BAP-002 Basic Horticulture Study Guide to Horticulture: Importance, Scope, and Constraints

Definition and Branches of Horticulture

The term 'Horticulture' is derived from two Latin words: 'Hortus', meaning garden, and 'cultura', meaning cultivation. Traditionally, it refers to the science and art of gardening for cultivating fruits, vegetables, flowers, and ornamental plants. In the modern context, horticulture has evolved into an industry that encompasses the processing and value addition of products for both export and domestic markets. It is a critical segment of the agriculture sector, contributing approximately one-fifth of the economy within agriculture and allied sectors.

The field is divided into several major branches:

• Fruit Science: This branch deals with the cultivation of fruits and the management of orchards.

• Vegetable Science: This pertains to the production technology of vegetable crops.

• Floriculture and Landscaping: This is defined as the art and science of growing flowers and ornamental plants for commercial and aesthetic purposes. It includes landscaping, where land is developed for recreational use.

• Post Harvest Technology (PHT): This deals with the processing of various horticultural products for specific uses after harvesting.

• Spices and Medicinal Plants/Plantation Crops: This branch focuses on crops like cardamom, ginger, and turmeric (spices); ashwagandha and lemon grass (medicinal); and tea or coffee (plantation crops).

Additionally, there are specialized sub-branches:

• Arboriculture: The study of selection, planting, care, and removal of individual trees, shrubs, and perennial woody plants for human welfare.

• Landscape architecture: The production, maintenance, and marketing of landscape plants.

• Viticulture: Specifically deals with the cultivation and marketing of grapes.

• Post Harvest Physiology: Focuses on maintaining the quality and preventing the spoilage of horticultural products.

Status and Scope of Horticulture in India

India is a global leader in horticulture, ranking second in the world for fruit and vegetable production, behind China. The country produces an annual output of approximately $32\,\text{MT}$ out of a global total of $370\,\text{MT}$. During the $2016-17$ period, the production of horticulture crops reached about $295.2\,\text{million tonnes}$ from an area of $24.9\,\text{million hectares}$.

India accounts for about $10\%$ of the world’s total fruit production. While worldwide citrus fruits constitute nearly $20\%$ of production, major Indian fruits include mango, banana, citrus, apple, guava, papaya, pineapple, and grapes. The fruit production growth rate in India stands at $3.9\%$, while the processing sector has grown by approximately $20\%$ per annum. Higher growth is seen in specialized sectors, such as frozen fruits and vegetables ($121\%$) and dehydrated products ($24\%$). There are over $4,000$ processing units in India with a capacity exceeding $12\,\text{lakh MT}$, though this represents less than $4\%$ of the total production.

In the vegetable sector, India contributes $15\%$ of world production. The area under vegetable cultivation is approximately $6.2\,\text{million hectares}$, representing $3\%$ of the total cultivated area. Five major vegetables—potato, tomato, onion, cabbage, and cauliflower—account for $60\%$ of the total vegetable production in the country. Export zones in Maharashtra and Uttar Pradesh facilitate the shipment of Alphanso mangoes, Dusheri mangoes, grapes, pomegranates, and apples to Gulf and European markets, supported by the Agricultural and Processed Food Products Export Development Authority (APEDA) and the National Horticulture Board (NHB).

Nutritional Importance of Horticultural Crops

Horticultural crops are essential for nutritional security, providing vitamins, minerals, and dietary fiber. The Indian Council of Medical Research recommends a minimum per capita daily requirement of $85\,g$ of fruits and $180\,g$ of vegetables; however, actual fruit availability in India is only $40-45\,g$ per capita.

Nutrient specifics of various fruits (per $100\,g$ edible part):

• Vitamin A: Mango ($4800\,\text{IU}$), Papaya ($2020\,\text{IU}$).

• Vitamin C: Aonla ($600\,mg$).

• Thiamin: Walnut ($0.45\,mg$).

• Riboflavin: Almond ($0.57\,mg$).

• Minerals: Litchi ($0.21\,mg$ Calcium), Persian date ($10.6\,mg$ Iron).

• Macronutrients: Cashew nut ($46.9\,g$ Fat, $21.2\,g$ Protein), Banana ($36.4\,g$ Carbohydrate).

Nutritional value of common vegetables per serving (representative values):

• Asparagus (3 med. spears): $1.0\,g$ Fiber, $1.0\,g$ Protein, $2.0\,g$ Carbohydrates.

• Carrot (1 med.): $2.0\,g$ Fiber, $6.0\,g$ Carbohydrates, $21\,mg$ Sodium.

• Spinach (1 bunch): $9.0\,g$ Fiber, $9.5\,g$ Protein, $12\,g$ Carbohydrates.

• Tomato (1 med.): $0.5\,g$ Fat, $1.5\,g$ Fiber, $5.5\,g$ Carbohydrates.

