Plant Genetic Resources and Crop Improvement
Agrifound Dark Red: Bulbs are dark red in colour, globular in shape with tight skin, moderately pungent. Mature in 95-110 days after transplanting. Recommended for growing in Kharif season to all over the country.
Agrifound Light Red: Bulbs are globular in shape with tight skin and light red colour.Mature in 110-120 days after transplanting and keeping quality good. Recommended for growing in Rabi season to all over country.
NHRDF-Red (LINE-28): Bulbs are attractive dark red in colour. Variety is very popular among farmers in North India because of its attractive dark red and better storage performance. Mature in 110-120 days after transplanting. Recommend for cultivation in Northern, Central and Western India in Rabi season.
NHRDF-Red-2 (L-355): Bulbs are attractive red in colour, globular in shape with tight skin. Mature in 100-120 days after transplanting. Recommended for growing in Rabi season.
Agrifound White: Bulbs are globular in shape, tight skin and silvery attractive white colour. Mature in 110-130 days after transplanting and keeping quality good. Suitable for cultivation in late Kharif and Rabi seasons. Good variety for dehydration. Recommended for Maharashtra, Madhya Pradesh and Gujarat.
Agrifound Rose: Bulbs are flatish round in shape, deep scarlet red in colour. Mature in 95-110 days from sowing. Variety is suitable for growing in Kharif in Andhra Pradesh and in all three seasons in Karnataka.
Agrifound Red: Average size of cluster is 7.15cm with weight of 65-67 g. Average numbers of bulblets per cluster 5-6. Colour of bulblets is light red. Mature in 65-67 days after planting. Recommended for cultivation in Kharif and Rabi in Tamil Nadu, Karnataka and Kerala.
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Crop Production System Management
To harness the real genetic potential of a variety, the integrated approach in crop production system in terms of plant nutrients, irrigation and weed management is essential. The NHRDF has developed technologies in onion as well as garlic based on consistent research and recommended for adoption to farmers.
To get the quality bulblets (sets), sowing of Agrifound Dark Red seed @ 15-25 g/m2 in between 5th to 25th January under Nashik conditions of Maharashtra and 15th to 30th January under Karnal conditions of Harayana are recommended for better germination and higher recovery of acceptable size (1.5 – 2.0 cm.) of bulblets.
The transplanting of 6-7 weeks old seedlings between 15th July and 31st August for kharif crop, 8-9 weeks old seedlings during October-November for late kharif (rangda) crop while December-January for rabi crop at a spacing of 12.5 – 15.0 cm x 10.0 cm have been recommended.
Planting of 1.5-2.0 cm sized bulblets at a spacing of 10.0 x 10.0 cm on Broad Based Furows system is recommended in kharif season for early crop. The use of Cytozyme @ 0.2 % as root dip before transplanting followed by foliar application of the same at 15 and 45 days after transplanting is recommended for higher yield during rabi, as well as kharif.
Foliar spray of water soluble fertilizers (specialty fertilizers) NPK-19:19:19 @ 1 % at 15,30 and 45 days after transplanting followed by NPK-13:0:45 @ 1 % at 60,75 and 90 days after transplanting are recommended for getting quality bulb and higher yield. The foliar application of Zinc @ 3ppm + Copper @ 1ppm + Boron @ 0.5 ppm are recommended for enhancement of plant growth, bulb yield and quality. The foliar application of wettable sulphur @ 1 % at 15, 30, 45 and 60 days after transplanting are recommended for higher bulb yield with less disease and pest load.
Use of Pendimethalin @ 3.5 l/ha or Oxyfluorfen @ 0.15 Kg. a.i/ha at 3 days after transplanting are recommended for effective weed control in onion alongwith one handweeding at 25-30 days after transplanting in kharif crop and 40-45 Days After Planting in rabi crop. The use of rice straw mulch or wheat straw mulch during rabi season is recommended to enhance the yield also.
