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Plant Nutrition :: Plant Growth Regulators |
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APPLICATIONS IN AGRICULTURAL AND HORTICULTURAL CROPS
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
Crop |
Chemical |
Dose |
Time of spray and number of spray |
Response |
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 |
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Note:
1% - 1 gram dissolved in 100ml (made up to 100 ml)
1ppm – 1 mg dissolved in 1 litre (made up to 1 lit.)
Source: Dr. P.Jeyakumar, Associate Professor (Crop Physiology), Dept. of Fruit Crops, HC & RI, TNAU, CBE.
Related Links
http://www.ikisan.com/links/ap_regulators.shtml
http://en.wikipedia.org/wiki/Plant_hormone |
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