A vegetable whose flower buds from the Brassicaceae family are eaten. It is a research subject in which glucosinolate content changes with fertilizer conditions.
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Composition and content (1)
broccoli — composition: A 2-year field trial in Norway (58 degrees N and 67 degrees N) comparing broccoli grown with organic/waste-derived fertilizers (algae meal, sheep manure, shrimp shell extrudate, anaerobically digested food waste) and a mineral fertilizer against 2 total nitrogen application levels (80 kg N/ha and 170 kg N/ha, with the mineral fertilizer only at 170 kg N/ha) and an unfertilized control. Yield varied strongly by fertilizer material (algae meal < unfertilized control < sheep manure < shrimp shell extrudate < anaerobically digested food waste < mineral fertilizer), and yield correlated linearly with estimated plant-available nitrogen in the field, but glucosinolate content did not correlate linearly. Shrimp shell extrudate and the mineral fertilizer (170 kg N/ha) had higher glucosinolate content than sheep manure and the unfertilized control.supported
Scope: Broccoli (Brassica oleracea var. italica), a 2-year field trial in Norway across 2 latitudes
Note: The abstract includes the description 『官能属性は肥料資材と圃場利用可能窒素量の影響を比較的受けにくかった』 (in translation: "sensory attributes were relatively little affected by fertilizer material and estimated field plant-available nitrogen"), but which sensory attributes were measured (whether bitterness was included, whether the panel was trained) cannot be determined from the abstract, and since the full text has not been confirmed, the connection to bitterness sensory perception has not been confirmed in this collection.
Yield correlated linearly with plant-available nitrogen application, but glucosinolate content did not correlate linearly. Sensory attributes were relatively little affected by fertilizer material and nitrogen level.
Limitations: Only the abstract was confirmed (the full text was inaccessible behind an ACS paywall). Whether bitterness is included among the sensory attributes cannot be determined from the abstract.