mohammad shahverdi; bahram Mirshekari; Hadi Asadi Rahmani; varahram rashidi; mohammad reza ardakani
Abstract
Towards Low Input Sustainable Agriculture (LISA), decreased chemical fertilizers and increased of forage yield (quality and quantity) this study was carried out in the experimental field of Boroujerd Agricultural Research Station (Lorestan province, Iran) in 2011. Two factorial experiments (RCBD) with ...
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Towards Low Input Sustainable Agriculture (LISA), decreased chemical fertilizers and increased of forage yield (quality and quantity) this study was carried out in the experimental field of Boroujerd Agricultural Research Station (Lorestan province, Iran) in 2011. Two factorial experiments (RCBD) with three replications have been studied. Experimental treatments including four levels of chemical fertilizers: (nitrogen and phosphorus) F0 = N0 + P0, F1 = N25 (25k/h Urea 46 percent nitrogen) + P50 (50 k/h super phosphate triple 46 percent P2O5), F2 = N50 + P100 and F3 = N75 + P150. The biological fertilizers including: control, PGPR, native rhizobium and co-inoculation. Results showed that the location had significant effect on green yield, height, regrow rate and on CP and ADF. Parameters were higher in location two than that of location 1. The CP, DMD and height were not significant under chemical and biological treatments. The highest green yield (76.16 t/ha) was observed using and native at the highest rate of chemical fertilizers (B2F4 and B3F4). The efficiency of F2B in comparison to F3B0 treatments increased green yield (0.33 percent), Crud Protein (2.6 percent), chlorophyll content (1.9 percent), regrow rate (4.69 percent), ash (3.97 percent) and decreased CF (-0.15 percent). CP correlated (r = -0.35) and negatively correlated (r = -0.73) with ADF and CF, respectively. It seems that application of reduced chemical fertilizers integrated with biological fertilizers (especially native rhizobium) can positively affect on yield as well as forage quality and led to decrease of chemical fertilizers.