External Factors of Tree Growth (Environmental Factors): These are outside the plant’s control and come from the environment: Light (Sunlight Intensity & Duration): Essential for photosynthesis. Affects leaf size, orientation, and growth rate. Insufficient light causes spindly, weak growth. Temperature: Influences enzymatic activities and metabolic rate. Extremely high or low temperatures can slow or stop growth. Water Availability: Crucial for nutrient transport, photosynthesis, and turgor pressure. Drought limits growth, while excess water can cause root rot. Soil Conditions: pH, texture, structure, and organic matter affect root development and nutrient uptake. Poor soil can restrict root growth and anchorage. Nutrient Availability: Macronutrients (N, P, K) and micronutrients (Zn, Fe, Mg, etc.) are essential. Deficiencies can cause stunted growth and chlorosis. Air Quality & CO₂ Concentration: Clean air and sufficient CO₂ enhance photosynthesis. Pollution or smog can damage leaves. Wind: Mild wind strengthens trunk and branches. Strong winds can break limbs or uproot trees. Biotic Factors: Pests, diseases, herbivores, competition from other plants can hinder growth. 🌱 Internal Factors of Tree Growth (Physiological Factors): These are controlled by the tree’s own genetic and biochemical processes: Genetic Makeup (Species/Variety): Determines potential height, growth rate, leaf shape, lifespan, etc. Plant Hormones (Phytohormones): Auxins: Promote stem elongation and root initiation. Gibberellins: Stimulate cell elongation, seed germination. Cytokinins: Promote cell division and delay aging. Abscisic Acid (ABA): Induces dormancy and stress resistance. Ethylene: Involved in fruit ripening and leaf abscission. Apical Dominance: The tip of the tree inhibits growth of lower branches through hormonal control (auxins). Rate of Cell Division & Elongation: Controlled by DNA and hormones, determines how fast a tree grows. Dormancy & Seasonal Rhythms: Many trees enter dormancy in unfavorable seasons, guided by internal cues. Age of the Tree: Young trees grow faster; growth slows as the tree matures.

A small village in Nachol Upazila of Chapainawabganj district is called Tikil ((Tikoil). And every wall of Tikil village is like an open canvas. On that canvas, the people of Tikil village brought out all the beautiful Alpana. Hence the village became known as Alpana Village (The Alpona Village/A Village of Alpona) to numerous people from home and abroad. Alpanas are mainly drawn by village housewives and girls. They have been cherishing their tradition on the walls of the house for years. In mud houses, alpana are painted with their own paint and the main raw material for painting alpana comes from the soil.