This invention discloses a
nitrogen-reducing fertilization method for an
intercropping system of
custard apple and soybean, relating to the field of agricultural planting technology. The invention includes: S1, soil selection: the planting field is sloping, terraced sandy
loam soil with a terrace width of 3 meters; S2,
plant arrangement: the planting spacing of
custard apple seedlings is set at 3m × 4m, and soybeans are sown at a spacing of 50cm × 80cm between
fruit tree rows; S3,
irrigation management: a
drip irrigation system is used; S4, fertilization management: basal
fertilizer is applied to the
custard apple seedlings at planting, and no further fertilization is applied after planting; the
nitrogen fertilizer application for soybeans is 23 kg / hm² to 90 kg / hm², and the
phosphorus and
potassium fertilizer applications are 75 kg / hm² and 75 kg / hm², respectively; S5,
crop management: regular weeding and pest and
disease control are carried out. This invention achieves stable yield and improved quality under
orchard intercropping conditions through moderate
nitrogen reduction treatment, followed by a chain process of "
root nodule activation—directional enrichment of functional microbial communities."