Abstract
Sweet corn (Zea mays L. var. rugosa cv. Jubilee) was grown on a fine loamy clay krasnozem soil with banded nitrogen fertilizer at rates up to 200 kg N ha-1 from (NH4)2SO4 and 50 kg N ha-1 from each of NH4NO3 and urea. Some treatments were top-dressed with one or two applications of 50 kg N ha-1. The highest yield of both cobs (23.1 t ha-1) and fresh shoots (93.8 t ha-1) and the highest concentration of N in cobs and shoot dry matter was attained with 100 kg basal N ha-1 and two subsequent topdressings of 50 kg N ha-1 each, applied as (NH4)2SO4. From banded dressing alone, 150 kg N ha-1 produced the highest cob yield and the highest accumulation of N in cobs and shoot dry matter. Top-dressed N increased the yield of cobs and the yield and N concentration in shoots, but did not influence the N concentration in cobs. As N rates were increased, there was an increase in the weight of primary cobs, the weight and number of secondary cobs and more significantly, in the number of tertiary cobs. The source of N did not have any effect on the yield or most yield related components except yield and number of tertiary cobs, which were higher in the ammonium sulfate treatments. The contribution of nitrogen uptake efficiency NUPE and nitrogen ultilization efficiency NUTE to variations in nitrogen use efficiency NUSE was calculated and discussed.
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Claims 10
Claim · model-written summary
A basal 100 kg nitrogen rate with two topdressings maximized cob yield at 23.1 t ha-1.
- Taxon
- cobse0
- Treatment
- 100 kg basal N ha-1 and two subsequent topdressings of 50 kg N ha-1 eache0
- Outcome
- yield of both cobse0
- Direction
- higheste0
- Value
- 23.1 t ha-1e0
Not reportedComparator
Verbatim
e0“The highest yield of both cobs (23.1 t ha-1) and fresh shoots (93.8 t ha-1) and the highest concentration of N in cobs and shoot dry matter was attained with 100 kg basal N ha-1 and two subsequent topdressings of 50 kg N ha-1 each, applied as (NH4)2SO4”
Claim · model-written summary
The same nitrogen regime maximized fresh shoot yield at 93.8 t ha-1.
- Taxon
- Sweet cornt0
- Treatment
- 100 kg basal N ha-1 and two subsequent topdressings of 50 kg N ha-1 eache0
- Outcome
- fresh shootse0
- Direction
- higheste0
- Value
- 93.8 t ha-1e0
Not reportedComparator
Verbatim
e0“The highest yield of both cobs (23.1 t ha-1) and fresh shoots (93.8 t ha-1) and the highest concentration of N in cobs and shoot dry matter was attained with 100 kg basal N ha-1 and two subsequent topdressings of 50 kg N ha-1 each, applied as (NH4)2SO4”
t0“Sweet corn”
Claim · model-written summary
The same regime maximized nitrogen concentration in cobs and shoot dry matter.
- Taxon
- Sweet cornt0
- Treatment
- 100 kg basal N ha-1 and two subsequent topdressings of 50 kg N ha-1 eache0
- Outcome
- concentration of N in cobs and shoot dry mattere0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“the highest concentration of N in cobs and shoot dry matter was attained with 100 kg basal N ha-1 and two subsequent topdressings of 50 kg N ha-1 each, applied as (NH4)2SO4”
t0“Sweet corn”
Claim · model-written summary
A banded 150 kg N ha-1 dressing maximized cob yield.
Not reportedComparator
Verbatim
e0“From banded dressing alone, 150 kg N ha-1 produced the highest cob yield and the highest accumulation of N in cobs and shoot dry matter”
t0“Sweet corn”
Claim · model-written summary
A banded 150 kg N ha-1 dressing maximized nitrogen accumulation in cobs and shoots.
- Taxon
- Sweet cornt0
- Treatment
- 150 kg N ha-1e0
- Outcome
- accumulation of N in cobs and shoot dry mattere0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“From banded dressing alone, 150 kg N ha-1 produced the highest cob yield and the highest accumulation of N in cobs and shoot dry matter”
t0“Sweet corn”
Claim · model-written summary
Topdressed nitrogen increased cob and shoot yields and shoot nitrogen concentration.
- Taxon
- Sweet cornt0
- Treatment
- Top-dressed Ne0
- Outcome
- yield of cobs and the yield and N concentration in shootse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Top-dressed N increased the yield of cobs and the yield and N concentration in shoots”
t0“Sweet corn”
Claim · model-written summary
Topdressed nitrogen did not change nitrogen concentration in cobs.
- Taxon
- Sweet cornt0
- Treatment
- Top-dressed Ne0
- Outcome
- N concentration in cobse0
- Direction
- did not influencee0
Not reportedComparator
Verbatim
e0“Top-dressed N increased the yield of cobs and the yield and N concentration in shoots, but did not influence the N concentration in cobs”
t0“Sweet corn”
Claim · model-written summary
Higher nitrogen rates increased primary cob weight, secondary cob weight and number, and tertiary cob number.
- Taxon
- Sweet cornt0
- Treatment
- N ratese0
- Outcome
- weight of primary cobs, the weight and number of secondary cobs and more significantly, in the number of tertiary cobse0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“As N rates were increased, there was an increase in the weight of primary cobs, the weight and number of secondary cobs and more significantly, in the number of tertiary cobs”
t0“Sweet corn”
Claim · model-written summary
Nitrogen source did not affect yield or most yield components.
- Taxon
- Sweet cornt0
- Treatment
- source of Ne0
- Outcome
- yield or most yield related componentse0
- Direction
- did not have any effecte0
Not reportedComparator
Verbatim
e0“The source of N did not have any effect on the yield or most yield related components”
t0“Sweet corn”
Claim · model-written summary
Ammonium sulfate gave higher tertiary cob yield and number.
- Taxon
- Sweet cornt0
- Treatment
- ammonium sulfate treatmentse0
- Outcome
- yield and number of tertiary cobse0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“yield and number of tertiary cobs, which were higher in the ammonium sulfate treatments”
t0“Sweet corn”
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