Monthly circular – April 2014
Monthly Circular April -2014
Weather data recorded in March 2014 at the TRF observatory are given below, along with the
corresponding figures for March 2013.
|Year||Total Rainfall mm||Mean Sunshine hr/day||Mean Temperature ° C||Mean
Relative Humidity % at
|Mean Evaporation mm/day||Mean Wind speed km/hr|
Nursery: Planting of cuttings in nursery may be started during this month.
Plucking: Addition of mother leaf by hand plucking is to be discontinued after the receipt of sufficient (2 to 3 inches over a period of seven to ten days) pre monsoon showers. Late second, third and fourth year fields may be brought under shear harvesting during the month.
Pruning: Pruning may be started during this month after the receipt of sufficient rainfall. The entire pruning operation can be completed within 20 days if pruning machines are used.
Liming: Based on soil pH, rainfall, yield level and length of pruning cycle, dolomitic lime may be applied to the fields earmarked for pruning. There should be a minimum of 6 weeks interval and 15 cm rainfall between liming and NK application and vice versa.
Fertilizer application: One split of sulphate of ammonia based NK mixture may be broadcasted immediately after receiving sufficient rainfall. In the pruned year, N:K2O ratio may be maintained as per pruning height whereas 2:1 ratio may be followed in other years of the pruning cycle. If sulphate of ammonia is not available, urea may be applied at 4:3 – N: K2O ratio. Adequate soil moisture is to be ensured for urea application.
Soil application of phosphorus: For low and medium yielding fields, 300 g of citric acid may be mixed with 15kg of P2O5 per ha (83 kg of rock phosphate) and for high yielding fields 500 g of citric acid may be mixed with 20 kg of P2O5 (110 kg of rock phosphate) and applied along with the first split NK by broadcasting. To ensure proper mixing, five kg of rock phosphate may be first mixed with 300 g of citric acid, and this mixture may be thoroughly mixed with the entire quantity of rock phosphate and then with the entire quantity of NK before broadcasting.
Foliar application of zinc, magnesium, manganese, boron and NAA: One round of foliar application of two kg each of zinc sulphate and magnesium sulphate (1% concentration) along with 308 g of manganese sulphate, 114 g of boric acid and 45 ml of Planofix/Agronaa in 200 litres of water per hectare may be given after receiving sufficient rainfall.
Foliar application of PGRs: One round of foliar application of Biozyme/Cytozyme @ 200 ml in 200 litres of water during the third or fourth week of April could be beneficial. Straight application is suggested. Alternatively, Kadostim @ 300 ml in 200 litres of water per ha is recommended. It is compatible with micronutrients.
Pest control: Mild to moderate infestation of red spider mites has been observed in the district. RSM infested fields may be sprayed with any one of the following recommended chemicals. 1. Propargite 57 EC @ 500 ml/ha 2. Fenpyroximate 5 EC/SC @ 300 ml/ha, 3. Hexythiazox 5.45 EC @ 400ml/ha. 4. Spiromesifen 240 SC @ 300 ml/ha 5. Lime sulphur – Polysulphide-S content 13-15 % @ 1:40, 10-12 % @ 1:30; 7- 9 % @ 1:25 and < 7 % @ 1:20 6. Paraffinic Oil @1500 ml/ha
Mild infestation of Tea mosquito and moderate incidence of thrips has also been noticed in many estates. To contain these pests, immediate spraying should be done after plucking with any one of the following insecticides like Thiamethoxam 25 WDG @100g/ha, or Quinalphos 25 EC @ 1000ml/ha. Spraying of synthetic pyrethroids should be avoided during this month.
Shot hole borer infested fields, which are due for pruning in April 2014, may be sprayed with any one of the following insecticides immediately after pruning to prevent the migration of the beetles to adjacent fields. 1. Deltamethrin 2.8 EC @ 500 ml/ha. 2. Quinalphos 25 EC @ 1000 ml/ha. A spray volume of 675 litres of water per hectare is recommended, if hand operated knapsack sprayers are used. The volume of spray fluid could be reduced to 400 litres per hectare, if power sprayers are used. The branches which are very badly affected by shot hole borer may be cut to sound wood by selective surgery by well trained workers.
Mid-cycle chemical spraying against shot hole borer has to be carried out during the month of April in third year fields having more than 15% infestation. Any one of the above mentioned insecticides may be sprayed.
Weed control: Wherever growth of weeds is noticed spot spraying of ammonium salt of glyphosate (Excel Mera 71 SG) @ 3g/L of water is recommended.
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