Irrigazione di mais da granella a rateo variabile mediante mappe indice di stress idrico da acquisizione SPOT HRG

Translated title of the contribution: [Autom. eng. transl.] Variable rate grain maize irrigation using water stress index maps from SPOT HRG acquisition

Massimo Vincini, Ermes Frazzi, Ferdinando Calegari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An open field Variable Rate Irrigation (VRI) experiment was a carried out on corn at the Vittorio Tadini experimental farm (Piacenza, Italy) on 2008. An Available Water Capacity (AWC) map of the experimental field was estimated using geo-referred measures of soil texture and water potential and using a MSI (Moisture Stress Index) map obtained from a SPOT HRG corn reflectance data collected on 2005 over the same field. Two irrigation water balances, based on standard local crop water requirements for each crop stage and rainfall, were calculated during the growing season for the two estimated extreme AWC values in the field. Variable rate irrigation prescription maps, aimed to maintain a minimum of 20% of AWC and to avoid to exceed the Field Capacity (FC) for each location in the field, were calculated by spatial linear interpolation based on the estimated AWC map of the two irrigation rates assigned for each irrigation turn to maximum and minimum AWC locations. Irrigation turns were set according to estimated minimum AWC depletion (i.e. aimed to maintain a minimum of 20% of AWC in locations with smallest AWC. VRI was carried out in part of the field by GPS-driven traveling sprinkler varying travel speed and gun angular speed to achieve desired rate within management zones, whereas in the other part of the field irrigation was carried out with constant rates corresponding to the spatial average of the VRI area (i.e. the same amounts of water were given to VRI and test –constant rate– areas in each irrigation turn). Grain production of VRI-irrigated corn outperformed that of test area by 20%.
Translated title of the contribution[Autom. eng. transl.] Variable rate grain maize irrigation using water stress index maps from SPOT HRG acquisition
Original languageItalian
Title of host publicationAtti 15° Conferenza Nazionale ASITA
Pages2113-2118
Number of pages6
Publication statusPublished - 2011
Event15° Conferenza Nazionale ASITA - Colorno
Duration: 15 Nov 201118 Nov 2011

Conference

Conference15° Conferenza Nazionale ASITA
CityColorno
Period15/11/1118/11/11

Keywords

  • Agricoltura di precisione
  • Irrigazione
  • Mais
  • Telerilevamento

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