California Citrus Newsletter

September 2024

Closing the Season Strong with one Final Potassium Application

Most citrus growers in the Central Valley of California usually like to have all of their fertilizer applied by the end of September through early October depending on variety. Late summer through early fall is a great time to have some tissue samples pulled to see what the leaf nutrient levels look like. If any severe deficiencies are found, there is an opportunity to make a last application to remediate before harvest and make changes in your next year’s programs. The tissue results can also be used to decide which nutrients and what amounts will be applied the following season. Plant tissue samples should be taken at least once a year to ensure that your crop nutrition programs are tailored to your crop’s needs. Compare this data year over year to chart progress and see the effects of corrective measures taken, and compare to yield and quality.

As we get closer to harvest and are thinking about making one last fertilizer application, potassium plays a major role in finishing a citrus crop. It has a positive effect on the rind thickness, fruit color, brix, and juice content of citrus. The demand for potassium starts climbing once the fruit begins to size and throughout the summer months (maturity). Potassium deficiency will negatively influence yield, fruit size, and quality, so it is a nutrient that should not be taken lightly especially if there is a deficiency, insufficiency, or nutrient imbalance.

It is always a good 4Rs practice to apply potassium fertilizers based on soil and tissue analysis and crop load. Typical application practices are dry soil potassium applied annually and/or applied as a fertigation throughout the growing season when the trees require it. Frequent, smaller spoon-feed applications of potassium are more efficient than applying higher rates, especially in sandy soils.

YaraTera NITRAKAL MAX₁

YaraTera NITRAKAL MAX₁ (9-0-7 3.5% Ca) features an immediately available, balanced blend of nitrogen, potassium, and calcium.

YaraTera KMAX

YaraTera KMAX is a low salt index, fully soluble potassium to all citrus, nuts, fruits, and vegetables, preventing deficiencies, ensuring sufficiency, and encouraging growth of high-quality, healthy crops. With 28% K₂0, it provides a high concentration of potassium delivered in a carbon-based material to support better nutrient uptake. YaraTera KMAX is safe, effective, and efficient for all crops, giving growers peace-of-mind in their potassium fertilizer choice.

Contact your Yara representative to discuss crop nutrition options.

Vanessa Vicencio

Sales Agronomist at Yara North America - South Central Valley, California

vanessa.vicencio@yara.com

Vanessa Vicencio

Sales Agronomist

South Central Valley, California

(559) 909-5175

Send email

Previous Issues

Potassium: Ensuring Higher Fruit Numbers and Higher Yields with YaraTera KMAX

Start your 2024 Season Off Right and Defend your Citrus against Puff and Crease

Citrus Harvest - Time to Talk About Crop Nutrition

Three nutrients to consider during the fruit enlargement growth stage: nitrogen, potassium, and calcium – the perfect trio!

Not all nitrogen forms are the same - and your N choice has a great impact on your citrus trees' potential

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