Abstract
The purpose of this research was to gain a technological breakthrough in controlling Fe toxicity (Fe2+) on Ultisol in a new established rice field by using humic acid from rice straw compost and water management, so that optimal production of rice plants could be achieved. The experiment was designed using a 2 × 4 factorials with 3 replications in a split plot design. The main plot was water management consists of 2 levels: continuous and intermittent irrigation (2 weeks flooded and 2 weeks field capacity). Small plot was humic acid which was extracted from rice straw compost by NaOH 0.5 N which consists of 4 levels: 0, 200, 400, and 600 mg kg-1. The results showed that applications of humic acid from 0 to 600 mg kg-1 that was followed by 2 weeks of intermittent irrigation decreased Fe2+ concentration. It was approaching levels that were not toxic to plants, with soil Fe2+ between 180-250 mg kg-1. The best treatment was found at the application of 600 mg kg-1 humic acid extracted from rice straw compost combined with 2 week flooded – 2 weeks field capacity of water management. Those treatment decreased Fe2+ concentration from 1,614 to 180 mg kg-1 and increased the dry weight of grain from 5.15 to 16.73 g pot-1 compared to continuous flooding and without humic acid application.
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Claims 3
Claim · model-written summary
Humic acid at 600 mg kg-1 with 2 weeks flooded and 2 weeks field capacity water management decreased Fe2+ concentration from 1,614 to 180 mg kg-1 compared with continuous flooding without humic acid
- Taxon
- rice plants
Oryza sativae0 - Treatment
- 600 mg kg-1 humic acid extracted from rice straw compost combined with 2 week flooded – 2 weeks field capacity of water managemente2
- Outcome
- Fe2+ concentratione1
- Direction
- decreasede1
- Value
- 1,614 to 180 mg kg-1e1
- Comparator
- continuous flooding and without humic acid applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimal production of rice plants”
e1“Those treatment decreased Fe2+ concentration from 1,614 to 180 mg kg-1 and increased the dry weight of grain from 5.15 to 16.73 g pot-1 compared to continuous flooding and without humic acid application”
e2“The best treatment was found at the application of 600 mg kg-1 humic acid extracted from rice straw compost combined with 2 week flooded – 2 weeks field capacity of water management”
Claim · model-written summary
Humic acid applied at 0 to 600 mg kg-1 followed by 2 weeks of intermittent irrigation decreased Fe2+ concentration to soil levels of 180-250 mg kg-1, approaching levels not toxic to plants
- Taxon
- rice plantsOryza sativae0
- Treatment
- applications of humic acid from 0 to 600 mg kg-1 that was followed by 2 weeks of intermittent irrigatione1
- Outcome
- Fe2+ concentratione1
- Direction
- decreasede1
- Value
- 180-250 mg kg-1e3
- Qualifier
- approaching levels that were not toxic to plantse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimal production of rice plants”
e1“The results showed that applications of humic acid from 0 to 600 mg kg-1 that was followed by 2 weeks of intermittent irrigation decreased Fe2+ concentration”
e3“It was approaching levels that were not toxic to plants, with soil Fe2+ between 180-250 mg kg-1”
Claim · model-written summary
Humic acid at 600 mg kg-1 with 2 weeks flooded and 2 weeks field capacity water management increased rice grain dry weight from 5.15 to 16.73 g pot-1 compared with continuous flooding without humic acid
- Taxon
- rice plantsOryza sativae0
- Treatment
- 600 mg kg-1 humic acid extracted from rice straw compost combined with 2 week flooded – 2 weeks field capacity of water managemente2
- Outcome
- dry weight of graine1
- Direction
- increasede1
- Value
- 5.15 to 16.73 g pot-1e1
- Comparator
- continuous flooding and without humic acid applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimal production of rice plants”
e1“Those treatment decreased Fe2+ concentration from 1,614 to 180 mg kg-1 and increased the dry weight of grain from 5.15 to 16.73 g pot-1 compared to continuous flooding and without humic acid application”
e2“The best treatment was found at the application of 600 mg kg-1 humic acid extracted from rice straw compost combined with 2 week flooded – 2 weeks field capacity of water management”
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