Fundamentals of Horticulture-part-6

Fundamentals of Horticulture (PART-6)

Kinds of Flower Bearing Shoot

Classifications of Fruit Trees

Fruit trees can be classified based on the formation of flower buds and the characteristics of their flowering shoots. Understanding these classifications is crucial for effective horticultural practices, including pruning and maintaining fruit production.

Flowering Types:

  1. Terminal Flowering (at the tip of the shoot):

    • Flowers produced on terminal buds.

    • Can lead to fruiting without the development of leaves in certain species.

    • Examples:

      • Mango: bears flowers only at the terminal buds.

      • Apple, Fig, Avocado: terminal buds unfold into leafy shoots, with flowers potentially growing in leaf axils.

      • Guava: characteristic of opening into leafy shoots with flowers appearing in leaf axils.

  2. Lateral Flowering (along the sides of the shoot):

    • Flowers arise from lateral buds, which can influence the overall shape and growth pattern of the tree.

    • Examples:

      • Citrus (like Orange or Limon), Coconut: produce flowers from lateral buds without leaves.

      • Grapes: have lateral buds that create leafy shoots terminating in clusters of flowers.

      • Litchi: fruits develop from the sides of the lateral shoots.

  3. Mixed Buds:

    • Fruit Buds: located at the tips; only produce flowers (e.g., Walnut).

    • Adventitious Buds: arise irregularly on older trunks, leading to unique growth patterns (e.g., Jackfruit).

Continuation of Classification

This section provides detailed examples and explanations for Groups 6 to 8, showcasing how diverse fruit tree classifications can be and their implications on horticultural practices.

Examples of Fruit Crops

The following fruits are significant in horticulture and agriculture:

  • Mango

  • Apple

  • Fig

  • Avocado

  • Guava

  • Citrus (Limon)

  • Coconut

  • Coffee

  • Grapes

  • Papaya

  • Litchi

Pruning in Fruit Tree Management

Importance of Pruning:

Regular pruning is essential as it enhances the health, productivity, and longevity of fruit trees. It fosters better air circulation and sunlight penetration, which are vital for fruit production and disease prevention.

Types of Pruning:

  • Pruning for Fruiting: performed during the tree's dormant stage. Timing varies:

    • Late winter for temperate trees.

    • Post-harvest for evergreen trees.

  • Structural Adjustment Pruning: executed during active growth, particularly in the summer months to shape the tree for optimal growth patterns.

Pruning Techniques

  1. Heading Back: Involves cutting the branch terminal to encourage bushier growth and to maintain a manageable size of the tree.

  2. Thinning Out: This technique entails the complete removal of some branches to improve airflow and light exposure, thus reducing the risk of disease.

Pruning Time and Techniques for Major Crops

This section includes specific crops such as Apple, Peach, Plum, Grape, Mango, Phalsa, and Ber, with associated timings and methods to ensure they thrive optimally.

Pruning Considerations

Key Points:

  • Utilize sharp, clean tools to avoid damaging the tree.

  • Make small, smooth cuts to minimize water accumulation and reduce the chances of rot.

  • Treat larger wounds with antifungal agents to prevent disease.

  • Regularly remove any deadwood and parasites to maintain tree health.

Biological and Chemical Methods for Managing Plants

Biological Control:

Utilization of rootstocks, phloem disruption, and hardening methods to promote growth and disease resistance.

Chemical Control:

Application of Plant Growth Regulators to manage rooting, modify flower sex, induce flowering, regulate fruit set, and control ripening.

Additional Techniques for Tree Management

Continuous discussion on plant regulation techniques, including crop thinning and various ripening control methods to enhance overall yield.

Top Working - Rejuvenation Technique

This innovative method improves the quality of inferior fruit varieties by grafting superior cultivars onto pruned branches. Significant crops for this technique include mango, sapota, and jackfruit.

Advantages of Top Working

  • Increases overall productivity of the orchard.

  • Allows conversion of old orchards into profitable operations.

