一、引言
随着计算机嵌入式系统和DSP（digital signal process数字信号处理）技术的发展，PDA产品已经从最初的个人资料存储、管理发展到目前的具有能够实现资料同步、GPS、E—mail等多种功能的产品。近年来，PDA技术逐步在农业和环...一、引言
随着计算机嵌入式系统和DSP（digital signal process数字信号处理）技术的发展，PDA产品已经从最初的个人资料存储、管理发展到目前的具有能够实现资料同步、GPS、E—mail等多种功能的产品。近年来，PDA技术逐步在农业和环境保护等领域中应用，取得了显著成就。鉴于嵌入式设备的诸多优点，同时考虑到草坪、树木灌溉现场指导的切实需求，本文介绍了PDA技术在灌溉管理系统中的应用。展开更多
Water balance and migration characteristics are vital to the establishment of an efficient irrigation management system. Based on the observed data including microclimate and growing parameters of maize from 2009 to 2...Water balance and migration characteristics are vital to the establishment of an efficient irrigation management system. Based on the observed data including microclimate and growing parameters of maize from 2009 to 2012, actual evapotranspiration during the growth period was estimated by a combination of the FAO-56 crop coefficient approach and the Penman–Monteith model; the changes in soil water storage were estimated through the monitored water content at different depths from 0 to 3 m;the water content monitoring zone was divided into three sub-zones according to the water-balance characteristics of different soil layers and water monitoring data. On these bases, in combination of water-balance model, three aspects were analyzed: water-balance characteristics at different growth stages; water-balance characteristics in the three different sub-zones; and water-migration characteristics of ten sunny days following irrigation. These analyses revealed severe deep leakage under present irrigation management, which could be remedied by limiting onetime irrigation practices and increasing irrigation frequency. Additionally, some practical suggestions are provided for different growing stages.展开更多
文摘一、引言
随着计算机嵌入式系统和DSP（digital signal process数字信号处理）技术的发展，PDA产品已经从最初的个人资料存储、管理发展到目前的具有能够实现资料同步、GPS、E—mail等多种功能的产品。近年来，PDA技术逐步在农业和环境保护等领域中应用，取得了显著成就。鉴于嵌入式设备的诸多优点，同时考虑到草坪、树木灌溉现场指导的切实需求，本文介绍了PDA技术在灌溉管理系统中的应用。
基金supported by theNational Science Fund for Distinguished Young Scholars of China(41125002)the National Natural Science Foundation of China(41271036)
文摘Water balance and migration characteristics are vital to the establishment of an efficient irrigation management system. Based on the observed data including microclimate and growing parameters of maize from 2009 to 2012, actual evapotranspiration during the growth period was estimated by a combination of the FAO-56 crop coefficient approach and the Penman–Monteith model; the changes in soil water storage were estimated through the monitored water content at different depths from 0 to 3 m;the water content monitoring zone was divided into three sub-zones according to the water-balance characteristics of different soil layers and water monitoring data. On these bases, in combination of water-balance model, three aspects were analyzed: water-balance characteristics at different growth stages; water-balance characteristics in the three different sub-zones; and water-migration characteristics of ten sunny days following irrigation. These analyses revealed severe deep leakage under present irrigation management, which could be remedied by limiting onetime irrigation practices and increasing irrigation frequency. Additionally, some practical suggestions are provided for different growing stages.
