Agriculture and Nutrient Cycles Chapter 2.7

Agriculture and Nutrient Cycles The seeds, leaves, flowers and fruits of plants all contain valuable nutrients. As crops are harvested, the valuable nutrients are removed from the soil. This diversion of nitrates and phosphate from the local cycles would soon deplete the soil unless the farmer replaced the missing nutrients.

There are many other elements/nutrients that plants need, other than carbon. Plants also need nitrogen (N), phosphorus (P), and potassium (K) As plants grow, they remove these nutrients from the soil. FERTILIZERSFERTILIZERS are materials used to restore soil nutrients and increase production from land.

However, adding too much fertilizer is not always better. Extra, unused fertilizer can end up in streams and lakes.

Questions Answer questions Page 71 #2,4,5

PESTICIDES CHAPTER 2.2 ( Case Study ) Scan figure 4

THINGS TO DO: Read Chapter 2.2 Page Fill in the worksheet 40 MINUTES TO COMPLETE Check answers before the end of class