Fruit production

Horticulture (B.Sc Horticulture) · Crops · free study notes for exams, placements and interviews

In short

Fruit production (pomology) is the science and practice of raising perennial and semi-perennial fruit crops — propagation, orchard establishment, canopy and nutrient management, flowering and fruiting regulation, harvesting and post-harvest handling. India is the world's second largest fruit producer (roughly 105-112 million tonnes a year as per NHB/Horticulture Statistics; mango, banana, citrus, papaya, guava and grape dominate), so the subject carries the heaviest weight in a B.Sc Horticulture degree. It is examined in university papers on Fruit Science I & II, in ICAR-JRF/SRF and ARS entrance papers, and in competitive exams for Horticulture Officer, ADO and NABARD posts. Employers — nurseries, fruit exporters (APEDA-registered), agri-input and fertigation companies, Reliance/ITC/Mother Dairy fresh sourcing, FPOs and state horticulture missions — test it in technical rounds on spacing, rootstocks, pruning schedules and maturity indices.

Explained

Classification, zones and crop groups

By climate: *tropical* (mango, banana, papaya, sapota, guava, pineapple, jackfruit), *subtropical* (citrus, litchi, grape, pomegranate, phalsa, loquat), *temperate* (apple, pear, peach, plum, apricot, walnut, almond, cherry), *arid/dry* (ber, aonla, date palm, fig, custard apple, bael, tamarind).
By habit: trees (mango, sapota), shrubs (pomegranate, phalsa), vines (grape, passion fruit), herbaceous perennials (banana, papaya, pineapple).
By leaf retention: evergreen (mango, citrus, guava) versus deciduous (apple, peach, grape, pear) — deciduous crops need chilling units (hours below ~7.2 °C) to break rest; apple needs roughly 1,000-1,600 chill hours, peach fewer, which is why low-chill cultivars matter as winters warm.
By fruit structure: *simple* — drupe (mango, peach), pome (apple, pear), berry (grape, tomato), hesperidium (citrus), balausta (pomegranate); *aggregate* — raspberry, custard apple (etaerio of berries); *composite/multiple* — jackfruit, pineapple (sorosis), fig (syconus).
Indian fruit zones: temperate — J&K, Himachal, Uttarakhand; subtropical plains — Punjab, Haryana, UP, Bihar (mango, guava, litchi, kinnow); peninsular — Maharashtra, Karnataka, Andhra (grape, pomegranate, banana, citrus); humid coastal — Kerala, coastal Karnataka, West Bengal, North-East (coconut, jackfruit, pineapple, banana). Leading states: mango — UP; banana — Tamil Nadu/Maharashtra/Gujarat; citrus — Andhra/Maharashtra; grape — Maharashtra; apple — J&K and Himachal.

Propagation and rootstocks

Sexual (seed): used for rootstocks, polyembryonic mango types, papaya, and for breeding. Drawbacks — segregation, long juvenility, tall trees. Papaya is largely seed-propagated; dioecious types need 1 male per 10 females, gynodioecious hybrids avoid this.
Asexual methods: *cutting* (grape, pomegranate, fig, phalsa), *layering* — simple, mound, trench, air layering/gootee in litchi and guava with IBA 2,000-5,000 ppm in lanolin, *budding* — T/shield (citrus, ber), patch (walnut), forkert, chip budding, and in-situ ring/annular budding in ber, *grafting* — veneer and softwood (mango), epicotyl/stone grafting (mango, 10-15 day old seedlings), approach/inarching (mango, sapota), wedge and side grafting, *suckers* (banana — sword suckers preferred over water suckers), *tissue culture* (banana G-9, strawberry, date palm — uniform, virus-indexed, costlier).
Why rootstocks matter: vigour control, soil adaptation, disease resistance, precocity. Examples — apple: M9 (very dwarfing, needs staking), M26, MM106 (semi-dwarf), M7, seedling (vigorous); citrus: rangpur lime and rough lemon (vigorous, drought-tolerant), trifoliate orange (dwarfing, cold- and Phytophthora-tolerant), Troyer/Carrizo citrange; mango: Vellaikulamban and Kurukkan for dwarfing, Olour for salinity; grape: Dogridge and 110-R for salinity, drought and nematode tolerance (widely used in Maharashtra); guava: Psidium molle/pumilum for wilt tolerance.
Stionic effects: scion-rootstock interaction decides size and yield; incompatibility shows as bud-union swelling, poor growth or sudden decline.

