Technology - Walnut
walnut production technology
1. “Advance Production Technology of Walnut ” Submitted to Submitted by Dr. M. J. Patel Pawan Kumar Nagar Associate Professor M.Sc. Fruit Science Dept. of Horticulture. Dept. of Horticulture. BACA, AAU, ANAND BACA, AAU, ANAND
2. WALNUT Overview of Walnut Botanical Name : Juglance regia Family : Juglandaceae Centre of Origin : Central Asia Chromosome No. : 2n= 32 Sex Form : Monoecious Infloresccence : Catkin Growth Curve : Double Sigmoid Fruit Type : Nut Edible Part : Cotyledon Bearing : Axillary old Branches
3. WALNUT conti.. Propagation : Patch Budding Type of Dichogamy : Heterostyly Chilling Req. : 200-800 hours Nature of fruit : Non-Climecteric Nature of Plant : Decidous & 10-40 m. tall Energy : 687 calory Mode of Pollination : Cross pollination Mechanism of Poll. : Anemophyllous (Wind) Species- Butter nut : J. cenaria Heart nut : J. cordiformis J. nigra, J. hindsi
4. WALNUT conti.. Training System : Modified Central leader Acid Present : Ascorbic & Omega 3 F.A. Rootstock : Paradox Dichogamy : Prtoandry Harvesting : Aug.-Sept. Protien : 14-20% Fat : 60-70% Largest Producer is USA (70% of world) India stands 8th in production Wallnut have Allelopathic Effect
5. INTRODUCTION Walnut (Juglans sp.) is the most important temperate nut fruit of the country. It is grown in jammu and Kasmir, Uttar Pradesh and Himachal Pradesh. There are no regular orchards of walnuts in country because the existing planting are generally of seedling origin. The seedling trees attain giant size and start bearing nuts of variable size and shape after 10-15 years, whereas vegetatively propagated plants are true to type and produce almost uniform sized nuts after 4-5 years. They remain within manageable size. But the major constraint is low success in vegetative propagation. Limited availability of scion material from desired tree results in very few vegetatively propagated plants. Most valuable Exchange Earning nut crop.
6. Species and classification Sect. Juglans. Leaves large (20-45 cm) with 5-9 broad leaflets, hairless , margins entire. Wood hard. Southeast Europe to central Asia. Juglans regia L. (J. duclouxiana Dode, J. fallax Dode, J. orientis Dode) - Persian Walnut, Carpathian, or Common Walnut Juglans sigillata Dode - Iron Walnut (doubtfully distinct from J. regia) Sect. Rhysocaryon. Leaves large (20-50 cm) with 11-23 slender leaflets, finely pubescent, margins serrated. Wood hard. North America, South America. Juglans australis Griseb. (J. boliviana Dode) - Argentine Walnut Juglans brasiliensis Dode - Brazilian Walnut Juglans californica S.Wats. - California Walnut Juglans hindsii (Jepson) R.E.Smith - Hinds' Walnut Juglans hirsuta Manning - Nuevo Leon Walnut Juglans jamaicensis C.DC. (J. insularis Griseb.) - West Indies Walnut Juglans major (Torrey) Heller (J. arizonica Dode, J. elaeopyron Dode, J. torreyi Dode) - Arizona Walnut Juglans major var. glabrata Manning Juglans microcarpa Berlandier (J. rupestris Engelm.) - Texas Walnut or Little Walnut Juglans microcarpa var. stewartii (Johnston) Manning Juglans mollis Engelm. - Mexican Walnut Juglans neotropica Diels (J. honorei Dode) - Andean Walnut Juglans nigra L. - Black Walnut Juglans olanchana Standl. & L.O.Williams - Juglans peruviana Dode - Peruvian Walnut Juglans soratensis Manning - Juglans steyermarkii Manning - Guatemalan Walnut Juglans venezuelensis Manning - Venezuela Walnut Sect. Cardiocaryon. Leaves very large (40-90 cm) with 11-19 broad leaflets, softly downy, margins serrated. Wood soft. Northeast Asia, eastern North America. Juglans ailantifolia Carr. (J. cordiformis Maxim., J. sieboldiana Maxim.) - Japanese Walnut Juglans cinerea L. - Butternut Juglans mandshurica Maxim. (J. cathayensis Dode, J. formosana Hayata, J. hopeiensis Dode, J. stenocarpa Maxim.) - Manchurian Walnut or Chinese Walnut.
