uid=KBS,o=lter,dc=ecoinformatics,dc=orgalluid=sbohm,o=lter,dc=ecoinformatics,dc=orgallpublicreadhttps://lter.kbs.msu.edu/datasets/126.emlNicholasHaddadMichigan State University

3700 E Gull Lake DriveHickory Corners49060US

haddad@kbs.msu.edu0000-0002-1591-9322JustinKunkle

United States

(517) 285-1260kunkleju@msu.eduG.RobertsonMichigan State University

3700 East Gull Lake DriveHickory CornersMI49060US

(269) 760-8364(269)671-2351robert30@msu.edu0000-0001-9771-9895original investigatorStaceyVanderWulpMichigan State University

3700 East Gull Lake DriveHickory CornersMI49060US

(269) 671-2339(269) 671-2333vanderws@msu.eduprincipal contact2026-05-20

original data source http://lter.kbs.msu.edu/datasets/126

LTERKBSKellogg Biological StationHickory CornersMichiganGreat LakestraitInorganic NutrientsPrimary ProductionLTER Core Research Areafarmingbiotahttps://apps.usgs.gov/thesaurus/thesaurus-full.php?thcode=15Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director. These restrictions are intended mainly to preserve the primary investigators' rights to first publication and to ensure that data users are aware of the limitations that may be associated with any specific data set. These restrictions apply to both the baseline data set and to the data sets associated with specific LTER-supported subprojects.All publications of KBS data and images must acknowledge KBS LTER support.The areas around the Kellogg Biological Station in southwest Michigan-85.404699-85.36685742.42026542.3910192011-07-142018-03-18Kellogg Biological StationData Managerlter.data.manager@kbs.msu.eduhttp://lter.kbs.msu.edu02vkce854KBS LTERMicroplots were established in the northern 15 meters of each Poplar treatment (T5) replicate plot (R1-R6) of the LTER Main Cropping System Experiment (MCSE) in 2010, coincident with planting of NM-6 (Populus nigra x populus maximowiczii) in 2009, to examine the effects of nitrogen fertilization on poplar growth and production. Six different microplot treatments (N1-N6; see figure below), varying in N fertilizer application rates and frequency, were randomly assigned to individual microplots in each replicate (see table below). Although six treatments were originally intended, only five treatments (N1-N5) were fully executed: N1 = 0 lbs N/acre N2 = 50 lbs N/acre; applied once in 2011 N3 = 100 lbs N/acre; applied once in 2011 N4 = 50 lbs N/acre; applied annually 2011-2017 N5 = 100 lbs N/acre; applied annually 2011-2017 N6 = 100 lbs N/acre; applied once in the year prior to harvest; but did not occur, so N6 = 0 lbs N/acre Poplar cuttings were planted May 12-13, 2009 at a density of 1,089 trees/acre (8 feet between rows and 5 feet between trees), spot replanted April 15-19, 2010, and harvested March 8-18, 2018. Data Managerhttp://lter.kbs.msu.edu/protocols/141To measure the plant total C and N, plant material is oven dried, finely ground, packed in tin foil capsules, combusted in an automated CHN analyzer, and expressed as the percentage of element in dried plant material. Sampling frequency: Depends on experiment and research objective. For example, as part of our sampling program of the LTER Main Cropping System Experiment, C and N are determined annually in plant materials harvested at peak biomass for annual net primary production (ANPP).Data Managerhttp://lter.kbs.msu.edu/protocols/40programNational Science Foundationhttp://dx.doi.org/10.13039/100000001DEB 2224712https%3A%2F%2Fnsf.gov%2Fawardsearch%2FshowAward%3FAWD_ID%3D2224712%26HistoricalAwards%3Dfalsehttps://lter.kbs.msu.edu/datatables/393Kellogg Biological Station LTER: Leaf Nutrient Analyses of Poplar N Fertilization Study (KBS100-001)Plant total carbon and nitrogen content and complete nutrient analyses of new growth leaves of poplar trees in MCSE T5 fertilizer study microplots. Total carbon and nitrogen were measured at KBS; remaining nutrients measured by MSU Plant and Soil Nutrient Laboratory.Leaf+Nutrient+Analyses+of+Poplar+N+Fertilization+Study.csvNone381\ncolumn,no"\https://lter.kbs.msu.edu/datatables/393.csvsample_datedate the leaf sample was takenYYYY-MM-DD11987-4-18treatmentLTER MSCE treatmentLTER MSCE treatmentreplicateLTER MSCE replicateLTER MSCE replicatemicroplotmicroplot name. Indicates the level of fertilization.microplot name. Indicates the level of fertilization.nitrogen_percentpercent nitrogen gramsPerHectogramrealcarbon_percentpercent carbongramsPerHectogramrealsulfur_percentpercent sulfurgramsPerHectogramrealphosphorus_percentpercent phosphorusgramsPerHectogramrealpotassium_percentpercent potassiumgramsPerHectogramrealmagnesium_percentpercent magnesiumgramsPerHectogramrealcalcium_percentpercent calciumgramsPerHectogramrealsodium_percentpercent sodiumgramsPerHectogramrealboron_ppmppm boronmicrogramsPerGramrealzinc_ppmppm zincmicrogramsPerGramrealmanganese_ppmppm manganesemicrogramsPerGramrealiron_ppmppm ironmicrogramsPerGramrealcopper_ppmppm coppermicrogramsPerGramrealaluminum_ppmppm aluminummicrogramsPerGramrealhttps://lter.kbs.msu.edu/datatables/583Kellogg Biological Station LTER: Stem Diamters of Poplar N Fertilization Study (kbs100-002)The basal diameter of the marked poplar trees in the center section of MCSE T5 fertilizer study microplots, measured at 15 cm above the ground from 2011 to 2017.Stem+Diamters+of+Poplar+N+Fertilization+Study.csvNone261\ncolumn,no"\https://lter.kbs.msu.edu/datatables/583.csvsample_datesample dateYYYY-MM-DD11987-4-18treatmenttreatmenttreatmentreplicatereplicatereplicatemicroplottreatment microplottreatment microplottree_idthe tree to be measuredthe tree to be measureddiameter_cmthe tree diameter measured at 15 cm above the groundcentimeterrealcommentcomments about the measurementcomments about the measurementhttps://lter.kbs.msu.edu/datatables/604Kellogg Biological Station LTER: Yields of Poplar N Fertilization Study (KBS100-004)Yields, in dry matter, of clear-cut harvested poplars in the MCSE T5 fertilizer study microplots.Yields+of+Poplar+N+Fertilization+Study.csvNone251\ncolumn,no"\https://lter.kbs.msu.edu/datatables/604.csvsample_datethe sample (or harvest) dateYYYY-MM-DD11987-4-18treatmentthe MCSE treatmentthe MCSE treatmentreplicatethe MCSE replicate plotthe MCSE replicate plotmicroplotthe fertilizer microplot idthe fertilizer microplot idmoisturethe moisture at harvestgramsPerGramrealyield_mg_habiomass yield (Mg/ha)megagramsPerHectarereal