Sap Testing
Sap testing is a plant testing method whereby the internal stem sap of the plant is tested for nutrient levels. The stem sap is like the 'blood' of the plant, so when the sap is tested it reports the nutrients being readily transported throughout the plants system.
This test can be conducted at multiple growth stages throughout the growing season and works as a fantastic guide to aid you in following up in fertiliser treatment by means of foliar application for example.