Browsing by Author "Akhila Nand Dubey"

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Differential responses of rice (Oryza sativa L.) to foliar fertilization of organic potassium salts
(Bellwether Publishing, Ltd., 2020) Arnab Kundu; Priyankar Raha; Akhila Nand Dubey; Mukta Rani; Alpana Paul; Ruby Patel
Citric acid, gluconic acid, and humic acid are effective biostimulants and potassium salts of these organic acids are evidenced to have positive impacts in plant nutrition. This experiment aimed to compare the performances of organic potassium salts, viz. potassium citrate (C), potassium gluconate (G), and potassium humate (H) with commercially available inorganic potassium salt on submerged rice. Treatments included foliar application of three organic potassium salts (C, G, and H) and foliar or soil application of inorganic potassium sulfate (S), alone or in combination, with different doses. Foliar application of organic potassium salts resulted in enhanced plant height (1.6%), chlorophyll content (11.6%), grain yield (6.9%), and nutrient uptake (N, P, K, and S) by rice than inorganic K2SO4. Conjoint application of H (half of RDF-K as foliar spraying) and S (half of RDF-K as soil application) obtained highest straw (22.4 g/kg soil) and grain yield (5.6 g/kg soil). Moreover, potassium humate performed best among the different potassium salts used and significantly enhanced the number of leaves, root biomass, and nutrient uptake. This study confirmed the growth promoting attributes of organic potassium salts by improving yield and nutrient uptake of submerged rice. © 2020 Taylor & Francis Group, LLC.
Impact of Source and Method of Potassium Application on Dry Matter Accumulation and Partitioning of Potassium in Rice (Oryza sativa L.)
(Springer Science and Business Media Deutschland GmbH, 2021) Arnab Kundu; Priyankar Raha; Akhila Nand Dubey
The experiment was carried out to assess dry matter accumulation and potassium partitioning in submerged rice upon application of three organic potassium salts, viz., potassium citrate (KC), potassium gluconate (KG), and potassium humate (KH), and inorganic salt, potassium sulfate (KS). Treatments included recommended dose of potassium (RDF-K, 60 kg ha−1) via foliar or soil application of KS, alone or in combination with foliar application of three organic potassium salts (KC, KG, and KH), in three split doses at three rice phenological stages, viz., tillering, panicle initiation, and early flowering. Solely foliar application of organic K salts resulted in 76% K uptake in rice straw compared with 13% K uptake in grain, which diminished internal use efficiency (IUE) and partial factor productivity (PFP) of K. Conjoint application of KS (half of RDF-K as soil application) and KH (half of RDF-K as foliar spraying) obtained highest grain K accumulation and significantly enhanced IUE and PFP of K. KH performed best among the different K salts used and significantly enhanced root dry matter which resulted in significantly highest grain N and P uptake. This study confirmed that organic salts of K altered dry matter and K partitioning, and soil application of KS (half of RDF-K) in combination with foliar application of KH (half of RDF-K) at three growth stages elevated K utilization efficiency of submerged rice. © 2021, Sociedad Chilena de la Ciencia del Suelo.
Variation in Soil Microbial Population and Soil Enzymatic Activities Under Zincated Nanoclay Polymer Composites (ZNCPCs), Nano-ZnO and Zn Solubilizers in Rice Rhizosphere
(Springer, 2021) Akhila Nand Dubey; N. Chattopadhyaya; Nintu Mandal
Zinc deficiency is a major problem in production of rice crop, resulting in low grain Zn content. Use efficiency of conventional Zn sources (ZnSO4·7H2O) is very low. Therefore, technological interventions for increasing Zn use efficiency need to be explored. Nanoformulations of Zn, i.e. zincated nanoclay polymer composites (ZNCPCs), nano-ZnO (foliar application) and zinc solubilizer (Azospirillum brasilense), were compared with ZnSO4·7H2O (soil and foliar application) in rice (Oryza sativa var. Rajendra Mahsuri) rhizosphere at various phenological growth stages (maximum tillering, panicle initiation and harvesting). Effect of various Zn carriers on soil microbial population, enzymatic activities, DTPA-Zn content and Zn uptake was documented in pot experiment in Zn-deficient soil (DTPA-extractable Zn 0.48 mg kg−1). DTPA-extractable Zn content in soil at harvesting stage was found to be maximum in T6 (3.50 mg kg−1) followed by T4 (3.46 mg kg−1). Microbial population (bacteria, actinomycetes, fungi and zinc-solubilizing bacteria) was recorded to be highest in T4 (RDF + Azospirillum brasilense) followed by T6 (ZNCPC) at panicle initiation, maximum tillering and harvesting stages. Dehydrogenase activity was higher at maximum tillering stage in T6 (ZNCPC) followed by that in T4. Acid and alkaline phosphatase activities were found to be maximum at panicle initiation stage in T6 followed by T4 treatment. ZNCPC and zinc solubilizers stimulated soil microbial population consequently increasing the soil enzymatic activities and resulted in release of DTPA-extractable Zn in the rice rhizosphere. Maximum zinc uptake was recorded in treatment T6 (ZNCPC) Zn (303.42 mg kg−1). ZNCPC proved to be a promising fertilizer in increasing Zn use efficiency in rice rhizosphere. Findings of the present investigation need to be further evaluated in long-term field experiment to identify its cost/benefit ratio. © 2020, NAAS (National Academy of Agricultural Sciences).