Mineralizacion de nitrogeno en el suelo y produccion de avena forrajera con tres sistemas de labranza

In 1995, the present research was established with zero, minimum, and conventional tillage systems, with and without nitrogen fertilization. The results correspond to 1999. The main purpose was evaluating the organic nitrogen mineralization in soil y its effect on the production of oat forage in autumn-winter season in the Comarca Lagunera, located in the north of Mexico. An experimental split block design with six treatments and three replications was used, taking into account the soil factors nitrate (NO3-N), ammonium (NH4-N) and production of fresh green and dry oat forage for the statistical analysis. The results show that the content of NO3-N in the soil was higher close to the surface, possibly as a consequence of an enzymatic activity in the surface layer (0-7.5 cm) that participates in N transformation because of better soil physical conditions, such as aeration and temperature. The highest production of oat forage was obtained in the plots prepared with zero tillage with approximately 41 t ha(-1) fertilization, and the smallest production was obtained under minimum tillage without fertilizer, with 16 t ha(-1).