• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Agricultural Water Management >Economic comparisons of variable rate irrigation and fertigation with fixed (uniform) rate irrigation and fertigation and pre-plant fertilizer management for maize in three soils
【24h】

Economic comparisons of variable rate irrigation and fertigation with fixed (uniform) rate irrigation and fertigation and pre-plant fertilizer management for maize in three soils

机译：三种土壤中固定（均匀）灌溉和灌溉灌溉灌溉灌溉灌溉灌溉及灌溉灌溉灌溉灌溉施肥和植物前肥料灌溉施肥及肥大

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Extensive field research for data collection to conduct economic comparisons of variable rate irrigation (VRI) with fixed (uniform) rate irrigation (FRI) and no irrigation (NI) in combination with three nitrogen application strategies of fixed (uniform) rate fertigation (FRF), variable rate fertigation (VRF) and pre-plant nitrogen (PP) management for maize (Zea mays L.) were conducted. Research was conducted in three soil types [(i) Crete silt loam (S1); (ii) Hastings silty clay loam (S2); and (iii) Hastings silt loam (S3)] for three growing seasons (2015, 2016 and 2017) in Nebraska, USA. For the economic analyses, the average initial investment of the irrigation system and necessary VRI technology, salvage value of the system, total capital investment, total fixed cost, net present value (NPV) and internal rate of return (IRR) were quantified by considering numerous factors/variables, including interest rate, production input cost, longevity of the system, insurance cost, ownership cost and salvage value. Soil types and irrigation management strategies (treatments) had significant impact on grain yield and thus on profitability, NPV, IRR and irrigation system payback period. Net income from FRI management was significantly higher than VRI management in all soil types. The nitrogen treatments did not affect net income in any of the growing seasons. The FRI management strategy had a positive NPV in all soil types whereas VRI management in S2 and S3 had negative NPVs. The negative NPV indicates that the present value of the costs exceeds the present value of future profits at the assumed discount rate (5%). Averaging all three years and three soils, FRI had a substantially higher net income than VRI in most cases. The maximum NPV of $4,882.07 per ha and maximum IRR of 18 % was observed in FRI-FRF treatment. A payback period of <= 10 years was determined for all FRI management treatments while the payback period for VRI management, in most cases, was more than 27 years. While the pay-back period in VRI irrigation system was less than ten years in 51, it was still longer than the corresponding FRI management treatments. Results suggest that the VRI and VRF strategies are not economically feasible in current conditions. For these variable irrigation and fertilizer technologies to be competitive with the FRI and FRF, the cost of the VRI and VRF technology will need to be significantly lower than the current investment costs. While there could be some environmental benefits of VRI and VRF technology, with the current high investment cost of VRI technology and the fact that the grain yields are not improved sufficiently to offset the investment cost, it is not possible for VRI technology to be an economically viable technology for profitable economic net return. This may explain, in part, extremely limited adoption of these technologies by producers currently in large scale production fields.
机译：对数据收集进行广泛的现场研究，以固定（均匀）速率灌溉（FRI）与固定（均匀）灌水（FRI）的可变速率灌溉（VRI）进行经济比较，与固定（均匀）速率灌溉的三种氮应用策略（FRF）结合灌溉（NI）进行了玉米（Zea Mays L.）的可变速率灌溉（VRF）和植物前氮（PP）管理。研究采用三种土壤类型[（i）克里特岛淤泥壤土（S1）; （ii）黑斯廷斯粉质粘土壤土（S2）; （iii）Hastings Silt Loam（S3）]对于美国内布拉斯加州的三个生长季节（2015,2016和2017）。对于经济分析，灌溉系统的平均初始投资和必要的VRI技术，制度的救助价值，总资本投资，总固定成本，净目前（NPV）和内部回报率（IRR）通过考虑来量化众多因​​素/变量，包括利率，生产投入成本，系统长寿，保险成本，所有权成本和挽救价值。土壤类型和灌溉管理策略（治疗）对粮食产量产生重大影响，从而对盈利能力，NPV，IRR和灌溉制度投资回收期。 FRI管理的净收入明显高于所有土壤类型的VRI管理。氮气治疗在任何不断增长的季节都不会影响净收入。 FRI管理策略在所有土壤类型中具有阳性NPV，而S2和S3中的VRI管理具有负NPV。负值的NPV表示，本费率的现值超过了假设的贴现率（5％）的未来利润的现值。在大多数情况下，平均所有三年和三个土壤，FRI比VRI在大大提高的净收入。在FRI-FRF处理中观察到每公顷4,882.07美元的最大NPV和18％的最大IRR。在所有FRI管理治疗中确定了<= 10年的回收期，而VRI管理的投资回收期在大多数情况下超过27年。虽然VRI灌溉系统中的薪酬期限在51年不到十年，但它仍比相应的FRI管理治疗更长。结果表明，VRI和VRF策略在当前条件下在经济上不可行。对于这些可变灌溉和肥料技术与FRI和FRF具有竞争力，VRI和VRF技术的成本将需要明显低于当前的投资成本。虽然VRI和VRF技术可能存在一些环境效益，但目前VRI技术的高投资成本以及粮食产量并不充分提高以抵消投资成本，VRI技术不可能成为经济可行的经济净回报可行技术。这可以部分解释，部分地通过当前在大规模生产领域的生产者提供了这些技术的通过。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号