Knorr-Holden Plots
This experiment has been added by the GLTEN Curators using existing published sources.
- Objective
- The experiment was developed in response to a need to determine the best-irrigated farming method for continuous maize in the early 1900s for western Nebraska. The experiment is now used to study nitrogen use efficiency, crop yield, yield stability and soil properties.
- Data Access Statement
- Don't know
- Data license
- Don't know
- Data policy
- Don't know
- Organization
- University of Nebraska Panhandle Research & Extension Centerresearch organisation
- People
Site: Knorr-Holden Plot
- Location
- ScottsbluffNebraskaUSA
- Geographic location
- 41.8933852500851, -103.680901298016
- Visits permitted?
- No
- History
- The site was native short grass prairie which was was broken-up, then seeded to oats (Avena sativa L.) in spring 1911. From 1912 maize has been grown continuously.
- Soil description
- The soil is a Tripp very fine sandy loam soil (coarse-silty, mixed, superactive, mesic Aridic Haplustoll).
- Climate properties
Variable Time period Value (range) Units precipitation 396 millimeter
Design period: Period 1 (1912—1941)
- Description
- Single plot growing continuous maize without addition of any fertilizers.
- Number of plots
- 1
- Crop
Crop Years grown maize
Design period: Period 2 (1942—1952)
- Description
- The single plot was split in half to include a beef cattle manure treatment.
- Number of plots
- 2
- Crop
Crop Years grown maize - Factor
- Factor name
- Factor levels
- farmyard manure exposure
with FYM (27 t/ha)
1942—1953Application frequency: annuallyFYM as beef cattle manure.without FYM (0 )
1942—1953
Design period: Design 3 (1953—)
- Design Type
- Split-plot
- Design description
- A second replication of two main plots was added by expanding the experiment area into an adjoining plot. The second replication soil had a manure history of 27 t ha−1 yr−1 since 1942. Each of the four manure plots were split into 6 to test inorganic nitrogen fertilizer
- Number of plots
- 4
- Number of subplots
- 24
- Number of replicates
- 2
- Number of harvests per year
- 1
- Crop
Crop Years grown maize - Factors
- Factor name
- Factor levels
- farmyard manure exposure
with FYM (27 t/ha)
1953—without FYM (0 )
1953—- nitrogen fertilizer exposure Nitrogen rates are multiples of 45 kgN/ha
N0 (0 )
N45 (45 kgN/ha)
1953—N90 (90 kgN/ha)
1953—N135 (135 kgN/ha)
1953—N135+P (135 kgN/ha)
1953—Also receives 56 kgP/haN180 (180 kgN/ha)
1945—
- Measurement
Variable Material Units Frequency Scale Comment grain yield trait Not specified
Related publications
- Maharjan, B., Das, S., Nielsen, R., & Hergert, G. W. (2021). Maize yields from manure and mineral fertilizers in the 100-year-old Knorr–Holden Plot [https://doi.org/10.1002/agj2.20713]. Agronomy Journal https://doi.org/https://doi.org/10.1002/agj2.20713 [In English]