Effect of Differentiated Nitrogen Fertilization on the Enzymatic Activity of the Soil for Sweet Potato (Ipomoea batatas L. [Lam.]) Cultivation

The experiment was conducted between 2015–2017 in the Research Station for Cultivar Testing in Uhnin (51°34′ N, 23°02′ E), in Luvisols developed from sandy loam soils. Soil samples for the tests of enzymatic activity were collected after the crop was harvested. The measurements included: the content of dehydrogenases, phosphatases, urease and protease, as well as total organic carbon, total nitrogen and mineral nitrogen in soil, based on standard methods. The research results point to changes in the enzymatic activity of light soil under the influence of varied nitrogen fertilization. In objects fertilized with this ingredient, the activity of the analysed enzymes was significantly higher than in the control soil, except for combinations fertilised with 150 kg ha−1 N characterised by the highest accumulation of N-NO3− in soil. The activity of dehydrogenases, phosphatases and urease changed as the nitrogen dose increased. The polynomial regression analysis enabled a better understanding of those dependences. In the case of dehydrogenases, phosphatases and urease, a third-degree curvilinear relation of enzymatic activity to nitrogen fertilisation was observed (a fourth-degree relation was found, with a coefficient R2 in those equations amounting to =0.958, 0.977, 0.979, respectively) and in the case of protease activity, a fourth-degree relation, with coefficient R2 = 0.989. However, soil acidity did not have a significant influence on either the enzymatic activity or physico-chemical characteristics of soil under the cultivation of sweet potatoes. The C:N ratio turned out to be significantly negatively related to the content of the enzymes dehydrogenase (Adh), phosphatase (AF), urease (AU) and protease (AP) as well as the content of total nitrogen, especially its ammonium form (N-NH4). The obtained results indicate the usefulness of research on enzymatic activity as an indicator of soil reaction to nitrogen fertilization and will enable maintenance of the optimal biological balance of cultivated soils.

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Vertical Distribution of TOC, TN and Other Important Soil Attributes and Their Relationship in Alfisol and Entisol of West Bengal

International Journal of Environment and Climate Change ◽

10.9734/ijecc/2020/v10i130176 ◽

2020 ◽

pp. 62-73

Author(s):

S. Rakesh ◽

Abhas Kumar Sinha ◽

Prabir Mukhopadhyay

Keyword(s):

Organic Carbon ◽

Vertical Distribution ◽

Bulk Density ◽

Total Nitrogen ◽

West Bengal ◽

Sandy Loam ◽

Soil Depth ◽

C:N Ratio ◽

Climatic Conditions ◽

Soil Attributes

A study to assess the profile distribution of important soil attributes in Alfisols and Entisols of West Bengal was conducted during 2016-17. Purposefully selected random sampling was carried out to collect the soils from different locations of two study sites, viz., Kalinagar (25º27'33.9"N, 88º19'10.2"E) from Malda district and Durganagar (26º09'62.7"N, 89º53'51.7"E) from Cooch Behar district of West Bengal at 0-15, 15-30, 30-45 and 45-60 cm depths. Understanding of vertical distribution of soil fertility indicators like soil organic carbon (SOC), total nitrogen (TN) and other important properties in two different soil and climatic conditions will provide an insight regarding the behaviour of soil with the change in environmental conditions. Soil bulk density (BD), porosity, pH, SOC, TN, C:N ratio and texture were determined using standard laboratory procedures and computations. Obtained results were subjected to statistical analyses. Soils of Kalinagar sites were slightly acidic in nature while soils of Durganagar were neutral in nature. Kalinagar soils were silt clay loam in texture where Durganagar soils classified as loam to sandy loam. Soil BD values increased with depth in both Kalinagar (Alfisol) and Durganagar (Entisol). The porosity percentage progressively decreased with an increase in depth. Soils of Durganagar reported higher soil porosity at all the depths studied. An increase in soil pH with increasing depth was observed in both the sites. The mean total organic carbon (TOC) content recorded maximum in surface soil and its concentration decreased with the depth. Kalinagar soils observed 7.63% higher TOC (17.94 g kg-1) content than Durganagar (16.57 g kg-1) at surface depth (0-15 cm) and its accumulation at the lower depths was also maximum in former soil. Mean TN values were also found to decrease by increasing the depth. The accumulation of total nitrogen at the subsequent depths was relatively higher in Kalinagar than Durganagar. Increase in C:N ratio with increasing depth was noticed in Kalinagar site but the opposite trend was accorded in case of Durganagar. Accumulation of SOC and TN throughout the soil depth was found to be greater in Alfisol (Kalingar) due to higher clay and silt fractions as compared to Entisol (Durganagar). There was a significant positive relation of TOC with clay and silt (r = 0.285, p<0.05, r = 0.314, p<0.01, respectively) and of TN with clay and silt (r = 0.328, p<0.01, r = 0.262, p<0.05, respectively) irrespective of soil orders. Alfisols with high bulk density have a greater capacity to accumulate SOC and TN throughout the soil profile due to higher clay and silt fractions in comparison to Entisols with loose textural properties.

