on
monthly meteorological data recorded from 1984-2015.
The results showed that winter-spring and summerautumn
harvest needed irrigation water approximately
8186 and 5830 m<sup>3</sup> ha<sup>&#150;1</sup> while autumn-winter harvest
needed approximately 2204 m<sup>3</sup> ha<sup>&#150;1</sup>. The lowest value of
the reference Evapotranspiration (ET<sub>C</sub>) is approximately
607.8 mm crop occurred autumn-winter crop while the
highest value 709.9 mm crop occurred summer-autumn
crop. The highest IR of the winter-spring, summerautumn
crops occurred on development stage with
net irrigation approximately 499.5 and 397.1 mm,
respectively. While the autumn-winter crop occurred on
both growth, development and late stage with average net
irrigation approximately 307 mm. The results obtained
confirm that the Cropwat model with meteorological and
soil data as input variables is successfully applied to
define actual Evapotranspiration (ET<sub>&#176;</sub>), ET<sub>C</sub>, CWR and
EIS for three major crop seasons of rice in LXQ areas,
vietnam with reasonable accuracy.
ER  -