Arup Sen

Bidhan Chandra Krishi Viswavidyalaya | BCKV · Department of Agricultural Chemistry & Soil Science

AimsCluster roots release carboxylic acids, especially citric acid, into the rhizosphere. We investigated how the citrate ion and the acidity interact to release phosphate. Methods We prepared solutions with differing citrate concentrations and differing pH and mixed these solutions with a soil. We investigated the effects of: pH, duration of mixin...

AimsMany soil scientists think that soil phosphate exists as discrete compounds of iron, aluminium and calcium and, accordingly, use chemical fractionation schemes to identify these compounds.Methods We reacted a sample of goethite and a sample of aluminium oxide with a phosphate solution under conditions chosen to facilitate penetration of phospha...

The rate at which phosphate continues to react with soil is an important determinant of its effectiveness as a fertiliser. Yet it has seldom been measured and we do not know which soil properties affect its value. Here, the effects of electric charge are investigated. The charge of a low phosphorus status soil was changed both by changing the soil...

Aims Many soil scientists think that soil phosphate availability is highest at near-neutral pH and decreases with decreasing pH. This belief does not appear to have ever been subjected to experimental test. Methods In a pot trial, we measured response curves to phosphate at seven pH(CaCl2) values ranging from 3.99 to 7.26 using three plant species:...

Acid soils (0-20 cm) from five different locations namely Jibanpur, Kamalpur, Washabarie, Hansqua (from the state of West Bengal) and Padu (Meghalaya) were collected to evaluate the efficiency of organic acids in dissolving phosphorus which was conducted in the laboratory. The extracted P by different organic acids varied from soil to soil and leas...

This present study explores how various microbial consortia, comprising of seven plant growth promoting microorganisms (PGPMs) isolated from the rhizosphere of lentil crops in Indo-Gangetic plains, affect the growth and yield of lentil in laboratory and greenhouse environments. Findings reveal that the microbial consortium containing Rhizobium puse...

Unlabelled: Phosphorus (P) is the key to several structural molecules and catalyzes numerous biochemical reactions in plant body besides its involvement in energy transfer. Any deficit in P availability is likely to result in reduced RNA and protein content, inhibiting crop growth and development. Thus, availability of soil P is extremely crucial...

Green gram is an excellent pulse crop with high economic and nutritional values. Optimal water and nutrient application can boost yield, water productivity, nutrient use, energy indices, and economic gains. The field experiment comprising three irrigation schedules (one irrigation at pre-flowering, two irrigations at pre-flowering and pod formation...

Soil salinity and sodicity are the major problems, especially in arid and semi-arid regions of the world. Adverse land topography, impeded drainage lines, heavy deep textured soil, toxic salt accumulation, climate change and poor resource base and mobilisation are the major constraints, which continue to degrade the soil's physical, chemical and bi...

High rainfall areas suffer from severe leaching loss of sulfate owing to their negatively charged nature. Sorption of sulfur (S) onto soil particles protect it from leaching out of the system. The S-sorption characteristics in humid soils from northeastern India was studied with the objective to identify factors controlling S-sorption behavior in t...

A field experiment was conducted at research farm of Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, during 3 consecutive summer seasons of 2017, 2018 and 2019, to find out the influence of varietal differences and nutrient-management practices on crop productivity, soil fertility and economics in groundnut (Arachis hypogaea L.). The e...

Changes in land use practices may affect the distribution of soil sulfur (S) fractions and their bioavailability. Therefore, this study was undertaken to assess the influence of different land use changes on the distribution of soil S fractions and their bioavailability for plant nutrition. Soil samples from farmers’ fields with different land use...

Lentil, which is an important grain legume, can be co-inoculated with plant growth-promoting rhizobia and rhizobacteria to boost nitrogen fixation, increase biomass, and a possibility for early nodulation. The goal of the ongoing study was to identify plant growth-promoting rhizobacteria (PGPR) in the rhizosphere of lentil growing soils in eastern...

The saline and sodic soils are vital natural resources in the arid,semiarid, and coastal regions of the world. Its importance is increasingly recognized due to immense pressure on cultivated land for additional food production toward mitigating demand for escalating population growth. The inherited and human-induced many biotic and abiotic stresses...