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Revealing horizontal and vertical variation of soil organic carbon, soil total nitrogen and C:N ratio in subtropical forests of southeastern China

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.112483 ◽

2021 ◽

Vol 289 ◽

pp. 112483

Author(s):

Jiaqi Dong ◽

Kangning Zhou ◽

Peikun Jiang ◽

Jiasen Wu ◽

Weijun Fu

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Total Nitrogen ◽

C:N Ratio ◽

Vertical Variation ◽

Southeastern China ◽

Subtropical Forests ◽

Soil Total Nitrogen

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Influence of Physicochemical Characteristics of Bean Crop Soil in Trichoderma spp. Development

Agronomy ◽

10.3390/agronomy11020274 ◽

2021 ◽

Vol 11 (2) ◽

pp. 274

Author(s):

Sara Mayo-Prieto ◽

Alejandra J. Porteous-Álvarez ◽

Sergio Mezquita-García ◽

Álvaro Rodríguez-González ◽

Guzmán Carro-Huerga ◽

...

Keyword(s):

Organic Matter ◽

Sandy Loam ◽

C:N Ratio ◽

Physicochemical Characteristics ◽

Soil Parameters ◽

Physical Parameters ◽

Silt Loam ◽

Chemical Methods ◽

Trichoderma Spp ◽

Trichoderma Species

Spain has ranked 6th on the harvested bean area and 8th in bean production in the European Union (EU). The soils of this area have mixed silt loam and sandy loam texture, with moderate clay content, neutral or acidic pH, rich in organic matter and low carbonate levels, providing beans with high water absorption capacity and better organoleptic qualities after cooking. Similar to other crops, it is attacked by some phytopathogens. Hitherto, chemical methods have been used to control these organisms. However, with the Reform of the Community Agrarian Policy in the EU, the number of authorized plant protection products has been reduced to prevail food security, as well as to be sustainable in the long term, giving priority to the non-chemical methods that use biological agents, such as Trichoderma. This study aimed to investigate the relative importance of various crop soil parameters in the adaptation of Trichoderma spp. autoclaved soils (AS) and natural soils (NS) from the Protected Geographical Indication (PGI) “Alubia La Bañeza—León” that were inoculated with Trichoderma velutinum T029 and T. harzianum T059 and incubated in a culture chamber at 25 °C for 15 days. Their development was determined by quantitative PCR. Twelve soil samples were selected and analyzed from the productive zones of Astorga, La Bañeza, La Cabrera, Esla-Campos and Páramo. Their physicochemical characteristics were different by zone, as the texture of soils ranged between sandy loam and silt loam and the pH between strongly acid and slightly alkaline, as well as the organic matter (OM) concentration between low and remarkably high. Total C and N concentrations and their ratio were between medium and high in most of the soils and the rest of the micronutrients had an acceptable concentration except for Paramo’s soil. Both Trichoderma species developed better in AS than in NS, T. velutinum T029 grew better with high levels of OM, total C, ratio C:N, P, K, Fe, and Zn than T. harzianum T059 in clay soils, with the highest values of cation exchange capacity (CEC), pH, Ca, Mg and Mn. These effects were validated by Canonical Correlation Analysis (CCA), texture, particularly clay concentration, OM, electrical conductivity (EC), and pH (physical parameters) and B and Cu (soil elements) are the main factors explaining the influence in the Trichoderma development. OM, EC, C:N ratio and Cu are the main soil characteristics that influence in T. velutinum T029 development and pH in the development of T. harzianum T059.

