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  • Tapioca YTP 1 was released during 2013 with tuber yield of (49.50 t/ha) with the starch content of 25.00%. Planting material of this variety was supplied to 455 farmers covering 132 ha in Salem, Namakkal, Dharmapuri, Erode, Villupuram, Cuddalore and Nagapattinam districts of Tamil Nadu.
  • Fertigation with 75% RDF at 100% CPE recorded maximum tuber yield of 35.40 t ha-1 with a starch content of 28.50% in Co(Tp)4 tapioca variety.
  • Black Polythene mulching at the time of planting recorded 100% weed control efficiency with a tuber yield of 29.50 t ha-1 with the highest B:C of 5.7 in Co(Tp)4 tapioca variety.
  • Standardized low input technology for tapioca with Green manuring (daincha) @50kg/ha + RD of K + 50 % RD of NP + Azosprillium (5kg/ha) + Phosphobacteria (5kg/ha) which recorded maximum tuber yield (42.50 t ha-1) and starch content of 25.30%.
  • Total of 3.42 lakh numbers of Acerophagous papayae, a parasitoid of cassava mealy bug, Paracoccus marginatus were distributed to 1173 farmers, at free of cost, covering an area of 4453 acres in Salem, Namakkal, Dharmapuri, Villupuram and Trichy districts since December 2010.
  • Soil drenching of copper oxy chloride @ 2.5 g/lit on 3rd and 6th month of planting and soil application of Trichoderma viridi @ 2.5 kg/ha as basal, 3rd and 6th month of planting for the management of tuber rot in tapioca
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    i. Varieties/ Hybrids Released

    Castor Hybrid YRCH 1


    Year of release

    Yield  kg/ha

    Duration (days)

    Oil content (%)

    Traits for resistance to biotic stresses

    Recommended states

    YRCH 1


    1861 kg/ha under rainfed 3000 kg / ha Irrigated

    150 – 160 days


    Resistant to Green leaf hopper tolerant to wilt

    Tamil Nadu

  • Resistant to lodging, non shattering type, highly fertilizer responsive with semi dwarf plant ideotype. Suitable for rainfed and areas of limited irrigation potential. The plant type is compact and relatively short in stature and augurs well for intercropping system also in addition to pure cropping system. Another more important special attribute is that the time lag between any two different order of spike is less when compared to GCH 4 .Hence it produces more number of spikes per unit time and finally the total duration is also less with the duration of 150-160 days.
  • ii. Pistillate lines Developed

    Pistillate line YRCP 1

    Name of the line


    Morphological Character

    YRCP 1

    Mutant TMV 5

    R3SP ,14 Node, ,Flat leaf ,Wilt Resistant

    YRCP 2

    Mutant DPC 9

    G3SP, Very Long spike (75-80 cm), 14 Node, Flat leaf, Wilt Resistant.


    Germplasm Exploration and Collection.

  • In Collaboration with DOR, Hyderabad,exploration has been done in Salem, Namakkal, Karur,Dindigul and Erode Districts.
  • Total of 210 accessions of land races were collected.

