Nutrient management principles

Liebig's Law of the Minimum states: *
Nutrient deficiencies can be caused by *
Adding extra nutrients can decrease yield and/or quality *
Crop yield increases with added nutrients up to a point *
For most crops, the optimum pH for nutrient uptake is about *
Which nutrients are limited if soil is too acidic (pH is too low)? *
Which nutrients are limited if soil is too alkaline (pH is too high)? *
Which pairs of nutrients show synergistic uptake? *
Which pairs of nutrients show antagonistic uptake? *
A deficiency of which nutrients shows up first on old leaves? *
A deficiency of which nutrients shows up first on young leaves? *
Potential yield is a key determining factor for calculating fertiliser rates *
The risk of nitrogen leaching increases with higher levels of nitrate in the soil *
Plants can take up nitrogen as ammonium *
Nitrification is the process of converting organic nitrogen to ammonium *
Denitrification is the process of converting nitrate to ammonium *