Rajendra Jamun-1
A jamun credited to Bihar Agricultural College, Sabour (Bhagalpur). We found no release year, fruit data, yield or trial result for it. Judge it on a fruiting tree and a pulp test.
Quick facts
- Type
- Open-pollinated
- Season
- Kharif
- Starts bearing
- Grafted plant: first fruit in about 4–7 years (guides differ; TNAU says 6–7)
- Expected yield
- No separate figure published
- Suitable soil
- Loam
- Disease resistance
- No separate figure published
- Release
- Bihar Agricultural University, Sabour, Bihar
Actual yield depends on sowing time, soil, irrigation, weather, seed quality and crop management.
About this variety
Rajendra Jamun-1 is a jamun variety credited to Bihar Agricultural College, Sabour, Bhagalpur, in Bihar. Crop guides list it, but we found no release year, fruit weight, pulp share, TSS or yield per tree, and no trial result. It is not one of the four cultivars in the Godhra, Karnal and Punjab trials. So we cannot rank it against other jamun. What we can give is a simple test you can run on any fruiting tree, set against the published numbers for the cultivars that were measured.
Should you pick this variety?
Choose Rajendra Jamun-1 only if you farm in Bihar, can see a fruiting tree, and the pulp test on its fruit looks good. No trial figures back it. If you want a documented pick, Goma Priyanka (highest yield at Godhra, 85–90% pulp) or CISH J-37 (the only sodic-tolerant one at Karnal) have published numbers. Whichever you pick, buy grafted plants.
Sowing & cultivation
- Sowing timeSpring (February–March) or monsoon (July–August). The monsoon is better (TNAU).
- Spacing10 × 10 m (TNAU). The Godhra trial planted these cultivars at 5 × 5 m.
- Sowing methodPlant a budded or grafted plant, not seedling jamun, in a 1 × 1 × 1 m pit filled with 75% top soil and 25% well-rotted farmyard manure or compost (TNAU).
- IrrigationYoung trees need 8 to 10 irrigations a year. A mature tree needs about half that, given in May and June while the fruit ripens. In autumn and winter irrigate only when the soil is dry (TNAU).
- HarvestingHarvest in June–July by hand. Ripe fruit cannot stay on the tree, so pick as it ripens (TNAU).
Soil & climate
Soil
- Suitable soil
- Deep, well-drained loam gives the best yield. The tree tolerates salinity and waterlogging. Very heavy or very light sandy soils are uneconomical (TNAU).
Climate
- Climate
- Tropical and subtropical, up to 1,300 m in the lower Himalayas. Dry weather is needed at flowering and fruit set, and early rain helps ripening (TNAU).
Advantages & considerations
Why farmers may choose it
- A Bihar-linked selection, so a fruiting tree may be within reach
- Named and traceable to Bihar Agricultural College, so you can ask the source about the mother tree
Things to consider
- No release year, fruit weight, pulp share, TSS or yield is published for it that we could find.
- It was not part of the Godhra, Karnal or Punjab trials, so there is no comparison with other cultivars.
Suitable regions
States this variety is recommended for — check locally, since a state can have more than one recommended zone.
- Bihar
Weigh and cut 20 fruits: a pulp test against the benchmarks
Because no figures are published for Rajendra Jamun-1, make your own from a fruiting tree. Pick 20 ripe fruits of average size. Weigh them together, and divide by 20 for the average fruit weight.
Then remove the stones, weigh the stones, and work out pulp share: (fruit weight minus stone weight) divided by fruit weight, times 100. Skin counts as pulp in this simple test, so your number will read a little high.
Compare with what was measured elsewhere: CISH J-42 over 92% pulp, Goma Priyanka over 85% (ICAR says 85–90%), Konkan Bahadoli 80%. Konkan Bahadoli's average fruit was 13.16 g with a 3.05 g stone in the IIHR study. A tree whose fruit has a small stone and a pulp share near 90% is worth planting. A big-stone tree is a table fruit at best.
Where the planting material comes from
This variety is a grafted plant: the variety on top, joined onto a rootstock below. Seed out of its fruit will not come up as this variety, so it cannot be kept as seed. Buy grafted plants from a registered nursery or a government farm, so the plant is true to the variety and free of disease.
