alfalfa, hay plantpop 400.0 dmaxshoot 1.0 cbaflag 0 tgtyield 3.0 cbafact 1.0 cyrafact 1.0 hyldflag 2 hyldunits ton/ac hyldwater 15.0 hyconfact 4.465 idc 3 grf 1.0 ck 0.69 hui0 0.9 hmx 1.0 growdepth 0.01 rdmx 2.0 tbas 3.0 topt 30.0 thudf 1 dtm 120 thum 1800.0 frsx1 -5.0 frsx2 -9.44444 frsy1 0.01 frsy2 0.95 verndel 0.0 bceff 30 a_lf 0.023 b_lf 0.8063 c_lf 0.4146 d_lf -0.061 a_rp -0.024 b_rp 0.9911 c_rp 0.6435 d_rp 0.0494 a_ht 0.2 b_ht -0.075 ssaa 3.9 ssab 1.0 sla 30 huie 0.05 transf 0 diammax 0.3 storeinit 2.0 mshoot 110.0 leafstem 0.6 fshoot 0.013 leaf2stor 0.2 stem2stor 0.2 stor2stor 0.1 rbc 2 standdk 0.0536 surfdk 0.0536 burieddk 0.0536 rootdk 0.0536 stemnodk 0.2 stemdia 0.0020 thrddys 20.0 covfact 7.0 resevapa -1.20379 resevapb 0.604887 yield_coefficient 0.0 residue_intercept 0.0 regrow_location 0.0 noparam3 0.0 noparam2 0.0 noparam1 0.0 crop_notes Size ranges J.J. rquez-Ortiz, J.F.S. Lamb, L.D. Johnson, D.K. Barnes and R.E. Stucker, 1999, Heritability of crown traits in alfalfa, Crop Science, Vol 39, Issue 1 pgs. 38-43 Crown Depth (distance from the soil level to the top of the tap root) - 0.5cm to 5cm Crown width (just below the soil surface) - 2cm to 12cm or greater Number of crown stems - 2 to 10 or more Crown stem width - 2mm to 6mm or greater Number of crown buds - none to 12 or more D.K. Barnes, R.B. Pearce, G.E. Carlson, R.H. Hart, and C.H. Hanson. 1969. SPecific Leaf Weight Differences in Alfalfa Associated with Variety and Plant Age. Crop Science, Vol 9, pgs. 421-423. Values of Specific leaf weight measured in the paper varied from 2.15 to 4.3, with early season growth mostly in the area of 2.15 to 2.72 mg/cm^2 Conversion to m^2/kg is * 10^6 mg/kg * 10^-4 m^2/cm^2 = 100 / mg/cm^2 2.15 mg/cm^2 = 100 / 2.15 m^2/kg = 46.5 m^2/kg, 100 / 2.72 = 36.8, 100 / 4.3 = 23.3 M. H. Hall, C. J. Nelson, J. H. Coutts and R. C. Stout. 2004. Effect of Seeding Rate on Alfalfa Stand Longevity. Agron. J. 96:717-722 Stem densities for the MO94 study (data not presented) were not different among seeding rates at any sampling time. There were 623 stems m–2 13 MAP and only 350 stems m–2 by 25 MAP. Stem density remained nearly constant at that level through 49 MAP. During the same time period, plant density declined from an average of 100 down to 25 plants m–2. This means that there was a fourfold increase in stems per plant from 25 to 49 MAP during the same time period. Thereafter, stem density continued to decline to 290 and 260 stems m–2 at 63 and 73 MAP, respectively, while plant density fell below 15 plants m–2 during the same time period. Crowns develop stems in response to light (Cowett and Sprague, 1962) and apparently could not continue to maintain high stem density with the thin stand and older plants. data as shown above. MAP = months after planting SPM2 = stems per square meter PPM2 = plants per square meter SPP = stems per plant MAP SPM2 PPM2 SPP 13 623 100 62.3 25 350 36 9.7 49 350 25 14 63 290 16 18 73 260 13 20 With the critical period of alfalfa being establishment, a stem count, equals plant count of 400 stems per square meter is used to try and get early cover. Fick, G.W., D.A. Holt, D.G. Lugg. 1988. Environmental Physiology and Crop Growth. in A.A. Hanson, D.K. Barnes, R.R. Hill , Jr., eds. 1988 Alfalfa and Alfalfa Improvement. Agronomy Monograph Number 29. American Society of Agronomy. page 181. Growth temperatures: GDD base from 0 to 5 C, varies depending on time of year. GDD totals 0 C base, 700 to bud, 880 to first flower, 1075 to full bloom, 1900 to ripe seed stages. Suggests a GDD max temperature around 30 C