scholarly journals The Askov long‐term field experiment (1894–2021) represents a unique research platform

2022 ◽  
Author(s):  
Bent T. Christensen ◽  
Ingrid K. Thomsen ◽  
Jørgen Eriksen
Keyword(s):  
Field Experiment ◽  
Research Platform ◽  
Term Field

Crop straw recycling prevents anthropogenic desilication of agricultural soil–plant systems in the temperate zone – Results from a long-term field experiment in NE Germany

Geoderma ◽  
2021 ◽  
Vol 403 ◽  
pp. 115187
Author(s):  
Daniel Puppe ◽  
Danuta Kaczorek ◽  
Jörg Schaller ◽  
Dietmar Barkusky ◽  
Michael Sommer
Keyword(s):  
Field Experiment ◽  
Agricultural Soil ◽  
Temperate Zone ◽  
Crop Straw ◽  
Ne Germany ◽  
Term Field

Exploring the Vis-NIR wavelength importance in SOC models under field and lab conditions in a long-term field experiment

2021 ◽  
Author(s):  
Javier Reyes ◽  
Mareike Ließ
Keyword(s):  
Field Experiment ◽  
Spectral Response ◽  
Nir Spectroscopy ◽  
Partial Least Square ◽  
Least Square ◽  
Field Conditions ◽  
Partial Least Square Regression ◽  
Preprocessing Technique ◽  
Term Field

<p>Soil organic carbon (SOC) is of particular interest in the study of agricultural systems as an indicator of soil quality and soil fertility. In the use of Vis-NIR spectroscopy for SOC detection, the interpretation of the spectral response with regards to the importance of individual wavelengths is challenging due to the soil’s composition of multiple organic and minerals compounds. Under field conditions, additional aspects affect the spectral data compared to lab conditions. This study compared the spectral wavelength importance in partial least square regression (PLSR) models for SOC between field and lab conditions. Surface soil samples were obtained from a long-term field experiment (LTE) with high SOC variability located in the state of Saxony-Anhalt, Germany. Data sets of Vis-NIR spectra were acquired in the lab and field using two spectrometers, respectively. Four different preprocessing methods were applied before building the models. Wavelength importance was observed using variable importance in projection. Differences in wavelength importance were observed depending on the measurement device, measurement condition, and preprocessing technique, although pattern matches were identifiable, especially in the NIR range. It is these pattern matches that aid model interpretation to effectively determine SOC under field conditions.</p>

A LONG-TERM FIELD EXPERIMENT WITH COMMERCIAL FERTILIZERS AND MANURE: I. Fertility levels and crop yields in a rotation of swedes, oats and hay

1960 ◽  
Vol 40 (2) ◽  
pp. 136-145 ◽  
Author(s):  
L. B. MacLeod ◽  
R. F. Bishop ◽  
L. P. Jackson ◽  
C. R. MacEachern ◽  
E. T. Goring
Keyword(s):  
Field Experiment ◽  
Cation Exchange Capacity ◽  
Crop Yields ◽  
Residual Effect ◽  
Exchange Capacity ◽  
Exchangeable Potassium ◽  
Soluble Phosphorus ◽  
Initial Content ◽  
Term Field

In a field experiment, conducted from 1936 to 1957, a rotation of swedes, oats and hay was followed and treatments included commercial fertilizers and manure.Changes in the chemical composition of the soil during the experiment included significant decreases in soil organic matter, total nitrogen and cation exchange capacity. In no case was the initial content of exchangeable potassium maintained and although changes in adsorbed and easily acid-soluble phosphorus were negligible with a number of treatments only one resulted in a significant increase.The treatments were applied in the swede year and yield differences with this crop were greater than for either the oats or hay. Data for the latter two crops indicated that with most of the treatments there was a tendency for yields to decline as the experiment progressed. This was not the case with swedes where variation in yields with rotation cycles was greater than it was in the case of oats or hay. There was a considerable residual effect from manure, and phosphorus had a greater effect on yields than either nitrogen or potassium.

Salinization lowers nutrient availability in formerly brackish freshwater wetlands; unexpected results from a long-term field experiment

2019 ◽  
Vol 143 (1) ◽  
pp. 67-83 ◽  
Author(s):  
Gijs van Dijk ◽  
Leon P. M. Lamers ◽  
Roos Loeb ◽  
Piet-Jan Westendorp ◽  
Rick Kuiperij ◽  
...  
Keyword(s):  
Field Experiment ◽  
Nutrient Availability ◽  
Freshwater Wetlands ◽  
Term Field

Decomposition of15N-Labelled Ryegrass in Soils from a Long-Term Field Experiment with Different Manuring Strategies

1995 ◽  
Vol 11 (1-4) ◽  
pp. 221-228
Author(s):  
Birgitte Kudahl Jensen ◽  
Erik Steen Jensen ◽  
Jakob Magid
Keyword(s):  
Field Experiment ◽  
Term Field
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