ISM Biofertil N 2024 Broccoli Trial Yield
Objective:
To determine the impact of a 20% nitrogen reduction on broccoli yield and whether current or experimental ISM Biofertil N products can be used to maintain or improve yield.
Materials and Methods:
- On July 5, 2024, the plot was established in a sandy loam soil near Santa Maria, California.
Broccoli was planted in plots 99 cm wide and 160 m long, with row spacing of 30 cm. The planting rate was approximately 26,136 plants per acre. Each plot was replicated four times in a completely randomized block design. - A preplant treatment of ISM Biofertil N (2-0-0) 3.5 Gal/Ac was incorporated along with a drip application of ISM Biofertil N (2-0-0) 4 Gal/Ac before planting. For all treatments, ISM Biofertil N (2-0-0) 3.5 Gal/Ac was applied initially during thinning, followed by applications of ISM Biofertil N (2-0-0) 5 Gal/Ac every two weeks. Crop growth and yield characteristics were measured. Plant counts did not differ significantly between treatments, and crop vigor was very good in all treatments. See Table B1 for more information.
- Remote sensing equipment was used to objectively measure leaf greenness (NDRE) and canopy cover (NDVI). Each measurement increased as the season progressed, indicating healthy growth. The Canopy Chlorophyll Content Index (CCCI), a measure of canopy greenness, was also determined during this trial.
- Broccoli heads were harvested on two different dates (9/29/24 and 10/7/124) and sorted by size on each date. The heads were classified as large, medium, or small.
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