ABSTRACT
Most f e r t i l i z e r research o v e r t h e l a s t 30 years has been conducted w i t h conven t iona l t i l l a g e . U s u a l l y conven t iona l t i l l a g e has i m p l i e d p r i m a r y t i l l a g e w i t h a moldboard p low fo l lowed by v a r i o u s secondary t i l l a g e o p e r a t i o n s i n c l u d i n g d i s k i n g , f i e l d c u l t i v a t i n g and harrowing. Consequently, n i t r o g e n (N) recommendations have been based on a c r o p management system t h a t i s much d i f f e r e n t t h a t t h e c o n s e r v a t i o n t i l l a g e systems now g a i n i n g p o p u l a r i t y .