The irrigation of field at 4 to 8 hours before transplanting is recommended during kharif season under Karnal conditions of Haryana for better establishment of seedling and higher bulb yield. The irrigation at 1.25 ratio (Irrigation Depth/Cumulative Pan Evaporation) is recommended for higher yield during rabi season. The drip irrigation enhances the yield and quality of bulbs in onion and thus recommended to farmers.
Plant Health Management
Damping off disease of onion nursery
Soil solarization using 250 guage transparent polythene for 25 days followed by soil treatment with Trichoderma viride/T.harzianum @ 5 kg/ha or Thiram @ 5g/m2 in nursery beds and seed treatment with T. viride/T.harzianum @ 5 g/kg or Thiram @ 2.5g/kg seed recommended for effectively control of damping off disease in nursery.
Foliar diseases of onion
Mancozeb (Dithane M-45) @ 0.25% Chlorothalonil (Kavach) @ 0.2 % or Propineb (Antracol) @ 0.2 % with sticker sandovit @ 0.06% sprays at 10 days intervals or four sprays of Mancozeb @ 0.25%+Monocrotophos @ 0.05% recommended to control the purple blotch (Alternaria porri) and stemphylium blight (Stemphylium vesicarium). Carbendazim (Bavistin) @ 0.1 % (1.0g/L of water) or Benlet @ 0.1 % followed by Dithane Z-78 @ 0.2 % with sticker sandovit @ 0.06% sprays at 10 days intervals effectively control the colletotrichum blight or twister disease (Colletotrichum gloesporioides).
Spraying of Streptocycline @ 0.02% (200 ppm) 10-15 days before harvesting recommended for the control of bacterial brown rot in onion. Application of Trichoderma viride/T.harzianum @ 5 kg/ha or Pseudomonas fluorescens @ 5kg/ha in the soil before planting of seedlings recommended for the management of basal rot (Fusarium oxysporum) and white rot (Sclerotium rolfsii) of onion.
Foliar diseases of onion seed crop
Six sprays of Mancozeb @ 0.25% + Monocrotophos @ 0.05% at 15 days intervals proved best for the control of purple blotch and stemphylium blight as well as thrips in onion seed crop.
Management of thrips
Nursery: - The spray of deltamethrin 2.8% EC @ 0.095% reduced the thrips population in onion nuesery.
Onion bulb crop: - Foliar sprays of profenofos 50% EC @ 0.1% at 15 days interval (4 sprays) or 3 sprays of fipronil 5% SC @ 0.15% at 15 days interval or 4 spray of deltamethrin 2.8 EC @ 0.095% at 15 days interval or 6 sprays of spinosad 45% SC @ 0.1% at weekly interval alongwith sticker @ 0.06% considerably reduced the thrips population and increased the yield. Transplanting of onion with border of maize and one line in center in plot size of 3.6m x 1.8m performed better in minimizing thrips population and giving higher yield in Karnal area of Haryana.
Onion seed crop: - Drenching of chloropyriphos in soil, control the onion maggots. Spray of deltamethrin 2.8% EC @ 0.095% or Fipronil 5% EC @ 0.1% before flowering of onion and spray of spinosad 45% EC @ 0.1% or Azadirachtin 1500 ppm @ 5 ml / litre recommended for controlling thrips population as well as in managing borers.
Post Harvesting Technology
Post harvest losses in onion and garlic are remarkable which could be reduced considerably by adopting appropriate post-harvest management practices. The NHRDF has developed technologies for bringing down the losses in onion as well as garlic.
Withholding irrigation at 10 – 15 days before harvesting and harvesting at one week after 50% top fall are recommended to reduce post – harvest losses in onion. Application of Maleic Hydrazide @ 2000-2500 ppm is recommended to reduce storage losses during kharif season. Windrow curing of bulbs till complete drying of tops (foliage) and cutting of tops leaving 2.5 cm neck above the bulbs followed by shade curing for 10-15 days before storage reduces the losses and recommended to the farmers. Artificial curing of onion bulbs in curing chamber with full load at 350C temperature and velocity of air flow at 3.2m/s cured the bulbs is 16 hours is recommended for adaptation to farmers.
