Potassium Requirements Research Articles

Nutritional Balance of Sugarcane Varieties Under Irrigation Depths and Nitrogen Fertilization

ABSTRACT Nutritional homeostasis is essential if there is to be a balance in the nutritional balance, i.e. the requirement and export of nutrients by plants. This study aimed to evaluate the nutritional balance through the export and requirement of nutrients in sugarcane varieties under different irrigation depths and doses of nitrogen fertilization. The experiment was conducted for two consecutive years. The experimental design was randomized blocks in a subdivided strip scheme with four replications. The treatments consisted of four irrigation depths (L1 = 12, L2 = 45, L3 = 100, and L4 = 125% of crop evapotranspiration (ETc), plant cane), and (L1 = 10, L2 = 40, L3 = 100, and L4 = 125% of ETc, 3w), four doses of nitrogen (N1 = 0, N2 = 50, N3 = 100, and N4 = 200 kg ha−1 of N) and two varieties of sugarcane (RB92579 and RB002754). Homeostasis was positively influenced by the increase in irrigation depth, and the opposite occurred with the nitrogen doses applied. The export and demand for plant cane and ratoon cane are influenced by irrigation depths. Certain cane varieties have varying effects on the requirement for nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur. Increasing nitrogen doses can reduce the export of phosphorus and magnesium.

Nitrogen, phosphorus, and potassium requirements to improve Sideritis cypria growth, nutrient and water use efficiency in hydroponic cultivation

Medicinal and aromatic plant (MAP) production is gaining popularity for industrial agriculture, with phytochemical compounds having a significant impact on human health. Plant fertilization must be carefully considered as it is strongly affecting the biochemical profile of MAPs. The present study examined the Sideritis cypria responses to different nitrogen (N: 75, 150, and 300 mg/L), potassium (K: 150, 350, and 550 mg/L), and phosphorus (P: 50, 75, and 100 mg/L) concentration in the nutrient solution (NS) in hydroponics. The NPK levels (150 mg N/L; 75 mg P/L and 350 mg K/L) in the NS, which was regarded an intermediate fertilization scheme, showed a rise in nutritional value with high phenols, flavonoids and antioxidant activity in plants. S. cypria grown in N75 levels revealed a decreased plant fresh weight and chlorophylls content while plants grown in N300 levels revealed increases in mineral accumulation, nutrient and water use efficiency. The NPK and the K550 levels caused oxidative stress as demonstrated by the raised lipid peroxidation and the stimulation of enzymes’ antioxidant activities. The P50 levels in the NS, increased the plant biomass and water use efficiency (WUE) and revealed the lower oxidative stress (malondialdehyde) and increased enzymes antioxidant (superoxide dismutase and peroxidase) activities. As a result, modifying the NS composition in hydroponic culture for S. cypria by using P levels of 50 mg P/L, higher biomass, nutritive value and WUE can be obtained.

Critical potassium concentrations for the initial cultivation of Cedrela fissilis Vell

ABSTRACT Providing nutrients in optimum quantities is essential for increasing the productivity of timber species. Despite this, we know little about the actual potassium (K) requirements of native Amazonian Forest species. This study aimed to determine the critical level of K deficiency and toxicity for the initial cultivation of cedar. We grew Cedrela fissilis seedlings in a nutrient solution under the effect of five concentrations of K (0, 1, 2, 5, and 8 mmol L -1 ) in a completely randomized design with five replications. After 30 days, we evaluated the relative growth rate, dry mass production, proline content, symptomatology, macro and micronutrient content and accumulation, and K absorption and utilization efficiencies. Concentrations of K positively influence the growth, accumulation, and content of nutrients in the dry mass of the aerial part of young cedar plants. Providing varying amounts of potassium significantly affects the nutritional and growth parameters of Cedrela fissilis seedlings. Potassium doses of 3.5 - 4.00 mmol L -1 in the growing substrate led to better nutritional status (26.08 - 27.28 g kg -1 of K) and plant growth.

Mineral nutrition for Cannabis sativa in the vegetative stage using response surface analysis.

