The cotton plant derived a large proportion of N nutrition from the soil organic pool (up to 70%) which is composed of N sourced from previous fertiliser application and the soil N pool that has built up over the mill

Deep drainage varies considerably depending on soil properties and irrigation management, and is not necessarily ‘very small’ - 50-100 mm/yr is typical, though 0 to 900 mm/yr has been observed.

Deep drainage below irrigated crops wastes a scarce resource and can potentially lead to rising water tables and salinity.

Deep drainage below irrigated crops wastes a scarce resource and can potentially lead to rising water tables and salinity.

Deep drainage below the root zone is still the least understood component of the water balance, especially in cracking clay soils.