Orchard establishment and planting systems

Steps: site survey (soil depth > 1 m, pH 6.0-7.5, good drainage) → layout and alignment → pit digging (mango 1 × 1 × 1 m, citrus 0.75 m cube) filled with topsoil + 20-25 kg FYM + single super phosphate + neem cake → windbreak and fencing → planting at onset of monsoon (evergreens) or dormancy (deciduous) → staking, basin, irrigation.
Layout systems: *square* (easy intercultivation), *rectangular*, *hexagonal/triangular* (about 15% more plants), *quincunx* (filler plant at centre of square), *contour* (hill slopes, with terracing).
Spacing and density (plants/ha = 10,000 / spacing area): mango 10 × 10 m (100), HDP mango 5 × 5 or 3 × 2 m (Ultra HDP Amrapali up to 1,600), banana 1.8 × 1.8 m (about 3,086) or paired-row high density, grape 3 × 2 m (about 1,666), pomegranate 4.5 × 3 m, papaya 1.8 × 1.8 m, guava meadow orchard 2 × 1 m (5,000), apple on M9 about 3 × 1.5 m.
High density planting (HDP): dwarf scion/rootstock + canopy regulation + fertigation; earlier returns, higher yield per hectare, easier spraying and harvest. Limits — needs precise pruning, irrigation and higher establishment cost; canopy crowding if not managed.
Intercropping and filler: vegetables, pulses, papaya or pineapple in the pre-bearing period; never a crop that competes for the same rooting zone at bearing. Multi-tier cropping (coconut–banana–pineapple–black pepper) in Kerala.

Canopy, nutrition and water management

Training shapes the young plant; pruning removes wood to regulate growth and crop. Systems — central leader, modified leader (apple, pear), open centre/vase (peach, plum), bower/pandal, kniffin and Y-trellis for grape, head system for pomegranate and guava.
Grape pruning: double pruning–single cropping in peninsular India — *April (foundation/back) pruning* builds canes, *October (forward/fruit) pruning* leaves fruiting canes; spur (2-3 buds) or cane pruning depending on cultivar (Thompson Seedless is cane-pruned to fruitful nodes).
Special operations: girdling/ringing (grape, litchi) to raise C:N and improve set and colour; notching (ber, apple); smudging (mango flowering in the Philippines); bahar treatment in pomegranate, guava, acid lime — withholding irrigation to induce rest, then root exposure, root pruning and irrigation + fertiliser to force flowering in *ambe (Jan-Feb)*, *mrig (June-July)* or *hasta (Sept-Oct)* bahar; mrig bahar is preferred in rainfed Maharashtra.
Nutrition: apply FYM and phosphorus/potash before flowering, nitrogen in splits; typical mature mango 1,000 g N : 500 g P₂O₅ : 1,000 g K₂O per tree per year with 50 kg FYM (state recommendations vary — follow the SAU package of practice). Micronutrient sprays — ZnSO₄ 0.5%, FeSO₄ 0.5%, borax 0.1% for citrus and pomegranate. Fertigation gives 25-30% fertiliser saving and better uniformity.
Water: drip is standard in grape, banana, pomegranate, citrus; crop water requirement estimated from ETo × Kc × canopy factor. Banana is the heaviest user (1,800-2,000 mm per crop). Subsidy for micro-irrigation comes under Per Drop More Crop (PDMC); orchard and nursery assistance under MIDH (NHM/HMNEH components), with nursery accreditation and planting material standards administered by the National Horticulture Board.
Physiological problems: *alternate/biennial bearing* in mango (Dashehari, Langra) — managed by deblossoming the "on" year, paclobutrazol soil drench (about 0.75-1.0 g a.i. per metre of canopy diameter, roughly 3-5 g a.i./tree, used with care and withdrawal awareness for residues), balanced nutrition; *fruit drop* in citrus and mango (June drop) — hormonal, managed with NAA 10-20 ppm, 2,4-D 10-15 ppm in citrus, GA₃; *malformation in mango* (Fusarium moniliforme var. subglutinans + mites) — NAA 200 ppm in October, pruning of malformed panicles; *fruit cracking* (litchi, pomegranate) — boron and calcium sprays, steady moisture; *spongy tissue in Alphonso* — post-harvest heat, managed by sod culture and early harvest; *granulation in citrus*; *mango internal necrosis* linked to boron.

