Abstract
Field experiments were conducted in 1986 through 1988 to evaluate the effects of rates and timing of ethephon application on growth, yield, and lodging of `Jubilee' sweet corn (Zea mays L.). As a comparison, hand-topping was performed 10 days after early silking to simulate the commercial practice of mechanical topping to reduce lodging. Ethephon reduced plant height by 12% to 26%, with timing of application determining location of internode length reductions. There was greater reduction of ear height by ethephon applied at tassel elongation (TE) than at 1 and 2 weeks later. Effects of ethephon on husked yield varied from an 8% increase in yield to an 18% decrease, depending on rate, timing, and season. Topping reduced yield in one of the four experiments. Ear length was reduced by ethephon at 0.28 kg·ha -1 in two of the four experiments. A helicopter fly-over resulted in 66% of topped plants lodging, compared to 87% of untreated plants. Lodging of plants that received an ethephon application of 0.28 kg·ha -1 at TE averaged 51% for Expts. 2, 3, and 4. The amount of lodging tended to be least in those ethephon treatments with the largest reduction `in plant or ear height. Chemical names used: 2-chloroethyl phosphonic acid (ethephon).
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Claims 9
Claim · model-written summary
Ethephon reduced plant height by 12% to 26%.
Not reportedComparator
Verbatim
e0“Ethephon reduced plant height by 12% to 26%”
e1“sweet corn (Zea mays L.)”
Claim · model-written summary
Application timing determined where internode lengths fell.
Not reportedComparator
Verbatim
e0“timing of application determining location of internode length reductions”
e1“Ethephon reduced plant height”
e2“sweet corn (Zea mays L.)”
Claim · model-written summary
Ethephon at tassel elongation reduced ear height more than applications one or two weeks later.
Verbatim
e0“greater reduction of ear height by ethephon applied at tassel elongation (TE) than at 1 and 2 weeks later”
e1“sweet corn (Zea mays L.)”
Claim · model-written summary
Ethephon changed husked yield from an 8% increase to an 18% decrease across rates, timings and seasons.
- Taxon
- sweet corne1
- Treatment
- ethephone0
- Outcome
- husked yielde0
- Value
- 8% increase in yield to an 18% decreasee0
Not reportedComparatorDirection
Verbatim
e0“Effects of ethephon on husked yield varied from an 8% increase in yield to an 18% decrease, depending on rate, timing, and season”
e1“sweet corn (Zea mays L.)”
Claim · model-written summary
Topping reduced yield in one of four experiments.
- Taxon
- sweet corne1
- Treatment
- Toppinge0
- Outcome
- yielde0
- Direction
- reducede0
- Qualifier
- one of the four experimentse0
Not reportedComparator
Verbatim
e0“Topping reduced yield in one of the four experiments”
e1“sweet corn (Zea mays L.)”
Claim · model-written summary
Ethephon at 0.28 kg·ha -1 reduced ear length in two of four experiments.
- Taxon
- sweet corne1
- Treatment
- ethephon at 0.28 kg·ha -1e0
- Outcome
- Ear lengthe0
- Direction
- reducede0
- Qualifier
- two of the four experimentse0
Not reportedComparator
Verbatim
e0“Ear length was reduced by ethephon at 0.28 kg·ha -1 in two of the four experiments”
e1“sweet corn (Zea mays L.)”
Claim · model-written summary
After a helicopter fly-over, 66% of topped plants lodged compared with 87% untreated.
- Taxon
- sweet corne1
- Treatment
- topped plantse0
- Outcome
- plants lodginge0
- Value
- 66%e0
- Qualifier
- 87%e0
- Comparator
- untreated plantse0
Not reportedDirection
Verbatim
e0“A helicopter fly-over resulted in 66% of topped plants lodging, compared to 87% of untreated plants”
e1“sweet corn (Zea mays L.)”
Claim · model-written summary
Lodging averaged 51% under ethephon at 0.28 kg·ha -1 at tassel elongation in experiments 2–4.
Not reportedDirection
Verbatim
e0“Lodging of plants that received an ethephon application of 0.28 kg·ha -1 at TE averaged 51% for Expts. 2, 3, and 4”
e1“sweet corn (Zea mays L.)”
Claim · model-written summary
Lodging tended to be least with ethephon treatments giving the largest plant or ear height reduction.
Verbatim
e0“The amount of lodging tended to be least in those ethephon treatments with the largest reduction `in plant or ear height”
e1“sweet corn (Zea mays L.)”
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