Naveen Leno - Academia.edu (original) (raw)

Papers by Naveen Leno

$Research paper thumbnail of Carbon fractions of fortified thermochemical organic fertilizers and their response on the yield of okra and tomato$

Journal of Environmental Biology, 2021

Aim: To study the carbon fractional status of the growing media and to find out the best organic ... more Aim: To study the carbon fractional status of the growing media and to find out the best organic nitrogen source for fortification of thermochemical organic fertilizer, the manurial constituent of growing media for container cultivation of okra and tomato. Methodology: Container cultivation of okra and tomato were done in completely randomised design. Treatments included fortification with farmyard manure, neem cake, groundnut cake, poultry manure, vermicompost, coir pith compost, hatchery waste organic fertilizer, urea and unfortified thermochemical organic fertilizer. Carbon fractions, viz. total organic carbon, permanganate oxidisable labile carbon, microbial biomass carbon and soil respiration of the growing media were analysed. The yield and yield attributes of the crops were determined. Results: Irrespective of the organic source of nitrogen used, the fortified thermochemical organic fertilizer imparted a high status of total organic carbon to the growing media. Fortification ...

Science of The Total Environment

International Journal of Current Microbiology and Applied Sciences, 2021

The present study investigated the effect of different nutrient management practices on soil C fr... more The present study investigated the effect of different nutrient management practices on soil C fractions, growth and yield of fodder maize variety- African tall. The treatments were seven in number - T1: POP recommendation, T2: Soil test based POP, T3: Organic nutrient management using TOF-F, T4: POP + AMF, T5: Soil test based POP + AMF, T6: Organic nutrient management + AMF, and T7: Absolute control. Among the soil C fractions, highest TOC content was recorded by T3 which was on par with T5 and T6 and highest DOC content was observed for T1 at both levels of sampling depths. The soil labile and recalcitrant fractions followed same trend at both levels of depth of sampling i.e. T5 was found to be superior which was on par with T6. The highest value for shoot weight, root volume, green fodder and dry fodder yield was observed in treatment T5 which was on par with T4. The root weight was higher for organic nutrient and AMF combination treatment – T6 (50.23 g/plant). The results indica...

Waste Management, 2021

Thermochemical digestion is a rapid technology of biowaste management resulting in the instant pr... more Thermochemical digestion is a rapid technology of biowaste management resulting in the instant production of organic fertilizer. Characterization and assessment of its suitability as an organic fertilizer is essential for recommendation for crop application. Biowaste and the thermochemical digestate were subjected to physicochemical and biochemical characterization and the compost maturity parameters assessed. The product integrated with inorganic fertilizers was tested in an Ultisol grown with banana in comparison with farmyard manure based fertilizers. Temporal variation in soil reaction, water holding capacity, carbon dynamics, dehydrogenase activity and plant biomass were determined. The thermochemical digestate fertilizer had a bulk density (0.76 Mg m-3), pH (neutral), C:N ratio (16.26), CEC (85.70 cmol(+) kg-1), CEC/ TOC ratio (3.99), Fertilizing index (4.7) and a Clean index (5.0). Field evaluation revealed enhanced water holding capacity (38.75-83.17%). Total carbon increased with consistently high labile (R2 = 0.9551) and non labile carbon fractions and the lowest average lability index (0.78). Dehydrogenase activity at harvest enhanced by 72.81%. An even biomass allocation resulted in 38.84% more biomass production in the fruit over farmyard manure based treatments. In addition to ensuring the safety of the environmental ecosystem, the thermochemical digestate conformed to be a quality resource favoring microbial proliferation and carbon sequestration, thereby restraining carbon dioxide emission. The thermochemical digestate fertilizer based nutrition serves the key deliverables of natural resource management, ecofriendly rapid disposal of biowaste and quality organic fertilizer for banana in Ultisols.

International Journal of Chemical Studies, 2020

The abnormally high rainfall received in Kerala from 1 June 2018 to 19 August 2018 resulted in se... more The abnormally high rainfall received in Kerala from 1 June 2018 to 19 August 2018 resulted in severe flooding in 13 out of 14 districts in the state. Due to this heavy rainfall, flooding occurred in Kerala state and devastated most of the crops. The cumulative rainfall realised during 15-17 August 2018 resulted in a total of 414 mm for Kerala state with Idukki receiving 700 mm rainfall falling next to Peermade which received the highest rainfall of 800 mm. The paper focused on the effects of flooding on soil quality in southern high hills (AEU 14) of Idukki district, Kerala, for proper soil and flood management to avert soil degradation. The organic carbon content and the content of the available major primary nutrients nitrogen, phosphorus and potassium in these soils were determined. Survey was conducted to identify the flood affected areas of AEU 14 in Idukki district and details were collected. Representative surface soil samples (0-20 cm) were collected from these locations of AEU 14. Majority of the soils are high in organic carbon (70.5%), 25.6% samples recorded medium. Only 3 samples out of 78 samples were low.

