Bent leaves – page 3 –

Yes … including cigar leaf that you see bent, which is the one that is showing the problem; And other recently opened (light colored or streaked) leaves which still needs additional calcium. … Other new cigar leaves, yet to push up the pstem & out, will push though the top of the pstem. Then pick up calcium collected at the top of the pstem (osmosis & electrolyte equalization of the sap). The U-shaped Peticle canal channels water or foliar spray into the top of the pstem and along the upper pstem which will absorb into the sap. … Foliar spray is a weak solution application and usually require application every 2 weeks (10 days ??) if this going to be the only source of fertilizer or nutrients.

Once the calcium binds in the plant cell, it is locked.

The calcium will not redistribute (recycle) within the plant to other parts that need it. The large green leaves that you referred to already have all the calcium they need. It’s the new upper leaves & cigar leaf that needs the calcium to thicken and strengthen the leaf before becoming damaged & broken by wind while waiting on root uptake.

Your reference doesn’t say that. … YOU said "That is wrong because calcium does not travel down the phloem to the meristem." … Your reference actually contradicts your statement as shown by your following quote. … I think you misunderstand what is meant by the terms "mobile and immobile" of calcium in plants. Calcium is mobile in some plants and immobile in others such as Banana. Calcium is mobile in ALL plants from the roots to the parts of the plant it is used. But in some plants such as Banana calcium becomes immobile when it binds (fixes) in the plant cellular structure. That is it can not be reused in other parts of the plant.

The plant roots readily absorb most mineral nutrients. However, many other plant organs are able to absorb nutrients in their ionic form from solutions. The extensive area of plant leaves makes them a natural candidate as a complementary feeding channel. Indeed, this method is now widespread in feeding management of many crops. The unique advantages that this method offers for banana growers are as follows:

In Martinique, Philippines, Colombia and elsewhere it has become a prevailing practice to apply Haifa Bonus npK at a rate of 70 -100 g/mat (25-30% of the yearly potassium requirement) at the time of bunch initiation. The high availability of Haifa Bonus npK to the plant makes it the best fertilizer in meeting the plant’s increasing demand for nutrients at this critical stage of plant development that determines yield.

Further, this is a Forum of Home/Hobby Grower of Bananas where we share our knowledge gain by ‘first hand’ experience. … BTW … Current fertilizer programs by & for Banana Plantation is to apply approximately 25% at planting by soil application for the first 3 or 4 months; then by soil side dressing, fertigation, or foliar spray apply 40% of needed fertilizer for a 70% total of the plant requirement by the time of shooting; THEN by FOLIAR spray apply the next 30% of the plant requirements directly to the upper plant & Bunch. This includes ALL the NPK, Macros (calcium), and Minors

Further, WE ARE NOT a Peer REVIEW group of any research papers and more especially a near 40 year old research paper you referenced. … That said paper was a study of calcium and only explained what happen to calcium inside the banana plant. That paper has nothing to do with Foliar spray applications as it was not part of that study. … You have NO foundation to claim Foliar application of calcium does not work as YOU STATED. That was YOUR assumption or concussion.