Module 5: Agricultural Inputs: Seeds, Fertilizer & Agrochemicals
- Distinguish improved/certified seed from recycled grain seed
- Explain the roles of the three primary fertilizer nutrients (N-P-K)
- Describe safe, responsible use of agrochemicals
Certified or improved seed varieties are bred and tested for higher yield, disease resistance, or drought tolerance, and consistently outperform grain saved from a previous harvest, which can carry disease and inconsistent genetics. Fertilizers are commonly labeled by their N-P-K ratio: nitrogen (N) drives leafy green growth, phosphorus (P) supports root and flower development, and potassium (K) strengthens overall plant health and disease resistance. Agrochemicals such as pesticides and herbicides can protect yield from pests and weeds, but overuse or incorrect application damages soil microbiology, harms beneficial insects like pollinators, and can leave unsafe residue on food, so label instructions on dosage and pre-harvest intervals must be followed closely.
1. Compared to seed saved from a previous harvest, certified/improved seed generally offers:
2. On a fertilizer label, the 'N' in an N-P-K ratio stands for the nutrient that mainly supports:
3. Why must agrochemical label instructions on dosage and timing be followed closely?