Rapid socio-economic changes in China,such as land conversion and urbanization,are creating new scopes for the application of precision agriculture(PA).An experiment to assess the economic benefits of two precision ag...Rapid socio-economic changes in China,such as land conversion and urbanization,are creating new scopes for the application of precision agriculture(PA).An experiment to assess the economic benefits of two precision agriculture methods was applied for one year–precision seeding and precision seeding with land leveling.Whilst the results for this were positive,of itself it did not provide evidence of longer terms gains.The costs of land leveling are accrued in a single year but the benefits could carry over into subsequent years.Thus,in this case if the PA method provides carry over benefits to future years,the economic assessment would incorrectly assign all the costs to a single year of benefits i.e.the benefit-cost ratio would be underestimated.To gauge whether there was carry over benefits in future years we looked at NDVI and GUI as proxies for future year benefits.For the single year experiment,our results showed that:(1)Winter wheat yield was increased 23.2%through the integration of precision seeding and laser leveling technologies.(2)Both the single technology and the integrated technologies significant reduced the concentration of soil ammonium nitrogen at the depths of 60 cm;(3)The benefit/cost ratio's of the treatments exceeded that of the baseline by approximately 10%which translated to an increase of several hundred US$per hectare.The NDVI analysis showed that the effect of laser land leveling could last to the next two years.When considering the multi-year impact of land leveling,the benefit/cost ratio of PSLL will increase to 23.5%and 22.9%with and without laser land leveling subsidies.Making clear the eco-nomic benefits of using PA technologies will likely promote application of the technologies in the region.展开更多
该文基于模糊控制理论,研制开发了一套与中国常用中等功率拖拉机匹配、面向旱田土地精细平整作业、具有自主知识产权、价格低廉、性能优良的激光平地机的控制系统。试验结果表明:研制的液压控制装置具有良好的静动态特性,泵的卸荷压力为...该文基于模糊控制理论,研制开发了一套与中国常用中等功率拖拉机匹配、面向旱田土地精细平整作业、具有自主知识产权、价格低廉、性能优良的激光平地机的控制系统。试验结果表明:研制的液压控制装置具有良好的静动态特性,泵的卸荷压力为0.4M Pa,平地铲提升时的滞后时间为80 m s,下降时的滞后时间为44 m s,并且无静沉降;激光控制平地系统的平整精度可达到2.5 cm,作业效率0.81 hm2/h。展开更多
基金funded by the National Key Research and Development Program of China(2017YFE0122500).
文摘Rapid socio-economic changes in China,such as land conversion and urbanization,are creating new scopes for the application of precision agriculture(PA).An experiment to assess the economic benefits of two precision agriculture methods was applied for one year–precision seeding and precision seeding with land leveling.Whilst the results for this were positive,of itself it did not provide evidence of longer terms gains.The costs of land leveling are accrued in a single year but the benefits could carry over into subsequent years.Thus,in this case if the PA method provides carry over benefits to future years,the economic assessment would incorrectly assign all the costs to a single year of benefits i.e.the benefit-cost ratio would be underestimated.To gauge whether there was carry over benefits in future years we looked at NDVI and GUI as proxies for future year benefits.For the single year experiment,our results showed that:(1)Winter wheat yield was increased 23.2%through the integration of precision seeding and laser leveling technologies.(2)Both the single technology and the integrated technologies significant reduced the concentration of soil ammonium nitrogen at the depths of 60 cm;(3)The benefit/cost ratio's of the treatments exceeded that of the baseline by approximately 10%which translated to an increase of several hundred US$per hectare.The NDVI analysis showed that the effect of laser land leveling could last to the next two years.When considering the multi-year impact of land leveling,the benefit/cost ratio of PSLL will increase to 23.5%and 22.9%with and without laser land leveling subsidies.Making clear the eco-nomic benefits of using PA technologies will likely promote application of the technologies in the region.
文摘该文基于模糊控制理论,研制开发了一套与中国常用中等功率拖拉机匹配、面向旱田土地精细平整作业、具有自主知识产权、价格低廉、性能优良的激光平地机的控制系统。试验结果表明:研制的液压控制装置具有良好的静动态特性,泵的卸荷压力为0.4M Pa,平地铲提升时的滞后时间为80 m s,下降时的滞后时间为44 m s,并且无静沉降;激光控制平地系统的平整精度可达到2.5 cm,作业效率0.81 hm2/h。
