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在淮北平原宿县,通过大穴整地、施肥改良砂姜黑土、营造Ⅰ-69杨的五年试验证明,大穴整地当年效应明显(径、高增长19.8%、91.8%);头二年肥效不显;第三年起N肥、有机肥、N×有机肥交互作用效应极显著(材积增加77%),施P+K肥效应较差,N+K肥和N+P肥经济效益较高,投入/产出为1/6.22和1/3.78;材积增加60%和58%。整地加施肥综合效益明显,有效施肥占综合效益85.1%～88.8%。
In Suhua County of Huaibei Plain, five years of experiment of dressing shale black soil with fertilization to improve Ⅰ-69 Yang through large-site soil preparation showed that the effect of large-scale site preparation was significant (diameter and high increase 19.8% and 91.8%); the first two years no significant effect In the third year, the interaction effect of N fertilizer, organic fertilizer and N × organic fertilizer was extremely significant (volume increase 77%), P + K fertilizer application was poor, N + K fertilizer and N + P fertilizer had higher economic benefits, Inputs / outputs were 1 / 6.22 and 1 / 3.78; volumes were up 60% and 58% respectively. The comprehensive benefits of site preparation and fertilization are obvious, and the effective fertilization accounts for 85.1% ~ 88.8% of the comprehensive benefit.