Nitrogen stress has a major impact on the development of the whole plant, leading to poor growth, quality and health. Soil Nitrogen supply rarely matches plant demand, so supplementary feeding can have a major impact on plant performance. Nitrogen stress is often worse in compacted or alkaline soils, following cold, wet growing conditions and when plants experience high light intensity.
Low nitrogen status is first seen in older leaves, as nitrogen is used from chlorophyll to support new tissue development. Older leaves develop uniform chlorosis, turning from green to bright yellow. Younger leaves are always darker green.
Foliar treatment in response to visual symptoms can be very effective in maintaining growth and health, particularly during critical stages of development.