JAMB Agricultural Science Past Questions & Answers - Page 15

Crop rotation does not add humus to the soil.

Soil fertility is influenced by a variety of factors including organic matter content, nutrient availability, pH, soil structure, soil texture, and drainage. Organic matter content and nutrient availability provide the necessary nutrients for plant growth. pH affects the availability of nutrients in the soil. Soil structure affects the soil's ability to hold and supply water, air, and nutrients to plants. Soil texture affects the soil's physical properties and its ability to hold and supply water, air, and nutrients to plants. Drainage affects the soil's ability to supply sufficient water to plants without waterlogging the roots.

Biotic factors in an agricultural ecosystem refer to the living organisms or biological components that influence the dynamics of the ecosystem. These factors can include plants, animals, microorganisms, and other living organisms that interact with agricultural crops. Crop pests, such as insects, rodents, and pathogens, are examples of biotic factors that can have a significant impact on agricultural systems.

Fertile soil is one which contains all the plant nutrients in the right proportion.
A fertile soil will contain all the major nutrients for basic plant nutrition (e.g nitrogen, phosphorus and potassium), as well as other nutrients needed in smaller quantities (e.g calcium, magnesium, sulfur, ion e.t.c).

Pollination is the process by which pollen grains are transferred from the male reproductive organs to the female reproductive organs of a plant, enabling fertilization and seed production. Various agents can facilitate pollination, including animals, wind, and water.