Nitrogen Fertilizer and Nitrapyrin for Greenhouse Gas Reduction in Wolfberry Orchards on the Qinghai–Tibetan Plateau

Jiujin Lu, Yunzhang Xu, Haiyan Sheng, Yajun Gao, Jim Moir, Rong Zhang and Shouzhong Xie
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Jiujin Lu: Department of Agriculture and Forestry, College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China
Yunzhang Xu: Department of Agriculture and Forestry, College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China
Haiyan Sheng: Department of Agriculture and Forestry, College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China
Yajun Gao: State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China
Jim Moir: Soil Science Department, Lincoln University, Lincoln, 7647 Christchurch, New Zealand
Rong Zhang: Qinghai Academy of Agriculture and Forestry, Xining 810016, China
Shouzhong Xie: Nuomuhong Farm, Dulan 816100, China

Agriculture, 2022, vol. 12, issue 7, 1-16

Abstract: Wolfberry production has become a major agro-industry on the Qinghai–Tibetan Plateau, causing increased nitrogen (N) pollution and greenhouse gas (GHG) emissions. Appropriate N fertilizer rate and nitrification inhibitors may mitigate GHG emissions and improve N use efficiency. A 2-year field experiment was conducted to measure the effects of N application rate and nitrapyrin on GHG emissions, to reduce GHG emissions and N pollution. We used eight treatments: Control (CK), 667 kg·ha −1 N (Con), 400 kg·ha −1 N (N 400 ), 267 kg·ha −1 N (N 267 ), 133 kg·ha −1 N (N 133 ), 400 kg·ha −1 N plus 2.00 kg·ha −1 nitrapyrin (N 400 I 2.00 ), 267 kg·ha −1 N plus 1.33 kg·ha −1 nitrapyrin (N 267 I 1.33 ) and 133 kg·ha −1 N plus 0.67 kg·ha −1 nitrapyrin (N 133 I 0.67 ). Compared with Con treatment, N 400 maintained fruit yield and increased net income, but saved 40% of N fertilizer and decreased the cumulative N 2 O emission by 14–16%. Compared to N 400 , N 267 and N 133 treatments, the cumulative N 2 O emission of N 400 I 2.00 , N 267 I 1.33 and N 133 I 0.67 treatments was reduced by 28.5–45.1%, 26.6–29.9% and 33.8–45.9%, respectively. Furthermore, N 400 I 2.00 resulted in the highest wolfberry yield and net income. The emissions of CH 4 and CO 2 were not significantly different among treatments. Moreover, the global warming potential (GWP) and the greenhouse gas emission intensity (GHGI) of N 400 I 2.00 declined by 45.6% and 48.6% compared to Con treatment. Therefore, 400 kg·ha −1 N combined with 2.00 kg·ha −1 nitrapyrin was shown to be a promising management technique for maintaining wolfberry yield while minimizing GWP and GHGI.

Keywords: wolfberry; N fertilizer rate; nitrapyrin; greenhouse gas emissions; yield (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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