There is one correct way to grow any crop, and that is to have your soil tests sent to a creditable laboratory and get a competent recommendation from those results.
The purpose of growing supplements is to improve the nutrition of the stock that eats it. All effort should be aimed at maximising the health of the crop by balancing the soils, which is exactly what your Kiwi Fertiliser consultant is there to help you do.
Lucerne is a very high quality but hungry crop. With a benign climate becoming less reliable, Lucerne offers the opportunity to at least part drought-proof your property and profit. In addition, expensive bought in feed can be reduced or eliminated.
Fodder beet is the ideal crop for dairy and beef cattle and deer. It has the potential to replace maize and PKE as it is so cheap to grow when grown properly.