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Methods for Experiment 097 -

Field Operations: Fencing

The plots in experiment E097 are enclosed by a fence to exclude mammalian herbivores. Galvanized welded-wire hardware cloth with 6mm x 6mm openings was buried to a depth of 84cm. Additional hardware cloth extends 60cm above the ground, and poultry netting extends to 1.8m above the ground. During the summer of 1986, aluminum flashing was placed in the ground to a depth of 12 inches. This flashing surrounds each plot in each field, keeping the plants from spreading between plots by belowground vegetative reproduction. The aluminum flashing is placed 12 inches from the edge of each plot.

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. For a list of fertilizer treatments for each plot, see file trmte02. Starting in the spring of 1992, 3 replicates of each nutrient treatment in fields A and C were randomly selected to receive no more fertilizer. For a list of treatments for each plot, see file trmte97.

Field Operations: Mammal Trapping

Small mammals are trapped as often as possible to keep the resident population low. A list of the number and kind of mammals taken from each field is in the small mammal documentation file. Pocket gophers are trapped out of the fields as soon as they appear. Gopher mounds are then removed and vegetation is unburied.

Sampling for E097

1992: E097 was sampled as part of E002. For sampling documentation see sampling for E002.
1993: E097 was sampled as part of E002. For sampling documentation see sampling for E002.

Treatment layout : trmte97

Note: Old nitrogen treatment codes 1 = 0g/m2/yr Ammonium Nitrate 2 = 3g/m2/yr 3 = 6g/m2/yr 4 = 10g/m2/yr 5 = 16g/m2/yr 6 = 28g/m2/yr 7 = 50g/m2/yr 8 = 80g/m2/yr 9 = 0g/m2/yr Treatment: 1 = Fertilized in the spring, 0 = Stop fertilizing

Field Identification Experiment Number Old N Treatment Code Plot Number Treatment
A971120
A971141
A971171
A971210
A971301
A971340
A97240
A972161
A972220
A972290
A972351
A972381
A973130
A973240
A973360
A973411
A973471
A973541
A97480
A974101
A974231
A974261
A974390
A974530
A97511
A975200
A975270
A975401
A975421
A975480
A97690
A976151
A976191
A976250
A976330
A976491
A977111
A977181
A977320
A977450
A977461
A977510
A97851
A978280
A978310
A978431
A978440
A978521
A97920
A97931
A97960
A97970
A979371
A979501
C971100
C971181
C971231
C971431
C971460
C971470
C972290
C972381
C972450
C972491
C972500
C972521
C973160
C973240
C973300
C973331
C973361
C973441
C97431
C974110
C974151
C974310
C974340
C974371
C97510
C97561
C97581
C975421
C975510
C975540
C97620
C97671
C976170
C976200
C976411
C976481
C97741
C977221
C977250
C977260
C977271
C977350
C97850
C978121
C978130
C978140
C978191
C978281
C97990
C979211
C979320
C979391
C979400
C979531