The usual depth for first watering in a crop field is D) 1 inch in a ploughed field.
Two commonly discussed irrigation types for crop fields are
Each of these irrigation types are performed at different times and require different amounts of water. Paleo irrigation is performed before the crops are initially planted, while Kor irrigation takes place when the plants have been planted and have grown a few inches.
The question states that the field is ploughed. This allows us to know that the crops have not been planted becuase ploughing is usually done after a harvest and before sowing the next batch of crops. For this reason, we can infer that we are dealing with Paleo irrigation.
Kor irrigation requires a usual depth of water of about 8 inches. However, in this case, we are dealing with Paleo irrigation which only requires a few centimeters of water depth, or, roughly 1 inch of watering depth. For this reason we can conclude that the answer is D) 1" inches in a ploughed field, because the other options use too much watering depth for the first watering (paleo).
Since we have concluded that the first watering is known as paleo irrigation and this requires roughly 1 inch of watering depth, the correct answer is D, 1" inches in a ploughed field.
For more on crops see:
https://brainly.com/question/1228014?referrer=searchResults