Flowering, fruit set and growth regulators

Juvenility (unresponsive youth phase) ends earlier in HDP and grafted plants. Flowering depends on a high C:N ratio, photoperiod and temperature; mango flowering needs a cool dry spell, and the cue is largely shoot maturity plus water stress.
Pollination: mango — insect (house-fly and thrips), 0.1-1% fruit set from lakhs of flowers; apple and pear need cross-pollinisers (Red Delicious with Golden Delicious/Tydeman's Early) and 2-3 honeybee colonies per hectare; litchi and citrus benefit strongly from bees; parthenocarpy gives seedless banana, pineapple and some citrus; stenospermocarpy gives seedless grape (Thompson Seedless).
Growth regulators in practice: GA₃ 40-45 ppm for berry size in Thompson Seedless; CPPU and brassinosteroids for berry size; NAA/2,4-D for drop control; ethephon for uniform ripening in banana and pineapple and for degreening citrus; paclobutrazol/cultar for regular mango bearing; CCC for pomegranate; IBA/NAA for rooting in cuttings.
Growth curve: most fruits show a sigmoid curve (apple, banana, citrus); stone fruits and grape show a double sigmoid with a lag phase during stone hardening or veraison.

Harvest, maturity and post-harvest handling

Maturity indices: days from fruit set (banana 90-120 days), TSS and TSS:acid ratio (grape at least 16-18 °Brix and TSS:acid 20:1+ for table use), specific gravity (mango sinks in water), angularity of banana fingers, colour break, firmness, starch-iodine test (apple), juice content (citrus > 40-45%), oil-release and shoulder growth in mango.
Classification by respiration: climacteric fruits (mango, banana, papaya, sapota, guava, custard apple) ripen after harvest with an ethylene and respiration peak; non-climacteric (citrus, grape, pomegranate, litchi, pineapple) must be harvested ripe. This single distinction decides harvest stage, ripening rooms and export protocol.
Operations: harvesting with mango harvester retaining a 5-10 mm pedicel to avoid sap burn → desapping → pre-cooling → washing/hot-water treatment (mango 52 °C for 5 min against anthracnose and stem-end rot; VHT 48 °C core for fruit fly, mandatory for Japan/South Korea markets; irradiation at 400 Gy for the USA) → grading → waxing → packing in CFB boxes → cold storage → transport.
Storage: mango 12-13 °C, banana 13-14 °C (chilling injury below 12 °C), apple 0-1 °C with CA storage (1.5-2.5% O₂, 1-3% CO₂) for 6-8 months, grape 0 °C with SO₂ pads, citrus 5-7 °C. Tropical fruits suffer chilling injury; temperate fruits do not.
Losses and standards: post-harvest losses in fruits are roughly 6-15% (NABCONS/ICAR-CIPHET estimates). Export is promoted and certified by APEDA (GrapeNet, MangoNet, AnarNet traceability platforms); residue limits and food safety fall under FSSAI (Food Safety and Standards Act, 2006 and the Contaminants, Toxins and Residues Regulations); planting material and quarantine under the Seeds Act/Plant Quarantine Order; GI-tagged fruits include Alphonso, Dashehari, Nagpur orange, Bhagalpuri Jardalu mango and Shahi litchi. GST on fresh fruit is nil; processed fruit products fall in the 5%/18% slabs (slab structure revised 22 September 2025).

