Impact of long-term nutrient management on sequestration and dynamics of soil organic carbon in a semi-arid tropical Alfisol of India

Selvaraj, Anandakumar; Bakhoum, Niokhor; Chinnadurai, Chinnappan; Malarkodi, M.; Arulmozhiselvan, K.; Karthikeyan, Subburamu; Balachandar, D.

doi:10.1016/j.apsoil.2022.104549

Cited by 23 publications

(5 citation statements)

References 79 publications

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“…This study by exploring the SOC and TN storage in the subsoil in the topsoil will essentially enhance our understanding of the role of long‐term fertilization to improve SOC and TN storage. Therefore, further investigation is urgently needed for a better understanding of the responses of improving SOC and TN stocks at profile level after long‐term mineral and manure fertilization which can improve crop production and reduce greenhouse gas emissions (Bremer et al, 2011; Cai et al, 2016; Mustafa et al, 2020) but is also vital for conserving soil quality and ensuring global food security (Anandakumar et al, 2022; R. Lal, 2004; Lasanta et al, 2020). Given this, practices to enhance the SOC and TN stocks in croplands have attracted the attention of the scientific community in recent years.…”

Section: Introductionmentioning

confidence: 99%

Long‐term manure application enhances organic carbon and nitrogen stocks in Mollisol subsoil

et al. 2022

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Subsoils contain half of the total soil organic carbon (SOC) that is supposed to be relatively more persistent than that present in the topsoil. Improving SOC and total nitrogen (TN) stocks in croplands is crucial to mitigate climate change and ensuring food security. However, our insight into how the management practices and climatic variables influence stocks of SOC and TN, and crop grain yields in the soil profile is limited. In this study, we assessed the long-term impacts of mineral and manure fertilizers on SOC and TN stocks at soil profile levels (up to 100 cm), and cropping system (wheat-maize-soybean) grain yields. Results indicated that in the top 0-40-cm layers SOC and TN stocks were the highest in manure plus mineral fertilizers (MNPK) compared with control, that is, non-fertilized control (CK). Conversely, compared with NPK, sole application of manure (M) clearly increased SOC stocks by 19%, 40%, and 39% and TN stocks by 51%, 105%, and 116% in 40-60, 60-80, and 80-100 cm, respectively (p < 0.05). Moreover, Pearson correlation revealed that climate variables, that is, mean annual temperature (MAT) affected both SOC and TN stocks in 0-40-cm layers only of the soil profile. Our findings implicated that the sole application of manure (M) is vital to augment SOC and TN sequestration, particularly in the subsurface layers. However, trade-offs between SOC and TN sequestration and crop yields should also need to be considered while making recommendations for

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Section: Introductionmentioning

confidence: 99%

Long‐term manure application enhances organic carbon and nitrogen stocks in Mollisol subsoil

et al. 2022

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“…However, we did not observe a significant improvement in soil organic carbon. This is likely because of the short‐term incorporation of organic materials, which did not enhance the abundance of carbon turnover‐related genes and enzymes' activity, therefore failing to improve soil carbon sequestration (Anandakumar et al., 2022).…”

Section: Discussionmentioning

confidence: 99%

The improvement of soil properties in rice cropping systems using an integrated fertilization method to increase rice yield

