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Timing for Taking PlantSap Analyses

Here are the optimal times for plant sap analyses, considering 5 analyses per season, the growth phases, and the months in the Netherlands.

Important: These schedules are based on general growth patterns in the Netherlands. The exact timing can vary depending on the specific year, the variety, and local conditions.

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General Principles

  • ​Analysis 1: Early in the growing season, to determine the basic nutritional status of the plant.
     

  • Analysis 2: Around flowering or the start of fruit setting, a critical phase for development.
     

  • Analysis 3: During the period of greatest growth or fruit development, to monitor nutrient needs.
     

  • Analysis 4: Towards the end of the growing period, to prepare the plant for ripening or dormancy.
     

  • Analysis 5: After harvest (if applicable), to assess the nutrient status of the plant and plan fertilization for the next season.

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Important Reminders

  • Flexibility: These schedules are guidelines. Be flexible and adapt them based on the specific conditions in the cultivation.
     

  • Observation: Observe your plants carefully. Visual signals of nutrient deficiencies or excesses can help determine the optimal timing for the analyses.
     

  • Communication: Consult with your plant sap analysis laboratory. They can provide you with specific recommendations based on your crop, soil, and cultivation conditions.

​

Also, don't forget to contact your advisor!

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Potato

  • Analysis 1: Late April/early May (after emergence, vegetative growth)
     

  • Analysis 2: Late May/early June (before flowering/tuber setting)
     

  • Analysis 3: Late June/early July (during tuber growth)
     

  • Analysis 4: Late July/early August (end of tuber growth/ripening)
     

  • Analysis 5: After harvest (September/October)

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Strawberry

  • Analysis 1: Late March/early April (start of vegetative growth)
     

  • Analysis 2: Late April/early May (before flowering)
     

  • Analysis 3: Late May/early June (during fruit setting)
     

  • Analysis 4: Late June/early July (during fruit ripening)
     

  • Analysis 5: After harvest (July/August)

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Asparagus

  • Analysis 1: Late April/early May (start of shoot growth)
     

  • Analysis 2: Late May/early June (during shoot growth)
     

  • Analysis 3: Late June/early July (end of shoot growth)
     

  • Analysis 4: Late July/early August (after harvest, plant preparation)
     

  • Analysis 5: Not applicable (possibly in the fall, october/november, before the dormancy period)

Beets

  • Analysis 1: Late April/early May (after emergence, vegetative growth)
     

  • Analysis 2: Late May/early June (start of root formation)
     

  • Analysis 3: Late June/early July (during root growth)
     

  • Analysis 4: Late July/early August (just before harvest)
     

  • Analysis 5: After harvest (September/October)

closeup-huckleberries-tree-branches-surrounded-by-greenery-sunlight.jpg

Blueberry

  • Analysis 1: Late March/early April (start of vegetative growth)
     

  • Analysis 2: Late April/early May (before flowering)
     

  • Analysis 3: Late May/early June (during fruit setting)
     

  • Analysis 4: Late June/early July (during fruit ripening)
     

  • Analysis 5: After harvest (July/August)

Bean

  • Analysis 1: Late May/early June (after emergence, vegetative growth)
     

  • Analysis 2: Late June/early July (before flowering)
     

  • Analysis 3: Late July/early August (during pod formation)
     

  • Analysis 4: Late August/early September (during pod growth)
     

  • Analysis 5: After harvest (September/October)

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Chrysanthemum

  • Analysis 1: Early in cultivation (after potting/planting)
     

  • Analysis 2: During vegetative growth
     

  • Analysis 3: Before flowering
     

  • Analysis 4: During flowering
     

  • Analysis 5: Not applicable (cultivation is often short)

greeb-grapes-vineyard.jpg

Grape

  • Analysis 1: Late April/early May (start of vegetative growth)
     

  • Analysis 2: Late May/early June (before flowering)
     

  • Analysis 3: Late June/early July (during fruit setting)
     

  • Analysis 4: Late July/early August (during fruit ripening)
     

  • Analysis 5: After harvest (September/October)

selective-focus-shot-two-raspberries-bush.jpg

Raspberry

  • Analysis 1: Late March/early April (start of vegetative growth)
     

  • Analysis 2: Late April/early May (before flowering)
     

  • Analysis 3: Late May/early June (during fruit setting)
     

  • Analysis 4: Late June/early July (during fruit ripening)
     

  • Analysis 5: After harvest (July/August)

beautiful-high-angle-shot-pink-marguerite-daisies-garden-sunlight.jpg

Gerbera

  • Analysis 1: Early in cultivation (after potting/planting)
     

  • Analysis 2: During vegetative growth
     

  • Analysis 3: Before flowering
     

  • Analysis 4: During flowering
     

  • Analysis 5: Not applicable (cultivation is often continuous)

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Grass and Grass-clover

  • Analysis 1: March/April (start of growing season)
     

  • Analysis 2: Before the first cut (May/June)
     

  • Analysis 3: Before the second cut (July/August)
     

  • Analysis 4: Before the third cut (September/October)
     

  • Analysis 5: Not applicable (possibly in the fall, October/November, before the dormant period)

Hard fruit (Apple, Pear)

  • Analysis 1: Late March/early April (start of vegetative growth)
     

  • Analysis 2: Late April/early May (before flowering)
     

