Effect of biochar and attapulgite amendment on saline soil hydraulic parameters and shrinkage

Wu, Keqian; Zhao, Wenju; Ma, Feng; Mā, Hong; Cao, Wenming

doi:10.1002/ep.14060

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…On the other hand, attapulgite soil contributes to the improvement of soil water storage capacity, thereby promoting crop growth, and root exudates can promote the formation of macro-aggregates during crop growth [44]. Wu added attapulgite directly to sandy soil; because of its significant gelling characteristics, the dispersed particles can agglomerate to form a larger particle agglomerate, thereby increasing the stability of sandy soil aggregates and improving the water holding capacity of sandy soil [45].…”

Section: Effects Of Attapulgite Application On the Formation And Stab...mentioning

confidence: 99%

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Niu,

Su,

et al. 2023

Sustainability

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Clay minerals are the main cementing substances for sandy soils to form aggregates. The clay mineral attapulgite clay is abundant in Northwest China, and its special colloidal properties and crystal structure make it excellent in improving soil physicochemical properties. Using attapulgite as soil conditioner, the effects of different application rates of attapulgite on the formation and stability of sandy soil aggregates were studied through field experiments for two consecutive years. The results showed that the application of 6000 kg·hm−2 attapulgite soil in sandy soil farmland for two consecutive years reduced the soil bulk density by 0–20 cm, from 1.55 g·cm−3 to 1.47 g·cm−3, a decrease of 3.6%; the soil pH was increased by 3.7% from 8.59 to 8.84. The soil organic carbon, inorganic carbon and total nitrogen in the whole soil increased by 4.52%, 5.23% and 6.22%, respectively. The mass fraction of macro-aggregates of 2–0.25 mm and micro-aggregates of 0.25–0.053 mm as well as the contents of organic carbon, inorganic carbon and total nitrogen increased by 3.5%, 5.2%, 8.7%, 5.6% and 6.7%, respectively, thus improving the stability of aggregates. However, low application rates (1500 kg·hm−2 and 3000 kg·hm−2) of attapulgite had no significant effect on soil physical and chemical properties. Attapulgite, as a kind of highly adsorptive clay mineral, can be directly applied to sandy soil to increase soil cementitious substances, promote the formation of soil aggregates and increase the carbon and nitrogen fixation capacity of sandy soil. The improvement effect on the formation and stability of aggregates will gradually accumulate with the years of application. Therefore, in the future, the effects of adding attapulgite on the growth of various crops under various types of soil and climatic conditions should be carried out to obtain more systematic conclusions.

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Section: Effects Of Attapulgite Application On the Formation And Stab...mentioning

confidence: 99%

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Niu,

Su,

et al. 2023

Sustainability

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“…The soil water characteristic curve (SWC) reflects the relationship between soil suction and WHC. [10][11][12][13] It can be used to directly evaluate the improvement effect of agricultural waste returning on soil WHC and is an important parameter for studying and evaluating the soil WHC. [14][15][16][17][18] Prior studies have focused on SWC under different media such as gravel, 19 biochar, [20][21][22] and different soils, 23 showing that the SWC is mainly related to soil type and porosity.…”

Section: Introductionmentioning

confidence: 99%

“…The soil water characteristic curve (SWC) reflects the relationship between soil suction and WHC 10–13 . It can be used to directly evaluate the improvement effect of agricultural waste returning on soil WHC and is an important parameter for studying and evaluating the soil WHC 14–18 .…”

Section: Introductionmentioning

confidence: 99%

Assessing the effects of agricultural waste returning on soil moisture characteristics

Yu,

Zhao,

et al. 2023

Env Prog and Sustain Energy

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Agricultural waste is an emerging and promising resource due to its abundant organic compounds and high water‐holding capacity. It plays a crucial role in improving soil water use efficiency and contributing to sustainable agricultural development. This study aimed to investigate the impact of returning agricultural waste on soil moisture characteristics. Different volume ratios (4:5:1:0, 3:5:1:1, 2:5:1:2, 1:5:1:3, and 0:5:1:4) of agricultural waste blend (AWB) consisting of cattle manure, yellow loam soil, wheat straw, and distiller's grains were examined, and the water‐holding performance of the five AWB ratios under various suction forces was compared. The analysis confirmed the suitability of the Van Genuchten‐Mualem model for fitting soil moisture characteristic curves at different ratios. The study also examined the influences of AWB ratios on soil‐specific water capacity, hydraulic parameters, and equivalent pore size. The results showed that agricultural waste effectively increased soil‐specific water capacity, available water content, soil WHC(Water‐holding capacity), and soil pore count. Furthermore, reducing cattle manure and increasing distiller's grains enhanced these effects. For instance, when the AWB ratio was 0:5:1:4, soil‐specific water capacity increased by 47.7%, while field WHC and available water content increased by 9.9% and 3.8%, respectively. Additionally, the number of extremely small and small pores increased by 1.4% and 0.77%, respectively. These findings provide valuable theoretical guidance for agricultural waste treatment and improving soil WHC. Based on the results, it is recommended to increase the proportion of distiller's grains and reduce organic fertilizer when using agricultural waste for improving soil WHC.

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Effect of biochar produced from peach pit biomass on sedimentation, water retention, and volumetric shrinkage behavior of saline kaolin clay

Xiao

Cai

Satyam

et al. 2023

Biomass Conv. Bioref.

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Effect of biochar and attapulgite amendment on saline soil hydraulic parameters and shrinkage

Cited by 4 publications

References 26 publications

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Assessing the effects of agricultural waste returning on soil moisture characteristics

Effect of biochar produced from peach pit biomass on sedimentation, water retention, and volumetric shrinkage behavior of saline kaolin clay

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