Cannabis cultivated for medical and adult use is a high-value horticultural crop in North America; however, we lack information on its optimal mineral nutrition due to previous legal restrictions. This study evaluated the mineral requirements of nitrogen (N), phosphorus (P), and potassium (K) for cannabis in the vegetative stage using response surface analysis. Plants were cultivated in a hydroponic system with various nutrient solution treatments (mg L-1) of N (132.7, 160, 200, 240, and 267.3), P (9.6, 30, 60, 90, and 110.5), and K (20.8, 60, 117.5, 175, and 214.2) according to a central composite design. Nutrient interactions (N × K, K × P, and N × P × K) had a significant effect on the vegetative growth of the cannabis plants. N × K interaction had a significant effect on leaf mass and stem mass. K × P interaction had a significant effect on dry root mass, leaf mass, stem mass, leaf area, specific leaf area, and chlorophyll a and b contents. N × P × K interaction had a significant effect on root mass, leaf mass, stem mass, stem diameter, leaf area, and chlorophyll a and b contents. The optimum concentrations of total nitrogen, P, K, calcium, and sulfur in the cannabis leaves were 0.54, 0.073, 0.27, 0.56, and 0.38 mg g-1, respectively. An increase in P and K concentrations decreased the magnesium concentration in the leaves, but it was unaffected by the increase in N concentration. The recommended primary macronutrients for cannabis plants in the vegetative stage based on the maximum desirability and nutrient use efficiencies were 160-200 mg L-1 N, 30 mg L-1 P, and 60 mg L-1 K. These findings can offer valuable insight and guidance to growers regarding the mineral requirements for cannabis during the vegetative stage.

Incorporation of computational routines in a microservice architecture in AgDataBox platform

Agriculture has been undergoing a digital process that aims to apply digital technologies to make the sector more productive, profitable, and environmentally responsible. This trend has been adopted since applying precision agriculture (PA) techniques and, more recently, with digital agriculture (DA). DA aims to use all available information and knowledge to enable the automation of sustainable processes in agriculture, applying data analysis methods and techniques by specific software and platforms to collect and transform data into meaningful information for agriculture. Platform AgDataBox (ADB) offers tools to allow agriculture specialists to obtain, process, and visualize data for the correct decision-making. However, its structure needed to be readjusted to new software architecture to allow the aggregation of new functionalities and expand the ADB platform. This study aimed to develop a web microservices architecture (ADB-MSA) to incorporate the required functionalities to create thematic maps (TMs) and delineate management zones (MZs). ADB-MSA provided eight microservices, six of which (statistics, spatial, interpolation, clustering, rectification, and lime/nutrient recommendation) execute procedures based on JavaScript, R, and Python programming languages. At the same time, the other two are used to store data. In the case study, the procedures to create TMs and delineate MZs were performed with data from one commercial area. Thus, the services provided in the architecture meet the steps of creating TMs and delineating MZs, as MZs for fertilizer application were generated and evaluated according to phosphorus and potassium requirements. ADB-MSA allows the development of several new client applications (web, mobile, desktop, and embedded systems) to promote solutions in agriculture, streamlining processes, as it abstracts the implementation and execution complexity of available algorithms.

Evaluating Nutrient Composition of Adult Patients’ Normal Diet Menus: Experience of Public Hospitals in Türkiye

Background: Hospital menus are profoundly important to meet the nourishment needs of patients. So, this study is conducted to determine the nutrient adequacy of adult patients’ normal diet menus. Methods: An evaluation of 30-day fixed menus consisting of 4 dishes was conducted in four different public hospitals in Ankara, the capital of Türkiye. Mean adequacy ratio (MAR) and nutrient adequacy ratio (NAR) were used to examine the sufficiency of nutrients and meals. Results: For all the hospitals, MAR value was found higher than %85. However, nutrient adequacy ratio of dietary fiber, calcium and magnesium were lower than the other nutrients. It was determined that total fat, saturated fat, salt and cholesterol (except hospital D) contents were high according to the recommended values. Nevertheless, these fixed menus supplied 75% daily fiber on average. Hospital A and D menus met calcium requirements by 73% and 67%, respectively. While hospital D menus met magnesium (76%) and potassium (67%) requirements moderately, other hospitals approached 100% sufficiency for potassium. It is remarkable that in all the hospitals the amount of fruits seemed very low, up to 34%. Conclusion: As the hospital meal is an essential part of in-patients’ institutional care and nutritional support, the nutrient contents of menus should be monitored for nutritional requirements and, if necessary, there should be initiatives and arrangements in standard recipes to reduce salt and fat contents.

Revalidation of potassium requirement for maize (Zea mays) in Eastern dry zone of Karnataka

Revalidation of potassium requirement for maize (Zea mays) in Eastern dry zone of Karnataka

Potassium-mediated bacterial chemotactic response.