7. NUTRITIONAL VALUE Excellent source of Proteins (14-20%) Excellent source of Fats (60-70%) Rich in Omega 3, vitamin B and E, fibres and trace elements; High energetic value; Highly recommended to athletes; Immature fruits are rich in Ascorbic acid. There’s already a Canadian and world market for Walnuts Walnut have high Anti-oxidant content(vitamin-E)
8. Sl.No Content Amount/100g 1 Water 3.5 % 2 Protein 14.8 g 3 Fat 64.0 g 4 Carbohydrate 15.8 g 5 Fibre 2.1 g 6 Ash 1.9 g 7 Calcium 99 mg 8 Phosphorus 380 mg 9 Iron 3.1 mg 10 Sodium 2 mg 11 Potassium 450 mg 12 Magnesium 131 mg 13 Vitamin A 30 I.U * 14 Thiamine 0.33 mg 15 Riboflavin 0.13 mg 16 Niacin 0.9 mg 17 Vitamin C 2 mg NUTRITIONAL VALUE
9. USES AND COMPOSITION Walnut kernel (the edible portion) is very rich in protein, fat and minerals and is a concentrated source of energy. The walnut kernels are used for dessert purposes in confectionery and for extraction of oil and as a dry fruit. Immature fruits are used for making pickles, chutneys, marmalades, juice and syrups. Walnut oil is used for edible purposes, artist oil colours, varnishes and soap making. Walnut shell flour is used as ingredient in plastic pillers, battery cases, moulding resin forms, industrial tile and as insecticide spreader. Walnut timber is used for furniture, carving and making butts of guns.
10. CLIMATE Climate highly sensitive to the extremes of winter and summer temperatures as well as to its duration. climate which is free from frost in spring and from extreme beat in summer. A temperature of even 2 or 3 degree below freezing point (0oC) kills leaves, shoots and flowers and thus resulting into a crop failure. High temperature of about 38°C causes sun-burning of hulls and shriveling of kernels resulting sometimes in empty nuts. An annual rainfall of about 80 cm is considered sufficient for the cultivation of walnut which can be supplemented drier regions with irrigations, particularly for young plants.
11. SOIL Soil A well drained, deep sill loam soil containing an abundance of organic matter is the most suitable for walnut cultivation. Soil analysis of top soil and sub-soil is also essential as the walnut requires a fertile and well drained top soil and the sub-soil should be free from solid rock, impervious clay or gravel layers which restrict root growth. A soil depth of 2-3 metres give the best results, because walnut roots penetrate up to a depth of about three metres. It requires a soil pH of neutral range i.e. 6 to 7.
12. VARIETIES Varieties All walnut trees in India are of seedling origin, thus no standard named varieties exist. However, a large number of cultivars have been evolved in the USA which is the main walnut exporting country of tile world. Description of some important varieties are given here. I. Hartley It is one of the most popular commercial cultivars of California. It is a selection from a seedling. The nuts are large with broad flat base and pointed tip. The shell is light coloured, thin and seals well. The variety is tolerant to codling moth and blight disease. 2. Payne It is tile second leading cultivar of California which originated as a seedling. Nut is medium to small in size with a good seal. Trees are moderately vigorous, round in shape and require heavy pruning to maintain vigour.
13. VARIETIES conti… 3. Franquette It is an old and leading cultivar of France. Nut is small, good shell seal and kernel is light. in colour. Tree is large and upright in nature and is known for its late bud break thus escaping injury from frost during late spring. 4. Serr It was evolved from a cross of Payne X PI 159568. It is heavy yielding and well adapted to warm conditions. The tree is very vigorous and gives poor yield on very fertile soils. The kernel is light in colour and good in quality. It is susceptible to codling moth and blight disease. 5. Ashley It is a high yielding, early bearing cultivar which requires heavy pruning to keep the tree vigorous. Kernel is of high quality, good in flavour and light tan in colour. This variety is unsuitable for high rainfall areas due to blight problem.
