Which of the following is not provided to the soil by a chemical fertiliser?*1 pointNitrogenHumusPotassium(d) PhosphorusBackSubmitClear form

To determine which of the options is not provided to the soil by a chemical fertilizer, we need to analyze each option individually.

1. Nitrogen: Chemical fertilizers often contain nitrogen compounds, such as ammonium nitrate or urea, which are added to the soil to provide nitrogen to plants. Therefore, nitrogen is provided to the soil by a chemical fertilizer.

2. Humus: Humus is a natural organic material that forms in soil as a result of the decomposition of plant and animal matter. Chemical fertilizers do not provide humus to the soil. Instead, humus is formed through natural processes.

3. Potassium: Chemical fertilizers commonly contain potassium compounds, such as potassium chloride or potassium sulfate, which are added to the soil to provide potassium to plants. Therefore, potassium is provided to the soil by a chemical fertilizer.

4. Phosphorus: Phosphorus is an essential nutrient for plant growth, and chemical fertilizers often contain phosphorus compounds, such as monoammonium phosphate or diammonium phosphate, which are added to the soil to provide phosphorus to plants. Therefore, phosphorus is also provided to the soil by a chemical fertilizer.

Based on the analysis, the option that is not provided to the soil by a chemical fertilizer is humus.