The improved onion storage structures designed and developed by NHRDF having ventilation from all sides including bottom are recommended for adaptation to reduce post harvest losses. These structures are of 5,10,20,25 and 50 MT capacity suitable for farmers to hold stocks and avoid distress sale. The 5 ton capacity godown is single tier structure have 3.75 m length and 1.5 m width 2 cubicles of 1.88 x 1.5 x 1.5 m size, while 10 t capacity structure have 7.5 m length and 1.5 m with 4 cubicles of 1.88 x 1.5 x 1.5 m size suitable for farmers cultivating less than one acre area and one acre area, respectively. The 15 ton capacity godown is also single row structure with 6 cubicles having 11.25 cm length and 1.5 m width while 20 ton capacity godown is double row structure with passage of 1.2 m between 2 rows to facilitate filling and unloading of bulbs and also sufficient aeration from all sides. These godowns are suitable for farmers cultivating onion on 2 acre and 1 hectare area, respectively. The 25 MT capacity structure is of more permanent nature, suitable for medium farmers and onion storage is done in cubicles arranged in 2 rows with 1.2 m wide passage between 2 rows, however, as most of the farmers cultivate onion in more than one hectare area, 50 ton capacity structures are more popular, which has two rows structure with 1.2 m wide passage between 2 rows and have total length of 18.75 m, width 1.25 m where piling height is maintain for better storage of bulbs.
Highest seed yield was obtained when 4.5 to 6.5 cm diameter bulbs were planted on 15th October at the spacing of 30 cm x 30 cm at Karnal whereas at Nashik 20th October planting was found best and economical. Dipping onion bulbs in 1% potassium nitrate and 0.1% Carbendazim before planting for seed crop in kharif season and dipping 0.1% Carbendazim in rabi season are effective for getting higher seed yield. Drip irrigation with wheat or paddy straw mulching has been recommended for effective weed management and getting higher seed yield. Irrigation interval of 10 days throughout the cropping period or 12 days up to 60 days and at 8 days after 60 days and nitrogen @ 80-120 kg ha-1 gave highest seed yield of onion variety Agrifound Dark Red at Nashik. Nitrogen 80 kg ha-1 and irrigation frequency at ten days interval gave highest seed yield of onion variety Agrifound Light Red. Nitrogen 100 -120 kg ha-1 and 30 cm x 30 cm spacing recommended for highest seed yield of Agrifound Dark Red variety of onion under Sinnar, Nashik (Maharashtra) condition. Weedicide Pendimethalin @ 3.5 lit ha-1 + one hand weeding at 45 days gave good control of weeds and maximum seed yield of onion variety Agrifound Light Red under Sinnar (Nashik) condition. Organic package of FYM @ 50 t ha-1 or vermicompost @ 3 t ha-1 + Neem cake @ 1t ha-1 + T. viride @ 2500 g ha-1 before planting + Azotobactor @ 12.5g ha-1 + PSB @ 12.5 kg ha-1 + spraying of Azadirachtin @ 0.15% at 15, 30, 60 and 90 DAP + application of Yorker (Pacelomyes) @ 125 kg ha-1 at planting and spraying of T. viride at 45, 75 and 105 days after planting can be used for seed production of onion variety Agrifound Dark Red and Agrifound Light Red at Nashik. Spraying of sodium phosphate @ 50 ppm at 30, 45 and 60 days after planting of Agrifound Light Red seed crop increased seed yield by 37 % at Nashik. Use of paddy straws as mulch in seed crop with drip irrigation increases seed yield by 42 % in onion Agrifound Dark Red with higher net return.
Hydration and dehydration treatments have been recommended for increasing the germination rate in onion seed. Onion Agrifound Dark Red seed coated with DAP+ZnS04+Bavistin as well as with DAP + Borax +Trichoderma and sown in July and harvesting in November gives highest gross yield (150.0 q/ha). Priming of onion seed of variety Agrifound Dark Red with 200 ppm potassium dihydrogen orthophosphate enhanced the germination percentage upto 20 days after priming and reduced thereafter during kharif season.