Joe Lauer, Corn Agronomist

Transcription

1 1998 Seed Dealer Update Meetings Joe Lauer, Corn Agronomist

2 1997 University of Wisconsin Ashland Corn Agronomy Program Spooner White Lake Chippewa Falls Marshfield Seymour Galesville Hancock Valders Fond du Lac Wisconsin On-Farm Testing Arlington Lancaster Janesville

3 GDU Accumulation during 1997 at Arlington, WI. GDU bars around average occur 4 of 5 years Killing frost date 500 Average Actual â â 0 1-May15-May29-May12-Jun26-Jun10-Jul24-Jul7-Aug21-Aug4-Sep18-Sep2-Oct16-Oct30-Oct

4 1997 Wisconsin Corn Hybrid Performance Trial Summary Location N Yield N Yield N Yield Arlington Janesville Lancaster Fond du Lac Galesville Hancock Chippewa Falls Marshfield Seymour Valders Ashland Spooner White Lake Note: Seymour average includes Waupaca, 1987 and New London White Lake average includes Antigo, 1987

5 Milk per Acre (lb b/a) Corn hybrid silage yield and quality in the south central production zone of Wisconsin High yield Early Trial Late Trial High yield & quality High quality Milk per Ton (lb/t)

6 Materials and Methods Plant density (plants/acre) 18000, 24000, 30000, 36000, and Corn hybrids selected for similar maturity, silage yield, and grain yield. Hybrids differed for silage quality traits Ashland ARS Spooner ARS Marshfield ARS Valders Arlington ARS Lancaster ARS

7 Relationship between corn silage yield and plant density between 1994 and (T/A) DM yield Silage Harvest plant density (number/a)

8 Relationship between corn silage neutral detergent fiber (NDF) and plant density between 1994 and NDF (%) Harvest plant density (number/a)

9 Relationship between corn silage in vitro digestibility (IVD) and plant density between 1994 and NDF (%) Harvest plant density (number/a)

10 Relationship between corn silage Milk per ton and plant density between 1994 and lk per Ton Mi Harvest plant density (number/a)

11 Relationship between corn silage Milk per acre and plant density between 1994 and k per Acre Mil Harvest plant density (number/a)

12 Corn silage hybrid relationship between Milk per ton and plant density between 1994 and 1996 in Wisconsin HQ Milk per Ton LQ Milk per Ton 2000 per Acre 1900 Milk Plant density (A)

13 Conclusions Silage yield continued to increase with increasing plant density. Corn silage quality (Milk per Ton) is best at low plant density. An economic (Milk per Acre) trade-off exists for plant density. As plant density increases, silage yield increases, but quality (Milk per Ton) decreases. Thus, Milk per Acre is maximized at 30,000 plants/a. Plant density affected hybrid silage quality similarly. Should plant density recommendations change moving from south to north in Wisconsin? Optimum corn silage plant density recommendations are similar to corn grain plant densities within Wisconsin. For corn grain, a slight advantage exists for increasing plant densities moving from south to north in Wisconsin.

14 Efficacy of Corn Seed Treatments Disease Captan Maxim Apron Rhizoctonia G G P Fusarium G E P Pythium P P E Helminthosporium G G P Penicillium G G P Aspergillus G G P derived from Pedersen, U. of Illinois

15 Corn seed treatment plant density response in Wisconsin Captan+Apron Maxim+Apron UTC NS Pla ant density (number r/a) NS Arlington Fond du Lac Janesville

16 Corn seed treatment yield response in Wisconsin. Grain yie eld (bu/a) NS Captan+Apron Maxim+Apron UTC NS Arlington Fond du Lac Janesville

17 How good are you at picking top corn hybrids? Frequency (%) Above trial average Below trial average Randomly Location Zone star Location selected star and zone star Average Bottom 10% Location Zone star Location star (2yrs) (2yrs) and zone star (2yrs)

18 Hybrid selection should be based on: Multi-environment averages Consistency

19 SELECT 97 A program for choosing crop varieties

20 Ashland University of Wisconsin Corn Agronomy Program Spooner Chippewa Falls White Lake Galesville Marshfield Hancock Seymour Valders Fond du Lac Lancaster Arlington Janesville

21 Top 10 corn hybrid yields in the northern production zone of Wisconsin during Hbrid Hybrid Yield (bu/a) Moisture (%) Dekalb DK385B Dairyland ya Stealth Dahlco Carhart's Blue Top CX92A NK Brand NX Brown's Mycogen Seeds Dahlco Kaltenberg K Dekalb DK

22 Milk per Acre (lb b/a) Corn hybrid silage yield and quality in the southern production zone of Wisconsin. High yield Early trial Late Trial Milk per Ton (lb/t) High yield & quality High quality

23 Milk per Acre (lb b/a) Corn hybrid silage yield and quality in the north central production zone of Wisconsin High yield Early Trial Late Trial Milk per Ton (lb/t) High yield & quality High quality

24 Relationship between corn silage Milk per Acre, Milk per Ton, and plant density between 1994 and 1996 in Wisconsin Mil lk per Acre Mi ilk per Ton Plant density (A) HQ Milk per Acre LQ Milk per Acre HQ Milk per Ton LQ Milk per Ton

25 Corn silage hybrid relationship between Milk per acre and plant density between 1994 and 1996 in Wisconsin HQ Milk per Acre LQ Milk per Acre Milk per Acre Plant density (A)