Abstract
Abstract Corn (Zea mays L.) was grown for six consecutive years, beginning in 1966, on Groseclose silt loam to determine the effects of fertilization on leaf composition, yields, and on the changes in available K in the soil. Plant nutrients consisting of five levels each of N, P and K were applied annually in a central composite rotatable design. All plant residue was removed each year when the corn was harvested and the plots were seeded without fertilization to rye as a cover crop. The available K content in the 0‐to 15‐cm soil depth decreased rapidly during the first three years with all levels of applied K but the rate of decrease lessened after the third year with the highest rate of applied K. Plots receiving 0 and 28 kg K/ha contained in the 0‐to 120‐cm depth in 1972, 87 and 95% as much available K, respectively, as plots treated with the highest rate of K. Corn did not respond to K fertilization. The K concentration was highest in leaves from plots untreated with K and in silage from plots receiving the highest amount of K. Key words: silage yieldsgrain yieldsK concentration
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Claims 7
Claim · model-written summary
Available topsoil potassium declined rapidly for three years at all applied potassium levels.
Not reportedTaxon
Verbatim
e0“The available K content in the 0‐to 15‐cm soil depth decreased rapidly during the first three years with all levels of applied K”
Claim · model-written summary
The decline in available potassium slowed after year three at the highest potassium rate.
Not reportedTaxon
Verbatim
e0“the rate of decrease lessened after the third year with the highest rate of applied K.”
Claim · model-written summary
Zero-potassium plots had 87% as much available potassium as the highest-rate plots in 1972.
Not reportedTaxon
Verbatim
e0“Plots receiving 0 and 28 kg K/ha contained in the 0‐to 120‐cm depth in 1972, 87 and 95% as much available K, respectively, as plots treated with the highest rate of K.”
Claim · model-written summary
Plots receiving 28 kg K/ha had 95% as much available potassium as highest-rate plots.
Not reportedTaxon
Verbatim
e0“Plots receiving 0 and 28 kg K/ha contained in the 0‐to 120‐cm depth in 1972, 87 and 95% as much available K, respectively, as plots treated with the highest rate of K.”
Claim · model-written summary
Corn did not respond to potassium fertilization.
- Taxon
- Corn
Zea mays subsp. mayse0 - Treatment
- K fertilizatione0
- Outcome
- responde0
- Direction
- did not responde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn did not respond to K fertilization.”
Claim · model-written summary
Leaf potassium concentration was highest without potassium fertilizer.
Not reportedTaxon
Verbatim
e0“The K concentration was highest in leaves from plots untreated with K”
Claim · model-written summary
Silage potassium concentration was highest at the highest potassium application rate.
Not reportedTaxon
Verbatim
e0“The K concentration was highest in leaves from plots untreated with K and in silage from plots receiving the highest amount of K.”