New Direction with Low-Input of Fertilization in Grasslands

Abstract

SUMMARY The modern agricultural systems have become productive but only by being highly dependent on external inputs (Altieri, 1995). A gro wing number of scientists, farmers and the general public fear for the long-term sustainabilli ty of such highly input ‐ dependent and ecologically simplified food production system. Far m chemicals ar questioned on grounds of cost but their widespread use also has implication for human and animal health and for the environement.The objectif of our paper is to mainta in biodiversity of grasslands by applying low inputs nutrients (to maintain the integrity and biological diversity) and to study the effect of organic fertilization and mulching upon phyto-di versity and productivity of grasslands from Garda de Sus The external input promovation experiment is look l ike an radical alternative for agricultural development, but on the other hand, lo ok like a negative part because „pressure” the human. This experiment took place in 2009 in Garda de Sus commune at 1320 m elevation. A randomized block repetition method with 7 different variants in 5 repetition were used. Species studied were performed using Braun- Blanquet standard method. Mowing was done at Poaceaes blooming using a spinning mowing machine. The floral composition was analysed in two different years (in 2009 and in 201 0).We observed that Agrostis capillarisFestuca rubra were the predominant types of grassland species in our analysis. There were no changes in species number and biodiversity. As result of technological inputs application, ther e were no changes recorded at the level of the treated variants’ canopy.