Fertilizer application on the LFL

Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use

Log of fertilizer date, type, amount, management, etc. Starter fertilizer was applied to corn when planted; nitrogen applied after PSNT (pre sidedress nitrate test) in June. No fertilizer was applied to soybeans. Fertilizer was applied to wheat in early spring; applied in fall at planting through 1994. Lime was applied to all plots on 9/29/1992 at a rate of 2T/a.

This datatable is part of the Living Field Laboratory dataset.

The Living Field Laboratory is a long-term rotation study established in 1993 under the direction of Emeritus Professor Dr. Richard Harwood to evaluate the benefits of cover crops (as green manure) and/or the addition of composted dairy manure in two integrated systems compared to a conventional and an organic system. The LFL accommodates every entry point of the crop rotation each year and has a factorial design that allows for the comparison of a number of interactions. These interactions include: differences in N management, rotation effects, and cover crops. From 1993 through 2005, the rotation consisted of corn (Zea mays L.)/corn/soybean (Glycine max)/wheat (Triticum aestivum) vs. continuous corn. During this period, crimson clover (Trifolium incarnatum L.) was seeded to 1st yr. corn, 2nd yr corn was in rye grass (Lolium multiflorum), soybean had no cover, and red clover (Trifolium pretense L.) was frost-seeded into wheat.

In 2006, under the direction of Dr. Sieglinde Snapp and through consultation with a farmer advisory group, the rotation was shortened to a 3 yr rotation of corn/soybean/wheat vs. continuous corn. The remaining plot in each management system was converted to a 2 yr rotation of corn/soybean. Cereal rye (Secale cereale) is now planted after corn regardless of crop rotation. Cereal rye follows soybean in the 2-yr rotation. Red clover is frost-seeded into wheat.

The management systems are: Conventional, Integrated Fertilizer and Integrated Compost. Weed management is identical across systems, and nitrogen fertilizer management adjusted to take into account soil N availability and balance nitrogen inputs across treatments. The cover crop is present as a split plot (plus minus) within each system. The split-plot cover crop treatment was established in 1993 in Integrated Fertilizer and in Integrated Compost, while the split-plot cover crop treatment was established 14 years later in 2007 in the Conventional treatment, to allow a comparison of short and long-term cover crop presence.

In 2007, the organic management system was changed to a comparison of a perennial grain systems (perennial wheat-alfalfa intercrop) and a 4-yr rotation of corn/soybean/wheat/ alfalfa (Medicago sativa). This allows the comparison of a typical Michigan field crop organic system to a novel system that involves a new, perennial system.

Note

Experiment: Living Field Lab (LFL) Study
Data available from: January 1992 to January 2002
Dataset: KBS042
Datatable ID: KBS042-008.65
Repository link: http://doi.org/10.6073/pasta/76c22606a2a67cbca8f33149d3b5dfb6
Related Tables:
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Last Updated 2017-01-26
Variate Description Units
Year Year in which the date occurs
Plot Plot ID
Rep Field rep
Cover Cover crop present or not
Mgmnt Management type
Spring Crop Crop planted in the spring
Fall Crop Crop planted in the fall
Fertilizer App Date Date fertilizer was applied
Actual Amt The actual amount of each nutrient applied to each plot lb/ac
Material Amt The amount of fertilizer material applied to each plot
Fert Type The type of fertilizer applied as indicated by the content of each nutrient (Nitrogen-Phosphorus-Potassium)

Data Excerpt

year plot rep cover mgmnt spring_crop fall_crop fert_app_date actual_amt material_amt fert_type
2002 101 1 no cover conventional 2nd yr corn 2002-05-22 00:00:00 UTC 2.98 lbs/gal 10.6 lbs/gal 28% N
2002 101 1 no cover conventional 2nd yr corn 2002-06-27 00:00:00 UTC 110 lbs/a 28% N
2002 102 1 no cover conventional cont. corn 2002-06-27 00:00:00 UTC 110 lbs/a 28% N
2002 102 1 no cover conventional cont. corn 2002-05-22 00:00:00 UTC 2.98 lbs/gal 10.6 lbs/gal 28% N
2002 103 1 no cover conventional soybean wheat
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