Physicochemical characterization and a 300-day soil incubation was conducted to study the effect ... more Physicochemical characterization and a 300-day soil incubation was conducted to study the effect of a thermochemical organic fertilizer (TOF) produced from biowaste through rapid thermochemical processing technology on soil properties and nutrient release pattern at the Kerala Agricultural University, India. A field experiment to study the effect of TOF on the growth and yield of banana (Nendran) was conducted. The physicochemical properties of TOF were conforming to prescribed quality standards. The TOF imparted moderation of acidity, lower soluble salts and a steady and constant release pattern of organic carbon on incubation. Mineralized nitrogen dynamics was superior in TOF combined with Plant Growth Promoting Rhizobacteria, characterized by a 120-day cycle of net nitrogen mineralization on 10 days and a net immobilization on 20 days. Highest P mineralization was recorded at 150 days with a phase of total immobilization from 180 to 240 days. Mineralization and immobilization up ...

International Journal of Current Microbiology and Applied Sciences

Advances in Research

An investigation was carried out at the College of Agriculture, Trivandrum, Kerala, India to eval... more An investigation was carried out at the College of Agriculture, Trivandrum, Kerala, India to evaluate the suitability of an organic fertilizer produced by rapid chemical decomposition of organic waste as a substitute for farmyard manure for banana cultivation with reference to its effects on soil properties, nutrient availability and dry matter production. A field experiment for 11 months duration was conducted in banana (Musa spp. variety Nendran) in Randomized Block Design with eight treatments with three replications. The treatments were selected to compare conventional farmyard manure based and soil test based fertilizer recommendations with those of the newly produced rapid organic fertilizer. Treatments to study the combined effect were also included. Fertilizers were applied basally and in six split doses in accordance with the recommended package of practices. The fresh weight of the pseudostem, leaves, fruits and rhizome were recorded at harvest and dry Original Research Article matter production computed after oven drying the samples. The study revealed that the substitution of farmyard manure with rapid organic fertilizer imparted a better buffering action to soil with only 51.43% decline in pH, without significant changes in electrical conductivity and ensured a steady supply of major nutrients during the active growth stages of the crop. Total and fruit dry matter production also differed significantly. Hence it can be inferred th rapid thermochemical decomposition of solid wastes can substitute farmyard manure for banana cultivation.

$Research paper thumbnail of Dynamics of potassium fractions under submergence in characteristic sandy clay and loamy sand rice soils of Kerala$

International Journal of Chemical Studies, 2019

A laboratory incubation study was carried out at the College of Agriculture, Vellayani to monitor... more A laboratory incubation study was carried out at the College of Agriculture, Vellayani to monitor the dynamics of native as well as applied K in the two representative soil types-lateritic alluvium of Pattambi (Kandiaqult) and Onattukara sandy soils (Quartzipsamment) as influenced by a flooded moisture regime. The experiment was carried out at two levels of K-0 and 45 kg K2O ha-1. Wet soil samples were drawn at periodic intervals and analysed for water soluble, exchangeable, available, nitric acid soluble, fixed and lattice bound fractions of potassium. A gradual decrease in water soluble K fraction was observed after 15 days of submergence in Pattambi soils and after 20 days in Onattukara soils. Onattukara soils recorded higher values of water soluble K fraction as compared to Pattambi soils. But exchangeable and available K fractions were higher in Pattambi soils than in Onattukara soils. The decrease in available K with submergence observed in Pattambi soils is attributed to potassium fixation in the soil which is not noticed in Onattukara soils. At higher level of added K statistically significant increase in the HNO3-K fraction was observed on the 50 th day of submergence in Pattambi soils. Significant increase of fixed potassium was observed after 30 days of submergence (284.4 mgkg-1) and then again on 50 days of submergence (290.6 mgkg-1) in Pattambi soils. There was no significant change in the fixed potassium fraction in Onattukara soils. Neither the added K nor the period of submergence could bring about a change in the clay mineral lattice which accommodates the lattice K fraction.