Tropical and subtropical vegetables (2+1)

Use of growth regulators and chemicals

• Use of plant growth regulators in tomato has been found beneficial for earliness, yield, quality, cold and high temperature, and fruit setting and to develop resistance to TLCV (Tomato Leaf Curl Virus). Growth regulators activate the root growth, increase fruit set and yield. They also affect the physiological process hasten maturity and better quality of fruits.

Various growth regulator substances recommended for various purpose are summarized in the table

Chemicals	Common name	Doses(mg/litre)	Effective
2,Chloroethyl phosponic acid	Ethephon	200-500 whole plant spray	Flowering induction, better rooting and setting of plants
2,Chloroethyl trimethyl ammonium chloride	cycocel	500-100	Flower bud, stimulate pigment formation and increase fruit set
2,4 Dichlorophenoxy acetic acid	2,4-D	2-5 seed treat whole plant spray	Increase fruit set, earliness and parthenocarpy
3 Indole butyric acid	IBA	50-100	Increase fruit set
3 Indole acetic acid	IAA	Foliage spray	Increase fruit size and yield
Naphalene acetic acid	NAA	Spray oil	Higher fruit set, yield
Parachlorophenoxy acetic acid	PCPA	50 foliar spray	Higher fruit set under adverse climatic condition
6-4Hydroxy methyl 8 methyl gibberlin	GA	50-100 foliar spray	Elongate shoot growth and increase fruit yield