Datasets:

chemiseed
/

tropical-cover-crop-performance-malaysia

Error code:   StreamingRowsError
Exception:    CastError
Message:      Couldn't cast
record_id: string
species: string
country: string
region_state: string
crop_system: string
soil_type: string
climate_zone: string
year_of_study: int64
biomass_dry_weight_tha: double
n_fixation_kgha: double
coverage_percentage: double
establishment_time_weeks: double
seed_rate_kgha: double
source_author: string
source_title: string
source_journal: string
source_year: int64
doi_or_url: string
notes: string
study_id: null
region: null
year_range: null
seeding_rate_kg_ha: null
establishment_days: null
n_fixation_kg_ha_yr: null
source_citation: null
-- schema metadata --
pandas: '{"index_columns": [{"kind": "range", "name": null, "start": 0, "' + 2637
to
{'study_id': Value('string'), 'species': Value('string'), 'crop_system': Value('string'), 'region': Value('string'), 'year_range': Value('string'), 'seeding_rate_kg_ha': Value('string'), 'establishment_days': Value('string'), 'n_fixation_kg_ha_yr': Value('string'), 'source_citation': Value('string')}
because column names don't match
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/utils.py", line 99, in get_rows_or_raise
                  return get_rows(
                         ^^^^^^^^^
                File "/src/libs/libcommon/src/libcommon/utils.py", line 272, in decorator
                  return func(*args, **kwargs)
                         ^^^^^^^^^^^^^^^^^^^^^
                File "/src/services/worker/src/worker/utils.py", line 77, in get_rows
                  rows_plus_one = list(itertools.islice(ds, rows_max_number + 1))
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 2690, in __iter__
                  for key, example in ex_iterable:
                                      ^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 2227, in __iter__
                  for key, pa_table in self._iter_arrow():
                                       ^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 2260, in _iter_arrow
                  pa_table = cast_table_to_features(pa_table, self.features)
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/table.py", line 2223, in cast_table_to_features
                  raise CastError(
              datasets.table.CastError: Couldn't cast
              record_id: string
              species: string
              country: string
              region_state: string
              crop_system: string
              soil_type: string
              climate_zone: string
              year_of_study: int64
              biomass_dry_weight_tha: double
              n_fixation_kgha: double
              coverage_percentage: double
              establishment_time_weeks: double
              seed_rate_kgha: double
              source_author: string
              source_title: string
              source_journal: string
              source_year: int64
              doi_or_url: string
              notes: string
              study_id: null
              region: null
              year_range: null
              seeding_rate_kg_ha: null
              establishment_days: null
              n_fixation_kg_ha_yr: null
              source_citation: null
              -- schema metadata --
              pandas: '{"index_columns": [{"kind": "range", "name": null, "start": 0, "' + 2637
              to
              {'study_id': Value('string'), 'species': Value('string'), 'crop_system': Value('string'), 'region': Value('string'), 'year_range': Value('string'), 'seeding_rate_kg_ha': Value('string'), 'establishment_days': Value('string'), 'n_fixation_kg_ha_yr': Value('string'), 'source_citation': Value('string')}
              because column names don't match

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Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems (2000-2025)

A compiled meta-dataset of 50 field-trial records covering tropical leguminous cover crop performance under oil palm, rubber, fruit-tree, and smallholder mixed cropping systems across Malaysia, Indonesia, the Philippines, and adjacent Southeast Asia.

At a glance

Records: 50
Time range: 2000-2025
Geographic coverage: Peninsular Malaysia, Sabah / Sarawak, Kalimantan, Sumatra, Mindanao, Luzon, Thailand, Vietnam
License: CC-BY 4.0 (open, attribution required)
Maintainer: Chemiseed Sdn. Bhd., Malaysia
Canonical citation DOI: 10.5281/zenodo.20244236

Species covered

Mucuna bracteata (MB): the workhorse legume for oil palm immature cover
Calopogonium mucunoides: fast-establishing pioneer
Calopogonium caeruleum: shade-tolerant alternative for older plantings
Centrosema pubescens: drought-resistant grazing-compatible legume
Pueraria javanica (synonym Pueraria phaseoloides): high-biomass nitrogen fixer
SoilBoost EA application studies: humic acid soil conditioner from Chemiseed Sdn. Bhd.

