• Botanical Name: Saccharum officinarum
• Family: Poaceae
• Chromosome Number: 2n = 80
• Origin: Southeast Asia (India, New Guinea)
• Inflorescence: Open panicle
• Seed: Caryopsis (but primarily propagated vegetatively via setts)
• Test Weight: 70-80 grams (varies depending on variety)
• Fruit Type: Caryopsis
• Photosynthetic Pathway: C4
• Length Requirement: Long-day plant (some varieties are day-neutral)
• Growth Temperature: 25–30°C (optimal for growth and sucrose accumulation)
• Moisture Requirement: 77-88% field capacity during growth stages
• Tillering: Optimal in high moisture and heat conditions, with ideal sunlight for photosynthesis
• Sucrose Content: 13-24% (varies depending on variety and growth conditions)
• Plant Height: 2-4 meters (depending on variety)
• Maturity Duration: 12-18 months (from planting to harvest)
• Propagation Method: Primarily vegetative through setts (cut pieces of the stalk with buds)
• Harvesting Time: Can be accelerated using chemical ripeners (e.g., Balsario, Polaris, sodium metasilicate)

Sugarcane Varieties:

Sugarcane is mainly classified into tropical and Indian varieties, each with specific characteristics suited to the environment in which they are grown:

• Tropical Cane (Saccharum officinarum): Indigenous to New Guinea, this variety is known for its thick and juicy canes, which are high in sugar content and low in fiber. It is ideal for chewing purposes and is mainly grown in tropical regions.
• Indian Canes: These include Saccharum barberi and Saccharum sinense, which are native to northeastern India. They tend to have thinner stalks, early maturity, and moderate sucrose content. These varieties are better suited to the Indian climate and soil types.

Root Systems:

• Sett roots are temporary roots that develop during the early stages of growth.
• Shoot roots are permanent roots that provide anchorage to the plant, playing a critical role in nutrient absorption and stability, especially as the plant grows taller.

Sugarcane Inflorescence: The open panicle or “arrow” is the sugarcane’s inflorescence. This part of the plant is important for propagation, although sugarcane is primarily propagated vegetatively through setts.

Global Sugarcane Production: Brazil has been the leader in sugarcane production since 1979, surpassing countries like India, Cuba, and China. Brazil’s advanced agricultural technologies, including the use of sugarcane for ethanol production (gasohol), give it an edge in both sugar production and biofuel manufacturing.

Sugarcane as a Source of Sugar and Bioenergy:

• Sugarcane is a versatile crop, used to produce white sugar, jaggery, and alcohol. About 50% of sugarcane is processed into white sugar, 30% into jaggery (low-purity sugar), and the remaining 20% is used for alcohol production, which is an important source of bioenergy, especially in countries like Brazil.
• In Brazil, sugarcane is used to produce gasohol, a fuel blend of 80% petrol and 20% ethanol from sugarcane, which has been instrumental in reducing petroleum consumption.

Sugarcane Breeding and Research Institutions:

• Sugarcane Breeding Institute (SBI) in Coimbatore, Indian Institute of Sugarcane Research (IISR) in Lucknow, and the Indian Sugar Institute (ISI) in Kanpur are the key institutions that focus on improving sugarcane varieties and cultivation practices in India. These institutes focus on developing disease-resistant varieties, improving sugar content, and researching better agronomic practices.

Optimum Conditions for Tillering:

Sugarcane requires specific environmental conditions for optimal growth, particularly during the tillering phase:

• High Heat Requirement: 25–30°C temperature range is ideal for growth.
• High Moisture Requirement: The crop needs 77–88% field moisture capacity, which is essential for robust tillering.
• Good Illumination: Bright sunlight promotes photosynthesis and, subsequently, growth. Water availability is equally crucial to support optimal tillering.

Cultivation Phases:

The growth of sugarcane is divided into four key phases:

• Germination Phase (up to 60 DAP): The early stage when the cane begins to sprout and establish itself.
• Formative Stage (60–130 DAP): During this period, water requirements are highest, especially in northern India, where irrigation is crucial.
• Grand Phase (130–250 DAP): This phase focuses on the growth and development of the plant.
• Maturing Phase (250–365 DAP): The plant matures, and the sucrose content increases, making it ready for harvest.