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The influence of cultivar and soil type on performance of lucerne in the Victorian Mallee

Australian Journal of Experimental Agriculture ◽

10.1071/ea9690428 ◽

1969 ◽

Vol 9 (39) ◽

pp. 428 ◽

Cited By ~ 2

Author(s):

VF McClelland

Keyword(s):

Soil Type ◽

Sandy Loam ◽

Sandy Loam Soil ◽

Soil Types ◽

Research Station ◽

Relative Production ◽

Loam Soil

The production and persistence of nine cultivars of lucerne were studied at the Mallee Research Station, Walpeup, Victoria, over three seasons. Hunter River, Siro Peruvian, and African lucerne were similar in yield, but Siro Peruvian was less persistent. The superior yield of these three cultivars over two accessions of Flandria, Du Puits, and Socheville was largely due to their greater winter production. Two lines of Canadian creeping-rooted lucerne were found to be entirely unsuited to this district. Hunter River and Siro Peruvian lucerne were also compared on a sand and a sandy loam soil at Walpeup. The relative production of the two cultivars was the same on the two soil types but the effect of soil type was marked. The production and persistence of lucerne grown on the sand was far superior to that on the sandy loam.

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Nitrogen fertilization of Cabernet Sauvignon grapevines: yield, total nitrogen content in the leaves and must composition

Acta Scientiarum Agronomy ◽

10.4025/actasciagron.v37i3.19354 ◽

2015 ◽

Vol 37 (3) ◽

pp. 321 ◽

Cited By ~ 3

Author(s):

Felipe Lorensini ◽

Carlos Alberto Ceretta ◽

Cledimar Rogério Lourenzi ◽

Lessandro De Conti ◽

Tadeu Luis Tiecher ◽

...

Keyword(s):

Nitrogen Content ◽

Total Nitrogen ◽

Nitrogen Fertilization ◽

Total Nitrogen Content ◽

Cabernet Sauvignon

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Long-term effect of tillage, nitrogen fertilization and cover crops on soil organic carbon and total nitrogen content

Soil and Tillage Research ◽

10.1016/j.still.2011.05.001 ◽

2011 ◽

Vol 114 (2) ◽

pp. 165-174 ◽

Cited By ~ 141

Author(s):

Marco Mazzoncini ◽

Tek Bahadur Sapkota ◽

Paolo Bàrberi ◽

Daniele Antichi ◽

Rosalba Risaliti

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Nitrogen Content ◽

Total Nitrogen ◽

Cover Crops ◽

Nitrogen Fertilization ◽

Term Effect ◽

Total Nitrogen Content ◽

Long Term Effect

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Evaluation of Root Sink Ability of Sweet Potato (Ipomoea batatas Lam.) Cultivars on the Basis of Enzymatic Activity in the Starch Synthesis Pathway

Journal of Agronomy and Crop Science ◽

10.1111/j.1439-037x.1996.tb00587.x ◽

1996 ◽

Vol 177 (1) ◽

pp. 17-23 ◽

Cited By ~ 7

Author(s):

M. Yatomi ◽

F. Kubota ◽

K. Saito ◽

W. Agata

Keyword(s):

Enzymatic Activity ◽

Sweet Potato ◽

Ipomoea Batatas ◽

Starch Synthesis

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Stress of Four Sweet Potato (Ipomoea batatas (L) Lam.) Genotypes Under Various Light Illumination Levels of Productive Oil Palm Shading

Beccariana Botanical Research Bulletin ◽

10.30862/bbrp.v7i1.272 ◽

2010 ◽

Vol 7 (1) ◽

Author(s):

H. Agusta ◽

A. Setiawan ◽

H. Purnamawati ◽

T. Sugiarto

Keyword(s):

Sweet Potato ◽

Oil Palm ◽

Ipomoea Batatas ◽

Light Transmission ◽

Observation Time ◽

Research Station ◽

Light Illumination ◽

Font Size ◽

Area Index ◽

Number Of Leaves

The purpose of the study was to determine the effect of various oil palm shading levels on the growth and production of four sweet potato genotypes.  The field experiment was conducted at Cikabayan Research Station Bogor  from August 2003 to March 2004. Split Plot Design was arranged  with four sweet potato genotypes (Sukuh, Jago, BB. 96001.2 and BB. 97096.4) as main plots and  four oil palm shading levels (90 %, 79 %, 68 % and 40 %) as sub plots. Shading  with  0 %  level  (100 % of sun light transmission) was used as control. The result showed that oil palm shading levels from 40 %-90 % decreased number of leaves, leaf area index, length of  root and stem in the most of observation time. Sukuh was the most tolerant  genotype to oil palm shading.

