Adalia Consultancy
In cherries, water directly shapes fruit size, quality and next year's crop. Well-planned drip irrigation and fertigation deliver water and nutrients exactly where and when the tree needs them.
Cherry water needs change through the season
A cherry tree's water demand is not constant. It changes with leaf area, temperature, wind and the tree's growth stage. A good irrigation plan follows what the tree needs now, not a fixed calendar.
- Bud break and bloom: Leaf area is small and water use is low. If winter rainfall was adequate, soil moisture often covers this period. After a dry winter, check the soil anyway.
- Fruit set and cell division (stage I): The number of cells in the fruit is set now. Water stress limits the final size the fruit can reach.
- Pit hardening (stage II): Fruit growth slows. Shoot growth continues.
- Final swell (stage III): Fruit grows fast and gains most of its weight before harvest.
- Post-harvest: The tree forms next year's flower buds and builds up reserves.
Critical periods: stage III and post-harvest
The final stage of fruit growth
The last weeks before harvest are the most sensitive for fruit size. A water shortage in this window cannot be made up later. Fruit stays small and loses market value.
Post-harvest bud differentiation
Many growers cut back or stop irrigation after harvest. In cherries, this is one of the most expensive mistakes. Next year's flower buds differentiate during exactly these summer months. A water-stressed tree forms weak buds. In some varieties, it can also increase the number of double fruits the following year. Post-harvest irrigation is an investment in next season.
Irregular irrigation and fruit cracking
Cherry cracking is largely linked to water uptake through the fruit skin. Rain near harvest is the biggest risk. Irrigation mistakes, however, make cracking worse. Soaking a dry soil all at once lets the fruit take up water quickly and puts the skin under strain.
The answer is to keep soil moisture steady, within a narrow range. This is the main strength of drip irrigation: short, frequent irrigations that avoid sudden swings in moisture.
When and how much to irrigate?
Soil moisture sensors and tensiometers
Irrigating without checking the soil is like driving blindfolded. Tensiometers and soil moisture sensors show how easily the tree can take up water in the root zone.
- Install sensors at a minimum of two depths, in the upper and lower root zone.
- In each uniform block, choose spots that represent a typical tree and dripper.
- The shallow sensor tells you when to start irrigating. The deep sensor tells you whether water is draining below the roots.
Evapotranspiration (ET) based scheduling
The second tool is weather data. Take reference evapotranspiration (ET0) from a nearby weather station and multiply it by a crop coefficient (Kc) suited to the cherry growth stage. This gives an estimate of the orchard's daily water use. The most reliable approach is to check the ET estimate against your sensor readings.
Fertigation basics
Fertigation means applying fertiliser through the irrigation water. Nutrients reach the active root zone directly, and you can split doses across the season. A few basic rules apply:
- Timing: Nitrogen demand rises in spring with shoot and leaf growth. Potassium becomes important during fruit development. Post-harvest nutrition supports reserves and buds.
- Compatibility: Do not mix calcium fertilisers with phosphate or sulphate fertilisers in the same tank. They precipitate and block the system. Use separate A and B tanks when needed.
- Sequence: Start each irrigation with clean water, inject fertiliser in the middle, then flush the lines with clean water at the end.
- Small, frequent doses: Spreading small doses across the season reduces leaching losses and salt build-up compared with one large application.
Water quality: EC and pH
Have your irrigation water analysed at the start of every season. EC shows the salt load of the water. Cherry is a salt-sensitive crop. pH and bicarbonate levels affect both nutrient uptake and lime scale in drippers. Sodium, chloride and boron also need checking. During fertigation, measure the EC and pH of the solution at the dripper outlet regularly.
Filtration and clogging
Clogging is the most common problem in drip systems. Sand, lime, iron deposits and algae slowly block drippers. Match the filter to your water source: sand media filters are common for surface water, disc or screen filters for well water. Clean filters regularly and flush lateral ends at set intervals. Where lime scale is a problem, acid cleaning under expert supervision may be needed.
A sample weekly routine
This is a template, not a prescription. Amounts and frequency must be set for your orchard.
- Start of the week: Record sensor and tensiometer readings. Compare them with last week's ET values.
- Plan: Update irrigation run times and frequency based on the weekly forecast. Adjust if rain is expected.
- Fertigation days: Spread the fertiliser programme across the week. Measure solution EC and pH.
- Checks: Check filter pressure difference, dripper flow and leaks in the lines.
- End of the week: Look at the trees, fruit development and the soil surface. Carry your notes into next week's plan.
An irrigation and fertigation plan for your orchard
The right water amounts and fertiliser doses depend on soil type, climate, variety, rootstock and analysis results. Copying another orchard's programme rarely works. At Adalia Danışmanlık, we review your irrigation system, water quality and soil data together and prepare an irrigation and fertigation plan you can track through the season.