How it compares with other varieties
Every Jamun (Indian Blackberry) variety with a page on this site, side by side. The row for this page is highlighted.
| Variety | Best for | Starts bearing | Yield | States |
|---|---|---|---|---|
| CISH J-37 | Jamun on sodic or alkaline land, where the other cultivars lose more growth | Grafted plant: first fruit in about 4–7 years (guides differ; TNAU says 6–7) | No kg-per-tree figure published; second-highest yield of four cultivars at Godhra | Uttar Pradesh |
| CISH J-42 (seedless type) | A seedless jamun for fresh sale or pulp, on ordinary non-sodic land | Grafted plant: first fruit in about 4–7 years (guides differ; TNAU says 6–7) | No kg-per-tree figure published; lowest yield of four cultivars at Godhra | Uttar Pradesh |
| Goma Priyanka | A productive, smaller jamun tree for closer planting on ordinary soil | Grafted plant: first fruit in about 4–7 years; ICAR's 50–70 kg a tree is from the 10th year | 50–70 kg/tree from the 10th year (ICAR) | Gujarat, Maharashtra |
| Konkan Bahadoli | A jamun that grafts with fewer losses, for nurseries and first-time farmers | Grafted plant: first fruit in about 4–7 years (guides differ; TNAU says 6–7) | No kg-per-tree figure published; below Goma Priyanka and CISH J-37 on yield at Godhra | Maharashtra, Karnataka |
| Narendra Jamun-6 | An eastern Uttar Pradesh jamun to plant only after you have seen it fruiting | Grafted plant: first fruit in about 4–7 years (guides differ; TNAU says 6–7) | No separate figure published | Uttar Pradesh |
| Rajendra Jamun-1this page | A Bihar jamun to plant only after a fruit and pulp test on a tree you can see | Grafted plant: first fruit in about 4–7 years (guides differ; TNAU says 6–7) | No separate figure published | Bihar |
Tools for this crop
The numbers you need next: how much seed to buy, whether the lot germinates, what the fertilizer bill looks like and what Jamun (Indian Blackberry) is selling for.
- Seed Rate CalculatorHow much seed your Jamun (Indian Blackberry) plot needs, corrected for the germination of the lot you bought.
- Germination CalculatorTest 100 seeds from the bag before sowing and see whether the lot is fit to sow.
- Seed Variety FinderFilter every Jamun (Indian Blackberry) variety on this site by state, season, duration and soil.
- Fertilizer CalculatorTurn the NPK recommendation for Jamun (Indian Blackberry) into bags of urea, DAP and MOP for your field size.
- Crop CalendarMonth-by-month sowing, weeding, irrigation and harvest dates for Jamun (Indian Blackberry) in your state.
- Crop Profit CalculatorPut your seed, labour and input costs against the yield you expect from this variety.
- Mandi Price CheckerToday's Jamun (Indian Blackberry) rate in your nearest mandi, before you fix a price with a trader.
Subsidy and government support
Schemes that help with the cost of Jamun (Indian Blackberry) seed or planting material. Rules and the application route are on each scheme page.
Frequently asked questions
Who released Rajendra Jamun-1?
Crop guides credit it to Bihar Agricultural College, Sabour, Bhagalpur. We found no release year, notification or trial paper. Write to the university and ask for its record, and for a fruiting mother tree you can look at.
Does jamun like the wet fields of Bihar?
Jamun tolerates waterlogging and some salinity (TNAU), which helps in low-lying land. But TNAU says deep, well-drained loam gives the best yield, and very heavy soils are uneconomical. Do not plant in a pit that holds water for long, and add the 25% farmyard manure to the pit mix.
How long before a grafted Rajendra Jamun-1 tree fruits?
TNAU says a grafted or budded jamun bears in 6–7 years and starts commercial bearing 8–10 years after planting. A seedling takes 8–10 years. No source gives a separate age for Rajendra Jamun-1.
Should I choose Rajendra Jamun-1 or a variety with published trials?
If you need a number to plan around, take a variety with trials: Goma Priyanka, with ICAR's 50–70 kg a tree from the 10th year, or CISH J-37 for sodic land. If you can see Rajendra Jamun-1 fruiting nearby and the pulp test is good, plant a small block of it beside one of those and compare for a few seasons.
Sourced from: Jamun — TNAU Agritech Portal, Horticulture: Fruits, Impact of systematic improvement in jamun cultivars on yield and quality of fruits — Indian Journal of Arid Horticulture (ICAR e-Pubs), Physiological traits underlying sodicity tolerance in jamun cultivars — PeerJ / PMC, Effect of grafting on success and survivability of jamun varieties — Journal of Horticultural Sciences (ICAR-IIHR). editorial policy.