Answer to Question 1
The plant organic matter that is not decomposed between the turfgrass and the soil
surface is called thatch. Thatch is caused by an accumulation of excess grass stems,
stolons, rhizomes, and roots in the turf. It is important to note that grass clippings do
not contribute to thatch; rather, thatch is caused by overfertilization. Therefore,
maintaining a moderate fertilization program will prevent thatch.
Answer to Question 2
Clippings should be removed when they do not readily sift down into the turf.
Controlled Experiments Manipulate a Variable
A Controlled Cross between Two Plants
Controlled cold compression unit.
A magnetically controlled vane phaser.
Controlled Scientific Experiments Scientists use experimental research to test hypotheses
Controlled genetic crosses of pea plants