Thyrow Endurance Field Experiments: Soil fertility experiment

Local identifier
Thy_D6
Years operational
1938—
Objective
Effect of different forms and amounts of organic fertilizers in combination with mineral N fertilization on the soil fertility and yield performance of a sandy soil
Description
The experiment was initially carried out in 1938 under the name "Endurance experiment to increase soil fertility by supplying organic and other substances". The question was investigated whether soil fertility can be sustainably improved by the use of various organic "substitute" fertilizers and by melioration by means of clay soil from the Oderbruch. Due to the lack of provision of the organic "substitute" fertilizers referred to as "other substances", the different application of manure was switched to in the course of the experiment and straw and green manure were included in the experiment from 1955 In the course of the intensification of agriculture in the 70s, the experimental question was expanded in 1970. In the "soil fertility experiment" that has been ongoing so far, mineral N fertilization was introduced as a second factor in triple gradation. After 15 years, the initially very high N-fertilizer level was reduced in order to answer questions about maximum nutrient efficiency. The original seven-field crop rotation has been simplified and better adapted to the site conditions. Since 2005, silage maize and winter rye have been cultivated in crop rotation. Compared to the nutrient deficiency test (Thy_D4), this test has included a test member with manure fertilization and liming since 1998 in order to investigate the manure effect unaffected by soil acidification. The research work focuses on investigations of long-term C and N dynamics with now highly differentiated Corglevel in the ground.
Data Access Statement
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Data license
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Data policy
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Organization
Humboldt University Berlin
People

Site: Thyrow

Type
research station field
Local code
Thy_D6
Location
Thyrow
Germany
Geographic location
52.150912, 13.140926
+−
© OpenStreetMap contributors
Visits permitted?
No
Soil type
luvisol
Soil description
Albic Luvisol
Soil properties
VariableDepthValue (range)UnitsRef yearEstimated?Baseline?
sand content 83.1 Percent
silt content 16.2 Percent
clay content 2.7 Percent
soil pH (5.5 – 8)

Design period: Current design period (1970—)

Description
Mineral N fertilization introduced as a second factor
Design description
Number of test members: 10x3=30+15 standards Number of repetitions: 2 Number of cuts: 30x2=60 +30 (for standards) = 90 Test crop = winter rye
Crops
CropYears grown
winter rye
maize
Factors
Factor name
Factor levels
nitrogen fertilizer exposure
N1 (a1)  (0 kgN/ha)
without nitrogen fertilizer
N2 (a2)  (60 kgN/ha)
with N fertilizer lower rate
N3 (a3)  (120 kgN/ha)
with N fertilizer higher rate
natural fertilizer exposure
manure (b1)
without PK
without organic fertilizer (b2)
with PK
manure 1 (b3)  (200 deciton per hectare)
with PK
manure 2 (b4)  (400 deciton per hectare)
with PK
green manure (b5)
with PK
manure 1 + g
with PK
straw with N-compensation / green manure (b7)
with PK
straw with N-compensation (b8)
straw without N-compensation (b9)
manure 1 / oderbruch (b10)
Factor combinations
a1+b1
nitrogen fertilizer exposure: N1 (a1)
natural fertilizer exposure: manure (b1)
a1 + b2
nitrogen fertilizer exposure: N1 (a1)
natural fertilizer exposure: without organic fertilizer (b2)
a1 + b3
nitrogen fertilizer exposure: N1 (a1)
natural fertilizer exposure: manure 1 (b3)
a1 + b4
nitrogen fertilizer exposure: N1 (a1)
natural fertilizer exposure: manure 2 (b4)
a1 + b5
nitrogen fertilizer exposure: N1 (a1)
natural fertilizer exposure: green manure (b5)
a1 + b6
nitrogen fertilizer exposure: N1 (a1)
natural fertilizer exposure: -

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