Charlock is a weed which grows in some barley fields.
Describe how you could estimate the number of charlock plants in a field.
In barley fields, charlock plants can grow up to a height of 1.5 m and absorb large quantities of nutrients and water from the soil. Charlock has a negative effect on the growth of barley plants.
Use the information provided to explain why. In your answer, name the type of competition occurring between charlock plants and barley plants.
The table below gives some features of charlock seeds.
| Feature of seed | Value |
|---|---|
| Mean mass / mg | 1.4 |
| Maximum number produced per charlock plant during a growing season | 12,000 |
| Percentage viable (able to develop) after a growing season | 85 |
During a growing season, it was estimated that a total number of 650 charlock plants grew on the fields of a farm.
Calculate the maximum mass, in kg, of viable charlock seeds on this farm after a growing season.
Show your working. Assume that all the seeds produced during the growing season remain on the farm.
