Advisory for the month of July 2018

A.For raising kharif  onion nursery

Those who have not yet sown seeds for kharif nursery can do it now without further delay in areas where rains have already started. Following points need to be considered while preparing nursery.

1.  About 0.05 hectare nursery bed area and 5-7 kg of seeds is recommended for getting seedlings to transplant in one hectare.

2.  Deep ploughing is recommended for exposing the insect pupae and weed seeds to sunlight.

3.  The debris of previous crops, weeds and stones should be removed before bed preparation.

4.  Apply half ton of well decomposed farmyard manure in 0.05 ha.

5.  Raised bed of 10-15 cm height, 1 m width and length as per convenience need to be prepared.

6.  Application of pre-emergence herbicide pendimethalin @ 0.2 % is recommended to control weeds in nursery.

7.  Seeds should be treated with carbendazim @ 1-2 g/kg seed before sowing to avoid soil borne diseases.

8.  Application of Trichoderma viride @ 1250 g/ha is also recommended to manage damping off and raise healthy seedlings.

9.  Seeds should be sown in lines at 50 mm to 75 mm apart. After sowing, the seeds should be covered with fine powdered farmyard manure or compost followed by light watering. Drip or sprinkler irrigation is recommended.

10.  Hand weeding needs to be done 20 days after sowing.

11.  Apply 2 kg N /500 m2 after hand weeding.

12.  Foliar spray of metalaxyl @ 0.2 % is recommended to control soil borne diseases.

13.  When the severity of thrips infestation is high, foliar application of fipronil/profenophos @ 1 ml/L is recommended.

14.  Foliar application of mancozeb/ tricyclozole/ hexaconazole @ (0.1%) is recommended to control foliar diseases.

B.  Main field preparation for transplanting kharif onion

1.     Field should be ploughed and disked properly to eliminate debris and soil clods.

2.     Apply FYM 15 t/ha or poultry manure 7.5 t/ha or vermicompost 7.5 t/ha at the time of last ploughing and level the field properly prior to bed preparation.

3.     Adopt broad bed furrows (BBF) of 15 cm height and 120 cm top width with 45 cm furrow. This will help to drain the excess water through furrow and in reducing anthracnose disease.

4.     BBF method is suitable for drip and sprinkler irrigation.

5.     For drip irrigation, each BBF should have two drip laterals at (16 mm size) 60 cm with inbuilt emitters. Distance between two inbuilt emitters should be around 30-50 cm and discharge flow rate of 4 L/hr is advised.

6.     For sprinkler the distance between laterals (20 mm) of micro sprinkler should be 6 m with a discharge rate of 135 L/hr.

7.     Chemical fertilizers @ 110:40:60 kg N, P2O5, K2O per hectare need to be applied. Also apply 15 kg Sulphur/ha in soils having available Sulphur level above 25 kg/ha while 30 kg Sulphur/ha for soils having Sulphur content below 25 kg/ha. Nitrogen @ 40 kg and full dose of P2O5 and K2O and Sulphur needs to be applied at the time of planting. Remaining dose of N needs to be applied in two equal splits at 30 days and 45 days after transplanting.

8.     If onion is grown with drip system, application of 40 kg nitrogen as basal dose at the time transplanting and remaining nitrogen in six equal splits through drip irrigation should be applied up to 60 days from transplanting at 10 days interval.

9.     Biofertilizers @ 5 kg/ha each Azospirillum and phosphorus solubilizing bacteria are recommended along with inorganic fertilizers as basal dose.

10.   Apply oxyflurofen @ 23.5% EC (1.5 -2.0 ml/L)/ pendimethalin @ 30% EC (3.5-4ml/L) before transplanting or at the time of transplanting.

11.   Seedlings of 35-40 days old should be transplanted at a spacing of 15 ×10 cm (15 cm between the rows and 10 cm between plants).

12.   Proper care should be taken while selecting seedlings for transplanting. Over and under aged seedlings should be avoided. Top 1/3 of seedlings should be cut before transplanting.

13.   The onion seedling should be transplanted after dipping roots in carbendazim solution (0.10 %) to reduce the incidence of fungal diseases.

14.   Irrigation at the time of transplanting and three days after transplanting is advised for good establishment.

15.   If there is a continuous rainfall, the excess water should be drained out properly to avoid anthracnose incidence.

C. For stored rabi onion and garlic bulbs

1.  Monitor stored bulbs regularly for sprouting and rotting. Rotten and bruised bulbs, if any, should be removed immediately Make sure that ventilation is proper. 

2.    Onion bulbs should be spread properly with heap height up to 4-5 feet only.

3.    Garlic bulbs with leaves should be stored in ventilated storage structure by hanging or in circular heaps tapering towards top.

Note: Profenophos and fipronil are recommended only when the thrips damage is visible. Metalaxyl, mancozeb, hexaconazole and tricyclozole are recommended only when the disease incidence is visible.