Klamath Experiment Station

Transcription

1 Cool-Season Grass Agroecozone Trial R.L. Dovel and J. Rainey' I ntroduction Irrigated pastures occupy over 95,000 acres in Klamath County and provide summer grazing for over 100,000 cattle. The currently recommended grass variety for irrigated pastures is Fawn tall fescue, a variety released in Quackgrass is also an important hay and pasture species in the area. Recently developed cultivars need to be evaluated for adaptation to the Klamath Basin. The acquisition of new germplasm from international forage breeding programs adds further emphasis to the development of a forage variety screening program in the Klamath Basin. Results from a single trial location would be applicable only to that location. By establishing identical trials in different locations and documenting environmental conditions in each location, extrapolation of the data to other areas may be possible. Environmental conditions that should be monitored include soil type and ph, maximum and minimum daily temperature, precipitation, slope and aspect, and irrigation. Such a trial, called an agroecozone trial, was proposed with a complement of perennial forage grasses representing a range of forage species. Procedures An agroecozone trial was established on sandy loam soil at the KES in August, A similar trial was established in Powell Butte at the Central Oregon Agricultural Research Center. Only data from KES will be discussed here. The trial was arranged in a randomized complete block design with four replications. Soil samples were analyzed, and appropriate fertilizer was applied prior to planting. Seed was drilled to a depth of 1/4 inch using a modified Kincaid plot drill. Seeding rates used in the trial are included in Table 1. Plots were 5 x 20 feet with 3-foot wide alleyways. Plots were irrigated with solid set sprinklers. Forages were allowed to grow uncut through the first growing season. Three harvests per year were taken when plants began to flower in Crops were harvested with a flail harvester. All yields are reported on a dry weight basis. Forage quality, as determined by crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF), total digestible nutrients (TDN), and relative feed value (RFV), was evaluated from samples obtained at all harvests. Results The greatest early season growth was produced by PCR, a perennial cereal rye. This entry produced over 5 tons of dry matter per acre by June 22 (Table 2). The second highest yielding entry in the trial was Matua prairie grass. It produced significantly higher levels of forage than all other entries except for the two tall fescue entries. Other entries with high levels of early spring growth, over 2 tons of dry matter per acre by June 22, included Fawn tall fescue, Festorina tall fescue, Potomac orchardgrass, Gala grazing brome, Bromar mountain brome, and Linn perennial ryegrass. Wana, a grazing tolerant orchardgrass, did not Associate Professor and Biological Sciences Research Technician III, respectively, Klamath Experiment Station, Klamath Falls, OR. 66 KLAMATH EXPERIMENT STATION 1995

2 Cool-Season Grass Agroecozone Trial produce much early spring growth and only yielded 1,180 lb dry matter/acre by June 22. Palaton reed canarygrass also produced low levels of forage in the first cutting compared to its forage production in the second cutting. PCR had the lowest forage quality, based on all quality parameters measured, of any entry at the first cutting (Table 2). Gala grazing brome also had lower quality than most entries at the first cutting, probably due to advanced maturity. Forage quality of Linn perennial ryegrass was also depressed in the first cutting due to advanced maturity. Although PCR produced more dry matter than any other entry at the first cutting, regrowth following cutting was poor. PCR only produced 970 and 730 lb dry matter/acre in the second and third cuttings, respectively (Tables 3 and 4). Matua prairie grass produced almost 3 tons of dry matter/acre in the second cutting, significantly higher than all other entries in the trial (Table 3). Other high yielding varieties in the second cutting included Bromar mountain brome, Potomac and Wana orchardgrass, Palaton reed canarygrass, Festorina and Fawn tall fescue, and Gala grazing brome. Second cutting yields of both Wana orchardgrass and Palaton reed canarygrass were significantly higher than their first cutting yields. Matua prairie grass produced significantly higher third cutting forage yields than all other entries. Other entries producing above average third cutting forage yields included Fawn and Festorina tall fescue, Wana and Potomac orchardgrass, Bromar mountain brome, and Gala grazing brome. Matua produced the highest total season forage production, almost 7.5 tons of dry matter /acre, which was significantly higher than all other entries (Table 5). Despite the excellent hay yields and quality of Matua, growers should be cautious of planting this variety due to winter kill and stand loss due to mismanagement. This variety has experienced severe stand losses in the winter, probably due to fungal attack. It also will not withstand continuous grazing or prolonged flooding. Due to high production and high protein content, nitrogen fertilization requirements are higher for Matua than other grass species. The second highest yielding entry was PCR, which produced forage mostly in the first cutting and had forage quality similar to hay produced by other cereal rye varieties. Other more typical grasses that produced high total forage yields include Bromar mountain brome, Fawn and Festorina tall fescue, and Potomac orchardgrass. Bromar mountain brome is a short lived perennial. It is sod forming and is used extensively in reclamation work. It would make a significant contribution to forage yields for short term pastures, but would eventually be replaced by stronger perennial grasses. Festorina is actually a Festulolium or tall fescue-perennial ryegrass cross. It is a forage-type tall fescue that has smoother, finer leaves than traditional tall fescue varieties. It is said to have higher forage quality than traditional tall fescues like Fawn. There was no difference in forage yield or quality between Fawn and Festorina in this trial. Leaves of Festorina are not as rough as leaves of Fawn and it is reported to be more palatable than Fawn. More study is required to determine if tall fescue-perennial ryegrass crosses are as persistent in the Klamath Basin as tall fescue. KLAMATH EXPERIMENT STATION

