Stevia Leaf biomass yield PUE P requirement Critical P content Knowledge of phosphorus (P) uptake and its use efficiency by crop plants is essential for adequate management of the plant nutrients to sustain food production with a minimal environmental impact. To study the effects of P on the growth, leaf biomass production, P content and uptake and to estimate P use efficiency (PUE), minimum P requirement and critical leaf P content of stevia, a pot experiment was conducted in the net house of the Department of Agricultural Chemistry, Bangladesh Agricultural University following completely randomized design (CRD) with three replications in acid and non-calcareous soils of Bangladesh. The applied treatments was six viz. 0 (P0), 25 (P25), 50 (P50), 75 (P75), 100 (P100) and 150 (P150) kg P ha-1. Plant samples were collected at 15 days interval to obtain different parameters. Collective results indicated that significantly highest values of different parameters were obtained with P @ 100 kg ha-1 and the lowest from P control. Phosphorus application increased leaf dry yield at harvest by 55 to 510% in acid soil and 70 to 488% in non-calcareous soil over control. The rapid growth of the plant was recorded at the later stages (30 to 60 days after planting). Phosphorus content and uptake was directly proportional with the increased levels of P except the treatment P150 in both soils. Maximum PUE and fertilizer P use efficiency (FPUE) was observed at P100 treatment. Critical P content was estimated to be ca 0.19 and 0.30% in the leaves of stevia plants grown in acid and non-calcareous soils, respectively. For maximum leaf biomass production of stevia grown in acid and non-calcareous soils, the minimum requirement of P was also estimated to be ca 109 and 104 kg ha-1 , respectively. The information of this finding would contribute to optimize the soil P use and improve fertilizer management for stevia cultivation. To cite this article: Maniruzzaman M, T Chowdhury, MAH Chowdhury and MA Rahman, 2017. Phosphorus use efficiency and critical P content of stevia grown in acid and non-calcareous soils of Bangladesh. Res. Agric. Livest., Fish., 4 (2): 55-68. Maniruzzaman et al. Phosphorus use efficiency and critical P content of stevia Res.
Phosphorus (P) deficiency is invariably a common crop growth and yield-limiting factor in unfertilized soils, especially soils high in calcium carbonate, which reduces P solubility. Even when such soils are fertilized, adsorption and desorption lead towards a reversion to stable and less soluble P forms, thus reducing fertilizer use efficiency. Field trials that examine the implications of such P reactions and residual fertilizer P responses in the field are relatively rare in Mediterranean environments. A 5-year field experiment in southern Turkey examined the residual effects of repeated P fertilizer applications for corn production in a calcareous soil Typic Xerofluvent. Following the initial year's fertilization (0, 33, 66 and 99 kg P ha À1 ) to establish a range of soil P levels in subsequent years, the main plots received 0, 9, 18, 27 and 36 kg P ha À1 annually. Grain P uptake was calculated for each year and used in the prediction of P recovery. All plots were sampled and analyzed for available P prior to planting with a local corn hybrid. Soil P values increased with the initial P levels (8-24 mg kg À1 ) but declined after 3 years (6-10 mg kg À1 ). Only the lowest annual P application rate (9 kg P ha À1 ) produced an available P level that was not in the sufficiency range. Grain yields across the main and subplots and years ranged from 6.6 to 13.2 t ha À1 . Overall corn yield averaged over the years increased by 8-33% compared to the control as the rates of applied P increased. However, P application had no effect in a year when below-average rainfall restricted crop growth. A residual P effect on grain yield occurred with higher P application levels in the last year. Leaf and grain P concentrations were in the sufficiency range in general. Grain P uptake was calculated for each year and used in the prediction of P recovery. Actual recovery was higher with low P application rates and ranged between 10.8 and 46.4%. The study indicated that under irrigated conditions, corn is likely to respond to P fertilization, but that buildup of available P can occur within a few years and adequate plant available P levels can be maintained by modest P fertilizer application rates.
