How Healthy is Your Durians?

How can someone tells his/her durian is healthy? There are many ways to consider. It can be seen how 'green' is the leaves and performance of the plants. There is scientific way how to describe this. If your farm is big let say more than 10 acres, it is worth checking the healthiness.

The easiest method is using chlorophyll meter or SPAD meter. Measures leaf chlorophyll, an important indicator of plant health. The latter performs quick measurements of the chlorophyll content of leaves without damaging the leaf.

SPAD readings are recorded by inserting  the newest fully expanded leaf from each plant while avoiding old or immature leaves. Normally the fifth or sixth leaf counted from the shoot was taken where leaf mid-portion was recorded.

As a rule of thumb SPAD reading 50-60 means that the leaves are green and healthy while 30 and below the leaves are yellowish and not healthy.

Reports have shown that there is high correlation between chlorophyll content and SPAD readings.