The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa pods
Purpose Nitrogen loss as ammonia (NH3) in a waste cocoa pod co-composting process was determined following the addition of three potential chemical amendments that could lower NH3 loss. Further, amended compost products were assessed for quality and possible phytotoxicity in a pot experiment. Metho...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
OICC Press
2024-01-01
|
| Series: | International Journal of Recycling of Organic Waste in Agriculture |
| Subjects: | |
| Online Access: | https://oiccpress.com/ijrowa/article/view/3352 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832543035775254528 |
|---|---|
| author | Rokotamana Vitinaqailevu B. K. Rajashekhar Rao |
| author_facet | Rokotamana Vitinaqailevu B. K. Rajashekhar Rao |
| author_sort | Rokotamana Vitinaqailevu |
| collection | DOAJ |
| description | Purpose Nitrogen loss as ammonia (NH3) in a waste cocoa pod co-composting process was determined following the addition of three potential chemical amendments that could lower NH3 loss. Further, amended compost products were assessed for quality and possible phytotoxicity in a pot experiment.
Method Pod borer damaged cocoa pods were co-composted in lab-scale vessels under ambient conditions with double superphosphate, phosphoric acid, and gypsum at 2%, 5% and 1% of fresh weight, respectively. NH3 emitted during composting was trapped in standard H2SO4 and determined titrimetrically. Composting mixtures were sampled on days 0, 7, 56 and 90 to monitor pH, total C, total N, and C:N ratio. Mature co-composts were incorporated to the soil at 20 t haâ1 and growth response of Chinese cabbage plants (Brassica rapa chinensis) assessed for the phytotoxicity.
Results The chemical amendments were ineffective (pâ>â0.05) in preventing loss of NH3 but the quality of composting mixtures were significantly (pâ<â0.0001) improved. The manure compost generated had acceptable parameters (C, 31.2â31.9% and C:N ratio, 9â10:1) and were free from phytotoxicity for soil application as revealed by the response of Chinese cabbage crop.
Conclusion Chemical amendments used in the co-composting process mainly modulated pH without any detrimental effects on quality. The results also demonstrated that the NH3 loss is insignificant from the cocoa waste-composting process. Further studies are required with increased rates of acidifying amendments like phosphoric acid to further augment the quality of cocoa pod composts. |
| format | Article |
| id | doaj-art-ae2fcda6f9d8442386f2dd3a8d17234b |
| institution | Kabale University |
| issn | 2195-3228 2251-7715 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | OICC Press |
| record_format | Article |
| series | International Journal of Recycling of Organic Waste in Agriculture |
| spelling | doaj-art-ae2fcda6f9d8442386f2dd3a8d17234b2025-02-03T11:59:51ZengOICC PressInternational Journal of Recycling of Organic Waste in Agriculture2195-32282251-77152024-01-018410.1007/s40093-019-0285-3The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa podsRokotamana Vitinaqailevu0B. K. Rajashekhar Rao1Department of Agriculture, The PNG University of Technology, Lae, Papua New GuineaDepartment of Agriculture, The PNG University of Technology, Lae, Papua New GuineaPurpose Nitrogen loss as ammonia (NH3) in a waste cocoa pod co-composting process was determined following the addition of three potential chemical amendments that could lower NH3 loss. Further, amended compost products were assessed for quality and possible phytotoxicity in a pot experiment. Method Pod borer damaged cocoa pods were co-composted in lab-scale vessels under ambient conditions with double superphosphate, phosphoric acid, and gypsum at 2%, 5% and 1% of fresh weight, respectively. NH3 emitted during composting was trapped in standard H2SO4 and determined titrimetrically. Composting mixtures were sampled on days 0, 7, 56 and 90 to monitor pH, total C, total N, and C:N ratio. Mature co-composts were incorporated to the soil at 20 t haâ1 and growth response of Chinese cabbage plants (Brassica rapa chinensis) assessed for the phytotoxicity. Results The chemical amendments were ineffective (pâ>â0.05) in preventing loss of NH3 but the quality of composting mixtures were significantly (pâ<â0.0001) improved. The manure compost generated had acceptable parameters (C, 31.2â31.9% and C:N ratio, 9â10:1) and were free from phytotoxicity for soil application as revealed by the response of Chinese cabbage crop. Conclusion Chemical amendments used in the co-composting process mainly modulated pH without any detrimental effects on quality. The results also demonstrated that the NH3 loss is insignificant from the cocoa waste-composting process. Further studies are required with increased rates of acidifying amendments like phosphoric acid to further augment the quality of cocoa pod composts.https://oiccpress.com/ijrowa/article/view/3352C:N ratioCumulative NH3 lossPhytotoxicityVolatilization |
| spellingShingle | Rokotamana Vitinaqailevu B. K. Rajashekhar Rao The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa pods International Journal of Recycling of Organic Waste in Agriculture C:N ratio Cumulative NH3 loss Phytotoxicity Volatilization |
| title | The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa pods |
| title_full | The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa pods |
| title_fullStr | The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa pods |
| title_full_unstemmed | The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa pods |
| title_short | The role of chemical amendments on modulating ammonia loss and quality parameters of coâcomposts from waste cocoa pods |
| title_sort | role of chemical amendments on modulating ammonia loss and quality parameters of coacomposts from waste cocoa pods |
| topic | C:N ratio Cumulative NH3 loss Phytotoxicity Volatilization |
| url | https://oiccpress.com/ijrowa/article/view/3352 |
| work_keys_str_mv | AT rokotamanavitinaqailevu theroleofchemicalamendmentsonmodulatingammonialossandqualityparametersofcoacompostsfromwastecocoapods AT bkrajashekharrao theroleofchemicalamendmentsonmodulatingammonialossandqualityparametersofcoacompostsfromwastecocoapods AT rokotamanavitinaqailevu roleofchemicalamendmentsonmodulatingammonialossandqualityparametersofcoacompostsfromwastecocoapods AT bkrajashekharrao roleofchemicalamendmentsonmodulatingammonialossandqualityparametersofcoacompostsfromwastecocoapods |