Background: Goldenberry (Physalis peruviana L.) is one of the most promising exotic fruits in terms of its biological capacity. Objective: In this work, ethanol extracts of the different parts (fruit, seed, root, body and leaf) of the P. peruviana were investigated in terms of their antioxidant and antimicrobial activity. Furthermore total phenolic and flavonoid contents, phenolic analysis and volatile compound analysis were exhibited. Method: Total phenolic and flavonoid contents were calculted as gallic acid and quercetin equivalent respectively. Antioxidant activity were studied based on DPPH free radical scavenging activity. Antimicrobial activity were determined by disc diffusion method against several bacteria, a fungi and a yeast. Analysis for phenolic and volatile compounds were exhibited by using HPLC and GC-MS respectively. Results: The values obtained for the total phenolic and flavonoid contents and SC 50 values calculated for DPPH scavenging activities were compatible with each other. Extract prepared from the seed had the highest phenolic (4.956±0.001 mg GA/g sample) and flavonoid content (0.737±0.034 mg QE/g sample). Gallic acid and ferulic acid were detected in all extracts. The most volatile species (190 pieces) detected in root extract. Seed and fruit were the most effective parts of the P. peruviana in terms of their antimicrobial activity. Conclusion: According to obtained results it has been demonstrated that P. peruviana from Trabzon had good useful properties for human health and it would be useful to carry out further researchs on it.
Salt stress is the most significant constraint for agricultural production in arid and semi-arid regions. Thus, genetically improved stresstolerant varieties are needed for the future. The identification of salt-tolerant genotypes is the starting point for such breeding studies. This study was conducted to determine and assess the tolerance of different watermelon genotypes under saline conditions. Twenty-two watermelon genotypes and accessions were grown in pots with 3 kg of soil in four saline stress conditions (0 mmol kg -1 as the control, 25, 50 and 100 mmol kg -1 NaCl). The detrimental effects of salt stress on the plants were evident with increasing doses of NaCl. Stress indices calculated over the plant dry weights under the 100 mmol kg -1 salinity level were used to assess the salt tolerance of the genotypes. Stress intensity was calculated as 0.76. Such a value indicated that the highest dose of salt exerted severe stress on the plants. The G04, G14 and G21 genotypes were considered to be salt tolerant, since these genotypes showed the highest values of K/Na and Ca/Na ratios in the plant tissue. The losses in dry mass at severe salt stress reached 75.48%. In principal component analyses, the genotypes had positive correlations with stress tolerance indices of MP (mean productivity), GMP (geometric mean productivity) and STI (stress tolerance index). The GMP and STI indices indicated that G04 (a member of Citrullus colocynthis), G14 and G21 could be prominent sources to develop salt tolerance.Index terms: Citrullus lanatus; local varieties; stress tolerance attributes; tolerance for salt stress. RESUMOO estresse salino é a restrição mais importante para a produção agrícola em regiões áridas e semi-áridas. Portanto, há necessidade de plantas geneticamente tolerantes ao estresse salino no futuro. Identificação de genótipos tolerantes ao sal é o ponto de partida de estudos de melhoramento. O presente estudo foi conduzido para determinar e avaliar a tolerância de diferentes genótipos de melancia sob condições salinas. Um total de 22 genótipos e acessos de melancia foram cultivados em vasos de 3 kg de solo com quatro condições de estresse salino diferentes (0 mmol kg -1 como controle, 25, 50 e 100 mmol kg -1 de NaCl). Dependendo do aumento da dose de NaCl, os efeitos prejudiciais do estresse salino nas plantas também aumentaram. Os índices de estresse calculados sobre os pesos secos das plantas com um nível de salinidade de 100 mmol kg -1 foram utilizados para avaliar a tolerância ao sal dos genótipos. A intensidade de tensão foi calculada como 0.76. Indicando que a maior dose de sal exerce um estresse salino grave nas plantas. Os genótipos G04, G14 e G21 foram considerados tolerantes, uma vez que apresentaram os maiores valores nas relações K/Na e Ca/Na. As perdas em pesos secos com estresse salino grave atingiram 75.48%. Na análise de componentes principais, os genótipos tiveram correlações positivas com os índices de tolerância ao estresse de PM (produtividade média), GMP (produtividade média geomé...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.