Bacteria in biofilms secrete potassium ions to attract free swimming cells. However, the basis of chemotaxis to potassium remains poorly understood. Here, using a microfluidic device, we found that Escherichia coli can rapidly accumulate in regions of high potassium concentration on the order of millimoles. Using a bead assay, we measured the dynamic response of individual flagellar motors to stepwise changes in potassium concentration, finding that the response resulted from the chemotaxis signaling pathway. To characterize the chemotactic response to potassium, we measured the dose-response curve and adaptation kinetics via an Förster resonance energy transfer (FRET) assay, finding that the chemotaxis pathway exhibited a sensitive response and fast adaptation to potassium. We further found that the two major chemoreceptors Tar and Tsr respond differently to potassium. Tar receptors exhibit a biphasic response, whereas Tsr receptors respond to potassium as an attractant. These different responses were consistent with the responses of the two receptors to intracellular pH changes. The sensitive response and fast adaptation allow bacteria to sense and localize small changes in potassium concentration. The differential responses of Tar and Tsr receptors to potassium suggest that cells at different growth stages respond differently to potassium and may have different requirements for potassium.

Potassium-mediated bacterial chemotactic response

Bacteria in biofilms secrete potassium ions to attract free swimming cells. However, the basis of chemotaxis to potassium remains poorly understood. Here, using a microfluidic device, we found that Escherichia coli can rapidly accumulate in regions of high potassium concentration on the order of millimoles. Using a bead assay, we measured the dynamic response of individual flagellar motors to stepwise changes in potassium concentration, finding that the response resulted from the chemotaxis signaling pathway. To characterize the chemotactic response to potassium, we measured the dose–response curve and adaptation kinetics via an Förster resonance energy transfer (FRET) assay, finding that the chemotaxis pathway exhibited a sensitive response and fast adaptation to potassium. We further found that the two major chemoreceptors Tar and Tsr respond differently to potassium. Tar receptors exhibit a biphasic response, whereas Tsr receptors respond to potassium as an attractant. These different responses were consistent with the responses of the two receptors to intracellular pH changes. The sensitive response and fast adaptation allow bacteria to sense and localize small changes in potassium concentration. The differential responses of Tar and Tsr receptors to potassium suggest that cells at different growth stages respond differently to potassium and may have different requirements for potassium.

Status quo of fertilization strategies and nutrient farm gate budgets on stockless organic vegetable farms in Germany

Fertilizer management in stockless organic vegetable production is strongly affected by external nutrient purchases due to the high nitrogen (N) and potassium (K) requirements of vegetables. However, the database on nutrient flows and budgets in organic vegetable farming in Europe is very limited. Therefore, a survey based on semi-structured interviews was carried out comprising 12 organic horticultural farms in Germany. The results show that three different main fertilizer categories are used as inputs in different ratios by the inventoried farms: (1) base fertilizers (e.g., composts, solid farmyard manures), (2) commercial organic N fertilizers (e.g., keratins or plant products from food production or fermentation processes), and (3) commercial mineral fertilizers (e.g., potassium sulfate), all of which are approved for organic production. Ninety percent of the total nutrient inputs to the farms came from these fertilizers and biological N2 fixation, with the remaining 10% coming from other inputs, such as seeds or growing media. The estimated yearly average total farm budgets were nearly balanced across all farms with moderate surpluses (67.5 kg N ha−1, 2.06 kg P ha−1, and 0.26 kg K ha−1). However, large imbalances were found for most of the individual farms. These imbalances indicate the risk of nutrient accumulation or nutrient depletion in the soil, depending on the fertilization strategy and productivity of the farm. More specifically, increasing N share from base fertilizers led to increased P and K budgets, while strategies based on the use of large amounts of keratins led to the opposite—K and P depletion. We concluded that balanced nutrient management in organic vegetable production systems requires a thorough calculation and should combine the use of base fertilizers, commercial fertilizers with low P content, and increased N supply via BNF.

A single-center retrospective study on the clinical features of thyrotoxic periodic paralysis.

Thyrotoxic periodic paralysis (TPP) is characterized by muscle paralysis and significant intracellular potassium movement resulting in hypokalemia. Since TPP is a rare condition, only a few studies have explicated the clinical characteristics of patients with this disease. This study aimed to elucidate the clinical characteristics of patients with TPP by comparing them with those with thyrotoxicosis without paralysis (non-TPP) and sporadic periodic paralysis (SPP). This was a single-center retrospective cohort study. Clinical data of patients with hyperthyroidism (n = 62) or periodic paralysis (n = 92) who were emergently admitted to our hospital was extracted from the electronic medical records and analyzed. All patients in the TPP group (15 males and 2 females) had Graves' disease, with 14 being newly diagnosed. The average serum potassium level on admission was 2.3±0.75 mEq/L. No significant correlation was observed among serum potassium level, amount of potassium required for normalization, and thyroid hormone levels. The TPP group showed significantly younger age, higher male ratio and body mass index (BMI), and lower serum potassium and phosphorus levels than the non-TPP group, which comprised 36 patients with Graves' disease. No significant differences were observed between the TPP and SPP (n = 11) groups in terms of age, sex, BMI, serum electrolyte levels, potassium requirement for normalization, and recovery time. Considering that most patients with TPP have undiagnosed Graves' disease, distinguishing TPP from SPP based on clinical information and course alone is difficult in emergency settings. Therefore, for early detection and launch of specific treatment of Graves' disease, screening for thyroid hormone and anti-thyroid stimulating hormone receptor antibody levels is necessary when treating patients with periodic paralysis.

