Effects of Tillage on Along-Row Variability of Wheat and Maize Biomass
Spatial variability of wheat and maize biomass was studied under two tillage systems, minimum tillage (MT) and conventional moldboard plowing (CT). The above-ground biomass data were collected from 10 locations separated at 5 m intervals along the crop rows. The range of semivariogram, estimated by...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2003-01-01
|
| Series: | Plant Production Science |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1626/pps.6.295 |
| Summary: | Spatial variability of wheat and maize biomass was studied under two tillage systems, minimum tillage (MT) and conventional moldboard plowing (CT). The above-ground biomass data were collected from 10 locations separated at 5 m intervals along the crop rows. The range of semivariogram, estimated by fitting a linear model to observed semivariances, was used to investigate spatial dependence. A range of > 5 m was regarded as the existence of spatial dependence and that of < 5 m as the non-existence of spatial dependence. The frequencies of existence of spatial dependence were 46% and 63% under MT and CT, respectively, in wheat and 13% and 42%, respectively, in maize. Spatial dependence appeared more frequently under CT than under MT. Wheat showed spatial depen-dence more frequently and had a longer range than maize. Spatial dependence was unstable and variable with the year even on the same sampling lines. The origin of tillage-induced spatial dependence and its possible role in precision farming are discussed. |
|---|---|
| ISSN: | 1343-943X 1349-1008 |