Abstract
Two field experiments were conducted at Rice Research and Training Center (RRTC), Sakha, Kafr El-Sheikh, Egypt, in 2008 and 2009 growing seasons. The objective of this research was aimed to find out the optimum seedling age and nitrogen levels to obtain maximum production of hybrid rice varieties under normal soil. Growth analysis, grain yield and its components, N-uptake and nitrogen use efficiency were determined. The most important obtained results could be summarized as follows: In both seasons, SK2034H hybrid rice variety significantly exceeded SK2058H variety. and recorded the highest dry matter production, plant height, number of panicles/m2, number of spikelets/panicle, number of filled grains (%), panicle weight, grain yield, N content, N-uptake for grains and straw and N-use efficiency (NUE). 25 day old seedlings had higher values of dry matter (DM), leaf area index (LAI), plant height, grain yield, harvest index (HI), and most of its attributes, nitrogen content, N-uptake, and use efficiency (NUE) than old seedlings 35 or 40 day old. The minimum values of these traits were obtained when plants were transplanted with 40 day old seedlings. Increasing nitrogen fertilizer levels significantly improved growth, yield and its components. Each unit increase in N-levels led to a significant increase in all these traits. Nitrogen use efficiency (NUE) was significantly higher at lower N levels and decreased significantly with increasing N fertilizer levels. On the other hand, N-content and N-uptake for grain and straw yields significantly increased by increasing the nitrogen fertilizer level up to 220 kg N/ha. The interaction between hybrid rice varieties and seedling age significantly affected dry matter, panicle weight, 1000-grain weight, grain yield and N-uptake for grains. A significant interaction effect between hybrid rice varieties and N fertilizer levels for dry matter, grain yield and N-uptake for grains. The interaction between seedling age and nitrogen levels significantly affect dry matter, number of spikelets/panicle and grain yield. It could be concluded that hybrid rice varieties must be transplanted with seedling, 25 days old, fertilized at a rate of 220 kg N/ha in three equal splits to get maximum grain yield per unit area.
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Claims 14
Claim · model-written summary
SK2034H exceeded SK2058H in dry matter and plant height.
- Taxon
- rice
Oryza sativae0 - Material
- SK2034He0
- Outcome
- dry matter production, plant heighte0
- Direction
- higheste0
- Comparator
- SK2058He0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SK2034H hybrid rice variety significantly exceeded SK2058H variety. and recorded the highest dry matter production, plant height”
Claim · model-written summary
SK2034H led in panicle number, spikelets per panicle, filled grains, panicle weight and grain yield.
- Taxon
- riceOryza sativat0
- Material
- SK2034He2
- Outcome
- number of panicles/m2, number of spikelets/panicle, number of filled grains (%), panicle weight, grain yielde0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recorded the highest dry matter production, plant height, number of panicles/m2, number of spikelets/panicle, number of filled grains (%), panicle weight, grain yield”
t0“RICE”
e1“recorded the highest dry matter production, plant height, number of panicles/m2, number of spikelets/panicle, number of filled grains (%), panicle weight, grain yield”
e2“SK2034H hybrid rice variety significantly exceeded SK2058H variety. and recorded the highest dry matter production, plant height”
Claim · model-written summary
SK2034H led in nitrogen content, grain and straw nitrogen uptake, and nitrogen-use efficiency.
- Taxon
- riceOryza sativat0
- Outcome
- N content, N-uptake for grains and straw and N-use efficiency (NUE)e0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recorded the highest dry matter production, plant height, number of panicles/m2, number of spikelets/panicle, number of filled grains (%), panicle weight, grain yield, N content, N-uptake for grains and straw and N-use efficiency (NUE)”
t0“RICE”
Claim · model-written summary
Transplanting 25-day seedlings gave higher dry matter, leaf area and height than transplanting 35- or 40-day seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- 25 day old seedlingse0
- Outcome
- dry matter (DM), leaf area index (LAI), plant heighte0
- Direction
- highere0
- Comparator
- old seedlings 35 or 40 day olde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“25 day old seedlings had higher values of dry matter (DM), leaf area index (LAI), plant height, grain yield, harvest index (HI), and most of its attributes, nitrogen content, N-uptake, and use efficiency (NUE) than old seedlings 35 or 40 day old”
t0“RICE”
Claim · model-written summary
Transplanting 25-day seedlings gave higher grain yield, harvest index and yield attributes than 35- or 40-day seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- 25 day old seedlingse0
- Outcome
- grain yield, harvest index (HI), and most of its attributese0
- Direction
- highere0
- Comparator
- old seedlings 35 or 40 day olde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“25 day old seedlings had higher values of dry matter (DM), leaf area index (LAI), plant height, grain yield, harvest index (HI), and most of its attributes, nitrogen content, N-uptake, and use efficiency (NUE) than old seedlings 35 or 40 day old”
t0“RICE”
Claim · model-written summary
Transplanting 25-day seedlings gave higher nitrogen content, uptake and use efficiency than 35- or 40-day seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- 25 day old seedlingse0
- Outcome
- nitrogen content, N-uptake, and use efficiency (NUE)e0
- Direction
- highere0
- Comparator
- old seedlings 35 or 40 day olde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“25 day old seedlings had higher values of dry matter (DM), leaf area index (LAI), plant height, grain yield, harvest index (HI), and most of its attributes, nitrogen content, N-uptake, and use efficiency (NUE) than old seedlings 35 or 40 day old”
t0“RICE”
Claim · model-written summary
The measured traits were lowest when plants were transplanted at 40 days.