Key points

Pomology - science of fruit crop production, including propagation, orchard and post-harvest management.
Chilling requirement - accumulated hours below about 7.2 °C needed by deciduous fruits to break dormancy; apple 1,000-1,600 h.
Epicotyl (stone) grafting - mango propagation on 10-15 day old seedlings; fast, high success, needs mist chamber care.
Rootstock function - controls vigour and adapts the scion; M9 dwarfs apple, Dogridge gives grape salinity tolerance.
Hexagonal layout - accommodates about 15% more plants per hectare than square at the same plant-to-plant distance.
High density planting - dwarf stock/scion plus canopy regulation and fertigation; early, higher per-hectare yield.
Bahar treatment - induced rest by withholding water, then forcing flowering; ambe, mrig and hasta bahar in pomegranate and acid lime.
Alternate bearing - heavy crop one year, little the next (mango, apple); paclobutrazol, deblossoming and nutrition correct it.
Girdling - removing a bark ring to raise the C:N ratio; improves set in grape and litchi.
Double pruning, single cropping - April foundation pruning plus October fruit pruning in peninsular grape.
Climacteric fruit - ripens after harvest with an ethylene/respiration peak (mango, banana); non-climacteric must ripen on the plant.
Maturity index - objective harvest test: days after set, TSS, TSS:acid, specific gravity, starch-iodine, juice percentage.
VHT - vapour heat treatment at 48 °C fruit core for fruit-fly disinfestation, required for Japan and South Korea; the USA accepts irradiation (400 Gy) instead.
CA storage - controlled atmosphere, about 1.5-2.5% O₂ and 1-3% CO₂, extends apple life to 6-8 months.
Chilling injury - pitting and failure to ripen when tropical fruit is stored too cold (banana below about 12 °C).
Parthenocarpy versus stenospermocarpy - fruit without fertilisation (banana) versus fertilisation with aborted embryos (Thompson Seedless grape).
MIDH and PDMC - central schemes funding orchard area expansion, planting material and micro-irrigation.
APEDA traceability - GrapeNet, MangoNet and AnarNet track residues and farm identity for export consignments.

Formulas and examples

Plant population (plants/ha) = 10,000 / (row spacing × plant spacing, in m²) — square or rectangular system
Hexagonal system plants/ha = 10,000 / (0.866 × S²), S = spacing in m; gives about 15.5% more plants than square
Quincunx plants/ha = square population × 2 (one filler per square)
Yield (t/ha) = plants per ha × yield per plant (kg) ÷ 1,000
Crop water requirement (litres/plant/day) = ETo (mm/day) × Kc × canopy area (m²) × wetted factor
Compound growth rate CAGR (%) = [(Final/Initial)^1/n − 1] × 100, n = number of years
Maturity ratio = TSS (°Brix) / titratable acidity (% as tartaric or citric acid)
Benefit-cost ratio = Present worth of benefits / Present worth of costs; NPV = Σ (Bt − Ct)/(1+i)^t
Nutrient (g fertiliser/tree) = nutrient required (g) × 100 / % nutrient in the fertiliser

Example 1 — Plant population in three layouts (mango at 10 m).

Square: 10,000 / (10 × 10) = 100 plants/ha.
Hexagonal: 10,000 / (0.866 × 100) = 10,000 / 86.6 = 115 plants/ha (15% more).
Quincunx with a filler papaya at each square centre: 100 mango + 100 filler = 200 plants/ha (fillers removed by year 6-8).

Example 2 — HDP mango yield and gross return. Amrapali at 3 × 2 m, yield 10 kg/tree, price ₹40/kg.

Population = 10,000 / (3 × 2) = 10,000/6 = 1,666 plants/ha.
Yield = 1,666 × 10 = 16,660 kg = 16.66 t/ha.
Gross return = 16,660 × 40 = ₹6,66,400/ha. Compare a traditional 10 × 10 m orchard of 100 trees at 100 kg/tree = 10 t/ha = ₹4,00,000 — HDP gives 67% more income per hectare and starts yielding in year 3 instead of year 6.

