The effect of crop residue and nitrogen fertilizer levels on soil biological properties and nitrogen indices and redistribution of dry matter in wheat (Triticumaestivum)

In order to evaluated the effect of crop residue and nitrogen fertilizer levels on soil biological, nitrogen indices and redistribution of dry matter in wheat, experimental design with 3 replicates was employed. Treatments were crop residue (CR1: 50% barley straw, CR2: 50% barley straw vetch, CR3: vetch (green manure), CR4: 100% wheat straw, CR5: rape residue mungbean (GM), CR6: Vigna radiate (GM), CR7: 25% wheat straw, CR8: No crop residue incorporation) as main plot, and nitrogen fertilizer levels ( F1: 160, F2: 270, F3: 360 kg/ha) as subplot. The result of this research showed that the highest respiration microbial and microbial biomass carbon (MBC) were obtained in CR2: barley straw vetch (GM), and C 5: rape residue mungbean (GM) incorporation. Interaction crop residue and nitrogen fertilizer on biological soil was significant and CR8F1 treatment decreased basal respiration microbial 16.2 percentage relative to CR8F3, and CR4F1 increased BRM 11.8 percentage compared to CR4F3. Nitrogen indices decreased with increasing N fertilizer from 160 to 360 kg/ha. Crop residue incorporation increased nitrogen indices compared to No crop residue application. Dry matter redistribution increased with nitrogen applied. No difference significantbetween 270 and 360 kg N ha-1 related to redistribution efficiency. In final CR2F2 and C 5F2 were the best treatments.