Long-term no tillage alleviates subsoil compaction and drought-induced mechanical impedance

IF 2 4区农林科学 Q2 AGRONOMY

International Agrophysics Pub Date : 2022-10-05 DOI:10.31545/intagr/154596

Hengfei Wang, Li Wang, T. Ren

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引用次数: 2

Abstract

. No tillage was introduced to Northeast China to prevent the soil degradation caused by conventional tillage systems. However, there are concerns that no tillage will result in soil mechanical impedance. In this study, we investigated the effects of conventional tillage and no tillage on soil strength properties using a long-term field study initiated in 2011 on a silt clay loam soil. In 2018 and 2019, soil bulk density, water content, the degree of compactness, and penetrometer resistance were measured before tillage and after planting, and also, the changes in soil profile water content and penetrometer resistance were monitored during drying periods. Results showed that conventional tillage led to the formation of a compacted zone beneath the cultivated layer, with higher bulk density, degree of compactness, and penetrometer resistance values. After converting from conventional tillage to no tillage for 8 to 9 years, the bulk density, penetrometer resistance, and degree of compactness were increased to a moderate extent in the topsoil but were lowered in the subsurface soil. During drying periods, as compared to conventional tillage plots, the no tillage plots maintained higher water contents, which resulted in lower penetrometer resistances below a 15 cm depth and the later arrival of the threshold penetrometer resistance of 2 MPa. Long-term no tillage alleviated subsoil compaction and retarded drought-induced soil strength development.

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长期免耕减轻底土压实和干旱引起的机械阻抗

．为了防止传统耕作制度造成的土壤退化，在东北地区引入了免耕制度。然而，人们担心不耕作会导致土壤的机械阻抗。在这项研究中，我们通过2011年开始的对粉质粘壤土的长期实地研究，研究了常规耕作和免耕作对土壤强度特性的影响。2018年和2019年分别在耕作前和种植后测量了土壤容重、含水量、密实度和穿透电阻，并监测了干旱期土壤剖面含水量和穿透电阻的变化。结果表明:常规耕作可使耕层下方形成密实带，其容重、密实度和穿透电阻值均较高;由常规耕作转为免耕8 ~ 9年后，表层土壤容重、穿透阻力和密实度均有中等程度的提高，而地下土壤容重、密实度则有所降低。在干燥期，与常规耕作地块相比，免耕地块保持较高的含水量，这导致15cm以下的穿透阻力较小，并且较晚到达2 MPa的穿透阻力阈值。长期免耕缓解了底土压实，延缓了干旱引起的土壤强度发育。

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来源期刊

International Agrophysics 农林科学-农艺学

CiteScore

3.60

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： The journal is focused on the soil-plant-atmosphere system. The journal publishes original research and review papers on any subject regarding soil, plant and atmosphere and the interface in between. Manuscripts on postharvest processing and quality of crops are also welcomed. Particularly the journal is focused on the following areas: implications of agricultural land use, soil management and climate change on production of biomass and renewable energy, soil structure, cycling of carbon, water, heat and nutrients, biota, greenhouse gases and environment, soil-plant-atmosphere continuum and ways of its regulation to increase efficiency of water, energy and chemicals in agriculture, postharvest management and processing of agricultural and horticultural products in relation to food quality and safety, mathematical modeling of physical processes affecting environment quality, plant production and postharvest processing, advances in sensors and communication devices to measure and collect information about physical conditions in agricultural and natural environments. Papers accepted in the International Agrophysics should reveal substantial novelty and include thoughtful physical, biological and chemical interpretation and accurate description of the methods used. All manuscripts are initially checked on topic suitability and linguistic quality.