Improving Irrigated Pasture Productivity and Soil Biodiversity in Oregon's High Desert

Progress report for FW20-358

Project Type: Farmer/Rancher
Funds awarded in 2020: $20,000.00
Projected End Date: 09/30/2021
Grant Recipient: Shine Brothers Ranch
Region: Western
State: Oregon
Principal Investigator:
John Shine
Shine Brothers Ranch
Expand All

Project Information

Abstract:

Irrigated systems in Lake County are used for grazing or hay production, as primary agricultural products of the county are beef cattle and hay  (USDA Census of Agriculture, 2017).  Irrigated systems provide regular water supply for growing livestock forages on the deeper soils in the county.  Over time, soil nutrients have been depleted and perennial forage species have declined in quantity and quality.  The common mode of operation is to till up the existing pasture and establish a new one.  However, this is a cost expensive strategy with  no realized profit until the second year. 

Our  project site is on old pasture system,  dominated by Kentucky Bluegrass (Poa Pratensis) which has formed a thatch layer and has a physiological dormancy in mid summer; so, irrigation is ineffective at producing feed for half of the growing season.  As irrigation cost is high, other strategies for increasing pasture productivity need to be employed.

We will divide the pasture blocks (replicates) and interseed improved pasture species (Treatment 1) or a mix of cover crops (Treatment 2) . One subplot will not be overdrilled as the control (Treatment 3). Prior to planting, the site will be grazed to provide light and effective irrigation for germinating seedlings.  Following establishment of the overseeded plants, pasture will be grazed in late summer.  We will collect data on seasonal pasture biomass yields, forage nutritional quality, grazing days, soil quality, and cost of production.  We will share our trial results with farm field days, a peer reviewed fact sheet, and presentations with agricultural groups including youth.

Project Objectives:

 

Our objectives are all attainable with our team approach, equipment on hand, and timeline we propose

Objective Measurement Method Accountability Time Line

Extension of grazing days 

Cow numbers will be tracked using PastureMap software

John will monitor cattle numbers 

May 2020 – September 2021

Increase soil health on pasture

Soil quality tests pre grazing and planting (May 2020); soil quality tests post planting, and post grazing (September 2020); soil quality tests  – May 2021 and May 2022

Fara and farm assistant will core soil samples

May 2020 – September 2020 May 2021, may 2022

Increase pasture biomass and productivity

Exclosure cages per treatment area will be clipped during active growing periods and compared with control exclosure which will also be clipped

Serkan will provide exclosure cages and John will place in field with farm assistant and Fara’s guidance.  Graduate student and Fara will clip caged areas.  Serkan will process samples to determine DM production and nutritive value

Starting from July 2020, during active growing seasons.

Determine if no till interseeding in existing pasture is effective long term

Interseeded areas will be marked with a GPS and revisited in May 2021 pre cattle entry to determine perennial plant viability as well as carryover from annual plant

Fara will GPS the interseeded areas

June 2020 and May 2021

Cooperators

Click linked name(s) to expand
  • Serkan Ates (Researcher)
  • Fara Brummer (Educator and Researcher)
  • John Shine - Producer

Research

Materials and methods:

Plot design:  Our project will be implemented on a 22 acre pivot irrigated field in Lake County Oregon which is comprised of a single soil type: (Drews Loam 73 B 0-5% slope; Ecological Site: Loamy 14-18 PZ).  In mid-May 2020, the pasture will be grazed at a high stocking density to remove the growing vegetation in preparation for interseeding.  During the first week of June 2020, a no till drill (Great Plains TM) with a 10 foot planting width will be rented from Lake County Soil and Water District.  This will be used to interseed the pasture in three blocks (replicates) of approximately 7.3 acres each with either a diverse mix of pasture or a mix of annual cover crops  (Table 1).  Planting will occur in randomized plots within each block with the following mixes that are identified in Table 1.  Control will be three buffers in each block 100 feet wide that will be left unseeded.  Plant species have been chosen for their soil health benefits (USDA, 2012) as well as grazing potential.  Nine exclosure cages (a total of 27 cages) will be placed in each pasture treatment. 

