Tim Kerr, fertiliser specialist for Hutchinsons turns his expertise to vines.
The wet autumn will have impacted on crop nutrient availability into next spring. After excessive rainfall, lower levels of nitrogen will be seen. Soil mineral nitrogen can be measured to make necessary adjustments.
Although nitrogen requirement by vines isn't high, it's a difficult element to hold in soils over winter, particularly soils with low cation exchange capacity. Light soils, which are low in clay and/or organic matter, have low resilience to hold nitrogen reserves, even with additional nitrogen from decaying vine leaves.