Phosphorus deficiencies in rapeseed are difficult to diagnose visually. Usually the plants remain dark green, but growth is stunted. Because phosphorus is not mobile in soils, it must be banded or incorporated into the soil for efficient utilization by rapeseed. Commonly, P is broadcast incorporated or drill banded. Phosphorus fertilizer rates based on a soil test.
Fertilizer can be effectively surface broadcast incorporated or drill banded.
Fertilizer can be placed with the seed, below the seed or to the side. Use whichever application method is most convenient. Potassium fertilizer rates based on soil a test. Without adequate S the rapeseed will appear light green to yellow. Plants require S to use N efficiently.