What is Delta of Crop?

By K Balaji|Updated : January 24th, 2023

The delta of a crop refers to the total water depth required for a particular crop to reach maturity conditions. It is obtained by dividing the total water requirement by the area where the crop is grown. The symbol for DELTA is (Δ). It is crucial to learn the concepts of delta, duty and base period to understand the crop demands.

Delta of Crop

A delta of crops is the entire amount of water depth provided across all of the time intervals throughout its base period for the full development of crops. Delta is the total depth of water needed by all the different crops to develop (mature) to their maximum potential throughout the base period.

The base period delta of the crop refers to the entire growing period from the first distribution of irrigation water to prepare the soil for planting the crop until the last irrigation before harvest. Δ = B x 24 x 60 x 60D x 104 = 8.64 B/D meters. Various factors affect crop delta. Check out some major factors listed below.

  • Climatic conditions
  • Soil type
  • Water table depth
  • Harvest type
  • WateringMethod


What is Delta of Crop?

Delta for each crop is defined as the "total water depth (in cm) required by the crop throughout its base period" or as the "total water depth required for the crop to reach maturity". The delta for each crop is calculated by dividing the "total amount of water needed by a crop grown in a particular area" by the "area where it is grown". Hence, it can be mathematically expressed as Delta = the total volume of water supplied/ total area of land. 

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