Abstract
Abstract Greenhouse and field experiments were conducted to study the effects of water regime on growth of rice. The greenhouse experiment investigated the effects of two water regimes‐continuous flooding and flooding with soil drying between crops for 2 to 3 weeks on the growth of rice during six cropping (for six week each) on seven soils varying widely in total N contents (0.07 to 0.35%). The results averaged for the 7 soils indicated that the drymatter production or N uptake of rice was not affected by the water regimes during the six croppings. The field experiment conducted during the dry season for two consecutive years (1976 and 1977) on a near neutral clay soil studied the effects of three water regimes (continuous flooding alternate flooding and soil drying every 2 weeks, and continuous flooding with 2 weeks mid season soil drying after 6 weeks of transplanting) and three levels of fertilizer N (0, 100 and 200 kg N/ha as urea) on grain yield and N uptake of rice. The results confirmed the absence of any significant reduction in grain yield or N uptake as a result of any of the soil drying treatments during the growing season on the unfertilized plots carrying a rice crop. On the plots fertilized with 100 or 200 kg N/na, alternate flooding and drying resulted in a significant depression in both grain yield and N uptake. Soil analysis supported heavy losses of N in the fertilized plots that underwent alternate flooding and soil drying apparently by nitrification and denitrification reactions. The results of this study suggest that alternate flooding and drying of soils in the presence of established rice plants itiay not cause a significant loss of nitrogen in unfertilized plots although in plots fertilized with high rates of N the losses may be large as indicated by the performance of rice crop.
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Claims 4
Claim · model-written summary
Averaged over seven soils in the greenhouse, dry matter production and N uptake of rice were not affected by water regime over six croppings.
- Taxon
- rice
Oryza sativat0 - Treatment
- water regimese0
- Outcome
- drymatter production or N uptakee0
- Direction
- not affectede0
- Comparator
- continuous floodinge1
- Setting
- 7 soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“The results averaged for the 7 soils indicated that the drymatter production or N uptake of rice was not affected by the water regimes during the six croppings”
e1“continuous flooding and flooding with soil drying between crops”
Claim · model-written summary
In the field experiment, soil drying treatments caused no significant reduction in grain yield or N uptake of rice on unfertilized plots.
- Taxon
- riceOryza sativat0
- Treatment
- soil drying treatmentse0
- Outcome
- grain yield or N uptakee0
- Direction
- absence of any significant reductione0
- Qualifier
- unfertilized plotse0
- Comparator
- continuous floodinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“The results confirmed the absence of any significant reduction in grain yield or N uptake as a result of any of the soil drying treatments during the growing season on the unfertilized plots carrying a rice crop”
e1“continuous flooding alternate flooding and soil drying every 2 weeks”
Claim · model-written summary
On plots fertilized with 100 or 200 kg N/ha, alternate flooding and drying significantly depressed both grain yield and N uptake of rice.
- Taxon
- riceOryza sativat0
- Treatment
- alternate flooding and dryinge0
- Outcome
- grain yield and N uptakee0
- Direction
- depressione0
- Qualifier
- plots fertilized with 100 or 200 kg N/nae0
- Comparator
- continuous floodinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“On the plots fertilized with 100 or 200 kg N/na, alternate flooding and drying resulted in a significant depression in both grain yield and N uptake”
e1“continuous flooding alternate flooding and soil drying every 2 weeks”
Claim · model-written summary
Soil analysis supported heavy N losses in fertilized plots under alternate flooding and soil drying, apparently through nitrification and denitrification.
- Taxon
- riceOryza sativat0
- Outcome
- heavy losses of Ne0
- Qualifier
- apparently by nitrification and denitrification reactionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Soil analysis supported heavy losses of N in the fertilized plots that underwent alternate flooding and soil drying apparently by nitrification and denitrification reactions”
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