Abstract
Environmental resources for rainfed rice production show large variability even within a small area in Northeast Thailand, and it is said that farmer’s management is well adapted to the variability. This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity. The effect of transplanting date and N fertilizer rate on rice productivity was analyzed by investigating rice growth, and also by dividing rainfed rice fields located in a mini-watershed into 4 subecosystems: (1) medium deep water, waterlogged (MDW), (2) shallow water, favorable (SWf), (3) shallow water, drought- and submergence-prone (SWds), and (4) shallow water, drought-prone (SWd). Rice grew at almost a constant rate until maturity and the growth rate was higher at a lower field. The difference in productivity was derived from not only a water condition but also soil fertility, and was associated with the rate of N uptake. Small leaf area index was found to be one of the causes for low productivity in rice. Statistic analysis showed that earlier transplanting increased biomass production in all subecosystems. The biomass-increase resulted in a higher yield in SWds and SWd fields while it resulted in a reduced harvest index (HI) and did not increase yield in MDW and SWf fields. The effect of N fertilizer was apparent in the field where rice biomass was small due to later transplanting or unfertile soil, but the effect was generally small. Earlier transplanting in upper fields and later transplanting in lower fields in mini-watersheds were suggested to improve rice production, and proper distribution of N fertilizer use is considered necessary.
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Claims 11
Claim · model-written summary
Earlier transplanting increased rice biomass production in all subecosystems
- Taxon
- rice
Oryza sativae1 - Treatment
- earlier transplantinge2
- Outcome
- biomass productione2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e2“Statistic analysis showed that earlier transplanting increased biomass production in all subecosystems”
Claim · model-written summary
Biomass increase gave a higher rice yield in SWds and SWd fields
- Taxon
- riceOryza sativae1
- Outcome
- yielde3
- Direction
- highere3
- Setting
- SWds and SWd fieldse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e3“The biomass-increase resulted in a higher yield in SWds and SWd fields while it resulted in a reduced harvest index (HI) and did not increase yield in MDW and SWf fields”
Claim · model-written summary
Harvest index was reduced in MDW and SWf fields with biomass increase
- Taxon
- riceOryza sativae1
- Outcome
- harvest index (HI)e3
- Direction
- reducede3
- Setting
- MDW and SWf fieldse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e3“The biomass-increase resulted in a higher yield in SWds and SWd fields while it resulted in a reduced harvest index (HI) and did not increase yield in MDW and SWf fields”
Claim · model-written summary
Biomass increase did not increase rice yield in MDW and SWf fields
- Taxon
- riceOryza sativae1
- Outcome
- yielde3
- Direction
- did not increasee3
- Setting
- MDW and SWf fieldse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e3“The biomass-increase resulted in a higher yield in SWds and SWd fields while it resulted in a reduced harvest index (HI) and did not increase yield in MDW and SWf fields”
Claim · model-written summary
Effect of N fertilizer on rice was apparent only where biomass was small, and was generally small
- Taxon
- riceOryza sativae1
- Treatment
- N fertilizere4
- Outcome
- effect of N fertilizere4
- Direction
- smalle4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e4“The effect of N fertilizer was apparent in the field where rice biomass was small due to later transplanting or unfertile soil, but the effect was generally small”
Claim · model-written summary
Small leaf area index was one of the causes of low rice productivity
- Taxon
- riceOryza sativae1
- Outcome
- low productivitye5
- Qualifier
- Small leaf area indexe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e5“Small leaf area index was found to be one of the causes for low productivity in rice”
Claim · model-written summary
Productivity difference in rice was derived from water condition and soil fertility
- Taxon
- riceOryza sativae1
- Outcome
- difference in productivitye6
- Qualifier
- not only a water condition but also soil fertilitye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e6“The difference in productivity was derived from not only a water condition but also soil fertility, and was associated with the rate of N uptake”
Claim · model-written summary
Rice grew at an almost constant rate until maturity
- Taxon
- riceOryza sativae1
- Outcome
- growth ratee7
- Qualifier
- almost a constant rate until maturitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e7“Rice grew at almost a constant rate until maturity and the growth rate was higher at a lower field”
Claim · model-written summary
Rice growth rate was higher at a lower field
- Taxon
- riceOryza sativae1
- Outcome
- growth ratee7
- Direction
- highere7
- Setting
- lower fielde7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity”
e7“Rice grew at almost a constant rate until maturity and the growth rate was higher at a lower field”
Claim · model-written summary
Earlier transplanting in upper fields and later transplanting in lower fields is suggested to improve rice production
- Taxon
- riceOryza sativae3
- Treatment
- Earlier transplanting in upper fieldse3
- Outcome
- rice productione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Earlier transplanting in upper fields and later transplanting in lower fields in mini-watersheds were suggested to improve rice production, and proper distribution of N fertilizer use is considered necessary”
Claim · model-written summary
Proper distribution of N fertilizer use is considered necessary for rice
- Taxon
- riceOryza sativae3
- Outcome
- proper distribution of N fertilizer usee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Earlier transplanting in upper fields and later transplanting in lower fields in mini-watersheds were suggested to improve rice production, and proper distribution of N fertilizer use is considered necessary”
The same questions in other papers
transplanting · yield · Oryza sativa (rice)Positive and negative results
921 papers in the same direction as this paper · 132 in the opposite direction · 24 reporting no difference from an alternative
- positive
- positive
- no effect
1,074 papers more in this group
See all 1,078 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.