Irrigation with Potato Starch Processing Wastewater: Effects on Soil Quality and Corn Growth

doi:10.11924/j.issn.1000-6850.casb2021-0012

Abstract

Abstract:

The effect of potato starch processing wastewater on soil properties and corn growth was studied to explore the optimal amount of wastewater returned to field. 5 treatments were set up including groundwater 3000 m³/hm²(W₁, CK), wastewater 600 m³/hm² (W₂), wastewater 900 m³/hm²(W₃), wastewater 1200 m³/hm²(W₄), wastewater 3000 m³/hm²(W₅). Soil aggregates, N, P, K, organic matter, enzymes, and corn emergence rate and yield under different treatments were analyzed. The results showed that: the content of soil water-stable aggregates of 0.25-2 mm size increased firstly and then decreased with the increase of wastewater irrigation amount, increased by 14.90%, 17.04%, 4.09% and 16.67% respectively under W₂, W₃, W₄ and W₅ compared with that of CK. Irrigation with wastewater for 1 year, the content of alkaline nitrogen, available potassium, available phosphorus and soil organic matter in the 0-20 cm surface soil were both higher than those in CK. The activities of catalase, urease and phosphatase reached the highest respectively under W₄, W₂and W₄, increased by 9.64%, 5.34% and 17.24%. The rate of maize emergence was reduced when wastewater irrigation exceeded 1200 m³/hm². Maize yield reached the highest under W₃ in 2018 and 2019, which were 69171 and 59404.5 kg/hm², respectively. Among them, the optimal wastewater irrigation amount is 900 m³/hm².

Key words: potato, starch processing, wastewater, irrigation, corn, soil quality

CLC Number:

Lei Xiaoting, He Jinqin, Lei Jinyin, Qi Huanjun, Xu Jinyu, Jin Jianxin, Wang Tianning. Irrigation with Potato Starch Processing Wastewater: Effects on Soil Quality and Corn Growth[J]. Chinese Agricultural Science Bulletin, 2021, 37(19): 106-111.

Figures/Tables 11

References 28

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土层/cm	有机质/(g/kg⁾	碱解氮/(mg/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
0~20	12.25±0.92	75±2.24	15.75±0.58	167.5±7.68
20~40	9.36±0.32	51.5±1.54	3.8±0.28	127±4.21

土层/cm	有机质/(g/kg⁾	碱解氮/(mg/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
0~20	12.25±0.92	75±2.24	15.75±0.58	167.5±7.68
20~40	9.36±0.32	51.5±1.54	3.8±0.28	127±4.21

处理	灌溉1年				灌溉2年
处理	总穴数/个	出苗数/个	出苗率/%	产量/(kg/hm²)	总穴数/个	出苗数/个	出苗率/%	产量/(kg/hm²)
W₁	336	174	51.7	39058.5c	336	171	50.9	41285.5b
W₂	336	186	55.4	53074.5b	336	180	53.6	58419.0a
W₃	336	190	55.5	69171.0a	336	177	52.7	59404.5a
W₄	336	176	52.3	56229.5b	336	188	55.9	55246.5a
W₅	336	65	19.3	48462.0d	336	62	18.6	46684.5b

处理	灌溉1年				灌溉2年
处理	总穴数/个	出苗数/个	出苗率/%	产量/(kg/hm²)	总穴数/个	出苗数/个	出苗率/%	产量/(kg/hm²)
W₁	336	174	51.7	39058.5c	336	171	50.9	41285.5b
W₂	336	186	55.4	53074.5b	336	180	53.6	58419.0a
W₃	336	190	55.5	69171.0a	336	177	52.7	59404.5a
W₄	336	176	52.3	56229.5b	336	188	55.9	55246.5a
W₅	336	65	19.3	48462.0d	336	62	18.6	46684.5b