  • Inter cropping of castor with blackgram (1: 2) in rainfed situation increased seed yield (1600 kg ha-1) and farm income with B:C ratio of 3.2 compared to sole castor cropping (1450 kg ha-1 with less B:C ratio of 1.9).
  • Seed priming with 1% KCI for 3 hours and sowing a week before onset of monsoon resulted in maximum germination percentage (85%) and better seed yield (1650 kg ha-1) in castor compared to control with less germination percentage (70%) and lesser yield (1375 kg ha-1).
  • In castor basal application of 40 kg gypsum along with foliar application of 0.5% each FeSO4 and ZnSO4 at 30 and 45 DAS produced more number of spikes per plant (14) and effective spike length (59.5 cm) and substantially higher seed yield of 2050 kg ha-1.
  • Best suited land configuration method for conserving the moisture (15% at 0-15cm depth and 13% at 16-30 cm depth) under rainfed castor cultivation in red soil is formation of tide ridges with the yield of 1902 kg ha-1. Lowest yield was recorded in flat bed (1380 kg ha-1) with least moisture conservation of 10% at 0-15 cm depth and 5% at 16-30 cm depth.
  • Castor intercropping with onion is an ideal intercropping system produced highest castor yield of 3363 kg ha-1 with 3083 kg ha-1 of onion yield, highest net return and B:C ratio of 3.53 compared to sole castor cropping (castor yield: 2829 kg ha-1with less B:C ratio of 2:1).
  • Castor seed designed with red polykote, biofertilizers and biopesticides recorded maximum germination percentage (87%), early flowering (50 days), more number of spikes per plant (16), higher 100 seed weight (27.0 g) and increased the castor seed yield by 20 % (1760 kg ha-1) with less incidence of pest and diseases and BC ratio of 3.6
  • Foliar application of plant growth regulator consortia ( Castor Gold) @ 0.05% on 25 and 50 DAS for improving pistillate flower production efficiency and seed yield (1930 kg ha-1 ) with B:C of 4.1. Control recorded the lowest seed yield of 1545 kg/ha. Castor gold is being produced at TCRS, Yethapur and readily available for sale @ Rs. 160/100ml pack for increasing the castor yield. So far 525 pack of castor gold produced and distributed to castor growers which covers 525 acres and revenue was generated for Rs. 84000/-.
  • Wider spacing of 120 x 120 cm with allowing all the order of spikes recorded more number of spikes per plant (23) and higher seed yield (2675 kg ha-1) of castor under irrigated condition. In addition to that adoption of wider spacing requires reduced seed rate and also convenient for intercultural operations.
  • Drip fertigation with recommended total quantity of 60 kg of N (Urea) and 30 kg of  K (MOP) per hectare once in 10 days applied in 9 equal splits upto 90th day along with application of 30 kg of P (Super Phosphate) per hectare as basal application recorded the highest yield of 3198 kg/ha.
  • Under rainfed castor cultivation, pre-emergence application of pendimethalin at 1.0 kg a.i. ha-1 followed by a hand weeding on 40 DAS produced higher yield (2337 kg ha-1) and B:C ratio of 3.8.

    Capsule borer, Conogethes punctiferalis (48.6 – 52.0 % Seed yield loss)

    2000 - 01
  • Spraying with decamethrin 0.003 %, monocrotophos 0.05%, fenvalerate 0.02% showed considerable reduction in capsule borer infestation of 26.0, 27.2 and 28.2 % capsule damage respectively
  • 2005 - 06
  • Spinosad 0.018 % was found to be most effective against semilooper (70 % reduction of foliage damage) and capsule borer damage (6.9 %)
  • 2006 - 07
  • Spraying with profenophos 0.05 % was found to be effective against capsule borer which recorded lowest capsule borer infestation of 1.6 % with highest seed yield of 974 kg/ha with favourable B: C ratio of 2.07.
  • Defoliators, Semilooper(Achaea janata), Tobacco caterpillar(Spodoptera litura), Hairy caterpillar (Euproctis fraterna, Ergolis merione) (31.0 – 40.8 Seed yield loss)

    2004 - 05

  • Profenophos 0.05 % , acephate 0.075 %, deltamethrin 0.003 % and monocrotophos 0.072 % effective in controlling the defoliators and reduction in foliation damage was 79 to 87 % over untreated control
  • 2008 - 09

  • Mechanical control along with monocrotophos (0.03%) spray resulted in effective control of spodoptera (0.6 Nos. / Plant) and hairy caterpillar (0.6 Nos. /plant) and increased castor seed yield of 811 kg/ha with B:C ratio of 2.7
  • Botrytis grey mold


  • Foliar spray of carbendazim (0.1%) + Wetting agents (0.5 ml/lit.) at 45 and 60 days after sowing is recommended for control of Botrytis grey mold of castor.

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Castor Gold

Caster Gold For Improving Pistillate Flower Efficiency And Yield In Castor

Castor Gold


95 %  Pistillate flower production
90%  Seed set
Increases seed yield upto 29%
Method of Application
Castor gold                 :           0.5ml /lit of water      
Wetting agent             :           1.0ml/lit of water
Stage of foliar spray    :           25 and 60 days after sowing
Sale price
50 ml   : Rs 80 /-
100 ml : Rs 160/-


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