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Berlin Brandenburg

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  • 1
    Language: English
    In: Archives of Agronomy and Soil Science, 06 December 2019, Vol.65(14), pp.2013-2028
    Description: Degradation of soil quality caused by conventional tillage practices is a major concern for the sustainability of rice-wheat cropping systems in South Asian region. Therefore, suitable conservation agriculture (CA) practices are required. This study investigates the stratification and storage...
    Keywords: Conservation Agriculture ; Soil Organic Carbon ; Soil Total Nitrogen ; Storage ; Stratification Ratio ; Indo-Gangetic Plains ; Agriculture
    ISSN: 0365-0340
    E-ISSN: 1476-3567
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  • 2
    Language: English
    In: Soil & Tillage Research, September 2019, Vol.192, pp.151-163
    Description: Assessment of soil hydraulic response to conservation agriculture (CA) practices may assist in better management decisions in agriculturally sensitive and environmentally fragile agroecosystems. Although, the potential of management induced temporal changes of soil hydraulic properties (SHPs) has been studied particularly in relation to tillage, few studies have evaluated combined effects of tillage, crop residue retention and cropping sequence, which are essential components of CA, on near-saturated SHPs under field conditions. The objective of this study was thus to evaluate the long-term effect after eight years of CA practices and short-term effect of crops on near-saturated soil hydraulic conductivity, k(h), and water transmission properties under irrigated intensive cereal-based cropping systems in a semiarid climate (NW Indo-Gangetic Plains, India). There were four treatments: (1) conventionally tilled rice-wheat cropping system, (2) reduced till CA-based rice-wheat-mungbean system, (3) no-till CA-based rice-wheat-mungbean system and (4) no-till CA-based maize-wheat-mungbean system. Steady state infiltration rates were obtained at four pressure heads by hood infiltrometer consecutively over two cropping seasons, , during harvest season of rice/maize (October 2017) and maximum crop growth stage of wheat (February 2018). Data were analysed in terms of k(h), flow weighted mean pore radius (r ), hydraulically active porosity (ε) and threshold pore radius (r ), a new pore measure indicative of macropore stability derived by substituting soil’s bubble pressure in the capillary equation. Our results showed that no till-based CA enhanced k(h) as compared with conventional cultivation practice. Although the interaction effect of treatments with crop seasons were statistically non-significant (p 〈 0.05), considerable changes of soil hydraulic properties were observed over crop seasons under CA treatments. Transition from maize to wheat in the crop sequence reduced k(h) values by about 55, 44, 34 and 40% at pressure heads of 0, −1, −2 and −4 cm, respectively. In contrast, transition from rice to wheat in rice-based no till CA increased k(h) values by 129, 164, 124 and 24% in the same pressure head ranges. Irrespective of crop seasons, higher k(h) was observed under CA due to formation of macropores with better continuity, greater size and numbers as compared with conventional intensive tillage treatment. Reduced till-based CA showed an intermediate effect with respect to the different soil hydraulic characteristics in both crop seasons. Moreover, higher r values were observed for a given k(h) for CA treatments suggesting that interaggregate pores are the dominant pathways of infiltration flux in CA A relatively smaller temporal variation of r was indicative of a more stable macropore system established by rice-based CA as compared with maize-based CA CA also enhanced hydraulically active macropores as compared with intensive tillage based conventional agriculture. Overall, the results revealed that the potential impacts of CA on near-saturated SHPs are largely governed by characteristic changes in macro- and interaggregate pores.
    Keywords: Conservation Agriculture ; Near - Saturated Hydraulic Conductivity ; Flow Weighted Mean Pore Radius ; Hydraulically Active Porosity ; Bulk Density ; Aggregate Mean Weight Diameter ; Soil’s Bubble Point ; Agriculture
    ISSN: 0167-1987
    E-ISSN: 1879-3444
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  • 3
    Language: English
    In: Soil & Tillage Research, September 2019, Vol.192, pp.222-232
    Description: The water retention characteristic (WRC) and the hydraulic conductivity characteristic (HCC) vary in time due to tillage system, weather conditions and biological activity. These changes in WRC and HCC are a result of varying pore size distributions (PSD). Considering these alterations in soil hydrological models has been shown to improve simulations of water dynamics. An important prerequisite for such an approach is the periodic quantification of WRC and HCC, e.g., over a cropping cycle. Therefore, our study frequently quantified WRC and HCC together with other soil physical and chemical properties on a long-term (23 years) tillage experiment with a silt loam soil. The aim was to identify differences between the three treatments conventional tillage (CT) with a moldboard plow, reduced mulch tillage (RT) with a cultivator and no tillage (NT) with direct seeding. WRC and HCC were parameterized using the bimodal version of the well-known Kosugi retention model together with the Mualem conductivity model to account explicitly for both textural and structural pores. Consequently, bimodal PSD were inferred using the Kosugi parameters. The structural part of the bimodal Kosugi model clearly showed a shift in the PSD on CT and RT from larger to smaller pores throughout the winter wheat growing season with a recovery later in the season on RT. Saturated hydraulic conductivity was positively correlated with the abundance of transmission pores (diameter 50–500 μm) which has implications for infiltration processes under the influence of seasonal PSD changes. Overall, a frequent experimental quantification of PSD may be warranted for modeling soil water on short time scales, e.g., during a cropping cycle, while for longer time frames one to two measurement campaigns per year may be sufficient to describe soil hydraulic behaviour.
    Keywords: Conservation Agriculture ; Soil Hydraulic Properties ; Temporal Variation ; Agriculture
    ISSN: 0167-1987
    E-ISSN: 1879-3444
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