Abstract
Barnyard grass interference with rice is one of the major causes of low yield. In a field experiment influence of different nitrogen levels – 0, 60, 120 and 180 kg ha−1 – on barnyard grass density – 0, 4, 8, 12, and 16 plants m−2 – was evaluated to quantify the effect of barnyard grass on rice performance at different nitrogen levels. Rice-barnyard grass competition and N application significantly effected growth, yield and quality of rice. Increase in barnyard grass density resulted in corresponding decrease in the growth, yield and quality of rice; nevertheless, increase in N application improved the growth, yield and quality. Maximum spikelets, kernel weight, yield, harvest index, normal kernels, amylose contents, kernel water absorption ratio, and minimum sterile spikelets, abortive and opaque kernels were obtained with 120 kg N ha−1 and zero barnyard grass density m−2, while maximum tillers number, productive tillers, straw yield, leaf area index, crop growth rate, net assimilation rate and kernel protein contents were recorded from 180 kg N ha−1 with 0 or 4 barnyard grass plants m−2. In nutshell, 120 kg N ha−1 was adequate and four barnyard grass plants had non-significant effect on rice grain yield, and excessive N application reduced kernel quality.
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Claims 12
Claim · model-written summary
Increasing barnyard grass density decreased growth, yield and quality of rice
- Taxon
- rice
Oryza sativae0 - Treatment
- barnyard grass densitye1
- Interactor
- barnyard grass
Echinochloa crus-gallie1weed - Outcome
- growth, yield and qualitye1
- Direction
- decreasee1
- Setting
- field experimente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“Increase in barnyard grass density resulted in corresponding decrease in the growth, yield and quality of rice”
e2“In a field experiment”
Claim · model-written summary
Increasing N application improved growth, yield and quality of rice
- Taxon
- riceOryza sativae0
- Treatment
- N applicatione1
- Outcome
- growth, yield and qualitye1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“increase in N application improved the growth, yield and quality”
Claim · model-written summary
Spikelets, kernel weight and yield were maximal with 120 kg N ha-1 and no barnyard grass
- Taxon
- riceOryza sativae0
- Treatment
- 120 kg N ha−1e1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- spikelets, kernel weight, yielde1
- Direction
- Maximume1
- Qualifier
- zero barnyard grass density m−2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“Maximum spikelets, kernel weight, yield, harvest index, normal kernels, amylose contents, kernel water absorption ratio, and minimum sterile spikelets, abortive and opaque kernels were obtained with 120 kg N ha−1 and zero barnyard grass density m−2”
Claim · model-written summary
Harvest index, normal kernels and amylose contents were maximal with 120 kg N ha-1 and no barnyard grass
- Taxon
- riceOryza sativae0
- Treatment
- 120 kg N ha−1e1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- harvest index, normal kernels, amylose contentse1
- Direction
- Maximume1
- Qualifier
- zero barnyard grass density m−2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“Maximum spikelets, kernel weight, yield, harvest index, normal kernels, amylose contents, kernel water absorption ratio, and minimum sterile spikelets, abortive and opaque kernels were obtained with 120 kg N ha−1 and zero barnyard grass density m−2”
Claim · model-written summary
Kernel water absorption ratio was maximal with 120 kg N ha-1 and no barnyard grass
- Taxon
- riceOryza sativae0
- Treatment
- 120 kg N ha−1e1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- kernel water absorption ratioe1
- Direction
- Maximume1
- Qualifier
- zero barnyard grass density m−2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“Maximum spikelets, kernel weight, yield, harvest index, normal kernels, amylose contents, kernel water absorption ratio, and minimum sterile spikelets, abortive and opaque kernels were obtained with 120 kg N ha−1 and zero barnyard grass density m−2”
Claim · model-written summary
Sterile spikelets, abortive and opaque kernels were minimal with 120 kg N ha-1 and no barnyard grass
- Taxon
- riceOryza sativae0
- Treatment
- 120 kg N ha−1e1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- sterile spikelets, abortive and opaque kernelse1
- Direction
- minimume1
- Qualifier
- zero barnyard grass density m−2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“Maximum spikelets, kernel weight, yield, harvest index, normal kernels, amylose contents, kernel water absorption ratio, and minimum sterile spikelets, abortive and opaque kernels were obtained with 120 kg N ha−1 and zero barnyard grass density m−2”
Claim · model-written summary
Tillers number, productive tillers and straw yield were maximal with 180 kg N ha-1 and 0 or 4 barnyard grass plants
- Taxon
- riceOryza sativae0
- Treatment
- 180 kg N ha−1e1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- tillers number, productive tillers, straw yielde1
- Direction
- maximume1
- Qualifier
- with 0 or 4 barnyard grass plants m−2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“maximum tillers number, productive tillers, straw yield, leaf area index, crop growth rate, net assimilation rate and kernel protein contents were recorded from 180 kg N ha−1 with 0 or 4 barnyard grass plants m−2”
Claim · model-written summary
Leaf area index, crop growth rate and net assimilation rate were maximal with 180 kg N ha-1 and 0 or 4 barnyard grass plants
- Taxon
- riceOryza sativae0
- Treatment
- 180 kg N ha−1e1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- leaf area index, crop growth rate, net assimilation ratee1
- Direction
- maximume1
- Qualifier
- with 0 or 4 barnyard grass plants m−2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“maximum tillers number, productive tillers, straw yield, leaf area index, crop growth rate, net assimilation rate and kernel protein contents were recorded from 180 kg N ha−1 with 0 or 4 barnyard grass plants m−2”
Claim · model-written summary
Kernel protein contents were maximal with 180 kg N ha-1 and 0 or 4 barnyard grass plants
- Taxon
- riceOryza sativae0
- Treatment
- 180 kg N ha−1e1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- kernel protein contentse1
- Direction
- maximume1
- Qualifier
- with 0 or 4 barnyard grass plants m−2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“maximum tillers number, productive tillers, straw yield, leaf area index, crop growth rate, net assimilation rate and kernel protein contents were recorded from 180 kg N ha−1 with 0 or 4 barnyard grass plants m−2”
Claim · model-written summary
120 kg N ha-1 is an adequate N rate for rice in this system
- Taxon
- riceOryza sativae0
- Treatment
- 120 kg N ha−1e1
- Outcome
- 120 kg N ha−1 was adequatee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“In nutshell, 120 kg N ha−1 was adequate and four barnyard grass plants had non-significant effect on rice grain yield, and excessive N application reduced kernel quality”
Claim · model-written summary
Four barnyard grass plants per m2 had a non-significant effect on rice grain yield
- Taxon
- riceOryza sativae1
- Interactor
- barnyard grassEchinochloa crus-gallie1weed
- Outcome
- rice grain yielde1
- Direction
- non-significant effecte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In nutshell, 120 kg N ha−1 was adequate and four barnyard grass plants had non-significant effect on rice grain yield, and excessive N application reduced kernel quality”
Claim · model-written summary
Excessive N application reduced rice kernel quality
- Taxon
- riceOryza sativae0
- Treatment
- excessive N applicatione1
- Outcome
- kernel qualitye1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interference with rice”
e1“In nutshell, 120 kg N ha−1 was adequate and four barnyard grass plants had non-significant effect on rice grain yield, and excessive N application reduced kernel quality”
The same questions in other papers
nitrogen · Echinochloa crus-galli · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
1 paper more in this group
See all 5 papers →nitrogen · quality: general · Oryza sativa (rice)Positive and negative results
45 papers in the same direction as this paper · 15 in the opposite direction
- negative
- negative
- no effect
57 papers more in this group
See all 61 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.