Establishing optimal nutrient level of magnesium and boron in black pepper for optimization of productivity in Western Ghats of Kerala

Critical nutrient level of magnesium and boron in soil and plant biomass of black pepper (Piper nigrum) have been estimated in Western Ghats of Kerala by conducting field experiments in three seasons (2018-2020) by magnesium and boron fertilization. Nutrient management in black pepper plantations wins important value due to its wider use as spice all over the world. As black pepper plants are easily prone to Mg and B deficiency, its response to Mg in the form of magnesium sulphate and B as borax was evaluated in terms of yield, plant nutrient content and nutrient status in soil. Effect of Mg as well as B application on the other available nutrients and leaf nutrient content were also determined in the study. Response curves were fitted by plotting relative yield of black pepper with Mg and B in soil and index leaf. The graphical method of Cate and Nelson was used to derive the optimal concentrations of nutrients. The critical levels of magnesium in soil and black pepper leaves were established as 140 mg kg-1 and 0.44 % respectively. Optimum dose of magnesium sulphate for getting highest yield of black pepper was found as 120 kg ha-1 followed by MgSO4 @ 80 kg ha-1. Similarly critical limit of B in the soil and index leaf of black pepper were 0.58 and 21 mg kg-1 respectively. The maximum potential yield was obtained by applying boron as borax at 0.2% via foliar application and at a higher dosage of 2 kg per hectare through soil application

Farm evaluation of formulated diets on the growth and body composition of Etroplus suratensis reared in cages in low-saline coastal ponds

A 90-day on-farm feeding experiment was carried out in the installed cages in brackishwater ponds to evaluate the efficiency of three formulated diets on the growth performance and body composition of Etroplus suratensis. Two diets DI and DII were in-house formulations based on optimum macronutrient requirements (protein and fat) derived from an indoor nutritional evaluation of E. suratensis, and diet three DIII was a commercially available pellet meant for pearl spot fish. A sum of 900 fishes were randomly distributed with an average weight of 18.2±0.02g into three different treatment groups each in triplicate, and each replicate had 100 fishes stocked in cages with dimensions 2×2×1.5 m. At the end of the feeding trial, the fish were weighed to assess growth parameters in terms of % gain in weight, feed conversion ratio (FCR), and specific growth rate (SGR). The diet (DI) displayed significantly (p<0.05) higher % weight gain, and SGR than (DII) and (DIII). The FCR of diet (DI) was significantly (p<0.05) lower than diets (DII) and (DIII). Diet (DI) showed better growth when compared with other feeds. The study emphasized the need for species-specific diets for application at the farm level for an effective return on investment

Broodstock development of cobia and snubnose pompano

It is not easy to obtain fully mature broodstock fish directly from the wild and hence broodstock development has to be done in captivity. Fish broodstock may be collected from the wild or captive stock. It is advantageous to collect sub-adults for broodstock development. Larger fishes would have crossed the reproductive age and very small fishes will take longer time to sexually mature. In the case of cobia, fish weighing between 8 to 15 kg could be procured while silver pompano could be procured in weight range of 750 gm to 1.5 kg. Cobia and silver pompano does not have swim bladder as juveniles or adults, and there is no need to vent the fish after captur

Randomised controlled effectiveness study (RCT) of isometric exercise (IE) in adults with stage 1 and 2 hypertension – ISOFITTER study [version 1; peer review: 1 approved]

Background High blood pressure (BP) affects more than one in four adults in England and only one in three patients are being treated effectively. Treatment of high BP includes changes to lifestyle such as more physical activity and/or taking medication. However, low adoption and high attrition rates are common with current large targets for recommended exercise (>150 minutes moderate exercise per week plus 2 strength sessions). Evidence suggests that isometric exercise (IE), holding a fixed body position for a period of time, for example a wall squat, lowers BP a greater amount, with less time and effort, than other recommended exercise. This ISOFITTER study will provide robust effectiveness evidence of IE for hypertension. Methods A multi-centre, randomised, controlled trial of isometric exercise wall squat intervention for hypertension: an effectiveness-implementation hybrid type-1 design. Adults (n=542) with Stage 1 or Stage 2 hypertension, on no more than one antihypertensive, and no other medical contra-indications will be randomised to either a standard care plus IE intervention group or standard care control group. Blood pressure readings, fidelity measurements, medications, adverse events, quality of life, participant satisfaction and health service use will be collected at baseline, week 4, month 3 and month 6 with a subgroup of n=50 invited up to month 12. Qualitative participant focus groups and interviews with wider stakeholders will collect implementation data. Results The ISOFITTER study will establish effectiveness of a self-administered, home IE intervention in lowering blood pressure in people with uncomplicated stage 1 and 2 hypertension. Implementation evidence will support patient delivery, context for scaling up of the intervention and intervention cost. Conclusion Lifestyle changes for the treatment of hypertension in the absence of other risk factors should not be overlooked. For long term hypertension management, easily adopted, evidenced exercise interventions are needed. This study will help to address this evidence gap

Multi-proxy evidence for an arid shift in the climate and vegetation of the Banni grasslands of western India during the mid- to late-Holocene

Tropical semi-arid grasslands are a widespread and ecologically and economically important terrestrial biome. Here, we use paleoecology to understand woodland–grassland transitions across the mid- to late-Holocene period in the Banni grassland, western India. Multi proxy analyses involving palynology, phytoliths and elemental geochemistry were carried out on two sediment cores retrieved from wetlands (Chachi and Luna), to understand temporal fluctuations in vegetation, moisture availability and other environmental parameters. Based on the results, the Chachi core was divided into two major climatic phases. Phase 1 (4600–2500 cal. yr BP) was characterised by high precipitation and abundance of pollen types and phytolith morphotypes that indicate the presence of woody savanna, and mesic herbaceous taxa. Phase 2 (2500 cal. yr BP to the present) was characterised by lower precipitation, lower abundance of mesic taxa and an increase in grass phytolith abundance. However, the period from ~1000 cal. yr BP to the present was characterised by the increased abundance of leguminous taxa, dryland herbs/shrubs and a decline in grass phytolith abundance. The Luna core (~1000 cal. yr BP to the present) also showed results matching with the Chachi core for this latter period. Overall, moisture availability in the ecosystem appears to have declined since 4600 cal. yr BP, and the vegetation has responded to this. Although the balance between tree, shrub and grass elements has fluctuated, overall, the region has remained as an open ‘grass and shrub savanna’ with sparse woody vegetation throughout this period. Our study provides insights into the vegetation dynamics and environmental settings in a poorly understood tropical arid-grassland ecosystem from Asia during the mid-late-Holocene

Observation of γγ → ττ in proton-proton collisions and limits on the anomalous electromagnetic moments of the τ lepton

The production of a pair of τ leptons via photon–photon fusion, γγ → ττ, is observed for the f irst time in proton–proton collisions, with a significance of 5.3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb−1. Events with a pair of τ leptons produced via photon–photon fusion are selected by requiring them to be back-to-back in the azimuthal direction and to have a minimum number of charged hadrons associated with their production vertex. The τ leptons are reconstructed in their leptonic and hadronic decay modes. The measured fiducial cross section of γγ → ττ is σfid obs = 12.4+3.8 −3.1 fb. Constraints are set on the contributions to the anomalous magnetic moment (aτ) and electric dipole moments (dτ) of the τ lepton originating from potential effects of new physics on the γττ vertex: aτ = 0.0009+0.0032 −0.0031 and |dτ| &lt; 2.9×10−17ecm (95% confidence level), consistent with the standard model