Abstract
Abstract Genetic improvements for increased grain yield through selection for prolificacy in corn ( Zea mays L.) may affect plant responses to fertilizers. A field study was conducted on a Dothan loamy sand (Typic Plinthic Paleudult) to determine the effects of N and K rates on growth, grain yield, and concentrations of N, K, Ca, and Mg in the leaves of corn genotypes differing in average ear production. Nitrogen rates of 50, 150, and 250 kg N ha −1 and K rates of 0, 50, and 100 kg K ha −1 were used in factorial combination with prolific (Pr), semi‐prolific (SP), and nonprolific (NP) genotypes at plant densities of 34 000 and 68 000 plants ha −1 . Leaf weight and grain yield of all three genotypes were increased with N fertilization. Response above 150 kg N ha −1 was relatively small. Yield response to K was obtained at 150 kg N ha~' but not at 250 kg N ha −1 in a year with optimum conditions for yield. Lack of K response at the high N rate was a result of greater uptake of soil K. Nitrogen rate had a greater effect on K uptake than K rate. Leaf concentrations of Ca, Mg, and K increased with N rates and were greatest with the Pr and SP genotypes. The Pr and SP genotypes had considerably higher leaf concentrations of Ca and Mg and total cation concentration than the NP genotype. However, the NP genotype had the highest leaf N concentration. Increasing K rates decreased Ca and Mg concentrations in the leaves but had little effect on total cation concentration.
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Claims 15
Claim · model-written summary
N fertilization increased leaf weight in all three corn genotypes.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- N fertilizatione0
- Outcome
- Leaf weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf weight and grain yield of all three genotypes were increased with N fertilization.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
N fertilization increased grain yield in all three corn genotypes.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- N fertilizatione0
- Outcome
- grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf weight and grain yield of all three genotypes were increased with N fertilization.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Response above 150 kg N ha −1 was relatively small.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- Responsee0
- Qualifier
- above 150 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Response above 150 kg N ha −1 was relatively small.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Yield responded to K at 150 kg N ha~' in a year with optimum yield conditions.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Ke0
- Outcome
- Yield responsee0
- Qualifier
- 150 kg N ha~'e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield response to K was obtained at 150 kg N ha~' but not at 250 kg N ha −1 in a year with optimum conditions for yield.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Yield did not respond to K at 250 kg N ha −1.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Ke0
- Outcome
- Yield responsee0
- Direction
- but note0
- Qualifier
- 250 kg N ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield response to K was obtained at 150 kg N ha~' but not at 250 kg N ha −1 in a year with optimum conditions for yield.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
The authors attributed the lack of K response at high N to greater uptake of soil K.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- Lack of K responsee0
- Qualifier
- greater uptake of soil Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lack of K response at the high N rate was a result of greater uptake of soil K.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
N rate affected K uptake more than K rate.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Nitrogen ratee0
- Outcome
- K uptakee0
- Direction
- greatere0
- Comparator
- K ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rate had a greater effect on K uptake than K rate.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Leaf Ca concentration increased with N rate.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- N ratese0
- Outcome
- Leaf concentrations of Cae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf concentrations of Ca, Mg, and K increased with N rates”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Leaf Mg concentration increased with N rate.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- N ratese0
- Outcome
- Leaf concentrations of Ca, Mg, and Ke0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf concentrations of Ca, Mg, and K increased with N rates”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Leaf K concentration increased with N rate.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- N ratese0
- Outcome
- Leaf concentrations of Ca, Mg, and Ke0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf concentrations of Ca, Mg, and K increased with N rates”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Pr and SP genotypes had higher leaf Ca and Mg and total cation concentration than NP.
- Taxon
- cornZea mays subsp. mayse1
- Material
- Pr and SP genotypese0
- Outcome
- leaf concentrations of Ca and Mg and total cation concentratione0
- Direction
- considerably highere0
- Comparator
- NP genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Pr and SP genotypes had considerably higher leaf concentrations of Ca and Mg and total cation concentration than the NP genotype.”
e1“corn ( Zea mays L.)”
Claim · model-written summary
NP had the highest leaf N concentration.
- Taxon
- cornZea mays subsp. mayse1
- Material
- NP genotypee0
- Outcome
- leaf N concentratione0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the NP genotype had the highest leaf N concentration”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Increasing K rate decreased leaf Ca concentration.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Increasing K ratese0
- Outcome
- Ca and Mg concentrations in the leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing K rates decreased Ca and Mg concentrations in the leaves”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Increasing K rate decreased leaf Mg concentration.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Increasing K ratese0
- Outcome
- Ca and Mg concentrations in the leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing K rates decreased Ca and Mg concentrations in the leaves”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Increasing K rate had little effect on total cation concentration.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Increasing K ratese0
- Outcome
- total cation concentratione0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing K rates decreased Ca and Mg concentrations in the leaves but had little effect on total cation concentration.”
e1“corn ( Zea mays L.)”
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