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Sweetpotato Tip Rot Incidence Is Increased by Preharvest Applications of Ethephon and Reduced by Curing

HortTechnology ◽

10.21273/horttech.23.3.288 ◽

2013 ◽

Vol 23 (3) ◽

pp. 288-293 ◽

Cited By ~ 4

Author(s):

Ramón A. Arancibia ◽

Jeffrey L. Main ◽

Christopher A. Clark

Keyword(s):

Ipomoea Batatas ◽

Unknown Etiology ◽

Research Station ◽

Storage Root ◽

Storage Roots ◽

Induced Stress ◽

Potential Association ◽

Relationship Of ◽

On Farm

Tip rot, or restricted end rot, is a new sweetpotato (Ipomoea batatas) disease/disorder in Mississippi with unknown etiology. Since pathogen isolations have been inconsistent, a relationship of this disorder with stress is proposed. This disease/disorder is manifested as a restricted lesion at or close to the proximal end of the storage root and appears after 2 to 4 weeks in storage. In many cases, the lesion necrosis expands internally. On-farm and research station studies with preharvest foliar applications of ethephon were conducted in Mississippi to determine the potential association of tip rot with ethephon-induced stress. In addition, the effects of ethephon rate and interval between application and harvest on tip rot were investigated. After 1 to 2 months in storage, tip rot incidence was observed mostly in storage roots from ethephon-treated plants. The increase in tip rot incidence was well correlated with ethephon rate. These results suggest that preharvest applications of ethephon trigger a response that results in the tip rot disorder.

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Effect of Mid-Term Cropping System Adoption on Soil Chemical Properties at Changunarayan Municipality, Bhaktapur, Nepal

Current Research in Agricultural Sciences ◽

10.18488/journal.68.2021.82.80.89 ◽

2021 ◽

Vol 8 (2) ◽

pp. 80-89

Author(s):

Saroj Koirala ◽

Santosh Shrestha ◽

Prashanta Raut ◽

Bikram Pandey ◽

Arbindra Timilsina

Keyword(s):

Organic Matter ◽

Total Nitrogen ◽

Soil Ph ◽

Cropping Systems ◽

C:N Ratio ◽

Chemical Properties ◽

Soil Chemical Properties ◽

Future Research ◽

Available Phosphorus ◽

Wide Range

Soil chemical properties plays a crucial role in crop yield. In this study, we evaluated the chemical properties of soils under three different cropping systems practiced for more than five years in Changunarayan municipality of Bhaktapur district of Nepal. The cropping systems includes- (i) cultivation inside polyhouse (Treatment A: polyhouse), (ii) paddy-wheat rotation (Treatment B: P-W), and (iii) paddy-wheat-vegetable rotation (Treatment C: P-W-V). Thirty-nine composite samples (13 replicates from each site) were taken from the area based on variation in landforms. Soil pH, organic matter (%), total nitrogen (%), available phosphorus (mgkg-1), and available potassium (mgkg-1) were evaluated for each sample. The study revealed that the soil pH was acidic and ranges between 4.71 and 5.39, organic matter (1.6-2.39%), total nitrogen (0.091-0.13%), phosphorus (4.48-29.24mg kg-1) and potassium (88.04-109.52 mg kg-1). A significant lower mean pH (4.71), and higher mean organic matter (2.39%), total nitrogen (0.13%) and available phosphorus (29.24 mgkg-1) were observed in cultivation under polyhouse. Incorporation of vegetable in paddy-wheat system gave significant (p<0.05) higher accumulation of soil phosphorus and consistently raised other nutrient status. Moreover, cultivation under polyhouse raised C:N ratio (10.55) significantly than other system. This finding can be relevant to wide range of readers that focus on soil chemical properties and can be used in developing future research strategy and sustainable soil management system in the area.

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