Leaf litter C and N cycling from a deciduous permanent crop

Khalsa, Sat Darshan S.; Almanza, Carolina A.; Brown, Patrick H.

doi:10.1080/00380768.2016.1188413

Cited by 11 publications

(4 citation statements)

References 27 publications

(26 reference statements)

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“…Increased CO 2 production and its solubilization in the litter layer and topsoil water contributed to soil neutralization. It was in line with the reported higher leaf litter-derived decomposition at nearneutral pH (Khalsa et al 2016;Ferreira, Guérold 2017). On the contrary, the application of alginite amendment (at a dose of 0.5 kg⋅m -2 and 1.5 kg⋅m -2 ) tended to increase the soil pH, which was ascribed to the reported high absorption capacity (Szabó 2004;Tica et al 2011) of organomineral materials for cations, i.e.…”

Section: Discussionsupporting

confidence: 83%

Afforestation of agricultural land affects soil structural stability and related preconditions to resist drought

Holátko¹,

Holubík²,

Hammerschmiedt³

et al. 2022

J. For. Sci.

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Afforestation is important for the EU forest management strategy. Afforestation of abandoned and marginal arable land is a favourable non-agricultural land use option for climate change mitigation. It may prevent threats of drought or erosion e.g. by affecting the water balance in soil via increased structural stability. The structural stability control in afforested soil is related to i.a. organic matter content, nutrient content, soil reaction, planted tree species prosperity, and amelioration. A four-year field small-plot experiment on afforestation was carried out with Chernozem covered with deciduous (oak), coniferous (pine) or mixed planting, amended with 3 doses (no-application, 0.5 kg×m–2, and 1.5 kg×m–2) of alginite. In 2013 and 2016, soil reaction pHH2O, mean weight diameter (MWD), organic matter content (LOI) and total organic carbon (TOC) were determined and related to the soil structural stability to evaluate the soil precondition to sustain drought twice per vegetation period (spring and autumn). Afforestation significantly improved MWD compared to the field soil between 2013 and 2016 from 1.63 ± 0.04 mm to 1.85 ± 0.05 mm. Tree planting significantly neutralized the soil pHH2O, mixed planting appeared to improve LOI and TOC. Four-year afforestation led also to higher structural stability, less alkaline pH and deciduous tree-related increase in LOI, which may indicate better soil sustainability to drought.

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Section: Discussionsupporting

confidence: 83%

Afforestation of agricultural land affects soil structural stability and related preconditions to resist drought

Holátko¹,

Holubík²,

Hammerschmiedt³

et al. 2022

J. For. Sci.

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“…A significant share of leaf N was released to the ground and potentially increased the soil mineral N pool. Khalsa et al (2016) demonstrated in Prunus dulcis that leaf litter decomposition led to a larger mineral N pool. In our trial, the leaves contained, on average, 0.83% DM of N at leaf fall 2017, which represented a 60% decrease in comparison with the leaf N content at the onset of fruit ripening in the same year (2.15% DM).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen dynamics and fertilisation use efficiency: carry‐over effect of crop limitation

Verdenal

Spangenberg

Dienes-Nagy

et al. 2021

Aust J Grape and Wine Res

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Background and Aims: Knowing the impact of cultural practices on nitrogen (N) dynamics in perennial crops is critical to promote N use efficiency. This study focused on the impact of crop regulation on the plant N dynamics, on the fruit N composition, and on the N fertilisation use efficiency. Methods and Results: A large crop load gradient was set in a homogeneous plot of the grape cultivar Chasselas. Fertilisation in the form of 15 N-labelled foliar urea allowed the measurement of N uptake and partitioning among plant fractions. Dry mass, carbon, and N dynamics were assessed over two consecutive seasons. Crop regulation did not affect grape N concentration at harvest. Both N uptake and root N mobilisation were reduced in response to crop regulation. Fertilisation efficiency was higher under high-yield conditions in terms of N uptake and grape N accumulation. The carry-over effects of crop regulation in the following year were highlighted. Conclusions: Crop regulation strongly affects the overall plant N cycle, that is, uptake, distribution and release. Crop regulation improves must sugar concentration at harvest, while N concentration remained unchanged. The efficiency of N fertilisation varies greatly with crop load, which limits the interest of fertilisation under low-yield conditions. Significance of the Study: These results contribute to the development of accurate nutrition models and sustainable cultural practices.

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“…Measurements of decomposition in orchard soil studies have been isolated to incubation of leaf litter biomass as opposed to OMA sources. Leaf litter from almond, apple and peach with initial C:N ratios of 22, 26 and 37, respectively, initially reduced soil mineral N due to net N immobilization followed by net N mineralization after peak decomposition (Khalsa et al, 2016; Tagliavini et al, 2007; Ventura et al, 2010). In agroforestry, the lower leaf litter initial C:N of 29 from a woodland species was decomposed preferentially and released its nutrients faster compared with leaf litter of mango ( Mangifera indica ) with an initial C:N of 72 (Musvoto et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Nutrient dynamics from surface‐applied organic matter amendments on no‐till orchard soil

Khalsa

Hart

Brown

2021

Soil Use and Management

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Advancing conservation agriculture depends on understanding nutrient dynamics of organic matter amendments (OMA) on no‐till soil. This field incubation study compared surface‐applied composted dairy manure (CM), green waste compost (GWC) and an unamended control from March to September in 2015 and 2016 using a RCBD in a California almond (Prunus dulcis) orchard. Measurements included OMA nutrient release rates, changes in soil organic carbon (SOC), total N (TN) and inorganic N, P and K availability using in‐season soil sampling and collection of ion exchange resin (IER) membranes from 0 to 10 cm depth, and cumulative N and P availability using soil IER cores from 0 to 50 cm depth. We hypothesized OMA sources with a lower initial C:N increase soil N availability, greater soluble phosphorus (P) and potassium (K) concentrations increase P and K availability, and all OMA sources increase SOC with the greatest N recovery in the TN pool. No differences were observed in C, N and P release rates, while the K release rate was the greatest. In‐season N availability showed no effect but P and K availability differed as evidenced by greater IER adsorption and soil extractable P and K. Both OMA sources significantly increased in SOC and TN. Net N mineralization from OMA sources ranged from 0.7% to 8.0% of applied N and total N recovery in TN and inorganic N pools increased based on the initial C:N. These results advance our understanding of nutrient dynamics while conserving the soil due to the no‐till practice of surface‐applied OMA.

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Leaf litter C and N cycling from a deciduous permanent crop

Cited by 11 publications

References 27 publications

Afforestation of agricultural land affects soil structural stability and related preconditions to resist drought

Afforestation of agricultural land affects soil structural stability and related preconditions to resist drought

Nitrogen dynamics and fertilisation use efficiency: carry‐over effect of crop limitation

Nutrient dynamics from surface‐applied organic matter amendments on no‐till orchard soil

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