Journal article
Soil water and nitrogen dynamics in dryland cropping systems of Washington State, USA
Soil & tillage research, Vol.71(1), pp.33-47
2003
Handle:
https://hdl.handle.net/2376/108090
Abstract
Understanding the fate of soil water and nitrogen (N) is essential for improving crop yield and optimizing the management of water and N in dryland cropping systems. The objective of this study was to evaluate how conventional (CT) and no-till (NT) cropping systems affect soil water and N dynamics. Soil water and N were monitored in 30
cm increments to a depth of 1.5
m for 2 years at growers’ fields in two different agroclimatic zones of Washington State (USA): (1) the annual cropping region with a mean annual precipitation of more than 500
mm (Palouse site) and (2) the grain-fallow cropping region with mean precipitation below 350
mm (Touchet site). In each zone, a CT and a NT cropping system were chosen. All sites had an annual cropping system, except for the CT site in the drier area, which was under a traditional winter wheat/fallow rotation previous to the study. At Palouse, the volumetric water content in the top 1.5
m of the soil throughout the year was about 0.05–0.1
m
3
m
−3 less under CT as compared to NT, indicating improved seasonal accumulation and distribution of soil water under NT. Cropping systems modeling indicated, that during winter, surface runoff occurred in the CT system, but not under NT. The differences in soil water dynamics between CT and NT were mainly caused by differences in surface residues. Dynamics of NO
3
−-N at Palouse were similar for NT and CT. At Touchet, differences in soil moisture between NT and CT were less than 0.05
m
3
m
−3. Under NT, high levels of NO
3
−-N, up to 92
kg
NO
3-N
ha
−1, were found after harvest below the root zone between 1.5 and 2.5
m, and were attributed to inefficient use or over-application of fertilizer. In both climatic zones, grain yield was positively correlated with evapotranspiration.
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Details
- Title
- Soil water and nitrogen dynamics in dryland cropping systems of Washington State, USA
- Creators
- Juan P Fuentes - Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USAMarkus Flury - Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USADavid R Huggins - USDA-ARS Land Management and Water Conservation Research Unit, Pullman, WA 99164, USADavid F Bezdicek - Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USA
- Publication Details
- Soil & tillage research, Vol.71(1), pp.33-47
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- Elsevier B.V
- Identifiers
- 99900547019801842
- Language
- English
- Resource Type
- Journal article