LEAF SAMPLING IN CASHEW

Leaf analysis is the quickest way to assess the nutrient supplying power of the soil. However, the usefulness of leaf analysis depends upon the correctness of leaf sampling. So utmost care should be exercised while collecting leaves for analysis.

Stage of leaf and time of sampling in cashew

In cashew 4th leaf with petiole from the tip of matured branches, just prior to flowering is to be sampled. About 10 leaves are required to be collected from different branches from all sides of the tree.

Precautions in leaf sampling

• Do not sample when the leaves are soiled or covered with dust
• Do not sample leaves damaged by insects disease
• Do not sample mechanically injured leaves and do not sample when plants are under moisture or temperature stress.

Dispatch for analysis

Enclose the collected leaves in paper bags and send immediately to soil and leaf analysis laboratory along with information such as the name of the farmer, location, the age of the tree, collection date, and the parameters to be tested etc. If the leaf to be sent later, it has to be dried at 60°C after washing with 0.2% detergent solution followed by 0.1 N HCl and double distilled water.