Measurement of Growth Parameters of Different Fruit Crops 

1. Aim

To measure and record the important vegetative growth parameters of fruit crops and understand their role in evaluating plant growth and productivity.

2. Principle

Growth parameters represent the quantitative measurements of plant development, including plant height, stem girth, canopy spread, leaf area, and shoot growth. These parameters indicate the vigour, physiological status, and productivity potential of fruit crops.

Measurement of growth parameters is essential for:

Evaluating plant growth performance

Assessing the effect of nutrient management, pruning, and growth regulators

Studying canopy architecture and tree vigor

Accurate measurement of these parameters helps researchers and orchard managers monitor plant health and optimize orchard management practices.

3. Materials Required

Measuring tape, Vernier caliper, Meter scale, Leaf area meter (or graph paper method , Field notebook, Tags and labels

4. Procedure

i. Plant Height

Measure the height of the plant from ground level to the topmost shoot using a measuring tape or meter scale.

ii. Stem Girth / Trunk Diameter

Measure the trunk circumference at 30 cm above ground level using measuring tape.

Diameter can be calculated as: Diameter=Circumference/π

iii. Canopy Spread

Measure canopy spread in two directions:

North–South (NS) direction

East–West (EW) direction

Average canopy spread= (EW+NS)/2

iv. Shoot Length

Select a representative shoot and measure its length from base to tip using a measuring scale.

v. Number of Leaves per Shoot

Count the total number of leaves on the selected shoot.

vi. Leaf Area Index (LAI) is defined as the ratio of total leaf area of a plant canopy to the ground area occupied by the plant. It is an important indicator of canopy density, photosynthetic capacity, and crop productivity.

LAI= Total Leaf Area/ Ground Area Covered by the Plant

LAI helps in evaluating:

Light interception efficiency

Photosynthetic activity

Crop growth and yield potential

Canopy management practices

In fruit crops, an optimum LAI ensures maximum light utilization without excessive shading inside the canopy.

6. Result

The measured growth parameters provide information on vegetative vigour and canopy development in fruit crops, which are essential indicators of orchard performance and crop productivity.

7. Precautions

Use uniform measuring methods for all plants.

Take measurements from representative and healthy plants.

Avoid measurement during strong wind or rain.