Abstract
Abstract One of the main problems of lowering crops production on degraded soils is the low soil organic matter. Application of humic substances may improve the quality of degraded soils. The objectives of this research were to study the effect of humic substances application on the production of rice, water spinach, sweet potato, and oil palm, and to describe the mechanism of increasing crops production due to the application of humic substances. In this study, the humic substances were extracted from soft brown coal using a strong base KOH. Humic substances in difference doses are applied to various soil types for several crops. The results showed that application of humic substances increased the production of rice, water spinach, sweet potato, and oil palm. The highest production increase is obtained with a dose of 10-15 liters of the humic substance/ha with a carrier zeolite of 10-20 kg/liter of humic substances. The application of humic substances to soils increases the nutrients available in the soils as well as the the growth of plant roots so that plants can absorb more nutrients from the soils.
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Claims 7
Claim · model-written summary
Humic substances increased rice production.
- Taxon
- rice
Oryza sativae0 - Treatment
- application of humic substancese0
- Outcome
- productione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of humic substances increased the production of rice, water spinach, sweet potato, and oil palm”
Claim · model-written summary
Humic substances increased water spinach production.
- Taxon
- water spinache0
- Treatment
- application of humic substancese0
- Outcome
- productione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“application of humic substances increased the production of rice, water spinach, sweet potato, and oil palm”
Claim · model-written summary
Humic substances increased sweet potato production.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase0 - Treatment
- application of humic substancese0
- Outcome
- productione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“application of humic substances increased the production of rice, water spinach, sweet potato, and oil palm”
Claim · model-written summary
Humic substances increased oil palm production.
Not reportedComparator
Verbatim
e0“application of humic substances increased the production of rice, water spinach, sweet potato, and oil palm”
Claim · model-written summary
The largest production increase used 10-15 liters of humic substance per hectare with zeolite carrier.
Verbatim
e0“highest production increase is obtained with a dose of 10-15 liters of the humic substance/ha with a carrier zeolite of 10-20 kg/liter of humic substances”
t0“crops production”
Claim · model-written summary
Humic substance application increased soil nutrient availability.
Verbatim
e0“application of humic substances to soils increases the nutrients available in the soils”
t0“crops production”
Claim · model-written summary
Humic substance application increased plant root growth and thereby nutrient uptake.
Verbatim
e0“application of humic substances to soils increases the nutrients available in the soils as well as the the growth of plant roots so that plants can absorb more nutrients from the soils”
t0“crops production”
The same questions in other papers
other · yield · Oryza sativa (rice)Positive and negative results
160 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- no effect
- no effect
162 papers more in this group
See all 166 papers →other · yield · Ipomoea batatas (sweet potato)Results agree
11 papers in the same direction as this paper
- positive
- positive
- positive
8 papers more in this group
See all 12 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.