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首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Modeling Deficit Irrigation Water Productivity as Function of Crop Root Depth
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Modeling Deficit Irrigation Water Productivity as Function of Crop Root Depth

机译：根据作物根深度的功能建模缺陷灌溉水生产率

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Water scarcity is becoming a severe problem under arid and semi-arid regions. This water scarcity is due to increase in population growth and standards of living. These factors also affected negatively the availability of agricultural land and the reduction in water resources. Add to that the misunderstanding by the end users of the concept of soil-water-plant-atmosphere relationship. Therefore, it is a must to increase the water use efficiency and water productivity in agriculture, sjnce irrigationof crops consume more than 75% of the water resource in arid and semi-arid regions. In order to achieve the improvement of water use efficiency, and to meet the goal of high demand on food and fiber, it is important to model the relation between crop root distribution and extraction and evapotranspiration utilizing the weather data and the soil properties. The food and agriculture organization (FAO) had developed a computer model/ CropWat (FAO, 1998) to calculate crop evapotranspiration based on Penman-Monteith modified equation and crop factor. This model takes into consideration deficit irrigation in general, but did not consider the root distribution and the absorption of the water among each segment of the root depth. An experiment was carried on during the growing season of 2007 and 2008 on potato, and peppers, where the roots were partially filled to field capacity i.e. the roots depth was divided into four parts 25% each part. The water treatments were; fill the first quarter from the top to field capacity, fill the top 50% of the root to field capacity, fill the top 75% to field capacity and last treatment which the control fill the whole root zone to field capacity. Results indicates and will be presented that the 50% treatment gave significant and higher total yield and marketable yield than the other treatments for bothcrops. Also water saving was significantly higher in the 50% treatment, and so the water use efficiency and the water productivity.
机译：水资源短缺已成为下干旱和半干旱地区的严重问题。这种水资源短缺是由于人口增长和生活水平的提高。这些因素也造成负面影响的农业用地的供应和水资源的减少。再加上一点误解的土壤 - 水 - 植物 - 大气关系概念的最终用户。因此，增加对农业的水利用效率和水的生产率必须的，sjnce irrigationof作物消耗在干旱和半干旱地区的水资源的75％以上。为了实现水分利用效率的提高，并满足对食物和高纤维需求的目标，到作物根系分布和提取和利用气象资料蒸发蒸腾和土壤性质之间的关系模型是非常重要的。粮食和农业组织（FAO）开发了一个计算机模型/ CROPWAT（FAO，1998）根据彭曼 - 蒙特斯计算作物蒸散量修正公式和作物的因素。该模型考虑到一般考虑亏灌溉，但没有考虑根系分布和水的根深度的各段之间的吸收。进行实验期间2007和2008的马铃薯，辣椒和生长季节，其中所述根部分填充到田间持水量即根部深度分成四份25％的每个部分进行的。水治疗者;从顶部向田间持水量填充第一季度，填根田间持水量的顶部50％，填充所述顶部75％田间持水量和最后一次治疗，控制填充整个根区域田间持水量。结果表明，将提交该50％的处理，得到显著和较高的总产率和产量销售比其他治疗bothcrops。此外节水是在50％的治疗显著较高，所以水的利用效率和水的生产力。

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