Climate change is creating new challenges for citrus growers, and one of the biggest impacts is on tree nutrition. According to a recent article in Frontiers in Plant Science authored by an international team of researchers, rising temperatures, changing rainfall patterns, drought, flooding, salinity and elevated carbon dioxide levels are all affecting how citrus trees take up and use nutrients.
Citrus trees are especially vulnerable because they have relatively shallow root systems, and fruit takes a long time to develop. When weather conditions become more extreme, nutrient uptake can suffer even if fertilizer programs remain unchanged.
ADVERSE WEATHER
Drought is one of the biggest concerns. Dry soils reduce the movement of nutrients such as nitrogen, potassium, calcium and magnesium to the roots. Trees under drought stress also reduce photosynthesis, limiting their ability to use nutrients efficiently.
On the other hand, excessive rainfall can leach nutrients out of the root zone, particularly in sandy soils common to many citrus-growing regions.
Heat stress creates additional problems. Soil temperatures above 95 degrees Fahrenheit can reduce root growth and damage the tree’s ability to absorb nutrients. High temperatures also increase the risk of fruit quality issues, including lower juice content, reduced sugars and poor flavor development.
ADJUST FERTILIZER PROGRAMS
The article notes that climate change may increase deficiencies of key nutrients, particularly nitrogen, phosphorus, magnesium, iron and zinc. At the same time, nutrients such as potassium, calcium and magnesium become even more important because they help trees tolerate heat, drought and salinity stress.
Researchers emphasize that traditional fertilizer programs may need to be adjusted. Instead of relying on fixed schedules, growers should use regular soil and leaf testing to guide nutrient decisions. Precision fertigation, split fertilizer applications and the use of slow-release fertilizers can improve nutrient-use efficiency while reducing losses.
SOIL HEALTH
Maintaining healthy soils is also becoming increasingly important. Practices such as adding organic matter, using composts, cover crops, biochar and beneficial soil microbes can improve nutrient availability and water-holding capacity.
ROOTSTOCK SELECTION
Selecting rootstocks that perform well under drought, salinity or other stress conditions may also help sustain productivity.
TAKEAWAY MESSAGE
The authors conclude that successful citrus production under future climatic conditions will require a more integrated approach that combines irrigation management, nutrition monitoring, soil health practices and careful rootstock selection. Growers who adapt their nutrient programs to changing environmental conditions will be in the best position to maintain yields, fruit quality and long-term profitability.
FOR MORE
See the full article here, written by Anoop Kumar Srivastava of the Indian Council of Agricultural Research-Central Research Institute, Neriman Tuba Barlas of Ege University in Turkey, Qiang-Sheng Wu of Yangtze University in China, Eran Raveh of Agricultural Research Organization in Israel, Gustavo Brunetto of Federal University of
Santa Maria in Brazil, Tripti Vashisth of University of Florida, Seyed Majid Mousavi of Agricultural Research, Education and Extension Organization in Iran and Umesh Kumar Acharya of Nepal Agricultural Research Council.
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