 

Treatment Planting Mix  Seeding rate (lbs) Pure Live Seed Targeted Objective Plant Life Cycle

TRT1

Diverse Pasture Mix

Orchard Grass

Tall Fescue

Alfalfa

Sainfoin

Birdsfoot Trefoil

Plantain

Chicory

Spotted Medic

Balansa clover

4

          15

           5

         30

           4

           4

           2

           4

           3

Soil health increase through nitrogen fixation, positive mycorrhizal fungi association

Higher grazing quality

Perennial and potential self -regenerating annuals

TRT2

Annual Cover Crop

Brassica (Pasja turnip)

Radish (Bio till radish)

Forage oat

Sudan grass

 

 

 

 

 

 

     

     3   

  2

          15

          45

 

 

 

 

 

 

 

Soil health increase through thatch penetration, erosion reduction, increase in soil organic matter, and the capture, recycle, and redistributing of nutrients in the soil profile

Higher grazing quantity and quality

Annual
CONTROL No interseeding on 100 foot wide strips      

Planting protocol:  All seeds will be planted based on PLS (pure live seed) rates to the appropriate depth.  Legumes will be inoculated with the species specific inoculum. Fertilizer will be applied at moderate levels based on soil test results to help newly germinating pastures.  

Soil Health Measurements:  Soil nutrient profile will be measured both pre and post grazing within three days of entry and exit, in fall 2020.  Additionally, soil will be sampled in May 2021 and May 2022 pre grazing entry to determine possible extended soil benefits.  

Update:  Soil health measurements were taken pre plant in May 2020 and will be repeated in May 2021

Soil samples will be cored randomly in triplicates per block treatment, and the samples will be composited and submitted per block for each treatment including control.  Soil samples will be taken at a depth of 6 – 12 inches and analyzed for pH, organic matter, bulk density, nitrates, phosphorus, potassium, sodium, magnesium, calcium, sulfur, manganese, iron, copper, and zinc.

Forage Quantity and Quality Measurements:

Dry matter production (lb/acre) and herbage growth rates (lb/acre/d) will be measured during active growth in spring, summer, and autumn. Herbage growth will be measured from a rectangular quadrat, harvested using electric hand clippers to a stubble height of approximately 2 inch. After collecting the forage cuts, the plots will all be mowed to the same height approximately 2 inch using a rotary mower. All herbage from the quadrate cuts will be oven dried at 140 F for 48 hours. Forage cuts will be sub-sampled for sorting into botanical fractions (sown forage, weed, dead material) before drying. Herbage growth rates will be calculated at each harvest by dividing total DM production by the number of elapsed days since the previous harvest. As animal unit months (AUMs) are measured by dry matter weight of forage, AUMs will be assigned to each forage variety, extrapolated to a per acre basis. Sub-samples of the mixtures will be also subjected to wet chemistry forage quality analyses which will include crude protein, acid detergent fiber, neutral detergent fiber, lignin, and nitrates.  Nutritive values of the forage samples will be determined in both years (establishment year and the following year).

Total Grazing Days on Pasture

Grazing days will be monitored through Pasture Map software.  Cow size will be determined and converted to AUM equivalent.  Pairs will be allocated both in mid May and later in late July.  Pasture and animal health will be monitored visually throughout that time period.  Summer grazing will terminate when forage has been grazed to a height of 4 inches overall.

Measurement of Project Success

The project will be successful if our objective of increasing grazing days and soil biodiversity are met.  Benchmark measurements of soil health will serve as a foundation for comparing our consecutive measurements through time (2.5 years).  In addition, grazing days are expected to increase for the first year with both our mixes (annual and perennial), and beyond with our perennial diverse mix establishing over time.  Costs of production should not outweigh net profits.  These will be measured for the duration of 2.5 years.

Research results and discussion:

Update:  Plots were seeded accordingly in mid-May but due to seed failure and existing perennial competition, re-seeding occurred in early July.  The latter seeding was successful and provided greater forage quality in the fall as represented in the table below.  This increase in forage quality allowed for 92 cow/calf pairs to be grazed in the fall for one week.  Timing of seeding was a critical lesson learned.  Planted novel species are expected to increase forage quality and soil health in 2021 and will be measured accordingly

Sep 16. 2020

Control

(Q4)

Forb mix

(Q1)

Cover crop mix (Q2)

Legume mix (Q3)

Birdsfoot trefoil 

    

SEM

P value

Forage production,

kg DM/ha

1482

1182

1028

1211

2500

421

0.17

Legume, %

0b

15a

1b

10a

40

1.7

0.01

Acid Detergent Fiber, %

26.5

23.7

24.4

25.3

21.3

0.79

0.14

Neutral Detergent Fiber, %

52.4

48.5

50.7

50.0

35.0

1.01

0.12

Ether Extract, %

2.6

2.7

2.6

2.6

2.5

0.19

0.99

Crude Protein, %

9.4c

12.7a

10.6b

11.3b

21.1

0.30

0.01

Participation Summary
1 Farmer participating in research

Educational & Outreach Activities

3 Consultations
1 Curricula, factsheets or educational tools
2 Published press articles, newsletters
1 Webinars / talks / presentations

Participation Summary

74 Farmers
19 Ag professionals participated
Education/outreach description:

Cover Crops council – Dec.17th presentation FINAL

Link for virtual webinar:  https://www.youtube.com/watch?v=t3HYpZ6U-IA&feature=youtu.be

Field Days:  Two field days will be held at the project site (Shine Brothers Ranches).  Both will be in the fall after grazing terminates.  Presenters will include John Shine, Serkan Ates, and Fara Brummer at the first field day and an invited speaker at the second field day.

