JAMB Past Questions and Answers - Page 1439

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.

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.

Irrigation is an example of agricultural technology. It involves the artificial application of water to agricultural fields to supplement natural rainfall. Irrigation systems can range from simple methods like surface irrigation to more advanced techniques like drip irrigation or sprinkler systems.

The amount of nitrogen = 46/100 x 25 = 11.5kg