Volume 9, No. 4, 2020

Determination of Crop Coefficients and Water Requirement of Tomato at Werer, Middle Awash Valley of Ethiopia
Nigusie Abebe and Elias Kebede
Int J Agri Biosci, 2020, 9(3): 152-155.
Abstract
Abstract

Determination of crop coefficients at different growth stages is important for estimating irrigation water requirements in order to have better irrigation scheduling and water management. A field experiment was conducted during cool cropping season started from November and during main cropping season started from June for two consecutive years from 2012/13 – 2013/14 to determine the water requirement and establish the crop coefficient (Kc) values for tomato by using lysimeter. Three non-weighing type lysimeter with the dimension of 2m × 2m area and 3m depth were used to determine the daily ETc of tomato crop. Tomato crop coefficient was estimated at different growth stage based on lysimeter measured ETc from components of water balance and reference evapotranspiration obtained from long term metrological data. The obtained Kc values for cool season planted tomato were 0.63, 0.84, 1.15 and 0.84 in the initial, crop development, mid season and late-season stages, respectively. Meanwhile, the corresponding Kc values for main season planted tomato were 0.64, 0.97, 1.22, and 0.89 in the four stages, respectively. The seasonal crop evapotranspiration was 552mm and 584mm during cool and main cropping season respectively. The water requirement and crop coefficient values determined in this study can be useful for agricultural planning and efficient management of irrigation water for cultivation of tomato in semi-arid climate.

Keywords: Crop coefficient, Crop evapotranspiration, Water balance, Lysimeter, Tomato.

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Effect of Mulching Materials and Furrow Irrigation Techniques on Yield, Water Productivity and Economic Return of Maize (Zea mays L.) at Werer, Middle Awash Valley, Ethiopia
Nigusie Abebe, Yibekal Alemayehu and Fentaw Abegaz
Int J Agri Biosci, 2020, 9(3): 156-162.
Abstract
Abstract

The climate change, water shortage and increasing evapotranspiration highlights the need to introduce water saving technologies for agricultural sustainability and crop production with a minimum input of water, mainly in semi-arid region. This experiment was conducted at Werer, Middle Awash Valley during the dry season of 2017/2018 to investigate the effects of mulching materials and furrow irrigation techniques on maize yield and water productivity under semiarid conditions. Split plot design with three replications, in which the irrigation techniques (Conventional, Fixed and Alternate Furrow) were assigned to main plot and the three mulching materials (no mulch, wheat straw and white plastic mulch), were to the sub-plot. Results indicate that both grain yield and water productivity were affected by the main effect of furrow irrigation techniques and mulching materials (p≤ 0.05). The conventional furrow irrigation (8193 kgha-1) and white plastic mulch (7930 kg ha-1) resulted in the maximum grain yield. The alternate furrow irrigation (1.90 kg/m3) and the white plastic mulch (1.69 kg/m3) resulted in the maximum water productivity. The highest benefit-cost ratio of (1.20) and net return of (49108 ETBha-1) were obtained from conventional furrow irrigation. Similarly, the highest net return of (53028 ETBha-1) and benefit-cost ratio of (2.16) was recorded from no mulch. Under limiting irrigation water adopting alternate furrow irrigation along with wheat straw mulch can minimize evaporation loss, maximize water productivity, and economically feasible for maize production.

Keywords: Deficit irrigation, Evapotranspiration, Water use efficiency, Yield.

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