Abstract
This research was conducted to investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom) and to investigate N and K content of upper leaves analyzed at ten different times. A pot experiment was carried out on a completely randomized design with seven replications under greenhouse conditions at the Experiment Station of Sari Agricultural Sciences and Natural Resources University, Iran, during the growing season in 2008. Nitrogen was applied in the form of urea (46% N) at the rates of 0, 23 and 46 kg N ha-1 and potassium in the form of potassium chloride (60% K2O) at the rates of 0, 30 and 60 kg K2O ha-1. Results indicated that panicle length, plant height, number of tiller, number of grain per panicle, hollow grain percentage, grain and biological yield were significantly affected by N and K fertilization. Maximum grain yield (75.46 g pot-1) occurred at 23 kg N ha-1 and 30 kg K2O ha-1. At flowering stage, K content of stems were higher than leaves, and N content in flag leaves was higher than other plant parts. Key words: Leaf potassium concentration, potassium chloride, rice, top-dressing fertilization, urea and yield.
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Claims 6
Claim · model-written summary
Panicle length, plant height and tiller number of rice were significantly affected by N and K fertilization.
- Taxon
- rice
Oryza sativae0 - Material
- Tarrome0
- Treatment
- nitrogen (N) and potassium (K) top dressinge0
- Outcome
- panicle length, plant height, number of tillere1
- Setting
- greenhouse conditions at the Experiment Station of Sari Agricultural Sciences and Natural Resources University, Irane2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom)”
e1“panicle length, plant height, number of tiller, number of grain per panicle, hollow grain percentage, grain and biological yield were significantly affected by N and K fertilization”
e2“A pot experiment was carried out on a completely randomized design with seven replications under greenhouse conditions at the Experiment Station of Sari Agricultural Sciences and Natural Resources University, Iran”
Claim · model-written summary
Number of grain per panicle and hollow grain percentage of rice were significantly affected by N and K fertilization.
- Taxon
- riceOryza sativae0
- Material
- Tarrome0
- Treatment
- nitrogen (N) and potassium (K) top dressinge0
- Outcome
- number of grain per panicle, hollow grain percentagee1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom)”
e1“panicle length, plant height, number of tiller, number of grain per panicle, hollow grain percentage, grain and biological yield were significantly affected by N and K fertilization”
Claim · model-written summary
Grain and biological yield of rice were significantly affected by N and K fertilization.
- Taxon
- riceOryza sativae0
- Material
- Tarrome0
- Treatment
- nitrogen (N) and potassium (K) top dressinge0
- Outcome
- grain and biological yielde1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom)”
e1“panicle length, plant height, number of tiller, number of grain per panicle, hollow grain percentage, grain and biological yield were significantly affected by N and K fertilization”
Claim · model-written summary
Maximum grain yield of rice (75.46 g pot-1) occurred at 23 kg N ha-1 and 30 kg K2O ha-1.
- Taxon
- riceOryza sativae0
- Treatment
- 23 kg N ha-1 and 30 kg K2O ha-1e3
- Outcome
- grain yielde3
- Direction
- Maximume3
- Value
- 75.46 g pot-1e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom)”
e3“Maximum grain yield (75.46 g pot-1) occurred at 23 kg N ha-1 and 30 kg K2O ha-1”
Claim · model-written summary
At flowering stage, potassium content of rice stems was higher than of leaves.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom)”
e4“At flowering stage, K content of stems were higher than leaves”
Claim · model-written summary
N content in rice flag leaves was higher than in other plant parts.
- Taxon
- riceOryza sativae0
- Organ / stage
- flag leavese5
- Outcome
- N contente5
- Direction
- highere5
- Comparator
- other plant partse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom)”
e5“N content in flag leaves was higher than other plant parts”
The same questions in other papers
potassium · yield · Oryza sativa (rice)Positive and negative results
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- positive
- positive
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See all 383 papers →nitrogen · yield · Oryza sativa (rice)Positive and negative results
1,802 papers in the same direction as this paper · 193 in the opposite direction · 49 reporting no difference from an alternative
- negative
- positive
- positive
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See all 2,045 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.