Abstract
A lack of synchronization between nitrogen (N) demand and supply results in the loss of applied nitrogen from the soil-plant system. Leaf colour chart (LCC) based nano urea application according to crop specific need has the potential to enhance the crop productivity by reducing N losses. In this context, a field experiment was conducted during summer seasons of 2022 and 2023 on medium black calcareous soil at Junagadh (Gujarat) to study the response of sweet corn to nano urea under precision nitrogen management. Ten treatments comprising 40 kg N as basal (through DAP and urea) + 40 kg N through urea at 25-30 DAS + 40 kg N through urea at 40-45 DAS, 40 kg N as basal + 40 kg N through urea at 25-30 DAS + two foliar spray of nano urea 0.4% (4 ml/l water) when LCC ≤ 4, 40 kg N as basal + 30 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4, 40 kg N as basal + 20 kg N through urea at 25-30 DAS + four foliar spray of nano urea 0.4% when LCC ≤ 4, 40 kg N as basal + 20 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4, 40 kg N as basal + 10 kg N through urea at 25-30 DAS + four foliar spray of nano urea 0.4% when LCC ≤ 4, 40 kg N as basal + 10 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4, 40 kg N as basal + four foliar spray of nano urea 0.4% when LCC ≤ 4, 40 kg N as basal + three foliar spray of nano urea 0.4% when LCC ≤ 4 and control (without N application) in Randomized Block Design with three replications. Based on the results of two-years field study, it can be concluded that higher growth, green cob and fodder yields, quality, net returns and B: C ratio of sweet corn can be obtained by the application of 40 kg N as basal + 40 kg N through urea at 25-30 DAS + two foliar spray of nano urea 0.4% when LCC ≤ 4 or 40 kg N as basal + 30 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4 or 40 kg N as basal + 40 kg N through urea at 25-30 DAS + 40 kg N through urea at 40-45 DAS.
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Claims 6
Claim · model-written summary
The authors conclude that basal 40 kg N, 40 kg N through urea at 25–30 DAS and two LCC-triggered nano-urea sprays can provide higher growth and green cob and fodder yields.
- Taxon
- sweet corne0
- Treatment
- 40 kg N as basal + 40 kg N through urea at 25-30 DAS + two foliar spray of nano urea 0.4% when LCC ≤ 4e0
- Outcome
- growth, green cob and fodder yieldse0
- Direction
- highere0
- Setting
- Junagadh (Gujarat)e1
Not reportedComparator
Verbatim
e0“higher growth, green cob and fodder yields, quality, net returns and B: C ratio of sweet corn can be obtained by the application of 40 kg N as basal + 40 kg N through urea at 25-30 DAS + two foliar spray of nano urea 0.4% when LCC ≤ 4”
e1“at Junagadh (Gujarat)”
Claim · model-written summary
The same two-spray nitrogen schedule can provide higher quality, net returns and benefit-cost ratio.
- Taxon
- sweet corne0
- Treatment
- 40 kg N as basal + 40 kg N through urea at 25-30 DAS + two foliar spray of nano urea 0.4% when LCC ≤ 4e0
- Outcome
- quality, net returns and B: C ratioe0
- Direction
- highere0
- Setting
- Junagadh (Gujarat)e1
Not reportedComparator
Verbatim
e0“higher growth, green cob and fodder yields, quality, net returns and B: C ratio of sweet corn can be obtained by the application of 40 kg N as basal + 40 kg N through urea at 25-30 DAS + two foliar spray of nano urea 0.4% when LCC ≤ 4”
e1“at Junagadh (Gujarat)”
Claim · model-written summary
Basal 40 kg N, 30 kg N through urea at 25–30 DAS and three LCC-triggered nano-urea sprays can provide higher growth and green cob and fodder yields.
- Taxon
- sweet corne0
- Treatment
- 40 kg N as basal + 30 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4e1
- Outcome
- growth, green cob and fodder yieldse0
- Direction
- highere0
- Setting
- Junagadh (Gujarat)e2
Not reportedComparator
Verbatim
e0“higher growth, green cob and fodder yields, quality, net returns and B: C ratio of sweet corn”
e1“40 kg N as basal + 30 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4 or 40 kg N as basal”
e2“at Junagadh (Gujarat)”
Claim · model-written summary
The three-spray nitrogen schedule can provide higher quality, net returns and benefit-cost ratio.
- Taxon
- sweet corne0
- Treatment
- 40 kg N as basal + 30 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4e1
- Outcome
- quality, net returns and B: C ratioe0
- Direction
- highere0
- Setting
- Junagadh (Gujarat)e2
Not reportedComparator
Verbatim
e0“higher growth, green cob and fodder yields, quality, net returns and B: C ratio of sweet corn”
e1“40 kg N as basal + 30 kg N through urea at 25-30 DAS + three foliar spray of nano urea 0.4% when LCC ≤ 4 or 40 kg N as basal”
e2“at Junagadh (Gujarat)”
Claim · model-written summary
Basal 40 kg N followed by 40 kg N through urea at each of 25–30 and 40–45 DAS can provide higher growth and green cob and fodder yields.
- Taxon
- sweet corne0
- Treatment
- 40 kg N as basal + 40 kg N through urea at 25-30 DAS + 40 kg N through urea at 40-45 DASe1
- Outcome
- growth, green cob and fodder yieldse0
- Direction
- highere0
- Setting
- Junagadh (Gujarat)e2
Not reportedComparator
Verbatim
e0“higher growth, green cob and fodder yields, quality, net returns and B: C ratio of sweet corn”
e1“or 40 kg N as basal + 40 kg N through urea at 25-30 DAS + 40 kg N through urea at 40-45 DAS.”
e2“at Junagadh (Gujarat)”
Claim · model-written summary
The three conventional urea applications can provide higher quality, net returns and benefit-cost ratio.
- Taxon
- sweet corne0
- Treatment
- 40 kg N as basal + 40 kg N through urea at 25-30 DAS + 40 kg N through urea at 40-45 DASe1
- Outcome
- quality, net returns and B: C ratioe0
- Direction
- highere0
- Setting
- Junagadh (Gujarat)e2
Not reportedComparator
Verbatim
e0“higher growth, green cob and fodder yields, quality, net returns and B: C ratio of sweet corn”
e1“or 40 kg N as basal + 40 kg N through urea at 25-30 DAS + 40 kg N through urea at 40-45 DAS.”
e2“at Junagadh (Gujarat)”
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