Cultural Practices for Successful Pineapple Cultivation

Pineapple (Ananas comosus L. Merr.) is one of the most commercially important tropical fruits globally, yet achieving consistent, high-quality yields demands more than just planting and waiting. Research on pineapple production consistently shows that key cultural practices – irrigation, mulching, weed control, earthing up, and flowering induction – are the real drivers of yield and fruit quality. Getting these right determines whether a crop meets market demand or falls short.

Irrigation: watering at the right time 🔗

Pineapple is a drought-tolerant crop to a degree, but adequate moisture is critical for good yields – drought reduces both fruit size and overall productivity. In rainfed systems, irrigation is especially important during dry spells. For the popular ‘Kew’ variety grown in India, the recommended practice is five to six irrigations during dry months at intervals of approximately 20 days, maintaining an IW/CPE ratio of 0.6 with 50 mm depth per application for optimal fruit size.

In drier production regions, drip irrigation is used to maintain steady growth rates, while overhead boom sprayers or sprinklers are used to establish new planting material. The key principle is consistency – irregular moisture supply during fruit development leads to uneven growth and poor quality. Where irrigation is not available, the cropping calendar should be planned so that the harvest aligns with the onset of the rainy season, minimizing moisture stress at critical growth stages.

Mulching: conserving moisture and improving soil 🔗

Mulching is a straightforward practice with significant benefits. According to the National Horticulture Board of India, mulching is essential in rainfed pineapple cultivation and is particularly practical where flatbed planting is followed. In South India, dry leaves or straw are commonly spread between plants. Black polythene film mulch is equally effective and widely used in commercial plantations.

Scientific review of pineapple cultural treatments confirms that mulching reduces the need for herbicide applications, lowers production costs, and improves the physicochemical quality of the soil. The recommended rate for dry leaf mulch in India is 6 tonnes per hectare. Beyond moisture conservation, organic mulches decompose slowly, adding organic matter to the soil and supporting consistent soil fertility across the growing cycle. Mulch also moderates soil temperature fluctuations – a factor relevant in tropical climates where day-night temperature swings can be significant.

In commercial-scale production, plastic mulch serves multiple functions: it retains soil fumigants applied pre-plant, controls weeds, stabilizes soil temperature, and marks plant locations for field management. Both organic and synthetic mulching options are valid depending on the scale of operation and availability of materials.

Weed control: protecting the crop from competition 🔗

Weed pressure is a serious threat to pineapple productivity. Under severe weed infestation, plant crop yield can be reduced by as much as 82-83%. In Indian pineapple plantations, hariyali (couch grass) and nutgrass (Cyperus rotundus) are the most common problem weeds.

Manual weeding 🔗

Hand weeding in closely spaced pineapple crops is labor-intensive and economically inefficient, making it impractical as the sole method on larger farms. However, manual weeding remains useful for spot-removal of weeds near the plant base, where herbicides cannot be directed without risk of crop damage, particularly in young plantations before the canopy closes.

Chemical weed control 🔗

Chemical control is the preferred approach in commercial pineapple cultivation. The Pineapple Research Station, Vellanikkara (Kerala), recommends Diuron at 3 kg/ha or a combination of Diuron (1.5 kg/ha) + Bromacil (2.0 kg/ha) as a pre-emergence spray in 600 litres of water. This application should be repeated at half the dose five months after the first spray. Importantly, irrigating the field before herbicide application helps carry the chemicals to the root zone of weeds, improving efficacy.

For weeds in inter-row spaces, glyphosate at 0.8 kg/ha or a mixture of 2,4-D (0.5 kg/ha) and paraquat (0.4 kg/ha) can be used. When spraying inter-row spaces, care must be taken to avoid drift onto the pineapple plants. As the crop canopy closes, early-stage weed control measures become less effective, making timely intervention in the early crop cycle especially important.

Earthing up: preventing lodging 🔗

Pineapple has a shallow root system, which makes the plants vulnerable to lodging – toppling over under the weight of a developing fruit or due to wind pressure. Lodging during fruit development causes lopsided growth and uneven fruit development, directly affecting market quality and grade.

Earthing up involves pushing soil from the ridges into the trenches around plant bases, creating a broader, more stable mound that improves root anchorage. This practice is particularly important in trench planting systems. It is carried out periodically as the crop grows, with timing depending on plant development stage and local soil conditions. For ratoon crops, earthing up should be repeated after fertilization to ensure the regenerating plants have adequate support during the next fruiting cycle.

