Nutrient Budgeting

'Nutrient Management for Vegetable Crops in New Zealand' uses Available N (Potentially Available N) to determine crop nitrogen requirements. *
In order to raise Olsen P one unit (i.e., from 25 to 26), on average how much additional phosphorus is required per hectare for a sedimentary soil? *
What information is required in order to create a pre-planting nutrient budget for nitrogen? *
What information is required in order to create a post-harvest nutrient budget for nitrogen? *
What information is required to create a phosphorus budget? *
Using the 'Nutrient Management for Vegetable Crops in NZ' book, how much nitrogen would be required to grow 120 T/ha tomato crop if the Potentially Available Nitrogen is 60kg N/ha? *
Using the 'Nutrient Management for Vegetable Crops in NZ' book, how much phosphorus would be required to grow 120 T/ha tomato crop if the Soil Olsen P is 35ug/mL? *
In the example of growing a tomato crop, what are some of the impacts of applying too much nitrogen? *