Effects of different organic fertilizer substitution ratios on potato yield in the northern foothills of Yinshan Mountains in Inner Mongolia
[Objective]To explore the application effect and suitable substitution ratio of organic fertilizer substitute chemical fertilizer in potato production in the northern foothills of Yinshan Mountains in Inner Mongolia.[Methods]The experiment was conducted in Wuchuan County,Hohhot City,Inner Mongolia.Eight treatments were set up,including 100%M(100%organic fertilizer),75%M(75%organic fertilizer + 25%chemical fertilizer),50%M(50%organic fertilizer + 50%chemical fertilizer),25%M(25%organic fertilizer+75%chemical fertilizer),NPK(chemical fertilizer only,N 210 kg/hm2,P2O5120 kg/hm2,K2O 180 kg/hm2),no nitrogen fertilizer(PK),no phosphorus fertilizer(NK),and no potassium fertilizer(NP).The effects of different organic fertilizer substitution ratios on potato yield,nutrient accumulation,fertilizer utilization rate,and water use efficiency were analyzed.[Results]Under different organic fertilizer substitution ratios,yield,large tuber yield,small tuber yield,and number of tubers per plant of 25%M treatment were highest at 31 812,18 250,13.56 kg/hm2,and 7.90,respectively.Increased by 3.14%,2.22%,4.39%,and 23.82%compared with NPK treatment.25%M treatment had the highest increase of potato dry matter accumulation amount,and significantly higher(P<0.05)N accumulation amount compared with other treatments.Organic fertilizer increased potato fertilizer utilization rate,with 50%M treatment having the highest nitrogen fertilizer utilization rate at 43.94%.25%M treatment had the highest phosphorus and potassium fertilizer utilization rate at 17.57%,60.95%and highest agronomic efficiencies of nitrogen,phosphorus,and potassium fertilizer at 35.86%,38.98%,and 25.00%,respectively.25%M treatment had the highest water use efficiency at 125.81 kg/(hm2·mm),significantly higher(P<0.05)than other treatments.[Conclusion]25%M(25%organic fertilizer + 75%chemical fertilizer)treatment increased potato yield,nutrient accumulation,and fertilizer utilization rate,improved water use efficiency,was the optimal fertilization method for potato production in the northern foothills of Yinshan Mountains in Inner Mongolia.
Organic fertilizer substitutionPotatoYieldNutrient accumulationFertilizer utilization rateWater use efficiency
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