Year 1:  A tour of the project site will occur with follow up discussion on cover crops and application to grazing and soil health.  A panel discussion will allow the project team to document interest in cover crops and possible expansion of interseeding these forages into existing pastures. Invited participants will include local ranchers and farmers, local soil and water conservation district members, University Extension professionals, local 4H and FFA groups, local Natural Resources Conservation Services and Farm Service agency personnel, and agricultural business representatives. In addition, Serkan will bring his college students from Oregon State University to participate in the field day.  

Update:  Due to Covid-19, a field day could not be hosted on site.  Instead, a virtual tour and webinar was presented through the western Cover Crops council, Intermountain region 

Year 2:  A tour of the project site will occur with follow up panel discussion.  The tour will be video taped for future web viewing.  The field day will also include a panel discussion on cover crops, grazing, and soil health with information from the project being explained through Power Point and handouts.  Our fact sheet will be advertised as work on it will have already begun.  Invited participants will include local ranchers and farmers, local soil and water conservation district members, University Extension professionals, local 4H and FFA groups, local Natural Resources Conservation Services and Farm Service agency personnel, and agricultural business representatives, as well as college students from Oregon State University.  

Peer Reviewed Fact Sheet:  A peer reviewed fact sheet will be prepared by Fara and Serkan in 2021 highlighting the information from this project.  Oregon State University Extension and Experiment Station Communications (EESC) department will provide assistance in designing this publication.  It will include information on cover crop potential under irrigation for the high desert region of Oregon with selection of forage species, planting guidelines, and economic benefits from utilizing cover crops and grazing to modify soil health and extend grazing days.  This fact sheet will also be applicable to the neighboring arid lands in the Great Basin desert which includes eastern Oregon, Nevada, and California.

Update:  In 2021, a fact sheet on one of our cover crops, birdsfoot trefoil as interseeded forage, was written as an educational resource.  This fact sheet is currently in peer review and will be distributed through Oregon State University Extension.  Another fact sheet on berseem clover for the same application is currently being developed and will also undergo peer review.

Web based outreach: Project information will be posted on social media such as the Oregon State University Extension Facebook page and twitter.  In addition, the project will be highlighted through the newly formed Western Cover Crops council. 

Update:  This project has been highlighted and discussed in an outreach forum through the western Cover Crops council.  Additionally, the project was presented with forage results through a webinar hosted by the western Cover Crops council, Intermountain region

Learning Outcomes

17 Farmers reported changes in knowledge, attitudes, skills and/or awareness as a result of their participation

Project Outcomes

2 Farmers changed or adopted a practice
3 Farmers intend/plan to change their practice(s)
1 Grant received that built upon this project
5 New working collaborations
Project outcomes:

This project has opened a new door here in eastern Oregon for the practice of interseeding or overdrilling beneficial forages (annual cover crops as well as longer lasting perennial forages) in existing perennial pastures that have been degraded over time.  This project will allow for more cost efficient renewal of an degraded perennial pasture than tearing up the pasture and renovating it through conventional tillage

Success stories:

One livestock producer from Idaho has decided to adopt the practice of overdrilling novel forages in his perennial pasture using the timing we have proposed within this project.  Early summer drilling in this desert region has the advantage of capturing increasing heat units as well as providing a usable forage base by fall especially when quick growing annuals are planted in the system.  Through the western Cover Crops council, discussion has supported our practice and rancher/farmers from the Intermountain region as well as the Pacific Northwest have shown interest in this concept

Recommendations:

Timing of seeding has been our challenge and opportunity within this project under irrigation.  Due to the high degree of variability in this region, early spring planting that would normally occur elsewhere will not work here.  Initially, we planted in May and our plots failed due to the high regrowth of the existing perennials in the pasture as well as the cold impact on emerging seedlings.  We also fertilized all treatment and control plots in May which further supported the existing cool season perennials.  This overwhelming competition from existing pasture compromised sunlight and water from our desired forages.  We decided to replant in July.  The summer planting brought success for our planted forages but compromised biomass and forage quality due to cold weather in the fall and the short window for growth.  If we had planted only two weeks earlier in mid June, we would have maximized potential of our desired planted forages.  However, due to time constraints, we had to opt for a July seeding in 2020.  Moving forward, we believe timing of seeding has been our biggest learning opportunity within this project.  

Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture or SARE.