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Restoring Productivity on Pullman Silty Clay Loam Subsoil under Limited Moisture
Author(s) -
Eck Harold V.
Publication year - 1969
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1969.03615995003300040028x
Subject(s) - topsoil , subsoil , loam , environmental science , agronomy , water content , soil water , soil fertility , moisture , nutrient , sorghum , water use efficiency , fertilizer , irrigation , soil science , chemistry , geology , biology , geotechnical engineering , organic chemistry
Applied fertilizer restored grain sorghum ( Sorghum vulgare ) yields on 10‐cm cut Pullman silty clay loam to 93% of those obtained on uncut soil. On 20‐, 30‐, and 41‐cm cuts, yields were restored to 87% of those on uncut soil. Soil water storage, water use, and water‐use efficiency data revealed that differences in soil water storage and use were responsible for differences in yield when fertility was not limiting. Topsoil removal decreased and fill increased water‐holding capacity of the soil profile. Topsoil removal decreased water loss from fallowed soil, but fill had little effect. N was the only added nutrient required to produce highest yields obtained under limited moisture conditions in this study. Inadequately fertilized treatments used less water than adequately fertilized ones, but water‐use efficiency was greater where plant nutrients were adequate.