What problem can result from the same crop being grown in a field for too long without a break?
What problem can be caused by the weight of heavy machinery on the ground?
Name the chewing larval form of many insects
What horticultural farming practice can cause air pollution?
Cultivating crops with bare soil between rows can lead to what problem?
Loud machinery such as chainsaws, mowers and tractors create what type of pollution?
Who monitors the use of water and sets limits on how much can be used and by whom?
What builds up in waterways when nutrient levels get unbalanced by fertiliser run-off?
What problem can a heat dragon be used to help prevent?
What compete with the plants for soil nutrients?