Applications In Agricultural And Horticultural Crops

By TamilNadu Agricultural University on 29 Dec 2018 | read
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GROWTH REGULATORS IN AGRICULTURAL CROPS

Crop

Chemical/ Dosage

Response

Rice

Kinetin, GA3 and Triacontanol 
(1000 ppm)

Grain filling and partitioning. Delayed senescence

Cotton

IAA, NAA (30 ppm), CCC (cycocel)

Increase grain yield 
Decrease boll shedding 
Increase photosynthetic rate and yield
Increase number of bolls, boll weight and lint yield

Sunflower

Benzyl adenine (BA) (250 ppm) GA+BA(150ppm)

Increase yield and Achenes weight and number

Groundnut

Mepiquat chloride (125 ppm)
(2,3,4-D-chlorophynoxy triethyl amine)

Increased grain yield and chlorophyll synthesis and decrease chlorophyllase activity
Stimulation of assimilate transport in germination

Sugarcane

Ethephon

Glyphosine

Reduced growth rate and regulate ripening

Tapioca

Ethrel (250 ppm)
CCC (1000 ppm)

Early tuberisation 
Increase the weight of storage roots

Pigeonpea

Ethrel (40 ppm) and GA3 (20 ppm)
CCC(0.64 mM)

Increase grain yield
Respond well for RWC, chlorophyll and stomatal conductance

Carrot and Potato

GA3 (50 ppm)

 Induction of flowering in long day and seed setting

PLANT GROWTH REGULATORS IN RIPENING OF FRUITS

Crop

Chemical

Dose

Response

Mango
Ethephon
1000 ppm
Accelerated fruit ripening and improves surface colour
Citrus
Ethrel
1000 ppm
Induce yellow colour with in seven days
Banana
Ethrel
1000 ppm
Accelerated ripening by two days
Papaya
Ethephon + NaOH
2000 ppm
Ripening within 24 hours
Sapota
Ethephon + NaOH
500 ppm
Ripening within two days

PLANT GROWTH REGULATORS IN FLOWERING AND FRUIT SET

CropChemicalDoseTime of spray and number of sprayResponse

Coconut

2,4-D

30 ppm

One month after opening of spathe, through micro sprayer

Fruit setting percentage increased to 32.5% against 23% in control

Banana

2,4-D

25 ppm

Within a week after opening of last bud

Prevents seediness in poovan

Mandarin orange

2,4-D or NAA

20 ppm, 100 ppm

Spray at flowering.

Increase fruit set

Thompson seedless

GA3

25 ppm

Dip cluster at calyptra falling stage

Increase fruit set

Pine –apple

Planofix 10 ppm +2% urea 0.04% sodium carbonate +20 ppm ethrel

50 ml/plant applied in to the crown
200 to 300 ppm

At 35-40 leaf stage
Sprayed during fruiting

Induced uniform flowering to increase the fruit size

Snake gourd
Bitter gourd
Bottle gourd

Ethrel

100ppm

4 times 10 –15 days after sowing at weekly intervals

Increase in yield

Ribbed gourd
Pumpkin

Ethrel

250ppm

4 times 10-15 days after sowing at weekly intervals

Increase in yield

Sweet potato 

Ethrel

250ppm

At fortnight interval from 15 days after planting 

Increased tuber yield

Note
1% - 1 gram dissolved in 100ml (made up to 100 ml)
1ppm – 1 mg dissolved in 1 litre (made up to 1 lit.)

 

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