Effects of fertilization regimes on weed seed banks in a rice–wheat crop system

Guojun Sun1,2,3 Yong Li4 Fenhua Li1 Haiyan Zhang1 Min Han1 Fang Yuan1 Rongsong Zhu4 Zhong Ji5 Yicheng Sun1 Feng Zhu6 Dongping Xu1,2,3 Li Huang1,2,3

(1.Plant Protection and Quarantine Station in Jintan District of Changzhou, Jintan, Jiangsu, Jintan, Jiangsu 213200)
(2.Plant Protection and Quarantine Station in Jintan District of Changzhou, Jintan, Jiangsu 213200)
(3.School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu 225009)
(4.Soil and Fertilizer Technology Guidance Station in Jintan District of Changzhou, Jintan, Jiangsu 213200)
(5.Seed Management Station in Jintan District of Changzhou, Jintan, Jiangsu 213200)
(6.Jiangsu Plant Protection and Quarantine Station, Nanjing 210036)
【Knowledge Link】ATP enzyme; SD; compost; turgor; life cycle; succession

【Abstract】To reveal the effects of different fertilization treatments on weed seed banks in a rice-wheat crop system, a field test using fixed fertilization was conducted in Jintan of Changzhou, Jiangsu Province. After the four-year experiment, the weed seed species and density of the soil seed bank were investigated and the relationships among weed seed diversity, density, distribution, and fertilization were analyzed. Results showed that: fertilization reduced the number of weed species and the evenness and diversity index of the weed seed bank in a rice-wheat crop system; fertilization significantly reduced the total density of the weed seed bank, but increased the seed density of Beckmannia syzigachne, Alopecurus japonicus and A. aequalis, especially with the application of pig manure plus chemical fertilizers. Straw returning plus chemical fertilizer, organic fertilizer plus chemical fertilizer, and organic-inorganic compound fertilizer treatments had the same tendency to reduce the seed density of B. syzigachne, A. japonicus and A. aequalis. Fertilization significantly decreased the seed bank densities of broadleaf weeds. Organic fertilizers had a tendency to increase the seed bank density of Veronica undulate and Cnidium monnieri. Application of pig manure compost increased the seed bank density of Monochoria vaginalis. Therefore, different weed species had different preferences to different fertilizers as the dominant species composition of the weed seed bank was influenced by different fertilization techniques.

【Keywords】 chemical fertilizer; organic fertilizers plus chemical fertilizer; straw returning; organic and inorganic fertilizer; soil weed seed bank; rice-wheat cropping;

【DOI】

【Funds】 Special Scientific Research Fund of Agricultural Public Welfare Profession of China (Grant No. 201103004) Project for Independent Innovation of Agricultural Sciences in Jiangsu Province [Grant No. CX(14)4044] Three Agricultural Engineering Projects of Jiangsu Province (Grant No. SXGC[2015]293)

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This Article

ISSN:1005-0094

CN:11-3247/Q

Vol 24, No. 03, Pages 287-295

March 2016

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Abstract

  • 1 Methods
  • 2 Results
  • 3 Discussion
  • References