Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (1): 122-130.DOI: 10.3969/j.issn.1004-1524.2021.01.15

• Environmental Science • Previous Articles     Next Articles

Effect of different controlled-release fertilizers with urea ammonium on yield, nitrogen use efficiency and soil nutrients of rice

CHEN Gui1(), LU Chenni1, SHI Yanping2, NI Xiongwei2, CHENG Wangda1, ZHANG Hongmei1, WANG Baojun1, ZHANG Liping1, SUN Da3,*()   

  1. 1. Jiaxing Academy of Agricultural Science, Jiaxing 314016, China
    2. Soil, Fertilizer, Plant Protection and Rural Energy Station of Jiaxing, Jiaxing 314050, China
    3. Agricultural and Fishery Technology Extension Station of Nanhu District, Jiaxing City, Jiaxing 314051, China
  • Received:2020-07-01 Online:2021-01-25 Published:2021-01-25
  • Contact: SUN Da

Abstract:

In the present study, a field experiment was conducted to study the effect of different controlled-release fertilizers (CRFs) with urea ammonium (AU) on the yield, nitrogen use efficiency (NUE) and soil nutrients. The conventional fertilization method (N 225 kg·hm-2) was introduced as CK, and three CRFs, namely, lignin-based CRF Haolegeng (HL), urea formaldehyde-based CRF Yongxiao (YX), and nitrification inhibitor-based CRF Kaileilou (KL), were selected to form three CRF+AU modes (HL+AU, YX+AU, and KL+AU), and the N input in these modes was reduced by 0, 20%, 35% and 50% as compared with CK, respectively. It was shown that there was no significant difference in yield within the treatments of CRF+AU modes with 20% N reduction and CK. However, when N reduction rate was 35% and 50%, the yields of rice under CRF+AU modes decreased significantly (P<0.05), which could be attributed to greater ratio of decreases in panicles per unit area and grains per panicle compared to seed-setting rate and 1 000-grain weight. The NUE increased with the reduction of N input under CRF+AU modes. When N reduction rate was 50%, NUE was the highest (20.1 kg·kg-1) under KL+AU modes, and its grain physiological N-use efficiency (PE-grain) was significantly (P<0.05) increased by 14.7% than CK. When N reduction rate was 20% under YX+AU modes, the nitrogen uptake efficiency (NupE) and apparent N recovery efficiency (ANR) were significantly (P<0.05) increased by 12.4% and 22.3%, respectively, as compared with CK. Under CRF+AU modes, with the higher N reduction rate, the contents of soil alkali hydrolyzable N showed decreasing trends. However, the content of soil alkali hydrolyzable N was significantly (P<0.05) increased by 7.44%-9.57% than CK under CRR+AU modes without N reduction. Compared with CK, the soil pH under KL+AU was significantly (P<0.05) reduced by 0.17-0.31 pH unit. Based on the results of grain yield, NUE, ANR and soil nutrients, it was more reasonable to reduce N by 20% than CK under CRF+AU modes, and YX+AU had the best effect among them.

Key words: controlled-release fertilizer, urea ammonium, fertilization mode, nitrogen use efficiency, soil nutrients

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