From paddy to different land uses - soil changes in Albaqualfs in the lowlands of southern Brazil

Ribeiro, Paula Rose de Almeida; Marco, Edenara De; Theisen, Giovani; Lima, Cláudia Liane Rodrigues de; Carlos, Filipe Selau

doi:10.1016/j.geodrs.2021.e00409

Cited by 1 publication

(3 citation statements)

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“…In the long-term, the adoption of CT can promote a decrease in soil organic matter (SOM) and physical properties degradation, especially when performed with the absence of ideal moisture conditions (Rosa et al, 2008). When tillage is carried out with high moisture, the soil structure is affected (compaction in the tractor tracks) and the soil adheres more strongly to agricultural implements, making it unfeasible (Ribeiro et al, 2021). On the other hand, when tillage is carried out with very low soil moisture, hardly breakable clods are formed, requiring more mechanical operations and increasing fuel and time consumption (Botta et al, 2015).…”

Section: Soil Management In Rice Production Systems In Southern Brazilmentioning

confidence: 99%

“…Thus, the physical quality of lowland soils has been estimated by using structural indicators related to water and gas transport, such as porosity, saturated hydraulic conductivity, soil bulk density, and mechanical resistance to penetration (Table 3). Additionally, aggregates size and stability in water have also been used (Tuchtenhagen et al, 2018;Ribeiro et al, 2021).…”

Section: Soil Physical Propertiesmentioning

confidence: 99%

“…These biopores contribute more to aeration and drainage than the pores formed by soil disturbance, which have limited connectivity among each other (Zhang et al, 2019). However, some studies which indicate beneficial effects promoted by NT in properties such as soil bulk density, mechanical resistance to penetration and porosity did not report the impacts of this system on crop yields, generating uncertainties regarding the economic feasibility of NT in lowlands (Bamberg et al, 2009;Reis et al, 2018;Tuchtenhagen et al, 2018;Ribeiro et al, 2021).…”

Section: Soil Physical Propertiesmentioning

confidence: 99%

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No-tillage for flooded rice in Brazilian subtropical paddy fields: history, challenges, advances and perspectives

Sousa¹,

Carlos²,

Silva³

et al. 2021

Revista Brasileira De Ciência Do Solo

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No-tillage (NT) has been one of the main advances related to soil management in Brazilian agriculture in the last 30 years. However, its full adoption in lowland areas that are traditionally cultivated with flooded rice is still incipient (<5 %). The main reasons are associated with the soil hydromorphic condition and the management of highly recalcitrant residual crop biomass, demanding soil disturbance even occasionally. This review presents a historical survey about the soil management systems utilized in lowland areas in southern Brazil, emphasizing the experiences of NT adoption in areas with flooded rice. Results from studies focused on the main changes in chemical, physical, and microbiological soil properties due to NT adoption were addressed, as well as the NT effects on greenhouse gas emissions and crop yields. Finally, the main challenges and prospects for NT were discussed considering new emerging scenarios for flooded rice production in lowlands, especially soybean rotation and integrated agricultural production systems. No-tillage can increase the soil organic carbon, the cation exchangeable capacity and tends to promote the accumulation of nutrients as nitrogen in surface layers. Improvements in soil aggregation, porosity and water availability are usually observed in NT, but only if medium or long-term trials are considered. NT favors microbial activity in the shallower soil layer by promoting microbial biomass carbon (+45 %), microbial biomass nitrogen (+54 %) and basal respiration (+54 %) compared to conventional tillage (CT), while the activity of extracellular enzymes also may be stimulated. Crop yield tends to be similar among the soil managements systems over time. Seasonal CH 4 emissions might be reduced by 21 % with NT adoption without increasing N 2 O. Plant breeding and geotechnology advances associated with soybean market valuation intensified the introduction of this crop in paddy fields. The main challenge for the full adoption of NT is the need for soil tillage after rice harvesting to correct soil surface irregularities or manage rice straw. In the future, advances in plant breeding and drainage techniques probably will favor the expansion of NT in southern Brazil lowlands. The traditional system of flooded rice cultivation, based on CT and monoculture associated with beef cattle under extensive grazing, is no longer viable and will not be further established.

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Section: Soil Management In Rice Production Systems In Southern Brazilmentioning

confidence: 99%

Section: Soil Physical Propertiesmentioning

confidence: 99%