Effect of Different Nitrogen and Potassium Levels on Yield and Nutrient Uptake of RNR 15048 during Summer Season in Southern Odisha

Background: The low glycemic rice variety RNR 15048 was introduced in Southern Odisha recently but the nitrogen and potassium requirement was not worked out for rabi / summer season. Methods: In this study, RNR 15048, a low glycemic index rice variety, was conducted in a split plot design with four main plots at 0, 50, 100 and 150 kg of nitrogen per hectare and three subplot levels at 0, 30 and 60 kg of potassium per hectare, each of which was reproduced three times. Result: A significant increase in yield, yield components and NPK uptake was noted with increase in nitrogen levels from 0 to 50, 100 and 150 kg/ha and potassium levels from 0 to 30 and 60 kg/ha.

Soil Fertility Evaluation and Fertilizer Requirements of Nitrogen, Phosphorus and Potassium for Wheat Production (Sharq El-Owainat – Western South Egypt)

Soil Fertility Evaluation and Fertilizer Requirements of Nitrogen, Phosphorus and Potassium for Wheat Production (Sharq El-Owainat – Western South Egypt)

Test of Acceptance and Potassium Pancake Levels of Red Bean Formulation as a Sanck Alternative for Hypertension Pantients

According to the AKG (2019), the potassium requirement of adults is 4,700 mg. If a snack is given 10% of the requirement, then 470 mg is obtained per snack meal. To meet this need, an innovation of high-potassium snacks was carried out by formulating red beans in the form of flour into pancakes. The purpose of this study to determine the acceptability and potassium content of red bean pancake formulation as an alternative snack for people with hypertension. This study was an experiment on 4 different formulations with a ratio of wheat flour and red bean flour 100: 0 g, 85: 15 g, 70: 30 g, 50: 50 g, then tested for acceptability and tested for potassium levels. The highest acceptability test was in formulation 3 (PKM 3), which was 3.59 in the preferred category with a potassium content of 447.5 mg/100g. One serving of red bean pancake snack based on caloric needs obtained 80 grams for adult men with 358 mg of potassium and 67 grams for adult women with 300 mg of potassium. The highest acceptability test was in formulation 3 (PKM 3). One serving of red bean pancake snack can not meet the needs of potassium

Sodium substitutes potassium requirements of sugar beet under saline–sodic conditions

AbstractBackgroundPotassium (K) substitution by sodium (Na) in sugar beet nutrition has been investigated during the last two decades and promising results have been revealed. However, substitution is still not used in agriculture although it has been recommended that Na can replace K to a large degree, proposing an interesting fertilization strategy for such plants. This study investigates the feasibility of sugar beet production on saline–sodic soils considering Na as a substituent for K.AimsThe aim of this study is to develop a fertilizer strategy considering Na concentration in saline–sodic soils as a partial substituent to K fertilizer and to determine the level of substitution.MethodsTwo saline–sodic soils (SAR15 and SAR19 representing sodium adsorption ratios 15 and 19 [mmol L–1]1/2, respectively) with low plant‐available K were selected to investigate the substitution of K fertilizer requirements with indigenous soil Na. A pot experiment was conducted with 20 kg soil per pot having four treatments, that is, KA: recommended K; KB: recommended K–K equivalent to 2.5% of soil Na; KC: recommended K–K equivalent to 5% of soil Na; and control without K fertilizer application were established mixing potassium sulfate (K2SO4) in the soil at the time of sugar beet sowing. The sugar beet plants were harvested 90 days after sowing.ResultsThe results revealed that total plant biomass was significantly improved in KB as compared to KA. This indicates that K requirement of sugar beet was substituted by Na, and KB provided optimum results on SAR15 as compared SAR19 considering all other K combinations.ConclusionIn sugar beet nutrition, K can be replaced by Na to a large degree on saline–sodic soils under K‐deficient conditions. Therefore, sugar beet production on marginal saline–sodic soil can be a win–win strategy boosting sugar beet production and reducing input cost.