Indiscriminate application of inorganic chemicals has resulted in soil health deterioration and decline in crop produce in nutrient poor Alfisols of India. We conducted an experiment to find out the influence of different level of inorganic fertilizer and bio-formulations on nutrient uptake, crop growth and productivity of kharif groundnut in the R...

Aims: Phosphorus (P) and zinc (Zn) are essential nutrients for plant growth, and their interaction can significantly influence nutrient uptake and crop productivity. Understanding the optimal balance between P and Zn is crucial for efficient fertilization strategies, especially in soils with low P status. This study aimed to investigate the impact...

Aims The effectiveness of phosphate fertilisers decreases with increasing period of reaction. One explanation for this is that the phosphate (P) has changed its chemical form. Evidence for this is provided by fractionation schemes which include extraction with alkali, followed by extraction with acid. Our aim was to test whether alkali and acid ext...

With the growing problems of wastewater generation, we have to redress their effective disposal- Rice mill wastewater (RMW) is one of them. According to data provided by CPCB (2008), about 60,000 parboiled rice mills are working in India releasing approximately 12 × 109 L of effluent per year. This rice mill wastewater (RMW) contains nutrient eleme...

The effect of reaction between soil and phosphate on pH has not previously been explored or explained. We incubated samples of a soil with calcium carbonate to give a range of from 4.2 to 7.2, and then measured the change in pH when these samples were reacted with phosphate solutions. These solutions were at the same pH as the soil to which they we...

Mycorrhizal inoculant is one of the options to increase the nutrient availability in soil which ultimately increases the crop yield. The effect of various mycorrhizal inoculants on plant growth and nutrient status in Kharif rice was studied at ‘C’ block farm of Bidhan Chandra Krishi Viswavidyalaya, Kalyani, West Bengal, India. The soil was was typi...

Abstract Potassium is an essential macronutrient for plant growth and development. Intensive cultivation and imbalanced use of fertilizers resulting decreased availability of potassium content of Indian soils. Contrarily, the Indian soils are rich with potassium containing minerals, but in reserve insoluble forms which are very slowly released to t...

Inoculation with effective Rhizobium strains is an essential practice that helps the plant to fix atmospheric nitrogen symbiotically and stimulates the growth of plants and ultimately leads to better produce. In this present study, the Rhizobium strains were isolated from the root nodules of lentil plants form Murshidabad district of West Bengal, u...

The present dissertation work was undertaken to study the depth wise distribution of boron in some soils of red & laterite zone of West Bengal. Soil samples were collected from five representative locations from three different depths (15cm, 30 cm and 45cm) randomly and analyzed to study the status of B and its different fractions and the relations...

We aimed to evaluate the extractability of two reagents viz.0.15% CaCl 2 & 0.01M Ca (H 2 PO 4) for sulphur along with the sulphur availability index of mixed red and black soils. For this 86 soil samples were collected from mixed red and black soil regions and extracted with these solutions. Results showed that both these solutions extracted nearly...

In the present investigation, various forms of sulphur (S) viz., total S, organic S, inorganic S and available S were estimated in soils under four different land uses viz., Rice-rice, rice-green gram, mango orchard and a fallow. Soils samples were taken up to a profile depth of 0.60m at 3 depths i.e. 0-0.20m, 0.20-0.40m and 0.40-0.60m. Thesoils we...

Zinc (Zn) deficiency is a fairly wide spread agronomic constraint in many of the world rice production regions. Information on soil Zn distribution is essential for understanding its chemical reactions and bioavailability. In this backdrop, we tried to find out the relationship between physic-chemical properties and DTPA-extractable Zn (available Z...

Attempts were made to isolate potasium solubilizing bacteria (KSB) from rhizosphere soil of different crops in Nadia district of West Bengal. A total of ten bacteria isolates were tested for K solubilization and characterized up to genus level based on morphological and biochemical characters. Among the ten isolates, six were gram positive rods bel...

Chemical deterioration of soils is a type of soil degradation that involves loss of nutrients or organic matter, salinization, acidification, soil pollution and fertility decline. The removal of nutrients reduces the capacity of soils to support plant growth and crop production and causes acidification. In arid and semi-arid areas problems can aris...

We evaluated the fertility status of rice growing soils under three land types, i.e. upland, medium land and lowland. Composite soil samples were collected from 74 different locations covering the three land types. Results showed that the soils of upland were low in available nutrient (N, P, K and S) contents and the soils of lowland had comparativ...