California Citrus Newsletter

January 2022


Start your Citrus off Right this 2022 Season - Focusing on Calcium and Phosphorus

Another year has passed, and we are well into the citrus harvest. Before too long we will see trees blooming once again and the farming season will be in full swing. Changes in fertilizer and crop prices, as well as water restrictions, have many farmers searching for new ways to maintain profitability.

Having a strong, balanced nutrition program is important when growing any agricultural crop. Providing all essential nutrients when the crop demands them is critical in order to achieve high yields, quality, and profitability. A balanced nutrition program will also ensure that you maintain overall tree and soil health.

Calcium and phosphorus are two essential nutrients that you might consider applying in early spring. Calcium is a critical component of cell walls and has a direct influence on the regulation of enzyme systems and nutrient uptake. Calcium also influences pollen tube elongation and seed formation. Phosphorus supports better root growth and is a key component in energy production and transfer in cells. Phosphorus captures, stores, transports, and releases energy for metabolic processes. Both calcium and phosphorus increase cell division, improve root growth, and play major roles in photosynthesis.

P deficiency - citrus old leaf.png Phosphorus deficiency - old citrus leaf

P def young leaf.png Phosphorus deficiency - young citrus leaf

Stunted, poor growth is a common sign of a phosphorus deficiency. Visible symptoms also include purplish and bronze discoloration on leaves. Leaves will shed prematurely, and fruit drop can be heavier in these conditions. Phosphorus deficiencies can impede flower development thus reducing fruit set and yield. A deficiency in calcium is exhibited as marginal and sometimes interveinal chlorosis as well as poor, uneven terminal growth. Calcium deficiency also leads to reduced yield and poor-quality fruit. Citrus trees with severe deficiencies will have weak cell structures, lack vigor, and can develop twig dieback.

Phosphorus and calcium uptake occurs throughout the growth period, after flowering and through late fruit maturity. Sufficient availability is critical during periods of active root growth such as early spring and in between vegetative flushes. We have to remember that plants require a balanced approach to providing ALL essential nutrients, not just phosphorus and calcium. Refer to your most recent analytical reports and a Yara Agronomist to help you put together a more targeted and efficient citrus crop program.

crop stages - critical timing early veg.png


Yara's Solutions for Citrus Nutrition

Leffingwell® Nutra-Phos® CalZinc 0-24-0 and Leffingwell® Nutra-Spray® ZM are fully formulated foliar-applied products providing great solutions for early vegetative and spring flush nutrition.

  • High analysis, pH neutral, wettable powder that provides the essential nutrients over several days giving a cost-effective treatment.
  • Extremely fine particle size gives thorough coverage, efficient nutrient uptake, and enhanced sprayability.

Leffingwell Nutra-Phos CalZinc - 24% P, 20% Ca, 6% S, 12% Zn
Leffingwell Nutra-Spray ZM - 10% Ca, 7% Mn, 18.5% Zn

YaraLiva® CN-9® and YaraLiva® TROPICOTE® provide immediately available nitrate-nitrogen and water-soluble calcium.

  • Nitrate nitrogen increases plant growth by enhancing the uptake of other essential nutrients such as calcium, magnesium, and potassium
  • Water-soluble calcium promotes proper cell division for larger fruit and less chance of disorders such as creasing
  • Readily available calcium promotes root growth for efficient water and nutrient uptake


Contact your local Yara representative to find a distributor of these products near you.

Vanessa Vicencio

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



Subscribe to Yara's California Citrus Newsletter & More

Fill out this form to receive Yara's California Citrus Newsletters and other citrus crop nutrition email communications from Yara in your inbox. *Required field.

By providing information to one or more of the Yara Companies on this form, you acknowledge, agree, and understand that:

  • Your consent is not required as a condition of purchasing any goods or services from any Yara Company;

  • the information that you provide to any of the Yara Companies on this form: (i) will be stored and kept by one or more of the Yara Companies; (ii) will be used to contact you in order to keep you informed about products, services, promotions, offers, events, and other matters that one or more of the Yara Companies believe may interest you; and (iii) may be shared by such Yara Companies, now or in the future;

  • one or more of the Yara Companies may send commercial electronic messages (including email to the email address you provide and text messages to the phone number you provide), and you expressly consent to the sending of such commercial electronic messages (and acknowledge that message and data rates may apply); and

  • you can email the Yara Companies at or send a letter to Yara North America, Inc., 100 North Tampa Street, Suite 3200, Tampa, Florida, 33602, Attention: Marketing Department, if you would like to (i) know what information the Yara Companies have stored about you; (ii) correct any information the Yara Companies have about you; (iii) cancel any subscriptions to mailing lists or distribution lists of any of the Yara Companies; (iv) stop the Yara Companies from sending text messages to the phone number you provide; (v) stop the Yara Companies from sending email to the email address you provide; (vi) stop the Yara Companies from sending mail to the address you provide; (vii) request the removal of your information from the systems of any of the Yara Companies; or (viii) ask any other questions regarding the collection or use of your information by any of the Yara Companies.

By submitting this form you confirm that you have been informed that we store, collect, process, and manage your data in accordance with our Privacy Policy, and that you agree to the terms and conditions of our Privacy Policy, that you should review in full. The consent is written in the English language, and to the extent any translated versions conflict with the English language version, the English language version shall control.