Processing and Dehydration Technology

Fruit and vegetable processing transforms perishable produce into shelf-stable products. Dehydration is a primary method that removes water by evaporation under controlled heat to reduce weight, inhibit microbial growth, and lower transportation costs. Proper dehydration requires sufficient heat, dry air to absorb moisture, and adequate air circulation.

Steps in the dehydration process:

1. Washing (Potable water)

2. Peeling (Stainless steel knife)

3. Preparation and Blanching (Vegetables: dip in water for $5-10\,\text{minutes}$ at $80-90^{\circ}\text{C}$)

4. Spreading on flat trays

5. Sulphitation: Vegetables use $1-2\%$ KMS solution for $10-15\,\text{minutes}$; Fruits are exposed to sulfur fumes.

6. Drying/Dehydration: Fruits ($8-10\,\text{hours}$ at $60-70^{\circ}\text{C}$); Vegetables ($6-8\,\text{hours}$ at $68-72^{\circ}\text{C}$).

7. Sweating, Packing, and Storage.

Minimal processing refers to fresh-cut products (trimmed, peeled, washed) that remain in a fresh state. This increases convenience but also increases perishability; the shelf life is typically $7-8\,\text{days}$ for fruits and $10-14\,\text{days}$ for vegetables. Cold chain maintenance between $1-5^{\circ}\text{C}$ is mandatory for these products.

Floriculture and Value Addition in Floral Crops

Floriculture in India ranks second globally after China. The industry has seen significant growth, with the area under cultivation increasing from $53,000\,ha$ in $1993-94$ to $258,000\,ha$ during $2017-18$. Traditional flowers (marigold, jasmine, rose) account for over $50\%$ of domestic trade ($Rs. 300\,\text{crores}$), while cut flowers (gladiolus, carnation, gerbera) are grown for bouquets and export.

Techniques for processing floral crops:

• Essential Oil Isolation: Extracted via hydro-distillation, steam distillation, or volatile solvents.

• Hydro-distillation: Floral material is in direct contact with boiling water; used for superior quality.

• Steam distillation: Faster process where material contacts steam only on a grid; suited for high boiling point constituents.

• Concrete: An extract of fresh plant parts using hydrocarbon solvents like hexane; a waxy semi-solid.

• Absolute: A concentrated alcohol-volatile concentrate obtained by removing waxes from concrete using ethanol and vacuum distillation.

• Effleurage: Extraction of perfume oils using cold fats and non-volatile solvents; produces products of the highest purity.

• Gulkand: A rose petal conserve made by mixing equal parts petals and sugar and maturing them in the sun for a month.

Constraints and Shortcomings in Horticulture

Despite high production, the sector faces significant hurdles. Post-harvest losses are estimated at $Rs. 23,000\,\text{crores}$ annually, with some estimates citing up to $Rs. 50,000\,\text{crore}$ due to technical management failures. Approximately $30-40\%$ of total production is lost due to spoilage.

Major problems include:

• Low Productivity: Use of inferior/indifferent varieties and poor quality planting materials.

• Management Gaps: Haphazard orchard layouts, weed infestation, and lack of disease diagnostic appliances.

• Infrastructure Deficiencies: Lack of cold chain management, inadequate transportation, and poor sorting/grading facilities.

• Financial/Market Constraints: Domination by middlemen, high interest rates for export finance (roughly $10\%$ in India vs. $4\%$ internationally), and small-scale land holdings.

• Logistic Challenges: High transportation costs and poor market intelligence.

Hill Horticulture presents unique constraints:

• Undulating topography and fragmented land holdings ($63.8\%$ of families in HP have less than $1\,ha$).

• Soil erosion on slopes and periodic water stress.

• Inaccessibility and physical obstructions to mobility.

• Damage from wild animals (monkeys, wild pigs).

Development Strategies and Institutional Support

The Indian government utilizes a "Mission Mode" approach through the Technology Mission for Integrated Development of Horticulture. Key strategies include:

• Mini Mission I: Managed by ICAR; focuses on technology support, supply of nucleus/basic seeds, and technology refinement.

• Mini Mission II: Managed by the Department of Agriculture & Cooperation; focuses on area expansion, water management, and organic farming.

• HRD (Human Resource Development): Facilitated by Krishi Vigyan Kendras (KVK), agricultural universities, and advanced training centers to enhance the skills of extension staff and farmers.

• ATIC (Agriculture Technology Information Centre): Provides a single-window system for farmers to access technical information, quality planting materials, and diagnostic services.

• NHB (National Horticulture Board): Provides financial assistance (up to $Rs. 10\,\text{lakh}$ per project) for introducing new technologies like tissue culture propagation.

• APEDA: Promotes export-related infrastructure, including cold storage and cargo handling at major airports like New Delhi, Mumbai, and Bangalore.