Effects of different fertilization modes on soil aggregate particle size distribution and stability in protected vegetable fields

doi:10.14088/j.cnki.issn0439-8114.2023.04.006

Abstract

Abstract: To investigate the effects of different fertilization modes on the particle size distribution and stability of soil aggregate in protected vegetable fields, five treatments were set up： no fertilization （CK）, conventional fertilizer （CF）, optimal fertilization （OF）, combined application of straw and conventional fertilizer （CFS） and combined application of straw and optimal fertilization （OFS）. The results showed that, compared with CK treatment, the particle size distribution of aggregates in CF and CK treatment was basically the same under dry sieving. The content of aggregates greater than 5 mm in OF treatment increased, the content of aggregates ranging from 2 to 5 mm in CFS treatment increased, and the content of aggregates less than 1 mm in OFS treatment increased; under wet sieving, OFS treatment significantly increased the content of 2~5 mm and 0.25~0.5 mm aggregates, and significantly decreased the content of microaggregates （<0.25 mm）. In addition, compared with CF and CK treatment, OFS treatment significantly increased the proportion of water stable aggregates greater than 0.25 mm（WR_0.25）, average weight diameter（MWD_{water stability}） and geometric average weight diameter（GMD_{water stability}）, and significantly reduced the aggregate structure damage rate（PAD）. Continuous single application of chemical fertilizer had little effect on the particle size distribution and stability of soil aggregates, and continuous OFS treatment had the best effect on improving the particle size distribution and stability of soil aggregates in vegetable fields.

Key words: protected vegetable fields, fertilizer application, soil aggregate, particle size distribution, stability

CLC Number:

CAO Xiu-peng, HUANG Xing-xue, ZHOU Guo-lin, ZHANG Run-hua, SHI Ling-fang, DENG Yao-hua. Effects of different fertilization modes on soil aggregate particle size distribution and stability in protected vegetable fields[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(4): 32-36.

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