The ration of water stored in the root zone during irrigation to the water needed in the root zone prior to irrigation is called
Answers
Hey mate!! Here is your answer:
Water Requirements of Crops
Every crop requires a certain quantity of water after a certain fixed interval, throughout its period of growth. If natural rain is sufficient and timely so as to satisfy both these requirements, no irrigation water is required for raising that crop.
In a tropical country like India, the natural rainfall is either insufficient, or the water does not fall frequency of the rainfall varies throughout a tropical country, certain crop may require irrigation in a certain part of the country.The area where irrigation is a must for agriculture is called the arid region, while the area in which inferior crops can be grown without irrigation is called a semiarid region.
Hope it helps you...
Mark my answer as the brainliest....