Abstract
A field experiment was conducted during rainy season of 2007 and 2008 at Wadura, Sopore, to study the effect of crop geometry (60 cm 15 cm, 60 cm 20 cm, 60 cm 25 cm, 60 cm 30 cm) and nitrogen levels (0, 30, 60, 90, 120 and 150 kg N/ha) on yield, yield attributes, nitrogen use efficiency, crop productivity, economics and nitro- gen balance of sweet corn ( Zea mays saccharata Sturt). Plant height, weight of green cobs, number of kernel/cob, 1,000-kernel weight and kernel recovery increased as the inter-plant spacing was increased from 15 to 30 cm, while the number of cobs/ha, plant dry weight and bareness increased with a decrease inter-plant spacing from 30 cm to 15 cm. The maximum cob yield was recorded at 60 cm 20 cm spacing which was higher than 60 cm 25 cm planting geometry. A decrease in planting spacing from 60 cm 20 cm to 60 cm 15 cm caused 33.2% reduc- tion in cob yield. The kernel yield and crop productivity, crop profitability, net returns, nitrogen uptake and nitrogen use efficiency were also higher at 60 cm 20 cm planting spacing. Increasing nitrogen levels upto 120 kg/ha showed marked improvement in plant height, plant dry weight, number of cobs/ha, number of kernels/cob, 1000- kernel weight, green cob weight and kernel recovery, which consequently improved the yield and return. While Barrenness in cobs also declined with increasing nitrogen levels. Highest nitrogen uptake, total availability and ac- tual residual soil nitrogen contents were observed at 150 kg N/ha. Increasing nitrogen levels progressively re- duced agronomic and physiological nitrogen use efficiency. A level of 125.7 kg N/ha was found to be economic optimum with green cob yield of 14.21 t/ha and a response of 7.55 t/ha. The response to optimum level of N was found to be 60.09 kg green cob/kg N applied. Hence, crop geometry of 60 cm 20 cm with nitrogen level of 120 kg/ha should be adopted to obtain the maximum green cob yield and net profit from sweet corn in Kashmir valley.
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Claims 12
Claim · model-written summary
Wider interplant spacing increased height, green cob weight, kernels per cob, kernel weight, and kernel recovery.
Verbatim
e0“Plant height, weight of green cobs, number of kernel/cob, 1,000-kernel weight and kernel recovery increased as the inter-plant spacing was increased from 15 to 30 cm”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Closer spacing increased cobs per hectare, dry weight, and bareness.
Verbatim
e0“the number of cobs/ha, plant dry weight and bareness increased with a decrease inter-plant spacing from 30 cm to 15 cm”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Cob yield was greatest at 60 cm 20 cm spacing and exceeded yield at 60 cm 25 cm.
Verbatim
e0“The maximum cob yield was recorded at 60 cm 20 cm spacing which was higher than 60 cm 25 cm planting geometry.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Reducing spacing from 60 cm 20 cm to 60 cm 15 cm reduced cob yield by 33.2%.
Verbatim
e0“A decrease in planting spacing from 60 cm 20 cm to 60 cm 15 cm caused 33.2% reduc- tion in cob yield.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
At 60 cm 20 cm spacing, kernel yield, productivity, profitability, returns, nitrogen uptake, and nitrogen use efficiency were higher.
- Taxon
- sweet corne1
- Treatment
- 60 cm 20 cm planting spacinge0
- Outcome
- kernel yield and crop productivity, crop profitability, net returns, nitrogen uptake and nitrogen use efficiencye0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“The kernel yield and crop productivity, crop profitability, net returns, nitrogen uptake and nitrogen use efficiency were also higher at 60 cm 20 cm planting spacing.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Nitrogen rates up to 120 kg/ha improved height, dry weight, cobs per hectare, kernels per cob, kernel weight, cob weight, kernel recovery, yield, and return.
- Taxon
- sweet corne1
- Treatment
- nitrogen levels upto 120 kg/hae0
- Outcome
- plant height, plant dry weight, number of cobs/ha, number of kernels/cob, 1000- kernel weight, green cob weight and kernel recoverye0
- Direction
- improvemente0
Not reportedComparator
Verbatim
e0“Increasing nitrogen levels upto 120 kg/ha showed marked improvement in plant height, plant dry weight, number of cobs/ha, number of kernels/cob, 1000- kernel weight, green cob weight and kernel recovery, which consequently improved the yield and return.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Increasing nitrogen reduced cob bareness.
- Taxon
- sweet corne1
- Treatment
- increasing nitrogen levelse0
- Outcome
- Barrenness in cobse0
- Direction
- declinede0
Not reportedComparator
Verbatim
e0“Barrenness in cobs also declined with increasing nitrogen levels.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Nitrogen uptake and available and residual soil nitrogen peaked at 150 kg N/ha.
- Taxon
- sweet corne1
- Treatment
- 150 kg N/hae0
- Outcome
- nitrogen uptake, total availability and ac- tual residual soil nitrogen contentse0
- Direction
- Higheste0
Not reportedComparator
Verbatim
e0“Highest nitrogen uptake, total availability and ac- tual residual soil nitrogen contents were observed at 150 kg N/ha.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Increasing nitrogen reduced agronomic and physiological nitrogen use efficiency.
- Taxon
- sweet corne1
- Treatment
- Increasing nitrogen levelse0
- Outcome
- agronomic and physiological nitrogen use efficiencye0
- Direction
- re- ducede0
Not reportedComparator
Verbatim
e0“Increasing nitrogen levels progressively re- duced agronomic and physiological nitrogen use efficiency.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
The economic optimum was 125.7 kg N/ha with 14.21 t/ha green cob yield and 7.55 t/ha response.
Verbatim
e0“A level of 125.7 kg N/ha was found to be economic optimum with green cob yield of 14.21 t/ha and a response of 7.55 t/ha.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
Response to the optimum nitrogen level was 60.09 kg green cob per kg N applied.
Verbatim
e0“The response to optimum level of N was found to be 60.09 kg green cob/kg N applied.”
e1“sweet corn ( Zea mays saccharata Sturt)”
Claim · model-written summary
The authors recommend 60 cm 20 cm spacing with 120 kg/ha nitrogen for maximum cob yield and net profit in Kashmir valley.
Verbatim
e0“crop geometry of 60 cm 20 cm with nitrogen level of 120 kg/ha should be adopted to obtain the maximum green cob yield and net profit from sweet corn in Kashmir valley.”
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