Abstract
Abstract Sorghum [ Sorghum bicolor (L.) Moench] often becomes iron deficient when grown on calcareous iron‐deficient soils. Two experimental sites were selected with a history of severe iron chlorosis on sorghum to the point of plant death before maturity. Correcton of the Holloman soil (fine‐loamy, gypsic, thermic, shallow Typic Torriorthent) has not been practical with available treatments. A 5‐yr experiment consisting of sludge (89.6 Mg/ha) and dairy manure (89.6 Mg/ha), each applied the first year only, plus a fertilized check with N and P applied annually was conducted on one site. A 3‐yr experiment comparing two rates (33.6 and 67.2 Mg/ha) of sludge applied only the first year plus a fertilized check with N and P applied annually was conducted on the second site. Sludge was applied to half of each sludge plot the last year of each experiment to evaluate residual effects of sludge applied at the beginning. In both experiments, grain yields were low on the fertilized check plots and on the manure treatments after the first year. Sludge improved yields and soil test Fe levels, and corrected sorghum chlorosis throughout both experiments. For at least 5 yr following application, sludge also increased soil test levels of Zn and P.
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Claims 5
Claim · model-written summary
Grain yields were low on fertilized check plots and on manure treatments after the first year.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yields were low on the fertilized check plots and on the manure treatments after the first year”
t0“Sorghum”
Claim · model-written summary
Sludge improved yields.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sludge improved yields and soil test Fe levels, and corrected sorghum chlorosis throughout both experiments”
Claim · model-written summary
Sludge improved soil test Fe levels.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sludge improved yields and soil test Fe levels, and corrected sorghum chlorosis throughout both experiments”
Claim · model-written summary
Sludge corrected sorghum chlorosis throughout both experiments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sludge improved yields and soil test Fe levels, and corrected sorghum chlorosis throughout both experiments”
Claim · model-written summary
Sludge increased soil test Zn and P for at least five years.
- Treatment
- sludgee0
- Outcome
- soil test levels of Zn and Pe0
- Direction
- increasede0
- Qualifier
- at least 5 yr following applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For at least 5 yr following application, sludge also increased soil test levels of Zn and P”
t0“Sorghum”
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