Methods of Planting:

There are several methods of planting sugarcane, each suited to different soil types and environmental conditions:

• Flat Bed Planting: Shallow furrows are used, and setts are placed in rows. It is popular in regions with moderate rainfall, such as North India and parts of Maharashtra.
• Furrow Method: Deep furrows are dug, particularly in heavier soils found in the south of India.
• Trench/Java Method: This method is beneficial in regions with strong winds, such as coastal areas. The cane is planted in deep trenches, which provide support to tall canes.
• Partha Method: Designed for waterlogged conditions in South Tamil Nadu, where setts are planted at a 45° angle on ridges to prevent rotting.
• Spaced Transplanting Technique: This involves planting single budded setts in nurseries and transplanting them into the main field after 45–60 days.
• Winter Nursery System: A method of growing setts in a nursery during winter to promote sprouting before transplanting them into the main field.
• Rayungan and Tjeblock Methods: These methods involve sprouting buds and transplanting them into the field, ensuring energy and nutrient supply to the buds for successful growth.

Placing of Setts:

Different techniques for placing setts include:

• End to End Method: Setts are planted in a straight line, and this method uses fewer setts.
• Eye to Eye Method: This method involves a more systematic placement of setts.
• Double Row System: Used for thicker planting and for off-season planting, helping maximize space and yield.
• Single Bud Planting: Involves planting only single-budded setts, which helps in improving the germination rate and reducing crop competition.

Sugarcane Yield and Production in India:

• Maharashtra has the highest sugar yield per hectare (10.04 tonnes/ha), followed by Tamil Nadu (9.04 tonnes/ha). These states benefit from efficient irrigation systems, advanced farming practices, and good climatic conditions for sugarcane cultivation.

Sugarcane Harvesting:

For proper maturity, Balsario chemical is sprayed at a rate of 4.5 kg/ha in 1000 liters of water. This chemical accelerates maturity by 6-8 weeks, allowing for earlier harvesting. Other chemical ripeners like Polaris and sodium metasilicate can also be sprayed on the foliage about 6 weeks before harvest to improve the sucrose content in the juice.

Symptoms for Judging Sugarcane Maturity:

To determine the right time for sugarcane harvest, the following symptoms are key:

• Leaf Yellowing and Cane Brittleness: The leaves start yellowing, and the canes become brittle and break easily at the nodes.
• Swelling of Buds: Buds at the nodes swell, and some may even begin sprouting.
• Brix Measurement: The Brix% reading taken from the middle portion of the cane should reach 16-18% to indicate maturity.
• Glucose Content: A glucose content of less than 0.5%, measured by Fehling’s solution, also signals that the sugarcane is ready for harvest.

High temperatures can lead to the conversion of sucrose into glucose, which lowers the quality of the produce.

Comparison between Sugarcane and Sugar Beet:

• Sugar Extraction Process: Sugarbeet is extracted using the diffusion process.
• Contribution to World Sugar: Sugarbeet accounts for 40% of the world’s sugar production, while sugarcane supplies the remaining portion.

Sugarcane Recovery and Byproducts:

Juice Extraction:

• Ordinary Crusher: 50-65% juice extraction.
• Power Crusher: 60-70% juice extraction.
• Vacuum Crusher: 70-75% juice extraction.

Byproducts:

• Jaggery/Gur: From the juice, 9-10% can be converted into jaggery (with a maximum recovery of 15-18%).
• Crystallized Sugar from Gur: About 62.5% of jaggery can be processed into crystallized sugar.
• Sucrose Content: The sucrose content in sugarcane ranges from 13-24%, depending on the variety and growth conditions.
• Sugar Recovery: 6-10% of the juice can be processed into sugar.
• Molasses: Around 3.5% of the juice turns into molasses.
• Rab: 18-20% of the juice is used for making rab, a thick sugar syrup.