Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (8): 91-100.doi: 10.11924/j.issn.1000-6850.casb2023-0569

Previous Articles     Next Articles

Effects of Exogenous Additives on Soil Fertility Under Different Land Use Type

DENG Bo1(), GUO Peng1,2, WEI Leijia1, CHEN Shangmao1, MA Ze1, CHEN Dan1, BI Lidong1()   

  1. 1 College of Agricultural Science and Engineering, Hohai University, Nanjing 211100
    2 Zhongnan Engineering Corporation Limited of Power China, Changsha 410014
  • Received:2023-07-31 Revised:2023-12-20 Online:2024-03-15 Published:2024-03-10

Abstract:

To clarify the effects of exogenous additives on soil fertility under different land uses types (forest land, paddy field and dry field) and to provide reference for the use of exogenous additives in agricultural production and environmental management. Four exogenous additives including quicklime (1 g/kg), fulvic acid (10 g/kg), fish pond sediment (250 g/kg) and biochar (15 g/kg), were added to soil samples from forest land, paddy field and dry field to study the effects of quicklime, fulvic acid, fish pond sediment and biochar on the content of available nitrogen, available phosphorus and available potassium of the soil. The results showed that, under the same exogenous additives, the content of soil available nitrogen in different land uses showed the trend of dry field>forest land>paddy field, the content of soil available phosphorus showed the trend of cultivated layer paddy field>dry field>forest land and plow bottom dry field>paddy field>forest land, and the content of soil available potassium did not have any obvious pattern. Quicklime had no significant effect on the content of soil available nitrogen, which would increase the content of soil available phosphorus by 14.87% on average and reduce the content of soil available potassium by 6.19% on average; fulvic acid had no significant effect on the content of soil available nitrogen, and it would reduce the content of soil available phosphorus by 16.36% and available potassium by 12.94% on average; fish pond sediment had significant effect on soil available nutrients in the cultivated layer and plow bottom of forest land, paddy field and dry field, which would increase the average content of the soil available nitrogen by 57.68%, available phosphorus by 170.16% and available potassium by 20.05%. In addition to the increase of available nutrients brought by the fish pond sediment, it could promote the growth of soil microorganisms and thus indirectly increasing the available nutrients of the soil; biochar had no significant effect on the content of soil available nitrogen, and it would increase the content of available phosphorus and available potassium of the soil significantly, with the content of available phosphorus increasing by 89.80% and available potassium by 65.02% on average. The effects of the four exogenous additives on soil fertility under different land use types varied considerably, and the application of biochar and fish pond sediment was beneficial to improving soil fertility under different land types.

Key words: exogenous additives, soil available nutrients, land use type, soil fertility, alkali-hydrolyzable nitrogen, available phosphorus, available potassium