3 Table 1. Seeding rates for species included in forage agroecozone trials established at Klamath Falls, OR in Species Common name Seeding Rate Bromus willdenowii B. stamineus B. riparius B. marginatus Dactylis glomerata Festuca arundinacea Lolium perenne Poa pratensis Alopecuras arundinaceus Thinopyrum intermedium Elymus lanceolatus Secale cereale Phalaris arundinacea Phleum pratense prairie grass grazing brome meadow brome mountain brome orchardgrass tall fescue perennial ryegrass bluegrass creeping foxtail intermediate wheatgrass thick spike wheatgrass perennial cereal rye reed canarygrass timothy Kg/ha g/m KLAMATH EXPERIMENT STATION 1995

4 Table 2. Agroecozone First Cutting, first cutting forage yield, protein concentration, acid detergent fiber (ADF), neutral detergent fiber (NDF), total digestible nutrients (TDN), and relative feed value (RFV) of various cool-season grasses planted at Klamath Experiment Station in August, Selection Species' Yield Yield Quality Protein ADF NDF TDN RFV ton/a Park BLG Madera PRG Garrison CFT Palaton RCG Wana OG Clair OG Cereal PCR Carlton TIM Fawn TF Gala GB Matua PG Festorina TF Potomac OG Linn PRG Critana TSWG Regar MDB Bromar MTB Oahe IWG Mean CV (%) LSD (0.05) 'BLG bluegrass PCR CFT creeping foxtail PG GB grazing brome PRG IWG intermediate wheatgrass RCG MDB meadow brome TF MTB mountain brome TIM OG orchardgrass TSWG perennial cereal rye prairie grass perennial ryegrass reed canarygrass tall fescue timothy thick spike wheatgrass KLAMATH EXPERIMENT STATION

5 Table 3. Agroecozone Second Cutting, second cutting forage yield, protein concentration, acid detergent fiber (ADF), neutral detergent fiber (NDF), total digestible nutrients (TDN), and relative feed value (RFV) of various cool-season grasses planted at Klamath Experiment Station in August, Selection Species' Yield Yield Quality Protein ADF NDF TDN RFV ton/a 0/0 Park BLG Madera PRG Garrison CFT Palaton RCG Wana OG Clair OG Cereal PCR Carlton 11M Fawn TF Gala GB Matua PG Festori na TF Potomac OG Linn PRG Critana TSWG Regar MDB Bromar MTB Oahe IWG Mean CV (%) LSD (0.05) 'BLG bluegrass PCR perennial cereal rye CFT creeping foxtail PG prairie grass GB grazing brome PRG perennial ryegrass IWG intermediate wheatgrass RCG reed canarygrass MDB meadow brome TF tall fescue MTB mountain brome TIM timothy OG orchardgrass TSWG thick spike wheatgrass 70 KLAMATH EXPERIMENT STATION 1995

6 Table 4. Agroecozone Third Cutting, third cutting forage yield, protein concentration, acid detergent fiber (ADF), neutral detergent fiber (NDF), total digestible nutrients (TDN), and relative feed value (RFV) of various cool-season grasses planted at Klamath Experiment Station in August, Selection Species' Yield Yield Quality Protein ADF NDF TDN RFV ton/a Park BLG Madera PRG Garrison CFT Palaton RCG Wana OG Clair OG Cereal PCR Carlton TIM Fawn TF Gala GB Matua PG Festorina TF Potomac OG Linn PRG Critana TSWG Regar MDB Bromar M Oahe IWG Mean CV (%) LSD (0.05) 'BLG bluegrass PCR perennial cereal rye CFT creeping foxtail PG prairie grass GB grazing brome PRG perennial ryegrass IWG intermediate wheatgrass RCG reed canarygrass MDB meadow brome TF tall fescue MTB mountain brome TIM timothy OG orchardgrass TSWG thick spike wheatgrass KLAMATH EXPERIMENT STATION

7 Table 5. Agroecozone 1995 Yield Summary forage yield summary of cool-season grasses planted at Klamath Experiment Station in August, Selection Yield Specie& Cut 1 Cut 2 Cut 3 Total Total ton/a Park BLG Madera PRG Garrison CFT Palaton RCG Wana OG Clair OG Cereal PCR Carlton TIM Fawn TF Gala GB Matua PG Festorina TF Potomac OG Linn PRG Critana TSWG Regar MDB Bromar MTB Oahe IWG Mean CV (%) LSD (0.05) 'BLG bluegrass PCR perennial cereal rye CFT creeping foxtail PG prairie grass GB grazing brome PRG perennial ryegrass IWG intermediate wheatgrass RCG reed canarygrass M DB meadow brome TF tall fescue MTB mountain brome TIM timothy OG orchardgrass TSWG thick spike wheatgrass 72 KLAMATH EXPERIMENT STATION 1995