Sampling Procedure for Diagnosis of Nutritional Need of Fruit Crops
· 2026-10-02 22:23:30 · 3 views · 0 downloads
Sampling Procedure for Diagnosis of Nutritional Need of Fruit Crops
It is the hidden deficiency of the nutrient before the symptoms appear on the tree. Standardized tissue nutrient norms of various elements are available for different crops. The precision of such standards depending on the sampling procedures of the indexing tissue.
| S.N. | Crop | Indexing tissue for analysis | Growth stage/time | Sample size (leaves) |
|---|---|---|---|---|
| 1. | Mango | Leaves + petiole from middle of shoots | 4–7 months old leaves | 15 |
| 2. | Banana | Petiole of 3rd open leaf from apex | Bud differentiation stage, 4 months after planting | 50 |
| 3. | Guava | Recently matured leaves | 3rd pairs of leaves in August or December at bloom stage | 25 |
| 4. | Papaya | Petiole | 6th petiole from apex, 6 months after planting | 20 |
| 5. | Grape | Petiole | At bud differentiation stage | 200 |
| 6. | Pineapple | Middle 1/3rd portion of white basal portion of leaf | 4th leaf from apex, 4–6 months after planting | 100 |
| 7. | Citrus | Leaves + petiole | 3–5 month old leaf from new flush | 30 |
| 8. | Ber | Petiole of 3rd open leaf from apex | Middle of shoot, 6th from apex, 2 months after pruning from secondary or tertiary shoots | 40 |
| 9. | Avocado | Fully expanded leaves from non-fruiting terminal | Leaves of 5–7 months old shoots | 50 |
| 10. | Apple & pear | Leaves from middle of terminal shoot growth | 8–12 weeks after & 2–4 weeks after full bloom | 50 |
| 11. | Almond | 3rd leaf from top | Beginning of bloom formation of terminal buds | 15 |
| 12. | Apricot | Fully expanded leaf from mid shoot of current growth | Early June–mid July | 50 |
| 13. | Custard apple | 5th leaf from apex | 2 months after new growth | 30 |
| 14. | Cherry | Fully expanded leaves from mid shoot of current growth | July–August | 50 |
| 15. | Fig | Same cherry | Same cherry | 25 |
| 16. | Peach | Leaves | Mid shoot leaves, fruiting or non-fruiting spurs | 25 |
| 17. | Plum | Leaves from middle of current season's extension growth | January–February | 25 |
| 18. | Phalsa | Leaves | 4th leaf from apex, one month after pruning | 40 |
| 19. | Chewnut | 4th leaf from tip of mature branches | At beginning of flowering | 15 |
| 20. | Cocoa | 3rd leaf from apex | Bloom imitation | 15 |
| 21. | Sapota | Leaves | 10th leaf from apex in September | 30 |
| 22. | Strawberry | Youngest fully expanded mature leaf | Peak or harvest period | 30 |