  • Facilitates the introduction of multiple varieties, enhancing biodiversity.

  • Generates additional income by maximizing land use.

Disadvantages of Top Working

  • Risk of plant death during the grafting process.

  • Additional management requirements may increase operational complexity.

  • Potential for crop loss if the grafting fails or the new variety does not thrive.

  • Disease occurrence can impact the newly grafted plants if not managed properly.

  • Requires skilled labor for successful execution.

Training and Pruning of Fruit Plants

Overview

These horticultural management practices are aimed at ensuring both the quality and quantity of produce are improved over time.

Introduction to Training and Pruning

Essential processes that sustain the health and yield potential of fruit trees throughout their life cycle.

Definition of Training

Training involves controlling the shape, size, and direction of plant growth to align tree development with desired horticultural goals.

Objectives of Training

  • Develop a strong framework to support heavy fruit loads and promote longevity.

  • Improve the overall appearance of the tree for aesthetic value.

  • Facilitate orchard operations such as harvesting and pest management.

  • Balance growth to optimize resource use without overcrowding.

  • Enhance access to sunlight for all parts of the tree, which is crucial for photosynthesis.

Principles of Training

  • Training should begin early in the tree's development.

  • Discard inferior shoots to encourage the growth of stronger ones.

  • Promote the development of side shoots to ensure a balanced structure.

  • Training can be performed through single-stem or multi-stem systems, depending on the growth habits of the species.

Tree Structure Terminology

Definitions include:

  • Trunk: The main supporting structure of the tree.

  • Head: The uppermost part of the tree where branches emerge.

  • Scaffold Branches: Main branches that support the overall structure.

  • Crotch: The angle between the trunk and a branch.

  • Leader: The main vertical shoot extending upward.

  • Water Shoots: Fast-growing vertical shoots often seen in response to pruning.

  • Suckers: Undesirable shoots that emerge from below the graft union.

Details of Training

Training becomes essential for understanding head height, and the number and distribution of scaffold branches, which contributes to mechanical stability and overall management ease.

Methods of Training Trees

  1. Central Leader System: Preserves the main stem while allowing for proper spacing between branches to maximize sunlight exposure.

  2. Open Centre System: Promotes branching that permits greater light distribution and simplifies management tasks.

  3. Modified Leader System: Combines elements of both central leader and open centre systems to produce manageable trees designed for harvest accessibility.

Common Training Systems

  • Central Leader

  • Modified Central Leader

  • Open Vase

Special Methods of Training

  • Bush System: This technique maintains a low height, particularly used in apple cultivation to promote a bush-like shape.

  • Pyramid System: Structured with longer lower branches, creating an aesthetic and functional pyramid shape which can improve light access.

Espalier System

Utilizes horizontal branches trained along supports to manage light exposure effectively, improving fruit yield in limited spaces.

Cordon System

This method comprises a singular tree tied to supports, enhancing efficiency and boosting fruit production through improved management.

Tatura Trellis System

Introduced in 1973, this system employs wire trellises to support growth without the necessity for dwarf rootstocks, beneficial for various fruit species.

Pruning Overview

Defined as the judicious removal of specific plant parts to achieve an ideal balance of growth and productivity in fruit trees.

Objectives and Principles of Pruning

Control fruit production, remove unhealthy branches, ensure access to sunlight, and facilitate balanced growth through careful pruning strategies.

Types of Pruning

Including Frame, Maintenance, and Renewal Pruning, each serving distinct purposes to maintain plant health and productivity.

Pruning Methods

Various approaches to pruning, including:

  • Heading Back: Cutting back branches to promote denser foliage.

  • Thinning: Removing branches to enhance airflow.

  • Ringing, Notching, and Nicking: Specific techniques used for triggering responses in plant growth.

Root and Leaf Pruning

Essential for bonsai development, maintaining overall plant health, and regulating flowering in certain species.

Pruning Techniques Detailed

Proper techniques are emphasized to ensure the long-term health and productivity of fruit trees, fostering a thriving horticultural environment.