Files

tropical-cover-crop-performance-dataset.csv: the meta-dataset, 50 rows by 9 columns
Methodology-and-Data-Description.pdf: full methodology, inclusion criteria, source bibliography

Citation

@dataset{abdul_2026_chemiseed_tropical_cover_crops,
  author    = {Abdul, Shaharil and {Chemiseed Sdn. Bhd.}},
  title     = {Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems: A Compiled Meta-Dataset (2000-2025)},
  year      = {2026},
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.20244236},
  url       = {https://doi.org/10.5281/zenodo.20244236},
  version   = {1.0}
}

Companion code

The open-source calculator toolkit that uses this dataset for seed-rate and climate-suitability scoring: github.com/chemiseedkudzuseeds/tropical-cover-crop-calculator

Live demo (in-browser, no setup): https://chemiseedkudzuseeds.github.io/tropical-cover-crop-calculator/

Background reading and field notes

Companion long-form field notes from the maintainers at Chemiseed Field Notes on Substack. Selected issues that pair with this dataset:

Why I started Chemiseed: origin story on the gap between certified seed and what actually reaches a plantation block.
What Mucuna bracteata actually does in an immature oil palm field: six-week seedlings, 320 per hectare, 67 to 84 percent Ndfa, the real MPOB numbers.
Pueraria javanica is not invasive kudzu: species disambiguation between Pueraria phaseoloides and Pueraria montana.
A confession about Calopogonium mucunoides: when CM is the right call and when it is not.
What plantation managers ask me first about SoilBoost EA: four mechanisms, two soils where it works, one soil where it does not.
Cover crop costs are not what you think: RM-per-hectare breakdown on a 50 ha block, three strategies compared.
The smallholder problem: cover crops are technically simple, economically hard at smallholder scale.
What we got wrong about seed dormancy in Centrosema pubescens: hard-seed dormancy and field versus lab germination.
EUDR is coming. Cover crops are not a compliance hack.: practitioner read on EU Deforestation Regulation and cover crops.
A field guide year: how I would plant 100 ha of cover crops if I were starting today: month-by-month plan with species choice, seeding rates, and cost lines.

Source bibliography

The 50 records are compiled from peer-reviewed and grey-literature sources including MPOB (Malaysian Palm Oil Board), RRIM (Rubber Research Institute of Malaysia), Pertanika JTAS, PORIM, CIAT, and FAO publications. Full bibliography in the Methodology PDF.

Maintainer contact

Chemiseed Sdn. Bhd., Kuala Lumpur, Malaysia. shaharil@chemiseed.com - https://chemiseed.com

license: cc-by-4.0 language: - en tags: - agriculture - tropical-agriculture - cover-crops - malaysia - oil-palm - rubber - soil-health - nitrogen-fixation - agronomy - southeast-asia pretty_name: Tropical Cover Crop Performance Meta-Dataset size_categories: - n<1K source_datasets: - original task_categories: - table-question-answering - text-classification dataset_info: features: - name: study_id dtype: string - name: species dtype: string - name: crop_system dtype: string - name: region dtype: string - name: year_range dtype: string - name: seeding_rate_kg_ha dtype: string - name: establishment_days dtype: string - name: n_fixation_kg_ha_yr dtype: string - name: source_citation dtype: string

Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems (2000-2025)

At a glance

Records: 50
Time range: 2000-2025
Geographic coverage: Peninsular Malaysia, Sabah / Sarawak, Kalimantan, Sumatra, Mindanao, Luzon, Thailand, Vietnam
License: CC-BY 4.0 (open, attribution required)
Maintainer: Chemiseed Sdn. Bhd., Malaysia
Canonical citation DOI: 10.5281/zenodo.20244236

Species covered

Mucuna bracteata (MB): the workhorse legume for oil palm immature cover
Calopogonium mucunoides: fast-establishing pioneer
Calopogonium caeruleum: shade-tolerant alternative for older plantings
Centrosema pubescens: drought-resistant grazing-compatible legume
Pueraria javanica (synonym Pueraria phaseoloides): high-biomass nitrogen fixer
SoilBoost EA application studies: humic acid soil conditioner from Chemiseed Sdn. Bhd.

