Influência do preparo do solo no desenvolvimento de todo sistema radicular da soja (Glycine max (L) merril).

Abstract

The main o b je c tiv e s o f th is paper were to study the beha v io r o f a soybean crop ( Glycine max (LJ M e rril) on two s o il ty_ pes (Dark Red Lato sol - Sandy Phase and Terra Roxa Estruturada), and four tilla g e treatments under f ie l d conditions. The tilla g e treatments were obtained by: one plowing and two tandem disking, two tanden disking, ordinary rotary and di rec t planting with rotocaster equiped with seeding and f é r t i l ! zer unit. We observed that dry weight o f roots was higher and root d istrib u tio n was deeper fo r sandy s o il than fo r the clay one. The treatments that obtained highest dry weight were in decrescent order: ordinary rotary, one plowing and two tandem disking, two tandem disking and d ire ct planting fo r the sandy so i l and fo r the clay one were: one plowing and two tandem disking ordinary rotary, d ire ct planting and two tandem disking.