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Effect of Crop Planting Patterns on Soil Microorganisms and Crop Pests in Farmland
Li Linrong, Feng Jianlu, Liu Miaomiao, Mei Hao, Kang Zhenye, Cai Qingnian
Effect of Crop Planting Patterns on Soil Microorganisms and Crop Pests in Farmland
Soil connects the above-ground and underground ecosystems. Soil microorganisms play a key role in soil nutrient cycling and crop nutrient absorption from soil, which are considered as indicators of soil quality. Soil microorganisms can promote nutrient recycling and regulate plant growth and development by decomposing soil organic matter. With the variation of cropping structure in modern agriculture, especially in application of some planting patterns, adversity crop species on the above ground often affect the structure and diversity of soil microorganisms’ community, which further promote/retard crop growth and development, and have an impact on the occurrence of crop pests and crop production. In this paper, we reviewed the relationship among main planting patterns of crops in modern agriculture, soil environment and pest occurrence in farmland, highlighted the importance of scientific and reasonable selection of planting patterns, and discussed some key problems for further study of these planting patterns in agriculture practice.
crop / planting patterns / soil microorganisms / continuous cropping mode / crop rotation mode / mulching mode / pest {{custom_keyword}} /
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Intensive agricultural practices and cultivation of exhaustive crops has deteriorated soil fertility and its quality in agroecosystems. According to an estimate, such practices will convert 30% of the total world cultivated soil into degraded land by 2020. Soil structure and fertility loss are one of the main causes of soil degradation. They are also considered as a major threat to crop production and food security for future generations. Implementing safe and environmental friendly technology would be viable solution for achieving sustainable restoration of degraded soils. Bacterial and fungal inocula have a potential to reinstate the fertility of degraded land through various processes. These microorganisms increase the nutrient bioavailability through nitrogen fixation and mobilization of key nutrients (phosphorus, potassium and iron) to the crop plants while remediate soil structure by improving its aggregation and stability. Success rate of such inocula under field conditions depends on their antagonistic or synergistic interaction with indigenous microbes or their inoculation with organic fertilizers. Co-inoculation of bacteria and fungi with or without organic fertilizer are more beneficial for reinstating the soil fertility and organic matter content than single inoculum. Such factors are of great importance when considering bacteria and fungi inocula for restoration of degraded soils. The overview of presented mechanisms and interactions will help agriculturists in planning sustainable management strategy for reinstating the fertility of degraded soil and assist them in reducing the negative impact of artificial fertilizers on our environment. Copyright © 2015 Elsevier GmbH. All rights reserved.
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Naturally occurring soil microbes may be used as inoculants to maintain crop yields despite decreased resource (water and nutrient) inputs. Plant symbiotic relationships with mycorrhizal fungi alter root aquaporin gene expression and greatly increase the surface area over which plant root systems take up water and nutrients. Soil bacteria on the root surface alter root phytohormone status thereby increasing growth, and can make nutrients more available to the plant. Combining different classes of soil organism within one inoculant can potentially take advantage of multiple plant growth-promoting mechanisms, but biological interactions between inoculant constituents and the plant are difficult to predict. Whether the yield benefits of such inocula allow modified nutrient and water management continues to challenge crop biotechnologists.Copyright © 2011 Elsevier Ltd. All rights reserved.
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Continuous cropping of soybean often causes significant declines in yields of soybean because of the outbreaks of soil-borne fungal diseases. It has been reported that wild crops often harbour a unique microbiome to benefit the host plants. Thus, it is necessary to find the different community structures of the rhizomicrobiomes associated with cultivated and wild soybeans in their continuous cropping. In this study, we simulated monocropping of cultivated and wild soybeans under greenhouse conditions to investigate the rhizomicrobiomes of both soybeans. Results indicated that the bacterial community structure still maintained a changing trend after four continuous planting seasons, while fungal community structure showed a stable trend as indicated by the high similarity in the fungal community structure between the third and fourth planting rotations in both soybeans. In addition, by comparing the continuous cropping of the two soybeans, we found different fungal groups in their rhizospheres between the wild and cultivated soybeans following each passage. Spizellomycetaceae was more highly enriched in the rhizosphere following cultivation of the cultivated soybean, while Chaetomiaceae and Orbiliaceae were more highly enriched in the rhizosphere of wild soybean. Taken together, results of this study suggested that although there was the same trend of stabilized fungal development in the rhizospheres of both soybeans, wild soybean rhizosphere had different fungal groups compared with that of cultivated soybean following their continuous cropping. The findings of this study may provide useful information for the farmers with regard to planting soybean, especially when they consider growing soybean in monoculture.Copyright © 2019 Elsevier GmbH. All rights reserved.