Files

tropical-cover-crop-performance-dataset.csv: the meta-dataset, 50 rows by 9 columns
Methodology-and-Data-Description.pdf: full methodology, inclusion criteria, source bibliography

Citation

@dataset{abdul_2026_chemiseed_tropical_cover_crops,
  author    = {Abdul, Shaharil and {Chemiseed Sdn. Bhd.}},
  title     = {Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems: A Compiled Meta-Dataset (2000-2025)},
  year      = {2026},
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.20244236},
  url       = {https://doi.org/10.5281/zenodo.20244236},
  version   = {1.0}
}

Companion code

The open-source calculator toolkit that uses this dataset for seed-rate and climate-suitability scoring: github.com/chemiseedkudzuseeds/tropical-cover-crop-calculator

Live demo (in-browser, no setup): https://chemiseedkudzuseeds.github.io/tropical-cover-crop-calculator/

Background reading

Companion field notes and methodology essays from the maintainers at Chemiseed Field Notes on Substack:

What Mucuna bracteata actually does in an immature oil palm field: six-week seedlings, 320 per hectare, 67 to 84 percent Ndfa, the boring real numbers MPOB will actually defend.
Further issues on Calopogonium establishment, Pueraria biomass, and SoilBoost EA application protocols are released periodically.

Source bibliography

Maintainer contact

Chemiseed Sdn. Bhd., Kuala Lumpur, Malaysia. shaharil@chemiseed.com - https://chemiseed.com

license: cc-by-4.0 language: - en tags: - agriculture - tropical-agriculture - cover-crops - malaysia - oil-palm - rubber - soil-health - nitrogen-fixation - agronomy - southeast-asia pretty_name: Tropical Cover Crop Performance Meta-Dataset size_categories: - n<1K source_datasets: - original task_categories: - table-question-answering - text-classification dataset_info: features: - name: study_id dtype: string - name: species dtype: string - name: crop_system dtype: string - name: region dtype: string - name: year_range dtype: string - name: seeding_rate_kg_ha dtype: string - name: establishment_days dtype: string - name: n_fixation_kg_ha_yr dtype: string - name: source_citation dtype: string

Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems (2000-2025)

At a glance

Records: 50
Time range: 2000-2025
Geographic coverage: Peninsular Malaysia, Sabah / Sarawak, Kalimantan, Sumatra, Mindanao, Luzon, Thailand, Vietnam
License: CC-BY 4.0 (open, attribution required)
Maintainer: Chemiseed Sdn. Bhd., Malaysia
Canonical citation DOI: 10.5281/zenodo.20244236

Species covered

Mucuna bracteata (MB) — the workhorse legume for oil palm immature cover
Calopogonium mucunoides — fast-establishing pioneer
Calopogonium caeruleum — shade-tolerant alternative for older plantings
Centrosema pubescens — drought-resistant grazing-compatible legume
Pueraria javanica (synonym Pueraria phaseoloides) — high-biomass nitrogen fixer
SoilBoost EA application studies — humic acid soil conditioner from Chemiseed Sdn. Bhd.

Files

tropical-cover-crop-performance-dataset.csv — the meta-dataset, 50 rows × 9 columns
Methodology-and-Data-Description.pdf — full methodology, inclusion criteria, source bibliography

Citation

@dataset{abdul_2026_chemiseed_tropical_cover_crops,
  author    = {Abdul, Shaharil and {Chemiseed Sdn. Bhd.}},
  title     = {Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems: A Compiled Meta-Dataset (2000-2025)},
  year      = {2026},
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.20244236},
  url       = {https://doi.org/10.5281/zenodo.20244236},
  version   = {1.0}
}

Companion code

The open-source calculator toolkit that uses this dataset for seed-rate and climate-suitability scoring: github.com/chemiseedkudzuseeds/tropical-cover-crop-calculator

Live demo (in-browser, no setup): https://chemiseedkudzuseeds.github.io/tropical-cover-crop-calculator/

Background reading

Field notes and methodology essays on tropical cover cropping: Chemiseed Field Notes on Substack.

Source bibliography

Maintainer contact

Chemiseed Sdn. Bhd., Kuala Lumpur, Malaysia. shaharil@chemiseed.com · https://chemiseed.com

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Datasets:

chemiseed
/

tropical-cover-crop-performance-malaysia

Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems (2000-2025)

At a glance

Species covered

Files

Citation

Companion code

Background reading and field notes

Source bibliography

Related links

Maintainer contact

Chemiseed Sdn. Bhd., Kuala Lumpur, Malaysia. shaharil@chemiseed.com - https://chemiseed.com

Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems (2000-2025)

At a glance

Species covered

Files

Citation

Companion code

Background reading

Source bibliography

Related links

Maintainer contact

Chemiseed Sdn. Bhd., Kuala Lumpur, Malaysia. shaharil@chemiseed.com - https://chemiseed.com

Tropical Cover Crop Performance in Malaysian Oil Palm and Rubber Systems (2000-2025)

At a glance

Species covered

Files

Citation

Companion code

Background reading

Source bibliography

Maintainer contact