Abstract
Nitrogen (N) is one of the most important nutrients in increasing lowland rice yield. Two greenhouse experiments were conducted to evaluate influence of ammonium sulfate and urea fertilization on growth, yield and yield components of lowland rice. The nitrogen rates used were 0, 50, 100, 150, 300 and 400 mg N kg−1 of soil. Shoot dry weight and grain yield were significantly (P < 0.01) increased in a quadratic fashion when N rate increased from 0 to 400 mg kg−1 by ammonium sulfate as well as urea fertilization. Maximum grain yield was obtained at 168 mg N kg−1 soil by ammonium sulfate and at 152 mg N kg−1 soil by urea. Maximum grain yield at average N rate (160 mg kg−1) was 22% higher with the application of ammonium sulfate compared to urea, indicating superiority of ammonium sulfate compared to urea. Rice yield components, N uptake and use efficiency were significantly influenced with the increasing N rate from 0 to 400 mg kg−1 of soil by both the sources of N. Plant height, shoot dry weight, grain harvest index, 1000 grain weight and N uptake and use efficiency in shoot and grain had significant positive association with grain yield. However, spikelet sterility was negatively associated with grain yield. Soil pH, soil calcium, phosphorus, and potassium contents were significantly influenced by N treatments with urea fertilization. These soil properties were not influenced significantly by ammonium sulfate treatment, except P content.
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Claims 12
Claim · model-written summary
Shoot dry weight and grain yield of lowland rice increased in a quadratic fashion as N rate rose from 0 to 400 mg kg−1 with ammonium sulfate or urea.
- Taxon
- lowland ricet0
- Treatment
- ammonium sulfate as well as urea fertilizatione2
- Outcome
- Shoot dry weight and grain yielde2
- Direction
- increasede2
- Qualifier
- in a quadratic fashione2
- Setting
- greenhouse experimentse1
Not reportedComparator
Verbatim
t0“LOWLAND RICE”
e1“Two greenhouse experiments were conducted to evaluate influence of ammonium sulfate and urea fertilization on growth, yield and yield components of lowland rice”
e2“Shoot dry weight and grain yield were significantly (P < 0.01) increased in a quadratic fashion when N rate increased from 0 to 400 mg kg−1 by ammonium sulfate as well as urea fertilization”
Claim · model-written summary
Maximum grain yield of lowland rice was obtained at 168 mg N kg−1 soil with ammonium sulfate.
- Taxon
- lowland ricet0
- Treatment
- ammonium sulfatee3
- Outcome
- Maximum grain yielde3
- Direction
- Maximume3
- Value
- 168 mg N kg−1 soile3
Not reportedComparator
Verbatim
t0“LOWLAND RICE”
e3“Maximum grain yield was obtained at 168 mg N kg−1 soil by ammonium sulfate and at 152 mg N kg−1 soil by urea”
Claim · model-written summary
Maximum grain yield of lowland rice was obtained at 152 mg N kg−1 soil with urea.
- Taxon
- lowland ricet0
- Treatment
- ureae3
- Outcome
- Maximum grain yielde3
- Direction
- Maximume3
- Value
- 152 mg N kg−1 soile3
Not reportedComparator
Verbatim
t0“LOWLAND RICE”
e3“Maximum grain yield was obtained at 168 mg N kg−1 soil by ammonium sulfate and at 152 mg N kg−1 soil by urea”
Claim · model-written summary
At an average N rate of 160 mg kg−1, maximum grain yield of lowland rice was 22% higher with ammonium sulfate than with urea.
Verbatim
t0“LOWLAND RICE”
e4“Maximum grain yield at average N rate (160 mg kg−1) was 22% higher with the application of ammonium sulfate compared to urea”
Claim · model-written summary
Yield components of lowland rice were significantly influenced by increasing N rate from 0 to 400 mg kg−1 of soil with either N source.
- Taxon
- lowland ricet0
- Treatment
- increasing N rate from 0 to 400 mg kg−1 of soile5
- Outcome
- Rice yield componentse5
Not reportedComparatorDirection
Verbatim
t0“LOWLAND RICE”
e5“Rice yield components, N uptake and use efficiency were significantly influenced with the increasing N rate from 0 to 400 mg kg−1 of soil by both the sources of N”
Claim · model-written summary
N uptake and use efficiency of lowland rice were significantly influenced by increasing N rate from 0 to 400 mg kg−1 of soil with either N source.
- Taxon
- lowland ricet0
- Treatment
- increasing N rate from 0 to 400 mg kg−1 of soile5
- Outcome
- N uptake and use efficiencye5
Not reportedComparatorDirection
Verbatim
t0“LOWLAND RICE”
e5“Rice yield components, N uptake and use efficiency were significantly influenced with the increasing N rate from 0 to 400 mg kg−1 of soil by both the sources of N”
Claim · model-written summary
Plant height, shoot dry weight and grain harvest index had a significant positive association with grain yield in lowland rice.
Verbatim
t0“LOWLAND RICE”
e6“Plant height, shoot dry weight, grain harvest index, 1000 grain weight and N uptake and use efficiency in shoot and grain had significant positive association with grain yield”
Claim · model-written summary
1000 grain weight and N uptake and use efficiency in shoot and grain had a significant positive association with grain yield in lowland rice.
Verbatim
t0“LOWLAND RICE”
e6“Plant height, shoot dry weight, grain harvest index, 1000 grain weight and N uptake and use efficiency in shoot and grain had significant positive association with grain yield”
Claim · model-written summary
Spikelet sterility was negatively associated with grain yield in lowland rice.
Verbatim
t0“LOWLAND RICE”
e7“However, spikelet sterility was negatively associated with grain yield”
Claim · model-written summary
Soil pH, calcium, phosphorus and potassium contents were significantly influenced by N treatments with urea fertilization in lowland rice trials.
- Taxon
- lowland ricet0
- Treatment
- urea fertilizatione1
- Outcome
- Soil pH, soil calcium, phosphorus, and potassium contentse1
Not reportedComparatorDirection
Verbatim
t0“LOWLAND RICE”
e1“Soil pH, soil calcium, phosphorus, and potassium contents were significantly influenced by N treatments with urea fertilization”
Claim · model-written summary
Soil properties other than P content were not significantly influenced by ammonium sulfate treatment.
- Taxon
- lowland ricet0
- Treatment
- ammonium sulfate treatmente2
- Outcome
- soil propertiese2
- Direction
- not influenced significantlye2
Not reportedComparator
Verbatim
t0“LOWLAND RICE”
e2“These soil properties were not influenced significantly by ammonium sulfate treatment, except P content”
Claim · model-written summary
Soil P content was the exception among soil properties in the ammonium sulfate treatment.
Not reportedComparatorDirection
Verbatim
t0“LOWLAND RICE”
e2“These soil properties were not influenced significantly by ammonium sulfate treatment, except P content”
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