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Articles by Truong An Dang
Total Records ( 3 ) for Truong An Dang
  Seung Kyu Lee and Truong An Dang
  Background and Objective: Binh Thuan Province is one of the large cassava cultivation areas in Vietnam. However, in recent years the cassava crops are facing the increased risks of irrigation water shortage due to drought and abnormal change of rainfall under the impacts of climate variability (ICV), leading to reduce crop yield. The study was, therefore, conducted to define a suitable period for planting cassava crops in Binh Thuan Province, Vietnam to reduce the negative impacts of weather factors. Materials and Methods: The study was conducted using the AquaCrop model to predict the cassava yield corresponding to different crop calendars to define the suitable planting period. The model performance was appraised through the calibration and validation process with the index of agreement (d), correlation coefficient (r) up to 0.80 and RMSE lower than 0.40. Results: The results carry out that the cassava yield can be reached 48.18 t ha1 if the crop calendar (CC) is early shifted from 14-21 days compared with the current crop calendar (CCC) for spring crop while an increase of approximately 5.16% can be achieved if the CC is delayed from 7-14 days for summer crop season. The results stated that the proposed model is suitable for defining the CC based on its simulated biomass and cassava yield. Conclusion: The study indicated that rainfall plays an important role in the planting calendar of cassava crops. Through, it is also confirmed that planting calendars of cassava crops is not appropriate for current weather conditions.
  Truong An Dang
  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 m3 ha–1 while autumn-winter harvest needed approximately 2204 m3 ha–1. The lowest value of the reference Evapotranspiration (ETC) 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°), ETC, CWR and EIS for three major crop seasons of rice in LXQ areas, vietnam with reasonable accuracy.
  Truong An Dang and Van Hao Lam
  The study area is one of the important agricultural areas in the Mekong Delta of Vietnam. It has an important contribution in term of food security and economic development in Vietnam. In recent years, this area has seriously impacted by salinization, drought due to the impact of climate change leading to the irrigation water scarce for agricultural production. Therefore, the accurate estimation of irrigation water requirements is very necessary and especially in the context of the climate variability. The aim of this study was to define irrigation water requirement, net irrigation requirements and to conduct efficient irrigation schedule for improved irrigation practices order to provide information necessary in taking decisions on irrigation management under the impacts of climate change. This study is conducted applying the CORPWAT crop model based on meteorological factors recorded from 2004-2015. The simulated results showed that the crop water demand of the Winter-Spring, Summer-Autumn and crop water demand cropsvarying from 0.0-176.8 mm/dec. The high crop water demand was recorded in the Winter-Spring, Summer-Autumn crops (from 593.4-827.8 mm) and lower was observed in the Autumn-Winter crop (236.3 mm). The highest Crop Water Demand (CWD) values of Winter-Spring, Summer-Autumn crop was occurred from the mid-second decade to the end of the third decade and the lowest CWD value was close to zero on the four decades to the mid-sixth decade of the Autumn-Winter crop.The simulation results showed that CORPWAT crop model can be successfully applied to define reference Evapotranspiration (ET ), actual Evapotranspiration (ET ), Effective Rainfall (ER), CWD and irrigation o C conditions with reasonable accuracy.
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