Effects of Different Nitrogen Fertilizer Inhibitors on Wheat Yield, Soil Fertility and Nitrogen Use Efficiency

doi:10.11924/j.issn.1000-6850.casb2022-0825

Abstract

Abstract:

Application of nitrogen fertilizer inhibitors is an effective way to reduce nitrogen fertilizer rate and improve N (nitrogen) use efficiency of wheat. The application effects of urease inhibitors N-butylthiophosphoramide (NBPT) and hydroquinone (HQ) and nitrification inhibitors 3,4-dimthylpyrazole phosphate (DMPP) and dicyandiamide (DCD) under the condition of 10% nitrogen fertilizer reduction on wheat yield, N use efficiency, nutrient uptake and soil fertility were explored by a field experiment. The results showed that the application of nitrogen fertilizer inhibitors could increase wheat yield and N use efficiency compared with 100% urea treatment (CK), among which the positive effect of DMPP was the greatest (P<0.05). The four nitrogen fertilizer inhibitors increased soil pH and decreased soil available phosphorus content, but had no effect on the content of soil organic matter and available potassium, compared with CK. DCD and DMPP increased the content of soil alkali-hydrolyzed nitrogen compared with CK, while NBPT and HQ had the opposite effect. DMPP and HQ increased the content of plant nitrogen and phosphorus compared with CK, while DCD and NBPT decreased the content. The four nitrogen fertilizer inhibitors decreased the plant potassium content compared with CK. In short, DMPP and HQ have the best positive effect on wheat yield and N use efficiency, and can alleviate soil acidification.

Key words: urease inhibitor, nitrification inhibitor, wheat, yield, nitrogen use efficiency, soil fertility

KAN Jianluan, WANG Xiaoyun, SU Jianping, ZHANG Yongchun, WANG Jidong, MA Hongbo, CAI Yuntong. Effects of Different Nitrogen Fertilizer Inhibitors on Wheat Yield, Soil Fertility and Nitrogen Use Efficiency[J]. Chinese Agricultural Science Bulletin, 2023, 39(5): 69-74.

Figures/Tables 7

References 33

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处理	穗数/(万个/hm²)	穗粒数/(个/穗)	千粒重/g	氮肥利用率/%
不施肥	376.05a	20.1c	35.9b
100%尿素	328.35b	36.0a	45.26ab	35.89a
DCD硝化抑制剂	333.45ab	38.8a	47.23a	38.37a
DMPP硝化抑制剂	357.60ab	37.2a	49.46a	41.57a
NBPT脲酶抑制剂	351.75ab	33.2b	47.43a	37.89a
HQ脲酶抑制剂	353.85ab	36.4a	43.26ab	40.26a

处理	穗数/(万个/hm²)	穗粒数/(个/穗)	千粒重/g	氮肥利用率/%
不施肥	376.05a	20.1c	35.9b
100%尿素	328.35b	36.0a	45.26ab	35.89a
DCD硝化抑制剂	333.45ab	38.8a	47.23a	38.37a
DMPP硝化抑制剂	357.60ab	37.2a	49.46a	41.57a
NBPT脲酶抑制剂	351.75ab	33.2b	47.43a	37.89a
HQ脲酶抑制剂	353.85ab	36.4a	43.26ab	40.26a

处理	pH	有机质/(g/kg)	碱解氮/(mg/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
不施肥	6.82a	19.14a	84.45c	20.82b	86b
100%尿素	6.38a	20.48a	117.85b	32.46a	127a
DCD硝化抑制剂	6.87a	19.83a	124.76ab	27.72ab	129a
DMPP硝化抑制剂	6.96a	20.38a	149.40a	29.36ab	126a
NBPT脲酶抑制剂	6.84a	19.86a	110.13b	23.47b	124a
HQ脲酶抑制剂	6.87a	21.07a	108.55b	29.34ab	128a

处理	pH	有机质/(g/kg)	碱解氮/(mg/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
不施肥	6.82a	19.14a	84.45c	20.82b	86b
100%尿素	6.38a	20.48a	117.85b	32.46a	127a
DCD硝化抑制剂	6.87a	19.83a	124.76ab	27.72ab	129a
DMPP硝化抑制剂	6.96a	20.38a	149.40a	29.36ab	126a
NBPT脲酶抑制剂	6.84a	19.86a	110.13b	23.47b	124a
HQ脲酶抑制剂	6.87a	21.07a	108.55b	29.34ab	128a