- Taxon
- riceOryza sativat0
- Treatment
- 40 day old seedlingse0
- Outcome
- minimum values of these traitse0
- Direction
- minimume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The minimum values of these traits were obtained when plants were transplanted with 40 day old seedlings”
t0“RICE”
Claim · model-written summary
Increasing nitrogen rate significantly improved rice growth, yield and yield components.
- Taxon
- riceOryza sativat0
- Treatment
- Increasing nitrogen fertilizer levelse0
- Outcome
- growth, yield and its componentse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing nitrogen fertilizer levels significantly improved growth, yield and its components. Each unit increase in N-levels led to a significant increase in all these traits”
t0“RICE”
Claim · model-written summary
Nitrogen-use efficiency was significantly higher at lower nitrogen levels and fell as nitrogen increased.
- Taxon
- riceOryza sativat0
- Treatment
- increasing N fertilizer levelse0
- Outcome
- Nitrogen use efficiency (NUE)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen use efficiency (NUE) was significantly higher at lower N levels and decreased significantly with increasing N fertilizer levels”
t0“RICE”
Claim · model-written summary
Grain and straw nitrogen content and uptake rose significantly with nitrogen rate through 220 kg N/ha.
- Taxon
- riceOryza sativat0
- Treatment
- increasing the nitrogen fertilizer level up to 220 kg N/hae0
- Outcome
- N-content and N-uptake for grain and straw yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N-content and N-uptake for grain and straw yields significantly increased by increasing the nitrogen fertilizer level up to 220 kg N/ha”
t0“RICE”
Claim · model-written summary
Hybrid and seedling age interacted significantly for dry matter, panicle weight, thousand-grain weight, grain yield and grain nitrogen uptake.
- Taxon
- riceOryza sativae0
- Treatment
- seedling agee0
- Outcome
- dry matter, panicle weight, 1000-grain weight, grain yield and N-uptake for grainse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction between hybrid rice varieties and seedling age significantly affected dry matter, panicle weight, 1000-grain weight, grain yield and N-uptake for grains”
Claim · model-written summary
Hybrid and fertilizer nitrogen level interacted significantly for dry matter, grain yield and grain nitrogen uptake.
- Taxon
- riceOryza sativae0
- Treatment
- N fertilizer levelse0
- Outcome
- dry matter, grain yield and N-uptake for grainse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant interaction effect between hybrid rice varieties and N fertilizer levels for dry matter, grain yield and N-uptake for grains”
Claim · model-written summary
Seedling age and nitrogen level interacted significantly for dry matter, spikelets per panicle and grain yield.
- Taxon
- riceOryza sativat0
- Treatment
- nitrogen levelse0
- Outcome
- dry matter, number of spikelets/panicle and grain yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction between seedling age and nitrogen levels significantly affect dry matter, number of spikelets/panicle and grain yield”
t0“RICE”
Claim · model-written summary
The authors recommend 25-day seedlings and 220 kg N/ha in three splits for maximum grain yield.
- Taxon
- riceOryza sativae0
- Treatment
- 25 days old, fertilized at a rate of 220 kg N/ha in three equal splitse0
- Outcome
- maximum grain yield per unit areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrid rice varieties must be transplanted with seedling, 25 days old, fertilized at a rate of 220 kg N/ha in three equal splits to get maximum grain yield per unit area”
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See all 3,455 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.