Example 3 — Fertiliser calculation for a mango tree. Requirement 1,000 g N, 500 g P₂O₅, 1,000 g K₂O. Fertilisers: urea 46% N, SSP 16% P₂O₅, MOP 60% K₂O.

SSP = 500 × 100/16 = 3,125 g (3.13 kg); it supplies no N.
MOP = 1,000 × 100/60 = 1,667 g (1.67 kg).
Urea = 1,000 × 100/46 = 2,174 g (2.17 kg), applied in two or three splits.

Example 4 — Drip water requirement for banana. ETo = 6 mm/day, Kc = 1.1, spacing 1.8 × 1.8 m (area 3.24 m²), wetted factor 0.8.

Water = 6 × 1.1 × 3.24 × 0.8 = 17.1 litres/plant/day.
At 3,086 plants/ha → 17.1 × 3,086 ≈ 52,800 litres/ha/day ≈ 52.8 m³/ha/day.
Drip time with 2 emitters of 4 lph per plant = 17.1 / 8 ≈ 2.1 hours.

Example 5 — Grape maturity check. A Thompson Seedless sample reads TSS 19.2 °Brix and acidity 0.80% tartaric.

Ratio = 19.2 / 0.80 = 24:1 — above the 20:1 table-grape benchmark and above the 16-18 °Brix minimum, so the bunch is harvest-ready for the fresh market; for raisin making growers wait for 22-24 °Brix.

Crop	Usual spacing	Plants/ha	Propagation	Bearing starts	Climacteric?
Mango	10 × 10 m (HDP 3 × 2)	100 (1,666)	Veneer/stone graft	4-6 yr (3 in HDP)	Yes
Banana	1.8 × 1.8 m	~3,086	Sucker, tissue culture	11-14 months	Yes
Grape	3 × 2 m	~1,666	Hardwood cutting, graft on Dogridge	2-3 yr	No
Papaya	1.8 × 1.8 m	~3,086	Seed	9-10 months	Yes
Citrus (Kinnow)	6 × 6 m	~278	T-budding on rough lemon	4-5 yr	No
Pomegranate	4.5 × 3 m	~740	Cutting, air layer	2-3 yr	No
Apple	3 × 1.5 m on M9	~2,222	Tongue/chip graft	3-4 yr	Yes

Feature	Climacteric	Non-climacteric
Ripening after harvest	Yes, with ethylene peak	No appreciable ripening
Harvest stage	Mature green possible	Must be fully ripe
Examples	Mango, banana, papaya, sapota, guava	Citrus, grape, litchi, pomegranate, pineapple
Trade use	Ripening chambers with 100 ppm ethylene	Direct cold chain, no ripening room

Where it is used

Commercial orchards and FPOs: layout, spacing, pruning schedules and nutrient plans for mango in Ratnagiri and Malihabad, grape in Nashik, pomegranate in Solapur, banana in Jalgaon and Theni, apple in Shimla and Kinnaur.
Nurseries and planting-material industry: NHB-accredited nurseries and tissue-culture labs producing G-9 banana, grafted mango and citrus budlings; roles as nursery manager and multiplication in-charge.
Export and fresh-produce supply chain: APEDA-registered packhouses for grape (GrapeNet), mango (VHT/irradiation facilities at Vashi, Lasalgaon, Bengaluru), pomegranate; roles as QA officer, packhouse manager, cold-chain executive with Reliance Fresh, ITC, Adani Agri Fresh, Desai Fruits.
Agri-input and fertigation companies: technical advisory roles with Jain Irrigation, Netafim, Coromandel, UPL and Mahindra Agri on drip, fertigation and plant growth regulator schedules.
Government and extension: Horticulture Development Officer, ADO, KVK subject-matter specialist, MIDH and PDMC scheme implementation, state crop insurance and NABARD project appraisal for orchard loans.
Processing: mango pulp (Jain, Foods & Inns), grape raisin and wine (Sula), pomegranate and aonla products, dried fig and date units — maturity and TSS standards drive raw-material procurement.