14. VARIETIES conti… 1. Hamdan 12. Sulaiman 2. CITH Walnut - 1 13. CITH Walnut - 2 3. CITH Walnut – 3 14. Walnut - 4 4. CITH Walnut – 5 15. CITH Walnut - 6 5. CITH Walnut – 7 16. CITH Walnut - 8 6. CITH Walnut – 9 17. CITH Walnut-10 7. Partap 18. Kotkhai Selection-1 8. Chakrata Selection 19. Tehama 9. Chandler 20. Sunland 10. Chico 21. Vina 11. Howard 22. Pedro
15. PROPAGATION Propagation Walnut can be propagated either by seed or by vegetative methods. Both of these methods are described here. 1. Seed propagation- Healthy and disease free seeds should be selected for sowing. They may be sown in lines 50 cm apart and the seed to seed distance should be kept at 25 cm. Sowing is done during mid-November to mid-January depending on the altitude and temperature. it is advisable to avoid propagation by seed because the plants which are grown by this method take a very long time (10 to 12 years) to begin fruiting and the plant characteristics may also not be true to type. 2. Vegetative propagation Walnut can be propagated vegetatively by grafting, budding and stooling.
16. PROPAGATION conti.. 1. Grafting Tongue or whip grafting, cleft and veneer grafting during February and early March have given good results. Epicotyl grafting has also given encouraging success in tile propagation of walnut. The best period for grafting is January -February. For propagating tile plants through veneer grafting, 5-6 month old scion wood of 15 cm is grafted on the rootstock of same thickness. The selected scion wood should be defoliated 15 days prior to its detachment from the scion cultivars. The optimum time for veneer grafting under mid -hill condition is July -August. One year old seedlings of hard shelled walnut or black walnut can be used as rootstock. Scion for tongue grafting should always be selected from the tree which has already started fruiting.
17. PROPAGATION conti.. 2.Patch budding is generally practiced to propagate walnut plants vegetatively. The best period for budding is May -June. Scion should always be selected from the tree which has already started fruiting.
18. PLANTING & IRRIGATION Planting Square system & Pits of 1.25 X 1.25 x 1.25 m size at a distance of 10 X 10 m should be dug during September. The pits should be filled up with orchard soil mixed with 50 kg well rotten FYM, 150 g Aldrin dust, 150 g urea, 500 g each of superphosphate and MOP. Walnut plantating in Dec.-Jan. The plant should be well fixed in the soil and the adjoining portion of scion and stock union should be at least 15 cm above the ground surface. Watering should be done soon after plantation. To protect the plant from collar rot it should be treated with Dithane Z- 78 before planting. Irrigation Watering is very essential for the establishment of grafts and young plants.. When the trees start bearing, irrigation should be given from the time of fruit set till its maturity to reduce the fruit drop and for better filling of nuts. When the trees are grown under rainfed conditions and common irrigation systems followed are flood, furrow, sprinkler and drip irrigation.
19. Persian Walnut Planting Plan Tree spacing 28' x 28' x 40' in a triangular pattern. Area = 1.1 Acres or 0.45 ha. Gl, G2 and G3 are 3 different grafted cultivars totaling 60 trees FUTURE FOLLOW UP When trees crowd, remove the 30 trees in the even numbered walnut rows. Good trees can be tree spaded into a new planting that will begin to bear in a few short years. Gl should be a prolific variety like Lake to maximize the early year production
20. TRAINING & PRUNING Modified central leader system is most ideal for training since it provides very good strength to its framework. Trees should be trained on a single stem up to 1–2m, on which 5–6 scaffold branches should be retained at almost uniform distance spirally. Excess buds should be pinched during first year. Pruning is not being practiced in our country, as almost entire plantation is of seedling origin, attaining giant size which makes pruning in later years almost impossible. However with grafted plants, pruning is practicable which can help increase the productivity and improve the quality. Trees of seedling origin receive some kind of pruning while harvesting by thrashing the limbs with wooden poles. It is however a crude method which needs to be modified.
