Abstract
Abstract Improved soil‐water management techniques have made irrigated corn ( Zea mays L.) yields of more than 12.5 Mg ha −1 possible in the southeastern USA. Data relating fertilizer rates and soil test indices to grain yield under intensive water management are needed to maximize fertilizer use efficiency. The objective of this study was to generate fertility index‐yield response data from which critical levels of Mehlich 1 soil test P, K, and Mg could be calculated. Irrigated corn was grown at Quincy, FL during 1980 and 1981. Nitrogen was applied at 168, 336, and 504 kg ha −1 , P at 0, 29, 59, and 118 kg ha −1 , K at 0, 209, and 418 kg ha −1 , and Mg at 0, 67, and 134 kg ha −1 in a total of 11 treatments. Indices of available nutrients were measured via the Mehlich 1 soil test prior to each season. For both years, a minimum application of 168 kg ha −1 of N, 29 kg ha −1 of P, and 0 kg ha −1 of Mg was required for maximum grain yield, which averaged 11.2 Mg ha −1 . For K, maximum yield occurred with minimum applications of 209 and 0 kg ha −1 in 1980 and 1981, respectively. Calculated critical Mehlich 1 soil test levels were 9, 45, and 33 mg kg −1 for P, K, and Mg, respectively. Comparison of our results with current soil test rating categories and corresponding recommended fertilizer rates indicated that maximum corn yield was obtained with a P fertilizer rate which was 50 kg ha −1 lower than the recommended rate.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Minimum N application of 168 kg ha −1 was required for maximum grain yield in both years.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- 168 kg ha −1 of Ne0
- Outcome
- maximum grain yielde0
- Direction
- maximume0
- Value
- 11.2 Mg ha −1e0
- Qualifier
- For both yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For both years, a minimum application of 168 kg ha −1 of N, 29 kg ha −1 of P, and 0 kg ha −1 of Mg was required for maximum grain yield, which averaged 11.2 Mg ha −1”
t0“Irrigated Corn”
Claim · model-written summary
Minimum P application of 29 kg ha −1 was required for maximum grain yield in both years.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- 29 kg ha −1 of Pe0
- Outcome
- maximum grain yielde0
- Direction
- maximume0
- Value
- 11.2 Mg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For both years, a minimum application of 168 kg ha −1 of N, 29 kg ha −1 of P, and 0 kg ha −1 of Mg was required for maximum grain yield, which averaged 11.2 Mg ha −1”
t0“Irrigated Corn”
Claim · model-written summary
No Mg application was required for maximum grain yield in both years.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- 0 kg ha −1 of Mge0
- Outcome
- maximum grain yielde0
- Direction
- maximume0
- Value
- 11.2 Mg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For both years, a minimum application of 168 kg ha −1 of N, 29 kg ha −1 of P, and 0 kg ha −1 of Mg was required for maximum grain yield, which averaged 11.2 Mg ha −1”
t0“Irrigated Corn”
Claim · model-written summary
In 1980, minimum K application for maximum yield was 209 kg ha −1.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Ke0
- Outcome
- maximum yielde0
- Direction
- maximume0
- Value
- 209e0
- Qualifier
- 1980e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For K, maximum yield occurred with minimum applications of 209 and 0 kg ha −1 in 1980 and 1981, respectively”
t0“Irrigated Corn”
Claim · model-written summary
In 1981, minimum K application for maximum yield was 0 kg ha −1.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Ke0
- Outcome
- maximum yielde0
- Direction
- maximume0
- Value
- 0 kg ha −1e0
- Qualifier
- 1981e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For K, maximum yield occurred with minimum applications of 209 and 0 kg ha −1 in 1980 and 1981, respectively”
t0“Irrigated Corn”
Claim · model-written summary
Critical Mehlich 1 soil-test P level was 9 mg kg −1.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- critical Mehlich 1 soil test levelse0
- Value
- 9e0
- Qualifier
- Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calculated critical Mehlich 1 soil test levels were 9, 45, and 33 mg kg −1 for P, K, and Mg, respectively”
t0“Irrigated Corn”
Claim · model-written summary
Critical Mehlich 1 soil-test K level was 45 mg kg −1.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- critical Mehlich 1 soil test levelse0
- Value
- 45e0
- Qualifier
- Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calculated critical Mehlich 1 soil test levels were 9, 45, and 33 mg kg −1 for P, K, and Mg, respectively”
t0“Irrigated Corn”
Claim · model-written summary
Critical Mehlich 1 soil-test Mg level was 33 mg kg −1.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- critical Mehlich 1 soil test levelse0
- Value
- 33 mg kg −1e0
- Qualifier
- Mge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calculated critical Mehlich 1 soil test levels were 9, 45, and 33 mg kg −1 for P, K, and Mg, respectively”
t0“Irrigated Corn”
Claim · model-written summary
Maximum corn yield was obtained with a P fertilizer rate 50 kg ha −1 below the recommended rate.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- P fertilizer ratee0
- Outcome
- maximum corn yielde0
- Direction
- maximume0
- Value
- 50 kg ha −1e0
- Comparator
- the recommended ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum corn yield was obtained with a P fertilizer rate which was 50 kg ha −1 lower than the recommended rate”
The same questions in other papers
magnesium atom · yield · Zea mays (maize)Results differ
10 papers in the same direction as this paper · 36 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
43 papers more in this group
See all 47 papers →potassium · yield · Zea mays (maize)Positive and negative results
290 papers in the same direction as this paper · 28 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- negative
316 papers more in this group
See all 320 papers →fertilization · yield · Zea mays (maize)Positive and negative results
3,484 papers in the same direction as this paper · 338 in the opposite direction · 85 reporting no difference from an alternative
- positive
- positive
- positive
3,904 papers more in this group
See all 3,908 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.