Abstract
This study was conducted to evaluate the potential of natural rock powder (NRP), derived from potassium (K) feldspar, as an eco-friendly K fertilizer for onion (Allium cepa L.) cultivation under vinyl mulching conditions.The experimental design included a mineral fertilizer control and various NRP treatments (standard rate, double rate, micro-particles, and foliar application).The results showed no significant differences in onion fresh weight or bulb diameter across all treatments, suggesting that NRP can support basic crop growth.However, the K content in plant tissues was lower in NRP-treated plots compared to the control, with significant reductions observed in the NRP-2 and NRP-MP groups.This lower K uptake is attributed to the low solubility of NRP and its tendency to remain on the mulch surface during top-dressing, which limits nutrient penetration into the soil.Lab-scale elution tests confirmed that the control released approximately twice as much cumulative K as the NRP treatments, although Si release was comparable due to the mineral composition of the raw material.While NRP shows promise as a sustainable K source, enhancing its solubility through formulation improvements or specialized application methods is essential to optimize its efficacy in plastic-mulched cropping systems.
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Claims 9
Claim · model-written summary
Onion fresh weight did not differ significantly among fertilizer treatments.
- Taxon
- onion
Allium cepae0 - Treatment
- natural rock powder (NRP)e1
- Outcome
- onion fresh weighte0
- Direction
- no significant differencese0
- Comparator
- mineral fertilizer controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences in onion fresh weight or bulb diameter across all treatments”
e1“natural rock powder (NRP), derived from potassium (K) feldspar”
e2“a mineral fertilizer control”
Claim · model-written summary
Onion bulb diameter did not differ significantly among treatments.
- Taxon
- onionAllium cepae0
- Treatment
- natural rock powder (NRP)e1
- Outcome
- bulb diametere0
- Direction
- no significant differencese0
- Comparator
- mineral fertilizer controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences in onion fresh weight or bulb diameter across all treatments”
e1“natural rock powder (NRP), derived from potassium (K) feldspar”
e2“a mineral fertilizer control”
Claim · model-written summary
Plant tissue K content was lower with NRP than with mineral fertilizer.
- Taxon
- onion (Allium cepa L.)Allium cepae1
- Treatment
- NRP-treated plotse0
- Outcome
- K content in plant tissuese0
- Direction
- lowere0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the K content in plant tissues was lower in NRP-treated plots compared to the control”
e1“onion (Allium cepa L.)”
Claim · model-written summary
NRP-2 significantly reduced plant tissue K content relative to control.
- Taxon
- onion (Allium cepa L.)Allium cepae1
- Treatment
- NRP-2e0
- Outcome
- K content in plant tissuese0
- Direction
- reductionse0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the K content in plant tissues was lower in NRP-treated plots compared to the control, with significant reductions observed in the NRP-2 and NRP-MP groups”
e1“onion (Allium cepa L.)”
Claim · model-written summary
NRP-MP significantly reduced plant tissue K content relative to control.
- Taxon
- onion (Allium cepa L.)Allium cepae1
- Treatment
- NRP-MPe0
- Outcome
- K content in plant tissuese0
- Direction
- reductionse0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the K content in plant tissues was lower in NRP-treated plots compared to the control, with significant reductions observed in the NRP-2 and NRP-MP groups”
e1“onion (Allium cepa L.)”
Claim · model-written summary
Lower K uptake was attributed to low NRP solubility and retention on mulch during top dressing.
- Taxon
- onion (Allium cepa L.)Allium cepae1
- Outcome
- lower K uptakee0
- Qualifier
- low solubility of NRP and its tendency to remain on the mulch surface during top-dressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This lower K uptake is attributed to the low solubility of NRP and its tendency to remain on the mulch surface during top-dressing, which limits nutrient penetration into the soil.”
e1“onion (Allium cepa L.)”
Claim · model-written summary
Mineral fertilizer released about twice the cumulative K of NRP in laboratory elution tests.
- Taxon
- onion (Allium cepa L.)Allium cepae1
- Outcome
- cumulative Ke0
- Value
- approximately twicee0
- Comparator
- NRP treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lab-scale elution tests confirmed that the control released approximately twice as much cumulative K as the NRP treatments”
e1“onion (Allium cepa L.)”
Claim · model-written summary
Si release from the control and NRP treatments was comparable in elution tests.
- Taxon
- onion (Allium cepa L.)Allium cepae2
- Outcome
- Si releasee0
- Direction
- comparablee0
- Comparator
- NRP treatmentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although Si release was comparable due to the mineral composition of the raw material”
e1“the control released approximately twice as much cumulative K as the NRP treatments”
e2“onion (Allium cepa L.)”
Claim · model-written summary
The authors recommend improving NRP solubility or application methods for plastic-mulched crops.
- Taxon
- onion (Allium cepa L.)Allium cepae1
- Outcome
- enhancing its solubility through formulation improvements or specialized application methodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhancing its solubility through formulation improvements or specialized application methods is essential to optimize its efficacy in plastic-mulched cropping systems”
e1“onion (Allium cepa L.)”
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See all 89 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.