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University of Minnesota
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Methods for Experiment 060 -

Animal Sampling Methods

Grasshoppers are sampled. Grasshopper densities are sampled in a 10m x 10m portion of the macroplot adjacent to the grasshopper cages. The density of each grasshopper species compared with that in the cages was the average over three macroplots within a fertilizer treatment. For a list of species and their taxon codes, see file ghoppers.lst.

Field Operations: Additional notes

On May 5, 1995, a wildfire burned all the plots in experiment 60 in field B.

Field Operations: Cages

Forty eight windowscreen cages (40cm x 40cm at the base and 122cm tall) were placed over existing vegetation in the macroplots in Field B ( E004).

Field Operations: Fertilization

Fertilizer is mixed and spread by hand twice a year, once in early May and once in late June. Each plot gets the fertilizer mixture specified by its fertilizer treatment code.

Sampling for B060

In 1989, at the termination of the experiment, grasshopper densities were sampled in a 10m x 10m portion of the macroplot adjacent to the grasshopper cages. The density of each grasshopper species compared with that in the cages was the average over three macroplots within a fertilizer treatment. Vegetation was sampled after cages were pulled up within the 40cm x 40cm area contained by the cage. All plants within the 40cm x 40cm area were clipped. Plants were sorted to species, dried at 45 degrees C and weighed. Vegetation was sampled in 1990 in the same way as in 1989.

Treatment layout : trmte60

Grasshopper Treatment: 1 = one grasshopper species by itself 2 = a 2nd grasshopper species by itself 3 = both grasshopper species combined 4 = no grasshoppers

Field Identification Experiment Number Plot Number Macroplot Number Nitrogen Treatment Ammonium Nitrate(34-0-0) addition(g/m2/yr) Grasshopper Treatment Grasshopper ID code Initial density Season
B6016I03333Early
B6016I031913Early
B6026I021914Early
B6036I021914Early
B6046I01335Early
B6056I01335Early
B6066I03333Early
B6066I031913Early
B6072I021914Early
B6082I01335Early
B6092I03333Early
B6092I031913Early
B60102I021914Early
B60112I03333Early
B60112I031913Early
B60122I01335Early
B60133I01335Early
B60143I021914Early
B60153I03333Early
B60153I031913Early
B60163I021914Early
B60173I03333Early
B60173I031913Early
B60183I01335Early
B60197G503333Early
B60197G5031913Early
B60207G5021914Early
B60217G501335Early
B60227G503333Early
B60227G5031913Early
B60237G5021914Early
B60247G501335Early
B60254G501335Early
B60264G5021914Early
B60274G5021914Early
B60284G503333Early
B60284G5031913Early
B60294G501335Early
B60304G503333Early
B60304G5031913Early
B603110G503333Early
B603110G5031913Early
B603210G503333Early
B603210G5031913Early
B603310G5021914Early
B603410G501335Early
B603510G5021914Early
B603610G501335Early
B60376I0400Early
B60386I0400Early
B60392I0400Early
B60402I0400Early
B60413I0400Early
B60423I0400Early
B60437G50400Early
B60447G50400Early
B60454G50400Early
B60464G50400Early
B604710G50400Early
B604810G50400Early
B6016I01164Late
B6026I01164Late
B6036I0400Late
B6046I02116Late
B6056I0400Late
B6066I03163Late
B6066I03114Late
B6076I02116Late
B6086I03163Late
B6086I03114Late
B6092I01164Late
B60102I03163Late
B60102I03114Late
B60112I02116Late
B60122I03163Late
B60122I03114Late
B60132I0400Late
B60142I01164Late
B60152I02116Late
B60162I0400Late
B60173I03163Late
B60173I03114Late
B60183I01164Late
B60193I0400Late
B60203I02116Late
B60213I0400Late
B60223I01164Late
B60233I03163Late
B60233I03114Late
B60243I02116Late
B60257G50400Late
B60267G502116Late
B60277G501164Late
B60287G503163Late
B60287G503114Late
B60297G50400Late
B60307G503163Late
B60307G503114Late
B60317G501164Late
B60327G502116Late
B60334G502116Late
B60344G501164Late
B60354G50400Late
B60364G503163Late
B60364G503114Late
B60374G502116Late
B60384G503163Late
B60384G503114Late
B60394G501164Late
B60404G50400Late
B604110G50400Late
B604210G501164Late
B604310G50400Late
B604410G503163Late
B604410G503114Late
B604510G502116Late
B604610G503163Late
B604610G503114Late
B604710G502116Late
B604810G501164Late