  • Analysis 3: Late May/early June (during fruit setting)
     

  • Analysis 4: Late July/early August (during fruit growth)
     

  • Analysis 5: After harvest (September/October)

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Kalanchoe

  • Analysis 1: Early in cultivation (after potting/planting)
     

  • Analysis 2: During vegetative growth
     

  • Analysis 3: Before flowering
     

  • Analysis 4: During flowering
     

  • Analysis 5: Not applicable (cultivation is often continuous)

cherry-tree-with-ripe-cherries.jpg

Cherry

  • Analysis 1: Late March/early April (start of vegetative growth)
     

  • Analysis 2: Late April/early May (before flowering)
     

  • Analysis 3: Late May/early June (during fruit setting)
     

  • Analysis 4: Late June/early July (during fruit ripening)
     

  • Analysis 5: After harvest (July/August)

Cucumber

  • Analysis 1: Early in cultivation (after planting)
     

  • Analysis 2: At the start of flowering
     

  • Analysis 3: During the first fruit setting
     

  • Analysis 4: During the main harvest
     

  • Analysis 5: Not applicable (cultivation is often continuous)

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Kohlrabi

  • Analysis 1: Late April/early May (after emergence, vegetative growth)
     

  • Analysis 2: Late May/early June (start of tuber formation)
     

  • Analysis 3: Late June/early July (during tuber growth)
     

  • Analysis 4: Late July/early August (just before harvest)
     

  • Analysis 5: After harvest (August/September)

beautiful-pink-lily-garden.jpg

Lily

  • Analysis 1: Early in cultivation (after planting)
     

  • Analysis 2: During vegetative growth
     

  • Analysis 3: Before flowering
     

  • Analysis 4: During flowering
     

  • Analysis 5: Not applicable (cultivation is often short)

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Corn 

  • Analysis 1: Late April/early May (after emergence, vegetative growth)
     

  • Analysis 2: Late May/early June (during rapid growth)
     

  • Analysis 3: Late June/early July (before flowering/grain setting)
     

  • Analysis 4: Late July/early August (during grain filling)
     

  • Analysis 5: After harvest (September/October)

close-up-unripe-garden-tomato.jpg

Bell pepper 

  • Analysis 1: Early in cultivation (after planting)
     

  • Analysis 2: At the start of flowering
     

  • Analysis 3: During the first fruit setting
     

  • Analysis 4: During the main harvest
     

  • Analysis 5: Not applicable (cultivation is often continuous)

harvest-carrots.jpg

Carrot 

  • Analysis 1: Late April/early May (after emergence, vegetative growth)
     

  • Analysis 2: Late May/early June (start of root formation)
     

  • Analysis 3: Late June/early July (during root growth)
     

  • Analysis 4: Late July/early August (just before harvest)
     

  • Analysis 5: After harvest (September/October)

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Orchids

  • Analysis 1: Beginning of the growth period
     

  • Analysis 2: Before flowering
     

  • Analysis 3: During flowering
     

  • Analysis 4: After flowering
     

  • Analysis 5: Not applicable (continuous cultivation)

neat-row-spring-onions-bundled-with-red-elastic-ready-sale-market-spring-onion-ripe-spring

Leek 

  • Analysis 1: Late April/early May (after planting)
     

  • Analysis 2: Late May/early June (during vegetative growth)
     

  • Analysis 3: Late June/early July (during stem formation)
     

  • Analysis 4: Late July/early August (just before harvest)
     

  • Analysis 5: After harvest (September/October)

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Redcurrant 

  • Analysis 1: Late April/early May (start of vegetative growth)
     

  • Analysis 2: Late May/early June (before flowering)
     

  • Analysis 3: Late June/early July (during fruit setting)
     

  • Analysis 4: Late July/early August (during fruit ripening)
     

  • Analysis 5: After harvest (August/September)

top-view-delicious-lettuce-leaves.jpg

Lettuce 

  • Analysis 1: Early in cultivation (after planting)
     

  • Analysis 2: During vegetative growth
     

  • Analysis 3: At the start of head formation
     

  • Analysis 4: Just before harvest
     

  • Analysis 5: Not applicable (cultivation is often short)

close-up-photo-fresh-ripe-tomatoes-peppers.jpg

Tomato 

  • Analysis 1: Early in cultivation (after planting)
     

  • Analysis 2: At the start of flowering
     

  • Analysis 3: During the first fruit setting
     

  • Analysis 4: During the main harvest
     

  • Analysis 5: Not applicable (cultivation is often continuous)

beautiful-scenery-tulips-field-sunset-sky.jpg

Tulip

  • Analysis 1: After planting (autumn)
     

  • Analysis 2: At the beginning of growth (early spring)
     

  • Analysis 3: Before flowering
     

  • Analysis 4: During flowering
     

  • Analysis 5: After flowering

top-view-onion-arrangement.jpg

Onion 

  • Analysis 1: Late April/early May (after emergence, vegetative growth)
     

  • Analysis 2: Late May/early June (start of bulb formation)
     

  • Analysis 3: Late June/early July (during bulb growth)
     

  • Analysis 4: Late July/early August (just before harvest)
     

  • Analysis 5: After harvest (August/September)

The Project Partners

This project is carried out by a unique consortium of project partners, consisting of SoilBeat, agronomists specializing in regenerative agriculture and the scientific institutions. 

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