EFFECT OF HUMIC ACID, SEAWEED EXTRACTS AND ORGANIC FERTILIZER ON YIELD QUALITY OF BROCCOLI (Brassica oleracea) GROWN UNDER PLASTIC HOUSE
DOI:
https://doi.org/10.25271/sjuoz.2025.13.2.1339Keywords:
Broccoli, Bio-Stimulants, Organic Manure, Yield QualityAbstract
The research was carried out at the protected cultivation department in Zakho Technical Institute, Dohuk Polytechnic University, Kurdistan region of Iraq during growing season 2021-2022 aiming to investigate the effect of foliar application of humic acid and seaweed extract each at concentrations (0, 2, and 4) ml.L-1 and soil addition of organic fertilizer (animal manure) at three rates (0, 5, and 10) ton.ha-1 on yield quality of broccoli cultivar (Agassirz) grown in plastic house. The experiment was designed following a randomized complete block design (RCBD) with three replicates. The earned results showed that the humic acid, seaweed extract, and organic manure, either individually or interacted, caused a prominent amelioration in the head qualitative traits such as Chlorophyll content (SPAD), Total soluble solids (TSS %), Ascorbic acid (%), Vitamin B1 (µg. L-1), and Total carotene (vitamin A) mg. L-1 as compared with control. The ever-highest values were obtainable from the treatment: humic acid at (4) ml. L-1 + seaweed extract at (4) ml. L-1 + organic fertilizer at (10) tons. donum-1, which was superior to control and other treatments. The foliar application of humic acid and seaweed extract at a concentration of 4 ml. L-1 and soil addition of organic manure at level 10 tons. donum-1 is recommended for the organic production of broccoli cultivar (Agassirz).
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