Effects of irrigation and fertilizer on quality of Bromus inermis

In order to improve the water and fertilizer utilisation efficiency of Bromus inermis, the influences of irrigation, quantity of nitrogen, phosphorus and potassium fertilizer on quality of B. inermis in Kerqin sandy land were analyzed using orthogonal design method. The results showed that the quantity of nitrogen fertilizer had very significantly effects (P0.01) on the dry biomass and crude fiber content and had significant effects (P0.05) on the crude fat content and ash content. The irrigation had very significantly effects (P0.01) on the dry biomass and crude fiber content and did not have significant effects on the crude fat content and ash content. Both phosphorus fertilizer and potassium fertilizer had significantly effects (P0.05) on the dry biomass and crude fiber content and did not have significant effects on the crude fat content and ash content. The independent effects of four factors on quality was nitrogen fertilizerirrigation quantityphosphorus fertilizerpotassium fertilizer. The multiple indices comprehensive analysis revealed that the optimum treatment to improve B. inermis quality was the combination of 450 kg·ha-1 nitrogen fertilizer, 1 000 m3·ha-1 irrigation quantity, 200 kg·ha-1 phosphorus fertilizer and 75 kg·ha-1 potassium.