Abstract
Iran with nearly 165 million hectare of land area and amount of rainfall equal to 300 mm in 67% of its territorial land, is considered as a semi-dry region in the world. Rice production in Iran needs to be increased to feed a growing population, whereas water for irrigation is getting scarce. One way to decrease water consumption in paddy field is the change of irrigation regime and replacement of continuous submergence to alternate submergence. In order to investigate the effect of different regimes of irrigation and nitrogen fertilizer on yield of hybrid rice, an experiment was conducted at the Rice Research Institute of Iran during crop season 2008. The experiment was arranged in split plot based on completely randomized block design with 3 replications in which water regimes were main factor included continuous submergence and alternately submergence (irrigation intervals of 5, 8 and 11days) and nitrogen fertilizer levels were sub factor included 0, 90, 120 and 150 kg/ha. Grain yield,water use efficiency,relative water content,total nitrogen,grain nitrogen and nitrogen harvest index were statistically the same under continuous submergence and irrigation interval of 5 and 8 days and were lowest in 11- day interval.total nitrogen,grain nitrogen and nitrogen harvest index decreased with the increment of nitrogen.we concluded that 8- day interval could reduce water consumption in paddy fields in the North of Iran.
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Claims 6
Claim · model-written summary
Grain yield, water use efficiency and relative water content of hybrid rice were statistically the same under continuous submergence and 5- and 8-day irrigation intervals.
- Taxon
- hybrid rice
Oryza sativae5 - Treatment
- irrigation interval of 5 and 8 dayse2
- Outcome
- Grain yield,water use efficiency,relative water contente2
- Direction
- statistically the samee2
- Comparator
- continuous submergencee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Grain yield,water use efficiency,relative water content,total nitrogen,grain nitrogen and nitrogen harvest index were statistically the same under continuous submergence and irrigation interval of 5 and 8 days and were lowest in 11- day interval”
e5“effect of different regimes of irrigation and nitrogen fertilizer on yield of hybrid rice”
Claim · model-written summary
Grain yield, water use efficiency and relative water content of hybrid rice were lowest at the 11-day irrigation interval.
- Taxon
- hybrid riceOryza sativae5
- Treatment
- 11- day intervale2
- Outcome
- Grain yield,water use efficiency,relative water contente2
- Direction
- loweste2
- Comparator
- irrigation interval of 5 and 8 dayse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Grain yield,water use efficiency,relative water content,total nitrogen,grain nitrogen and nitrogen harvest index were statistically the same under continuous submergence and irrigation interval of 5 and 8 days and were lowest in 11- day interval”
e5“effect of different regimes of irrigation and nitrogen fertilizer on yield of hybrid rice”
Claim · model-written summary
Total nitrogen, grain nitrogen and nitrogen harvest index of hybrid rice were statistically the same under continuous submergence and 5- and 8-day irrigation intervals.
- Taxon
- hybrid riceOryza sativae5
- Treatment
- irrigation interval of 5 and 8 dayse2
- Outcome
- total nitrogen,grain nitrogen and nitrogen harvest indexe2
- Direction
- statistically the samee2
- Comparator
- continuous submergencee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Grain yield,water use efficiency,relative water content,total nitrogen,grain nitrogen and nitrogen harvest index were statistically the same under continuous submergence and irrigation interval of 5 and 8 days and were lowest in 11- day interval”
e5“effect of different regimes of irrigation and nitrogen fertilizer on yield of hybrid rice”
Claim · model-written summary
Total nitrogen, grain nitrogen and nitrogen harvest index of hybrid rice were lowest at the 11-day irrigation interval.
- Taxon
- hybrid riceOryza sativae5
- Treatment
- 11- day intervale2
- Outcome
- total nitrogen,grain nitrogen and nitrogen harvest indexe2
- Direction
- loweste2
- Comparator
- irrigation interval of 5 and 8 dayse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Grain yield,water use efficiency,relative water content,total nitrogen,grain nitrogen and nitrogen harvest index were statistically the same under continuous submergence and irrigation interval of 5 and 8 days and were lowest in 11- day interval”
e5“effect of different regimes of irrigation and nitrogen fertilizer on yield of hybrid rice”
Claim · model-written summary
Total nitrogen, grain nitrogen and nitrogen harvest index of hybrid rice decreased with increasing nitrogen fertilizer.
- Taxon
- hybrid riceOryza sativae5
- Treatment
- increment of nitrogene3
- Outcome
- total nitrogen,grain nitrogen and nitrogen harvest indexe3
- Direction
- decreasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“total nitrogen,grain nitrogen and nitrogen harvest index decreased with the increment of nitrogen”
e5“effect of different regimes of irrigation and nitrogen fertilizer on yield of hybrid rice”
Claim · model-written summary
An 8-day irrigation interval could reduce water consumption of hybrid rice in paddy fields in northern Iran.
- Taxon
- hybrid riceOryza sativae5
- Treatment
- 8- day intervale4
- Outcome
- reduce water consumptione4
- Setting
- the North of Irane4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“we concluded that 8- day interval could reduce water consumption in paddy fields in the North of Iran”
e5“effect of different regimes of irrigation and nitrogen fertilizer on yield of hybrid rice”
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