New science to model perennial vegetation more accurately in response to haying and grazing Giulio Ferruzzi, WNTSC Agronomist (NRCS RUSLE2 science lead)

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Presentation transcript:

New science to model perennial vegetation more accurately in response to haying and grazing Giulio Ferruzzi, WNTSC Agronomist (NRCS RUSLE2 science lead) Linda Scheffe, NSSC Agronomist (NRCS RUSLE2 database manager) Steve Boetger, ENTSC Agronomist Steve Woodruff, ENTSC Agronomist/Forage Specialist

This new button is where the new information is found!

AVAILABLE (Above Graze Height) UNAVAILABLE (Stubble) Live Above Ground Biomass AFFECTED (Portion that will be converted to something other than live biomass) UNAFFECTED (Not ingested nor killed due to soiling or vicinity to manure) PRODUCTION (Meat or hay removed from field) SURFACE RESIDUE FORAGE (What the livestock actually ingest) EXTERNAL (Burning) STANDING RESIDUE SURFACE RESIDUE Available Live Above Ground Biomass OFF TO MARKET Affected Live Above Ground Biomass Forage NOTE: Similar paths exists for standing residue Portion affected to surf. res. Portion affected to stand res. Portion available unaffected Portion affected to external Portion forage to surf. res.

ParameterDefinition # yrs to maturityyears from establishment to maturity Abs pot cut htcutting height for optimal management (used to determine "potential" forage yield) Ann total biomass prod targetuser specified target of total annual NPP Envelope midpt portionfraction of maximum biomass resulting from repeatedly cutting at half of Hmax (=0.5 if not sod forming) Existing rootmassbiomass of live woody roots when beginning growth in the presence of existing perennial vegetation Fastest growth in overall cycle occurs Part of season with fastest growth during establishment (EARLY, MIDDLE, LATE) How specified prod over yearspecify either total biomass or total forage production to moded the vegetation Ht at max mass no cutuser specified vegetation full canopy height if uncut (not maximum inflorescence height) Max fall maturity Max fall height is a single, representative maximum distance that a raindrop falls to the soil surface after being intercepted by canopy. Normal seeding datenormal seeding date (default = not specified, full-year calculations begin on 1/1) Prod portionMonthly Production Fraction: Fraction of the total production occurring in a month. RS*:target root/shoot ratio12 monthly estimates of RS*:target root/shoot ratio (default=2.0 for perennial vegetations and default=0.5 for annuals) Shoot lifespan12 monthly average lifespan values for above ground live biomass Smallest biomass to give full coverThe smallest amount of biomass that can achieve 100% canopy cover Start live above ground biomassinitial value of above ground live biomass when seeded (0 = treat as mature) Start rootmassinitial value of active root when seeded (0 = treat as mature) Start storage biomassinitial value of storage biomass when seeded (0 = treat as mature) Vegetation typeeither annual or perennial (no woody roots created for annuals)

First, you will need to determine which types of systems you would like to have available for the field offices. Some examples are:

Secondly, you will need to obtain the forage production information for those vegetations from reputable sources (e.g. NRCS grazing lands specialists, Land Grant Universities, etc.).

Next, along with your Regional Agronomist, you will create vegetation and associated management records for the appropriate Forage Production Zone(s). Finally, you will coordinate with your neighboring State Agronomists and Grazing Lands Specialists to determine the extent of the area for which the new records apply. That is, you will draw/edit/verify the boundaries of the Forage Production Zone(s) and create new ones if necessary. New Forage Production Zones