Banana fertigation frequency and nutrient splitting by growth stage, weekly dosing.
7 Answers
Banana responds very well to frequent small fertigation doses rather than a few big ones, because its root zone is shallow and the crop feeds heavily over many months. A common approach is to fertigate weekly or even twice a week, giving most nitrogen and potassium in many small splits, with phosphorus front loaded in the early vegetative months and potassium pushed up sharply during bunch development. The total per plant dose should come from a banana fertigation schedule for your variety like Grand Naine, your soil test, and water quality. Keep calcium and phosphate sources in separate injections. Match dosing to growth stage: vegetative, flowering, and bunch filling each need different ratios. Get the exact plant wise schedule from your KVK or company agronomist and adjust to your Soil Health Card; do not over apply.
Weekly fertigation changed my banana completely versus the old basin method. Splitting potash into many doses gave me better bunch weight.
In our Jalgaon belt the big shift was pushing potassium hard during bunch development. I used to keep nutrition flat through the crop, but loading more potash at bunch stage gave fuller, heavier bunches and better grade. Front loading the phosphorus early also gave a stronger plant to start with.
One caution from experience: keep your calcium feed separate from the phosphate feed in the tank, otherwise you will clog the drippers and a shallow rooted crop like banana suffers fast when emitters block. I lost some plants to uneven watering before I sorted out my injection schedule. Get the schedule from the company agronomist for your soil.
Going from the old basin method to weekly fertigation lifted my Grand Naine bunch weight clearly. Many small potash splits through bunch development was the key. The plant feeds steadily instead of in big jumps.
Get the plant wise schedule from the company agronomist for your soil, do not just copy a neighbour. My water quality was different and the borrowed schedule clogged my drippers. Once the agronomist set the doses and kept calcium separate, it ran clean.
Do not overdo the nitrogen on banana chasing big leaves, it makes the plant soft and prone to lodging in wind and disease creeps in. I cut the nitrogen back to the schedule and pushed potash at bunch stage instead, and the bunches filled better.