Monday, June 30, 2014

Nitrogen (N) is easily leached from the soil.  If this happens, money is wasted and ground water may be contaminated.  Nitrogen applications should be timed to meet crop demands.  Large pre-plant broadcast N applications should be avoided.  If needed, additional N can be applied by topdressing, side-dressing or injection into a trickle irrigation system.

Leafy greens, fruiting vegetables and cole crops require larger amount of nutrients and  in general require additional Nitrogen to be applied.  Heavy rainfall events may cause leaching and on sandy soils 20-40 kg/N per hectare can be lost. 

 Nitrogen deficiency in collards

It is recommended that tissue samples be taken and sent for analysis to determine nutrient levels in the plant tissue, so an adequate fertilizer regime can be established.