- Regular sampling in a plantation, structured into leaf sampling units (LSU), with a view to drawing up annual fertilizer schedules (generally conducted annually).
- Monitoring palm response to fertilization in field trials, based on a statistical trial design.
- Special sampling to deal with a particular problem (suspected mineral deficiency, etc...). In each case, a sampling design should be adopted for the choice of palms.
- identify, without mistakes, the frond to be sampled (rank 14 for coconut palm),
- Cut off a given number of leaflets (4 to 6) from the central section of the frond, divided equally either side of the rachis. Damaged leaflets should be discarded,
- do not allow leaflets to fall to the ground where they may be contaminated by soil or fertilizers, Place the leaflets together in envelopes or labelled boxes and carefully check the information marked on them. Important comments:
- The envelopes must be kept open at all times to allow leaf tissue transpiration to escape, and they should be large enough for the leaflets not to stick out, even when open.
- Avoid cutting the entire frond, though a few more leaflets than needed can be cut to facilitate identification of the frond when checking sampling rank.
- In the event of light rainfall, continue sampling to finish the current sampling operation, but stop if the rain becomes heavier. Between 11 am and midday, sampling should be completed and the samples transported for packaging.
Soil analysis and management