Estimation of evapotranspiration using a simulation model

Ali, Mohammed Hasan; Paul, Huibert; Haque, M. R.

doi:10.3329/jbau.v9i2.11038

Cited by 11 publications

(11 citation statements)

References 8 publications

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“…Irrigation scheduling determines the agronomic and economic benefits of farms. Hence, irrigation scheduling is important for developing best management practices for irrigated areas (Ali et al, 2011). The irrigation water is applied to the cultivation according to predetermined schedules based upon the monitoring of the soil water status and the crop water requirements.…”

Section: Introductionmentioning

confidence: 99%

Optimal Irrigation Scheduling for Pepper (Capsicum annuum L.) at Gidara Condition, Central Rift Valley of Ethiopia

2022

JEES

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The wise use of irrigation water relies on understanding the exact crop water demand and its application which help to boost agricultural water productivity. Proper irrigation scheduling comprises crop water demand and the rifling frequency of the required water amount. Therefore, this activity was aimed at determining the optimal irrigation regime for pepper. The trial was carried out during 2016 and 2017 to determine the optimal irrigation regime of Pepper (Mareko Fana variety) at Gidara trial site of Melkassa Agricultural Research under five soil moisture depletion levels at which the next irrigation is given: 60% ASMDL, 80% ASMDL, 100% ASMDL, 120% ASMDL and 140% ASMDL). The allowable soil moisture depletion level (100% ASMDL) was scheduled to be refilled when 30% of the total available soil moisture was depleted. The result revealed that there was significant difference in plant height, yield and water productivity among treatments at 5% level of significance. The maximum yield and water productivity were observed in 60% ASMDL treatment. Using depletion levels of 60% and 80% of the recommended soil moisture depletion levels has increased the water productivity significantly. Hence, as much as the total water to be applied throughout the growth period is similar it is better to irrigate pepper frequently with smaller amount.

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Section: Introductionmentioning

confidence: 99%

Optimal Irrigation Scheduling for Pepper (Capsicum annuum L.) at Gidara Condition, Central Rift Valley of Ethiopia

2022

JEES

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“…Ethiopia is a country, with land coverage of 1.13 Million km 2 , found in Eastern part of Africa [3]. The country is geographically located in between the latitudes 5°N and 15°N, and longitudes 35°E and 45°E [15].…”

Section: Introductionmentioning

confidence: 99%

“…Irrigation is defined as the application of suitable water to crops in appropriate amount at the right time [8]. Irrigation scheduling is required for developing best irrigation water management practices for irrigated areas [2].…”

Section: Introductionmentioning

confidence: 99%

Indigenous Knowledge Assessment on Irrigation Water Management Practices

Temam¹,

Abebe²

2022

AJMSE

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Indigenous knowledge is the local or traditional knowledge system used by farmers. Therefore indigenous knowledge on irrigation water management means using of local or traditional knowledge system to manage irrigation water. This study was aimed to investigate farmers' current irrigation water management practice and their technical performance. In this study I used reconnaissance survey and observation were carried out with each implementing center and Woreda Bureau of Agriculture to obtain overview of different irrigation schemes and irrigation practice conditions. The collected qualitative and quantitative data both from primary and secondary sources were analyzed using appropriated statistical methods like SPSS. The study result showed that farmers have developed several indigenous knowledge of irrigation water management practices. Among these knowledge, most of farmers in both weredas use furrow irrigation method, farmers use soil moisture method and crop leaf wilt techniques to irrigate cropped land, Most farmers apply irrigation water at morning and night time, The respondents uses watering top ridge to determine irrigation water sufficient and watering bottom ridge and slow stream flow for irrigation water insufficient.

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“…Irrigation implies the application of suitable water to crops in the right amount at the right time [11] Irrigation scheduling is important for developing best management practices for irrigated areas [5]. There is considerable scope for improving water use efficiency of these crops by proper irrigation scheduling governed by crop evapotranspiration [12,5] have suggested that the crop coefficient values need to be derived empirically for each crop based on lysimetric data and local climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Models Comparative Study for Estimating Crop Water Requirement and Irrigation Scheduling of Maize in Metekel Zone, Benishangul Gumuz Regional State, Ethiopia

Tefera¹,

Mitiku²

2021

IJAE

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This study was aimed to compare estimation methods of crop water requirement and irrigation scheduling for major crops using different models and compare the significance of models for adoption in different situations of the Metekel zone. Crop water requirement and irrigation scheduling of maize in selected districts of Metekel zone were estimated using CropWat model based on soil, crop and meteorological data, and AquaCrop based on soil, crop and meteorological data including Co 2 , groundwater, field management, and fertility status. Model performance was evaluated using Normalized Root mean square errors (NRMSE), model by Nash-Sutcliffe efficiency (NSE), Prediction error (Pe), and Model efficiency (MF). It is observed that the maximum reference evapotranspiration in the study area was found to be 7.1 mm/day in Guba and the minimum reference evapotranspiration was 2.9 mm/day in Bullen district. In all cases, the maximum ETo in all districts was fund to in March and the lowest in August. The maximum ETc of maize was found to be 702.4mm in Guba district and the minimum ETc was found to be 572.6mm in Bullen district using CropWat but the effective rainfall (Pe) for maize was determined as 185mm respectively in Wembera district. However, using the AquaCrop model the maximum ETc of 565 mm was recorded in Guba but 425 mm was recorded as a minimum in the Wembera district for irrigated maize in the study area. The study revealed that the irrigation scheduling with a fixed interval criterion for maize 10 days with 12 irrigation events has been determined. Moreover, furrow irrigation with 60% irrigation application efficiency was adjusted during irrigation water applications for all districts. The performance of the irrigation schedule and crop response was evaluated by the analysis results in the simulation using different models. It has been observed that there were a strong relationship and a significant relation between the simulated and observed values for validation. Hence, Normalized Root mean square errors (NRMSE), model by Nash-Sutcliffe efficiency (NSE), Prediction error (Pe), and Model efficiency (MF) showed that the AquaCrop model well simulated in all parameters considered. AquaCrop model is the most suitable soil-water-crop-environment management model, so future studies should suggest a focus on addressing deficit irrigation strategy with different field management conditions to improve agricultural water productivity under irrigated agriculture for the study area for major crops.

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Estimation of evapotranspiration using a simulation model

Cited by 11 publications

References 8 publications

Optimal Irrigation Scheduling for Pepper (Capsicum annuum L.) at Gidara Condition, Central Rift Valley of Ethiopia

Optimal Irrigation Scheduling for Pepper (Capsicum annuum L.) at Gidara Condition, Central Rift Valley of Ethiopia

Indigenous Knowledge Assessment on Irrigation Water Management Practices

Models Comparative Study for Estimating Crop Water Requirement and Irrigation Scheduling of Maize in Metekel Zone, Benishangul Gumuz Regional State, Ethiopia

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