// APPENDIX — BIBLIOGRAPHY

Citations & sources

Every cultivation parameter on Rootless is grounded in a primary source. This is the bibliography. Individual plant pages reference these by short code; full DOI / URL is listed here.

Primary sources

10 entries

UCD-LET-01: Greenhouse Lettuce Production Guide
University of California, Davis — Plant Sciences
pH/EC ranges, photoperiod, and tipburn thresholds for lettuce.
https://anrcatalog.ucanr.edu →
CORN-CEA-01: Controlled Environment Agriculture Group — Tomato & Lettuce Protocols
Cornell University — CEA
DLI targets, nutrient solution recipes, fruiting-crop EC stepping.
https://cea.cals.cornell.edu →
RHS-HYDRO-01: RHS Plant Cultivation Database
Royal Horticultural Society
Botanical names, growth habit, hardiness — cross-reference for plant pages.
https://www.rhs.org.uk →
USDA-NUT-01: USDA Plants Database
USDA — Natural Resources Conservation Service
Canonical scientific names and growth-habit data.
https://plants.usda.gov →
OSU-NUT-01: Hydroponic Nutrient Solutions — Formulations & Stock Solutions
Ohio State University Extension
Macro/micronutrient mg/L targets used in nutrient calculator.
https://extension.osu.edu →
KRATKY-ORIG: A Suspended Net-Pot, Non-Circulating Hydroponic Method
B.A. Kratky, University of Hawaii (2009)
Original peer-reviewed description of the Kratky method.
https://www.ctahr.hawaii.edu/oc/freepubs/pdf/v-no-3.pdf →
DO-TEMP-01: Dissolved Oxygen vs Water Temperature — USGS Solubility Table
U.S. Geological Survey
DO ceiling at reservoir temperatures (drives our >24 °C warning for Kratky).
https://water.usgs.gov →
PPF-DLI-01: Daily Light Integral (DLI) for Greenhouse Crops
Purdue University Extension
DLI targets per crop class used across plant ledger.
https://www.extension.purdue.edu →
WHO-COMP-01: Nutrient Composition of Hydroponic vs Soil-Grown Vegetables
Peer-reviewed meta-analyses (various, see linked DOIs on each plant page)
Nutrient density comparisons cited in plant pages and the hydroponics-vs-soil guide.
GROWER-LOGS: Rootless internal grow logs
Rootless Farm workshop
EC/pH/yield logs from in-house grows. Raw CSV is linked from each individual experiment post; posts that lack raw data are not published (see /legal/editorial-standards).

Editorial standard

We prefer university extension publications and peer-reviewed studies over secondary aggregators. When a numerical range is contested across sources, we publish the conservative envelope and note the disagreement on the relevant page. Internal grow logs are clearly marked and dated; raw data is published alongside any claim we derive from them.