Straw layer burial to alleviate salt stress in silty loam soils: Impacts of straw forms

【Author】

ZHANG Hong-yuan;LU Chuang;PANG Huan-cheng;LIU Na;ZHANG Xiao-li;LI Yu-yi;Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences;

【Institution】

Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences;

【Abstract】

Salt stress can be alleviated by straw layer burial in the soil, but little is known of the appropriate form of the straw layer for optimal regulation of soil water and salinity because of the uncontrollability of field tests. Here, the following four straw forms with compaction thickness of 5 cm buried 40–45 deep were studied: no straw layer(CK), segmented straw(SL, 5 cm in length), straw pellet(SK), and straw powder(SF). The three straw forms(SL, SK and SF) significantly delayed the infiltration of irrigation water down the column profile by 71.20–134.3 h relative to CK and the migration velocity of the wetting front under SF was the slowest. It took longer for the wetting front to transcend SK than SL but shorter for it to reach the bottom of soil column after water crossed the straw layer. Compared with CK, the average volumetric water content in the 0–40 cm soil layer increased by 6.45% under SL, 1.77% under SK and 5.39% under SF. The desalination rates at the 0–40 and 0–100 cm soil layers increased by 5.85 and 3.76% under SL, 6.64 and 1.47% under SK and 5.97 and 4.82% under SF. However, there was no significant difference among straw forms in the 0–40 cm soil layer. Furthermore, the salt leaching efficiency(SLE, g mm~(–1) h~(–1)) above the 40 cm layer under SL was 0.0097, being significantly higher than that under SF(0.0071) by 37.23%. Salt storage under SL, SK and SF in the 40–45 cm layer accounted for 4.50, 16.92 and 7.43% of total storage in the 1-m column profile. Cumulative evaporation under SL and SF decreased significantly by 41.20 and 49.00%, with both treatments having the most significant inhibition of salt accumulation(resalinization rate being 36.06 and 47.15% lower than CK) in the 0–40 cm soil layer. In conclusion, the different forms of straw layers have desalting effects under high irrigation level(446 mm). In particular, SL and SF performed better than SK in promoting deep salt leaching and inhibiting salt accumulation on the soil surface. However, SL was simpler to implement and its SLE was higher. Therefore, the segmented 5 cm straw can be recommended as an optimum physical form for establishing a straw layer for managing saline soils for crop production.

【Keywords】

straw layer;;segmented straw with 5 cm length;;straw pellet;;straw powder;;infiltration;;evaporation;;water and salt distribution

References

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Total: 25 articles

  • [1] Lei Tingwu 1,2 , Issac Shainberg 3, Yuan Pujin 1, Huang Xingfa 1, Yang Peiling 1 (1.Faculty of Irrigation and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming, Strategic Considerations of Efficient Irrigation and Salinity Control on Hetao Plain in Inner Mongolia, Transactions of The Chinese Society of Agricultural Engineering,
  • [2] Hu Shunjun~(1,2), Kang Shaozhong~1, Song Yudong~2, Tian Changyan~2, Pan Yu~3, Li Yan~2 Ministry of Education, Yangling 712100, China;2.Xingjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Wulumuqi 830011, China;3.Xingjiang Institute of Hydraulic and Hydropower Research, Wulumuqi 830049, China), Variation of phreatic evaporation and its calculation method in Tarim River basin in Xingjiang Region, Transactions of The Chinese Society of Agricultural Engineering,
  • [3] DENG Zhen-yong1,WANG Qiang2,ZHANG Qiang2,WANG Run-yuan1, BAI Hu-zhi1,WANG Jing-song1,XU Jin-fang3(1.Lanzhou Institute of Arid Meteorology,Key Open Laboratory of Arid climate Change and Reducing Disaster, China Meteorological Administration,Key Laboratory of Arid climate Change and Reducing Disaster of Gansu Province,Lanzhou Gansu 730020,China;2.Gansu Meteorological Bureau,Lanzhou Gansu 730020,China; 3.Center of Information Gansu Meteorological Bureau,Lanzhou Gansu 730020,China), Impact of Soil Water Storage Capacity and Water Consumption on Water Productivity of Spring Wheat in the Dry-Farming Area on the Loess Plateau of Gansu Province, Journal of Glaciology and Geocryology,
  • [4] Zhao Yonggan;Li Yuyi;Hu Xiaolong;Wang Jing;Pang Huancheng;Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences& Key Laboratory of Non-point Source Pollution Control,Ministry of Agriculture;Department of Resource and Environmental,College of Agronomy,Shihezi University& Key Laboratory of Oasis Ecological Agriculture,Xinjiang Production and Construction Corps;, EFFECTS OF PLASTIC MULCHING AND DEEP BURIAL OF STRAW ON DYNAMICS OF SOIL WATER AND SALT IN MICRO-PLOT FIELD CULTIVATION, Acta Pedologica Sinica,

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