Zhu,

Yin,

et al. 2024

Soil Use and Management

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The global food crisis provides an impetus for agricultural green transformation via optimized fertilization methods. While organic substitution, green manure incorporation, and targeted fertilization sites have individually shown promise in enhancing rice yield, there is still a gap between optimized fertilization methods and achieving sustainable rice production. To explore the factors influencing rice yield across different fertilization strategies, we conducted a field experiment in Southern China encompassing five treatments, such as CK (no N input), RN (broadcasting urea with recommended N rates), RON (broadcasting organic–inorganic fertilizer with recommended N rates), RONS (side‐deep placement of organic–inorganic fertilizer with recommended N rates), and RONSA (coupled RONS with Azolla [Azolla pinnata R. Brown]). Using a Minimum Data Set approach, we identified the primary variables influencing soil properties and rice production, with a focus on soil physicochemical characteristics and bacterial communities. Further, the soil properties index (SPI), calculated by multiplying the linear score with the weight of each variable, served as an indicator of soil properties variations. Our findings revealed that RONSA significantly increased the SPI by 21.1% compared with RN, predominantly because of higher soil labile organic carbon (LOC) and available N (SAN) fractions (p < .05). N uptake in rice plants (23.9%–28.4%) increased dramatically under RONSA leading to higher rice yield (11.0%–16.9%) and NUE (30.2%–36.1%) than RN (p < .05). The enhancement in soil properties, characterized by increased LOC, SAN fractions, and bacterial community diversity, was essential in boosting rice yields, with dissolved inorganic N emerging as the dominant contributor. In summary, our results highlight the effectiveness of integrated fertilization approaches in enhancing soil properties, subsequently leading to improved rice yields and NUE. This fertilizer strategy holds promise for guiding field fertilization practices and advancing sustainable rice production.

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“…The substrate-induced respiration and metabolic quotient of rhizosphere soils of Co51 and Norungan were compared with bulk soils and moisture stress conditions. These two respiration indices are potential sensitive indicators of soil microbial activity and are used to monitor soil microbial metabolism (Anandakumar et al 2022;Tamilselvi et al 2015). The substrate-induced respiration rate is high when the soil's microbial population is active.…”

Section: Discussionmentioning

confidence: 99%

Rhizosphere functioning and rhizo-microbiome of two contrasting genotypes of rice under drought-induced conditions

Nunna¹,

Balachandar

2022

Preprint

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Background and aim Rhizosphere function is the key determinant of crop growth and fitness under moisture-stress conditions. Human-centered breeding adversely affects microbiome recruitment of crops. Hence, during drought, wild types and landraces adapt to stress, while modern cultivars and hybrids fail to do so and are susceptible to drought. Understanding the rhizosphere difference between landraces and cultivars will help to improve microbiome-mediated drought mitigation. Methods We compared rhizospheres of rice landrace, Norungan, and high-yielding cultivar, Co51, grown under normal moisture and drought-induced conditions using soil biochemical and 16S rRNA gene sequencing approach. Results Soil carbon pools, enzymes, and respiration were adversely affected due to drought in both genotypes' rhizospheres. However, Norungan rhizosphere accounted for less harm to the soil attributes than Co51. Reduction in soil organic carbon (3.94%), microbial biomass carbon (14.26%), labile carbon (1.94%), dehydrogenase (10.1%), urease (21.27%), phosphatase (9.61%), and respiration rate (15.02%) was accounted in Co51 than Norungan, during drought. Alpha diversity of bacterial communities in rice's rhizosphere was significantly lower than in bulk soil, and drought further reduced the diversity in both genotypes. Moisture-stress reduced the abundance of Firmicutes (180%) and Bacteroidetes (57%) in Norungan's rhizosphere, while, Acidobacteria (51%), Actinobacteria (54%), Chlolorflexi (41%), and Proteobacteria (34%) got increased. On the other hand, Co51 rhizosphere acquired an enhanced abundance of Firmicutes (79%) and Bacteriodetes (170%) and lessened abundance of Acidobacteria (15%) and Proteobacteria (31%) due to drought. Conclusion These results suggest that landrace Norungan under moisture-stress conditions recruits less-diversified, specific groups of microorganisms to augment rhizosphere functioning.

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Impact of long-term nutrient management on sequestration and dynamics of soil organic carbon in a semi-arid tropical Alfisol of India

Cited by 23 publications

References 79 publications

Long‐term manure application enhances organic carbon and nitrogen stocks in Mollisol subsoil

Long‐term manure application enhances organic carbon and nitrogen stocks in Mollisol subsoil

The improvement of soil properties in rice cropping systems using an integrated fertilization method to increase rice yield

Rhizosphere functioning and rhizo-microbiome of two contrasting genotypes of rice under drought-induced conditions

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