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Cultivation of strawberry in plastic tunnels has increased considerably in Norway and in southeastern Brazil, mainly in an attempt to protect the crop from unsuitable climatic factors and some diseases as well as to allow growers to expand the traditional production season. It has been hypothesized that cultivation under tunnels could increase the incidence of one of its major pests in many countries where strawberry is cultivated, including Norway and Brazil, the two spotted spider mite, Tetranychus urticae. The objective of this study was to evaluate the effect of the use of tunnels on the incidence of T. urticae and on its natural enemies on strawberry in two ecologically contrasting regions, Norway (temperate) and southeastern Brazil (subtropical). In both countries, peak densities of T. urticae in tunnels and in the open fields were lower than economic thresholds reported in the literature. Factors determining that systematically seem to be the prevailing relatively low temperature in Norway and high relative humidity in both countries. The levels of occurrence in Norway and Brazil in 2010 were so low that regardless of any potential effect of the use of tunnel, no major differences were observed between the two cropping systems in relation to T. urticae densities. In 2009 in Norway and in 2011 in Brazil, increase in T. urticae population seemed to have been restrained mainly by rainfall in the open field and by predatory mites in the tunnels. Phytoseiids were the most numerous predatory mite group of natural occurrence on strawberry, and the prevalence was higher in Brazil, where the most abundant species on strawberry leaves were Neoseiulus anonymus and Phytoseiulus macropilis. In Norway, the most abundant naturally occurring phytoseiids on strawberry leaves were Typhlodromus (Anthoseius) rhenanus and Typhlodromus (Typhlodromus) pyri. Predatory mites were very rare in the litter samples collected in Norway. Infection rate of the pest by the fungus Neozygites floridana (Neozygitaceae) was low. The results of this work suggest that in Norway the use of tunnels might not affect the population densities of T. urticae on strawberry in years of lower temperatures. When temperature is not a limiting factor for the development of T. urticae in that country (apparently always the case in southern Brazil), strawberry cultivation in the tunnels may allow T. urticae to reach higher population levels than in open fields (because of the provided protection from the direct impact of rainfall), but natural enemies may prevent higher levels from being reached.
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Sclerotinia sclerotiorum, a notorious soil-borne pathogen of various important crops, produces numerous sclerotia to oversummer in the soil. Considering that sclerotia may also be attacked by other microbes in the soil, we hypothesized that sclerotia in soil may affect the community of soil microbes directly and/or indirectly. In this study, we inoculated sclerotia of S. sclerotiorum in soil collected from the field to observe changes in microbial diversity over three months using 16S rRNA and ITS2 sequencing techniques. Alpha diversity indices exhibited a decline in the diversity of microbial communities, while permanova results confirmed a significant difference in the microbial communities of sclerotia-amended and non-amended soil samples. In sclerotia-amended soil, fungal diversity showed enrichment of antagonists such as Clonostachys, Trichoderma, and Talaromyces and a drastic reduction in the plant pathogenic microbes compared to the non-amended soil. Sclerotia not only activated the antagonists but also enhanced the abundance of plant growth-promoting bacteria, such as Chitinophaga, Burkholderia, and Dyella. Moreover, the presence of sclerotia curtailed the growth of several notorious plant pathogenic fungi belonging to various genera such as Fusarium, Colletotrichum, Cladosporium, Athelia, Alternaria, and Macrophomina. Thus, we conclude that S. sclerotiorum when dormant in soil can reduce the diversity of soil microbes, including suppressing plant pathogens and enriching beneficial microbes. To the best of our knowledge, this is the first time a plant pathogen has been found in soil that can significantly suppress other pathogens. Our findings may provide novel cues to understand the ecology of crop pathogens in soil and maintaining soil conditions that could be beneficial for constructing a healthy soil microorganism community required for mitigating soil-borne diseases.Copyright © 2019 Elsevier Ltd. All rights reserved.
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