|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5758331||1622892||2017||11 صفحه PDF||سفارش دهید||دانلود رایگان|
- Sustainable water development can be enhanced by using predefined water application depths.
- Water depths of 4 and 5Â cm offer an opportunity to conserve water without significant impact on corn grain yield.
- Water wasted in surface irrigated corn can be mitigated by employing a rooting depth of 60Â cm.
The enhancement of common irrigation practices can substantially contribute to sustainable water development. This study was conducted to determine an effective water application depth for improving agricultural water use (irrigation water use efficiency (IWUE) and water use efficiency (WUE)) in surface irrigated corn production, and to determine an effective rooting depth for irrigation planning in a tropical region. The effect of five irrigation treatments on corn growth, yield and root extraction patterns were investigated and assessed. The treatments included a full irrigation treatment with a water application depth of 6Â cm (T5), and four deficit irrigation (DI) treatments with depths of: 5Â cm (T4), 4Â cm (T3), 3Â cm (T2) and 2Â cm (T1). Irrigation water was applied to all treatments when soil moisture for T5 was depleted by 40%. Seasonal water applied varied from 235 to 555Â mm while the seasonal crop evapotranspiration ranged from 331 to 605Â mm. Results revealed all treatments sustained varying levels of water stress except for T5. Corn grain yield ranged from 567.13Â gÂ mâ2 in T1 to 911.26Â gÂ mâ2 in T5, a significant increase (PÂ <Â 0.05) of 37.7%. Similarly, there were significant differences in biomass ranging from 1012.64 to 1774.05Â gÂ mâ2 and leaf area index ranging from 3.99 to 5.83Â m2Â mâ2. The highest WUE of 1.79Â kgÂ mâ3 and IWUE of 2.41Â kgÂ mâ3 were observed for T3 and T5, respectively, whereas the lowest was found in T5 with respective values of 1.52 and 1.63Â kgÂ mâ3. Results indicate that it is possible to implement DI strategies for reducing agricultural water use without significant impact on grain yield. Treatments T3 and T4 offer water savings of 29% and 14% respectively in irrigation application with a 10.5% and 8.6% insignificant reduction in grain yield relative to T5. Further, agricultural water productivity can be enhanced by employing a rooting depth of 60Â cm when planning irrigation application amount.
Journal: Agricultural Water Management - Volume 188, 1 July 2017, Pages 115-125