| In order to reveal the nitrogen fertilizer application and mixing ratio of wheat-pea mixed-seeded grassland under the suitable horqin sand land habitat, four nitrogen fertilizer (pure N) application levels of 0, 70, 140, 210 kg.hm-2 (indicated by N0, N70, N140, N210, respectively), and the mixing ratios of oats and forage peas of 100:0, 80:20, 70:30, 60:40, 50: 50, 0:100 (denoted by W0, W20, W30, W40, W50, W100, respectively) six treatments of single sowing and mixing ratios, and a two-factor randomized block trial in the field to analyze the effects of N fertilizer application and mixing ratios and their interactions on the yields of wheat-pea mixing grassland and the interspecific relationships.The results showed that: with the increase of nitrogen fertilizer application, the total yields of oats, forage peas, and wheat beans all showed a gradual increase in the trend of change, and the hay and fresh grass yields of the N210 treatment were significantly higher than those of the N0 and other nitrogen fertilizer treatments ( P<0.05); with the increase in the proportion of the forage pea mix, the fresh grass yield of oats was on a decreasing trend, and fresh grass and hay yields of the forage peas showed a trend of increase, and the oat hay, Total wheat-pea yield showed an increasing and then decreasing trend, W40 mixing ratio treatment wheat-pea forage crop yield was the highest; the interaction of nitrogen fertilizer and mixing ratio further confirmed that under N210W40 treatment, wheat-pea mixing meadow fresh grass and hay yield was the highest, 34.4 t.hm-2 and 10.53 t.hm-2, respectively. the soil equivalent ratio was greater than 1 under different mixing ratios, with the The highest soil equivalent ratio was 1.19 in the W40 treatment.The relative yields of oats in the wheat-bean mixed-grassland were all greater than that of forage peas, the aggression intensity of oats was greater than 0, and the competition ratio of oats was greater than that of forage peas.Therefore, it was recommended to use 60:40 wheat-bean mix ratio and 210 kg.hm-2 N fertilizer dosage for wheat-bean mix grassland production in Horqin sandy land. |