Developing a fast method to appraise alfalfa for multi peril crop insurance. Marisol Berti Dep. of Plant Sciences North Dakota State University
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1 2013 NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND
2 2013 NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND Developing a fast method to appraise alfalfa for multi peril crop insurance Marisol Berti Dep. of Plant Sciences North Dakota State University
3 North Dakota Alfalfa Production Alfalfa only 413,028 acres Alfalfa/grass mixtures 159,938 Pasture <25% alfalfa 819,457 Total 1,392,423 NASS, NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND
4 2013 NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND
5 2013 NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND
6 What affects alfalfa yield? Stand age Plant/stem density Water Diseases Soil fertility 2013 NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND
7 Yield and age of stand Effect of stand age in alfalfa yield 1971-present Undersander, NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND
8 Seeding rates and yield 8 lbs/acre Meyer, NCIS MN/ND/SD Annual Meeting, 8 January, Fargo, ND
9 No differences in yield in the seeding year with seeding rates from 6 to 18 lbs/acre (Hall et al., 2010) Hall et al., 2010
10 Alfalfa yield in years 3-5 (Hall et al., 2012)
11 Seeding rate during years 3-5 (Hall et al., 2012) 7-10 pl/ft pl/ft pl/ft 2
12 Plant and stem density and yield Alfalfa stem count and yield potential 7 6 dry matter yield (tons/acre) stems/ft 2 may be adequate stems per square foot Volenec et al.
13 Objectives 1) Determine the relationship between plant and stem density, and forage yield in glyphosate tolerant as alfalfa stands age in North Dakota. 2) Develop an accurate and efficient method to appraise alfalfa for multi peril insurance.
14 Materials and Methods Three experiments Exp 1. Seeding rate study Established at Fargo, Prosper, and Carrington, ND, in Exp. 2 Plant and stems density on forage yield Established in a 3 year old glyphosatetolerant alfalfa in Prosper, ND Exp. 3. Plant and stems density on forage yield Established in a 7 year old glyphosatetolerant alfalfa in Fargo, ND
15 Experiment 1 A replicated experiment was established at three locations Fargo, Prosper, and Carrington. The experimental design is an RCBD with six seeding rates: 1, 5, 10, 15, 20, and 25 kg pure live seed/ha
16 Experiment 2 Established in June Glyphosate tolerant alfalfa cultivars: MaxiPro 3.10 RR Consistency 4.10 RR Graze N Hay 3.10 RR Plant densities: T1, low < 10 plants/m 2 T2, plants/m 2 T3, plants/m 2 T4 > 50 plants/m 2.
17 Experiment 3 Established in March 31 st 2007 Cultivar DKA34 17RR. CRD, 5 reps Plant densities: T1 < 31 plants/m 2 T plants/m 2 T plants/m 2 T plants /m 2 T5 > 53 plants/m 2
18 Materials and Methods Plot planter 8 rows at 6 inches apart. Plots 1.5 m wide x 6 m long.
19 Materials and Methods Forage harvester Carter flail harvester 3 ft. wide, scale incorporated for whole plots, and by hand in 1m 2 plot Seeding year : two harvests at late bud to 10 % bloom Production years: three or four harvest at late bud to 10% bloom Plant and stem density was taken in 1m 2
20 Results Exp. 1 Yield vs. seeding rate Forage yield ( tons/acre) y = x x r² = 0.90 y = x x r² = Seeding rate (kg/ha) y = x x r² = 0.91 Carrington Prosper Fargo Maximum yield with approx. 13 lbs/acre
21 Results Exp. 1 Seeding year y = x x Fargo and Prosper maximum yield r² = with approx. 10 plants/ft2 y = x x r² = and 50 stems/ft2 Carrington Carrington maximum yield with Prosper approx. 5 plants/ft2 and 37 Fargo 1 stems/ft2 y = 1E 04x x r² = Plant density (plants/m2) 150 Forage yield ( tons/acre) Forage yield ( tons/acre) y = 1E 05x x r² = 0.89 y = 1E 05x x r² = 0.99 Carrington y= 4E 06x x r² = 0.85 Prosper Fargo Stem density (plants/m2)
22 Exp. 1 combined across locations 3 Forage yield (tons/acre) y = 5E 06x x r² = Stem density ( stems/m 2 ) Forage yield ( tons/acre) y = x x r² = Plant density ( plants/m 2 ) Forage yield (tons/acre) y = x x r² = Seeding rate (kg/ha) stems/ft plants/ft lbs/acre
23 What seeding rate is economical in the seeding year? Seeding rate Forage yield Seed cost/acre Seed cost/acre Gross revenue (Y max Y x )* $4.0 lbs/acre tons/acre 6.50/lb $@4.00/lb $200/ton $ $
24 Results Exp. 2 and 3 Dry matter yield ( tons/acre) y = x x r² = 0.99 y = 0.006x x 7.2 r² = Plant density (plants m 2 ) Fargo 6 yr old Prosper 3 yr old Year stems/ft plants/ft 2 Seeding year stems/ft plants/ft 2 Dry matter yield ( tons/acre) y = x 2E 05x 2 r² = 0.99 y = x 5E 05x 2 r² = Stem density (stems m 2 ) Fargo 6 yr old Prosper 3 yr old
25 Conclusions Increasing seeding rate above 13 lbs/acre does not increase the forage yield in the seeding year. The cost of additional seed is greater than the increment in yield above 9 lbs/acre.
26 Conclusions Seeding year stems/ft plants/ft lbs/acre Stem density and plant density are both closely correlated with forage yield in the seeding year. Both could be used to estimate yield potential. Year stems/ft plants/ft 2 In older stands stem density predicts slightly better the yield potential. As plants get older they have more stems per plant independent the density
27 Thank you for your attention and interest Marisol Berti Associate professor 270A Loftsgard Hall, Dept. 7670, PO Box 6050 Fargo, ND Phone: , cell : ,f ax marisol.berti@ndsu.edu
28 QUESTIONS???
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