Flowering induction: synchronizing fruit production 🔗

Left to natural conditions, pineapple flowers erratically – triggered by short days and cool nights. This leads to staggered harvests, high labor costs, and inconsistent market supply. Chemical induction of flowering is therefore a standard practice in commercial pineapple production, enabling growers to schedule harvests, meet peak market demand, and produce fruit year-round.

How ethephon works 🔗

Ethephon (2-chloroethylphosphonic acid) is the most widely used flowering induction agent. Ethephon is an ethylene-releasing compound – when applied to the plant, it breaks down and releases ethylene gas. Ethylene is the key signaling molecule that triggers the shift from vegetative to reproductive growth in pineapple. Under natural conditions, this ethylene surge is induced by environmental cues; chemical application replicates that trigger artificially, causing the apical meristem to initiate flower development.

Signs of floral differentiation appear within 48-72 hours of ethephon treatment in the shoot apical meristem, with visible inflorescence development evident around 15 days later. The response is also dose-dependent – a critical threshold of ethylene is needed to trigger flowering reliably.

Application method and timing 🔗

Timing and plant maturity are critical for successful induction. Plants must be physiologically mature before treatment – applying ethephon too early produces small, poor-quality fruits. In Kerala, the standard protocol for the ‘Kew’ variety is to apply 25 ppm ethephon in an aqueous solution containing 2% urea and 0.04% calcium carbonate, at a rate of 50 ml per plant, poured directly into the heart of the plant. Treatment is done on physiologically mature plants at the 39-42 leaf stage, typically 16-17 months after planting (though this may vary from 11-17 months depending on sucker size used for planting).

Research has shown that combining ethephon with urea and calcium carbonate significantly increases its effectiveness, allowing lower ethephon concentrations to achieve over 90% flowering induction within 50 days of treatment. This reduces chemical input costs while maintaining high induction rates.

Temperature conditions at the time of application also matter. Ethephon treatment is less reliable on abnormally hot days, as high temperatures affect ethephon uptake through the leaf cuticle and stomata. Ethephon uptake is also modified by relative humidity and solution pH, so applications are best timed for cooler evening hours under humid conditions.

Why induction matters for market quality 🔗

The commercial value of flowering induction goes beyond just convenience. Artificial regulation of flowering enables staggered market release and year-round pineapple supply, helping stabilize prices and match demand cycles. When all plants in a block flower and fruit in synchrony, harvesting can be completed within a narrow window – chemically induced crops are typically harvested within 10 days, compared to about 70 days for uninduced crops. This dramatically reduces labor requirements and ensures uniform fruit size and ripeness grade – both critical for export and processing markets.

How these practices work together 🔗

Each of these cultural practices reinforces the others. Consistent irrigation supports healthy, vigorous plant growth that responds more reliably to flowering induction. Effective mulching reduces weed competition, lessening the burden on chemical weed management. Timely earthing up stabilizes plants during the critical fruit development phase that follows induction. Skipping or delaying any one of these practices can compromise the effectiveness of the others and reduce overall crop performance.

Successful pineapple growers work from a management calendar that coordinates all these activities across the crop cycle – from land preparation through to harvest. The margin between good and poor yields in pineapple cultivation often comes down to the precision and timing with which these seemingly routine practices are executed.

What do you think? Given that flowering induction allows year-round pineapple supply, do you think smallholder farmers in rain-fed regions face unique challenges in synchronizing these cultural practices compared to large commercial operations? And with growing interest in reducing chemical inputs, how feasible do you think it is to replace synthetic herbicides entirely with mulching-based weed management in pineapple cultivation?

References

1. https://scientificelectronicarchives.org/index.php/SEA/article/view/1487
2. https://www.ctahr.hawaii.edu/oc/freepubs/pdf/f_n-7.pdf
3. https://health.hawaii.gov/heer/files/2021/07/USDA2000.pdf
4. https://nhb.gov.in/pdf/fruits/pineapple/pin005.pdf
5. https://www.ctahr.hawaii.edu/oc/freepubs/pdf/FN-60.pdf
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC12872938/
7. https://link.springer.com/article/10.1007/PL00007062
8. https://www.sciencedirect.com/science/article/abs/pii/0304423875900059
9. https://pubmed.ncbi.nlm.nih.gov/10688702/