Interview questions

Q: Why is stone or epicotyl grafting preferred for mango nurseries? A: Mango seed loses viability fast and seedlings are hard to maintain for a year; grafting on 10-15 day old epicotyl seedlings gives a high success rate, saleable plants within a few months and true-to-type scions.
Q: What is bahar treatment and why is it needed? A: Withholding irrigation to force rest, then root exposure, light root pruning and resumption of water and fertiliser, so that pomegranate, guava or acid lime flower in one chosen flush instead of continuously — giving a uniform, marketable crop at the price-favourable season.
Q: Why does mango bear alternately, and how do you correct it? A: A heavy crop depletes reserves and the current-season shoots do not mature in time to flower next year; remedies are deblossoming part of the tree in the "on" year, balanced nutrition, pruning, and a paclobutrazol soil drench to induce flowering in the "off" year.
Q: Which fruits are climacteric and why does it matter commercially? A: Mango, banana, papaya, sapota and guava ripen after harvest with an ethylene and respiration peak, so they can be shipped mature-green and ripened in chambers; citrus, grape and pomegranate must be harvested fully ripe.
Q: Why is Dogridge used as a grape rootstock in Maharashtra? A: It tolerates salinity, drought and nematodes in deep black soils and gives vigour, so vines survive poor irrigation water better than own-rooted Thompson Seedless.
Q: How does the hexagonal system accommodate more plants? A: Plants sit at the corners of equilateral triangles, so the area per plant is 0.866 S² instead of S², fitting about 15% more plants at the same plant-to-plant distance.
Q: What is VHT and which markets need it? A: Vapour heat treatment holds the fruit core at about 48 °C for a prescribed period to kill fruit-fly eggs and larvae; Japan and South Korea require it, while the USA accepts irradiation at 400 Gy, both under APEDA-approved facilities.
Q: Why is GA₃ sprayed on Thompson Seedless grapes? A: It increases berry size and elongates the rachis for loose, well-formed bunches in a stenospermocarpic cultivar; overdosing causes shot berries, thick skin and poor next-season fruitfulness.
Q: Why should a banana consignment not be stored at 8 °C? A: Below about 12 °C banana suffers chilling injury — dull peel, subcutaneous browning and failure to ripen — so 13-14 °C is used.
Q: What is the difference between training and pruning? A: Training directs the framework and shape of the young plant largely by bending, tying and selective removal; pruning removes shoots or branches from a bearing plant to regulate growth, light and crop load.
Q: Why is sap removed from mango immediately after harvest? A: The latex causes sap burn — black lesions on the shoulder that downgrade the fruit; harvesting with a short pedicel and inverting the fruit for desapping prevents it.
Q: Name one physiological disorder with its cause for mango, litchi and citrus. A: Mango spongy tissue (post-harvest heat and convective field heat, plus poor Ca status), litchi fruit cracking (moisture fluctuation with boron deficiency), citrus granulation (excess moisture and nitrogen with poor maturity).

Common mistakes

Writing "plants/ha = 10,000/spacing" without squaring or multiplying the two spacings — and forgetting the 0.866 factor in the hexagonal system.
Treating girdling, notching and ringing as the same operation, or claiming girdling increases vegetative growth (it restricts it and raises C:N).
Calling every seedless fruit parthenocarpic; grape seedlessness is stenospermocarpy, where fertilisation occurs and the embryo aborts.
Quoting a single national fertiliser dose as if it were universal — doses are per-tree, age-dependent and set by each state agricultural university's package of practice.
Storing tropical fruit at temperate-fruit temperatures in practicals and exam answers, ignoring chilling injury.
Confusing June drop (physiological fruit drop) with pest-induced drop, and prescribing NAA for a fruit-fly problem.
Mixing up mango flowering regulators: paclobutrazol for regular bearing versus NAA 200 ppm in October for malformation control; and assuming HDP works without pruning and fertigation.