masslost {lgrdata}

Genetically modified soybean litter decomposition

Description

Soybean litter decomposition as a function of time (date), type of litter (variety), herbicides applied (herbicide), and where in the soil profile it is placed (profile). masslost refers to the proportion of the litter that was lost from the bag (decomposed) relative to the start of the experiment. Herbicide treatments were applied at the level of whole plots, with both treatments represented within each of four blocks. Both levels of variety and profile were each represented within each plot, with six replicates of each treatment added to each plot.

Usage

masslost

Format

A data frame with 246 rows and 8 variables:

plot

integer A total of eight plots.

block

integer A total of four blocks.

variety

integer Soybean variety is genetically modified ('gm') or not ('nongm'); manipulated at the subplot level.

herbicide

integer Herbicide applied is glyphosate ('gly') or conventional program ('conv'); manipulated at plot level.

profile

integer Whether litter was 'buried' in the soil or placed at the soil 'surface'; manipulated at the subplot level.

date

integer Date at which litter bags were recovered.

sample

integer Factor representing timing of sampling ('incrop1', 'incrop2', 'postharvest').

masslost

double The proportion of the initial mass that was lost from each litter bag during field incubation. Some values are lower than zero due to insufficient washing of dirt and biota from litter prior to weighing.

Source

Jeff Powell