21. MANURES & FERTILIZERS Use the following guide below as a indicative amount of NPK for the walnut in the absent of plant and soil nutrients analysis information: Year N Dose (g/tree) Location: circle around the tree (m) 1 100 0.5 2 200 1.0 3 300 1.5 4 400 2.0 5-7 500 2.5 7-9 600 3.0 >10 900 3.0 • In the first five years, place small amounts (about 100 g) of P and K per tree. From fifth year up to full production, apply 40-80 kg/ha of P and 60-100kg/ha of K based on soil fertility and plant vigour.
22. FLOWERING Imperfect flower separate pistillate (female) & staminate(male) Monoecious
23. BEARING Self – fertile, but dichogamous Pollen release from male flowers dosen’t coincide with bloom of female flowers Pollinizer needed Age to commercial bearing 6-10 yrs Tree density at full production 30-50 trees/ acre Peaches often interplanted for first 10-15 years
24. A green husk surrounds the nut of the English Walnut. The husk naturally splits at the time of ripening to release the nut
25. Persian Walnut, Juglans regia
26. The shells of walnuts
27. Juglans regia walnuts.
28. Mature walnut fruit closeup English walnut leaf
29. Inside of a Persian Walnut nut with green outer layer visible in the top left corner
30. The shell of the English walnut is light brown, hard, and bumpy. It is roughly oval and tapers at the bottom. The shell has an vertical seam dividing it into two halves.
31. Walnut meats have a lobbed and wrinkled appearance. The outside is golden brown and the inside white to light brown. Inside each shell are two nuts, separated by a thin, paper-like layer. Each nut meat resembles a butterfly or wings, with two flared lobes joined by a smaller centre section. Walnuts can be confused with pecans, but pecans look more like a brain than wings
32. English walnut trees grow 40 to 60 feet in height and width and have an rounded to spreading shape to their canopy.
33. English walnut leaves are compound and arranged alternately along the stem
34. The leaf is composed of 5 to 9 leaflets, each reaching a length of 2 to 5 inches.
35. English walnut and Black walnut differ in the number of leaflets, the shape of the leaflets, and the leaflet margin. black walnut leaves have a greater number of leaflets (15-23) than English walnuts (5-9). English walnut leaflets have more oval shaped leaves while black walnut leaves are generally smaller and narrower in shape. Black Walnut leaflets have toothed margins while English walnut leaflet margins are entire.
36. English walnut and Butternut have the same general leaf shape. They differ in the number of leaflets, butternut has 11-19 leaflets, while English walnut has only 5-9. Also, butternut has a toothed margin, while the leaf margin of the English walnut is entire.
37. Black walnut fruit is usually between two and three inches in diameter. The husk (shown here) is rough and light green in color and forms the outer layer of protection for the nut
38. Black walnuts grow in clusters amidst the pinnately compound leaves
39. Walnuts are usually harvested when hull colour changes from green to yellowish with cracks or when splitting starts at suture from pedicel end. Nuts should be harvested at PTB stage (when packing tissue turns brown). For better nut recovery, the orchard floor should be cleaned and tarpaulin or polythene sheets may be spread on the floor beneath trees prior to knocking of the nuts. After harvesting, nuts should be properly dehulled, washed and dried. In case nuts are not dried properly there is every apprehension of mould development which impairs the quality of the fruit. In Himachal Pradesh harvesting commences from August and extends up to last week of September, whereas in Kashmir walnuts are harvested in September. HARVESTING AND POST HARVESTMANAGEMENT
40. The shell is brown and wrinkled in appearance and and is the second layer of protection for the nut. The nut is found inside the shell.
41. Black walnut trees are very large, ranging from 50 to 75 feet in height and width.
42. Walnut shoot cut longitudinally to show chambered pith. Scale in mm
43. Black walnut kernels are often used in the manufacturing of ice cream, commercial baking, and candy making
