Abstract
Importance of the work: Burnt rice husk (BRH), a valuable organic amendment that contains high potassium (K), can be a low-cost, alternative source of K for cassava in low K-reserve soils.Objectives: To investigate the growth, yield and nutrient uptake of cassava in response to the application rate of BRH and K-fertilizer.Materials & Methods: A field experiment was conducted in a K-deficient sandy soil based on a split plot design with fours levels of BRH applied (0 t/ha, 6.25 t/ha, 12.5 t/ha or 25.0 t/ha) in the main plot and six levels of K fertilizer (0 kg K 2 O/ha, 25 kg K 2 O/ha, 50 kg K 2 O/ha, 75 kg K 2 O/ha, 100 kg K 2 O/ha or 125 kg K 2 O/ha) in the subplot. Results:The fresh tuber yield (FTY) obtained from the control plot was not significantly different from the plots added with a sole application of BRH or K fertilizer at all rates; however, BRH significantly increased soil K availability.Across all combined rates of BRH and K fertilizer, cassava produced significantly greater FTY by 62.6-170% over the control, where the highest yield was from the plot amended with 12.5 t/ha BRH and 100 kg K 2 O/ha.The use of 25.0 t/ha of BRH together with K fertilizer reduced the uptake of Mg and Ca, resulting in a significant adverse decrease in the FTY.There was no clear interactive impact of BRH and K fertilizer on the starch yield and aboveground biomass, though it did stimulate the uptake of some plant nutrients.Main finding: BRH application increased soil K and partially substituted for applied K in cassava growth; however, K fertilizer was still required when BRH was applied at a low rate (less than 12.5 t/ha).
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Claims 13
Claim · model-written summary
Sole burnt rice husk application did not significantly change fresh tuber yield relative to the control.
- Taxon
- cassava
Manihot esculentat0 - Treatment
- sole application of BRHe0
- Outcome
- fresh tuber yield (FTY)e0
- Comparator
- control plote0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fresh tuber yield (FTY) obtained from the control plot was not significantly different from the plots added with a sole application of BRH or K fertilizer at all rates”
t0“cassava”
Claim · model-written summary
Sole potassium fertilizer application did not significantly change fresh tuber yield relative to the control.
- Taxon
- cassavaManihot esculentat0
- Treatment
- K fertilizer at all ratese0
- Outcome
- fresh tuber yield (FTY)e0
- Comparator
- control plote0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fresh tuber yield (FTY) obtained from the control plot was not significantly different from the plots added with a sole application of BRH or K fertilizer at all rates”
t0“cassava”
Claim · model-written summary
Burnt rice husk increased soil potassium availability.
- Taxon
- cassavaManihot esculentat0
- Treatment
- BRHe0
- Outcome
- soil K availabilitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BRH significantly increased soil K availability”
t0“cassava”
Claim · model-written summary
Combined burnt rice husk and potassium fertilizer rates increased fresh tuber yield by 62.6-170% over the control.
- Taxon
- cassavaManihot esculentat0
- Treatment
- combined rates of BRH and K fertilizere0
- Outcome
- FTYe0
- Direction
- greatere0
- Value
- 62.6-170%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across all combined rates of BRH and K fertilizer, cassava produced significantly greater FTY by 62.6-170% over the control”
t0“cassava”
Claim · model-written summary
The highest fresh tuber yield occurred with 12.5 t/ha burnt rice husk and 100 kg K 2 O/ha.
- Taxon
- cassavaManihot esculentat0
- Treatment
- 12.5 t/ha BRH and 100 kg K 2 O/hae0
- Outcome
- yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest yield was from the plot amended with 12.5 t/ha BRH and 100 kg K 2 O/ha”
t0“cassava”
Claim · model-written summary
Using 25.0 t/ha burnt rice husk with potassium fertilizer reduced magnesium uptake.
- Taxon
- cassavaManihot esculentat0
- Treatment
- 25.0 t/ha of BRH together with K fertilizere0
- Outcome
- uptake of Mge0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of 25.0 t/ha of BRH together with K fertilizer reduced the uptake of Mg and Ca”
t0“cassava”
Claim · model-written summary
Using 25.0 t/ha burnt rice husk with potassium fertilizer reduced calcium uptake.
- Taxon
- cassavaManihot esculentat0
- Treatment
- 25.0 t/ha of BRH together with K fertilizere0
- Outcome
- Cae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of 25.0 t/ha of BRH together with K fertilizer reduced the uptake of Mg and Ca”
t0“cassava”
Claim · model-written summary
Using 25.0 t/ha burnt rice husk with potassium fertilizer significantly reduced fresh tuber yield.
- Taxon
- cassavaManihot esculentat0
- Treatment
- 25.0 t/ha of BRH together with K fertilizere0
- Outcome
- FTYe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of 25.0 t/ha of BRH together with K fertilizer reduced the uptake of Mg and Ca, resulting in a significant adverse decrease in the FTY”
t0“cassava”
Claim · model-written summary
The interaction of burnt rice husk and potassium fertilizer had no clear effect on starch yield.
- Taxon
- cassavaManihot esculentat0
- Treatment
- BRH and K fertilizere0
- Outcome
- starch yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no clear interactive impact of BRH and K fertilizer on the starch yield and aboveground biomass”
t0“cassava”
Claim · model-written summary
The interaction of burnt rice husk and potassium fertilizer had no clear effect on aboveground biomass.
- Taxon
- cassavaManihot esculentat0
- Treatment
- BRH and K fertilizere0
- Outcome
- aboveground biomasse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no clear interactive impact of BRH and K fertilizer on the starch yield and aboveground biomass”
t0“cassava”
Claim · model-written summary
The combined treatment stimulated uptake of some plant nutrients.
- Taxon
- cassavaManihot esculentat0
- Outcome
- uptake of some plant nutrientse0
- Direction
- stimulatee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“though it did stimulate the uptake of some plant nutrients”
t0“cassava”
Claim · model-written summary
Burnt rice husk partly substituted for applied potassium in cassava growth.
- Taxon
- cassavaManihot esculentat0
- Treatment
- BRH applicatione0
- Outcome
- cassava growthe0
- Direction
- partially substitutede0
- Comparator
- applied Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BRH application increased soil K and partially substituted for applied K in cassava growth”
t0“cassava”
Claim · model-written summary
Potassium fertilizer remained necessary when burnt rice husk was applied below 12.5 t/ha.
- Taxon
- cassavaManihot esculentat0
- Treatment
- BRHe0
- Outcome
- K fertilizer was still requirede0
- Qualifier
- less than 12.5 t/hae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K fertilizer was still required when BRH was applied at a low rate (less than 12.5 t/ha)”
t0“cassava”
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See all 153 papers →8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.