Sugarcane (Saccharum officinarum) family
Gramineae (Poaceae) is widely grown crop in India. It provides
employment to over a million people directly or indirectly besides
contributing significantly to the national exchequer.
Sugarcane growing
countries of the world lay between the latitude 36.7° north and 31.0°
south of the equator extending from tropical to subtropical zones. Sugar
cane originated in New Guinea where it has been known for thousands of
years.
Sugar cane plants spread along human migration routes to Asia and
the Indian subcontinent. Here it cross-bred with some wild sugar cane
relatives to produce the commercial sugar cane we know today.
Cultivation of sugarcane in India dates back to
the Vedic period. The earliest mention of sugarcane cultivation is found
in Indian writings of the period 1400 to 1000 B.C.
It is now widely
accepted that India is the original home of Saccharum species. Saccharum
barberi and Polynesian group of island especially New Guinea is the
centre of origin of S. officinarum. It belongs to family Gramineae
(Poaceae), class monocotyledons and order glumaceae sub family
panicoidae, tribe Andripogoneae and sub tribe saccharininea.
The
cultivated canes belong to two main groups: (a) thin, hardy north Indian
types S.barberi and S.Sinense and (b) thick, juicy noble canes
Saccharum officinarum. Highly prized cane is S. officinarum.
Climatic requirement
Temperature for different critical stages of sugarcane:
The different critical stages are germination, tillering, early growth,
active growth and elongation. Optimum temperature for sprouting
(germination) of stem cuttings is 32° to 38°c.
It slows down below 25°,
reaches plateau between 30°-34°. Temperatures above 38° reduce the rate
of photosynthesis and increase respiration. For ripening, however,
relatively low temperatures in the range of 12° to 14° are desirable.
The sugarcane productivity and juice quality are
profoundly influenced by weather conditions prevailing during the
various crop-growth sub-periods.
Sugar recovery is highest when the
weather is dry with low humidity; bright sunshine hours, cooler nights
with wide diurnal variations and very little rainfall during ripening
period. These conditions favour high sugar accumulation.
The climatic
conditions like very high temperature or very low temperature
deteriorate the juice quality and thus affecting the sugar quality.
Favourable climate like warm and humid climate favour the insect pests
and diseases, which cause much damage to the quality and yield of its
juice and finally sucrose contents.