The Diet Quality of Australian Stroke Survivors in a Community Setting

Introduction: Diet quality is a marker of how closely eating patterns reflect dietary guidelines. The highest tertile for diet quality scores is associated with 40% lower odds of first stroke compared with the lowest tertile. Little is known about the diet of stroke survivors. We aimed to assess dietary intake and quality of Australian stroke survivors. Methods: Stroke survivors enrolled in the ENAbLE pilot trial (2019/ETH11533, ACTRN12620000189921) and Food Choices after Stroke study (2020ETH/02264) completed the Australian Eating Survey Food Frequency Questionnaire (AES), a 120-item, semiquantitative questionnaire of habitual food intake over the previous 3–6 months. Diet quality was determined by calculating the Australian Recommended Food Score (ARFS): a higher score indicates higher diet quality. Results: Eighty-nine adult, stroke survivors (female: n = 45, 51%) of mean age 59.5 years (±9.9) had a mean ARFS of 30.5 (±9.9) (low diet quality). Mean energy intake was similar to the Australian population: 34.1% from noncore (energy-dense/nutrient-poor) and 65.9% from core (healthy) foods. However, participants in the lowest tertile for diet quality (n = 31) had significantly lower intake of core (60.0%) and higher intake from noncore foods (40.0%). Most participants did not meet daily requirements for fiber, potassium, or omega 3 fatty acids (2%, 15%, and 18%), nutrients important to reduce stroke risk. Conclusion: The diet quality of stroke survivors was poor, with inadequate intake of nutrients important for reducing recurrent stroke risk. Further research is needed to develop effective interventions to improve diet quality.

Potassium requirement, nutrient uptake and efficiency of chickpea (Cicer arietinum L.) in Vertisols of North West Ethiopia

Vertisols occur in a wide range of climatic zones but most abundantly in the tropics. Nutrient deficiencies and poor management practices limit the productivity of Vertisols. As soil test methods are unreliable indicators of potassium (K) availability on Vertisols because of the type of clay minerals and surface properties, it is important to assess the response of applied K for plant nutrition. Field experiments were conducted to determine the requirement of K for chickpea and evaluate the impact of K on the uptake and efficiency of nutrients in Vertisols of North West Ethiopia. The experiment was laid out in a randomized complete block design (RCBD) in three replications. Potassium was added at four levels (0, 50,100 and 150 kg ha−1) as muriate of potash (KCl), and a basal dose of NPS. The result indicated that K at a rate of 100 kg ha−1 KCl produced the highest dry matter and grain yield increase (4436.53 and 2289.33 kg ha−1, respectively; p < 0.05) during the 2015 and 2016 main cropping seasons at two sites. The concentration, total uptake of nutrients and total nitrogen were enhanced and agronomic efficiency parameters were improved by the application of K in chickpea plants. The study revealed that fertilization of chickpea by inorganic K could be used to increase grain yield and quality of chickpea in the study sites.

Overexpression profiling reveals cellular requirements in the context of genetic backgrounds and environments.

Overexpression can help life adapt to stressful environments, making an examination of overexpressed genes valuable for understanding stress tolerance mechanisms. However, a systematic study of genes whose overexpression is functionally adaptive (GOFAs) under stress has yet to be conducted. We developed a new overexpression profiling method and systematically identified GOFAs in Saccharomyces cerevisiae under stress (heat, salt, and oxidative). Our results show that adaptive overexpression compensates for deficiencies and increases fitness under stress, like calcium under salt stress. We also investigated the impact of different genetic backgrounds on GOFAs, which varied among three S. cerevisiae strains reflecting differing calcium and potassium requirements for salt stress tolerance. Our study of a knockout collection also suggested that calcium prevents mitochondrial outbursts under salt stress. Mitochondria-enhancing GOFAs were only adaptive when adequate calcium was available and non-adaptive when calcium was deficient, supporting this idea. Our findings indicate that adaptive overexpression meets the cell's needs for maximizing the organism's adaptive capacity in the given environment and genetic context.

Integrating crop and soil nutrient management for higher wheat grain yield and protein concentration in dryland areas

Wheat grain protein concentration (GPC) is a key parameter related to processing quality and amino acid intake. However, synchronously enhancing grain yield (GY) and GPC is still challenging due to the physiological competition between carbon and nitrogen. This study determined plant and soil nutrients and surveyed yield and management data from 304 wheat fields at three locations on the Loess Plateau of China to explore limitations and design practices for producing high-yielding and high-protein wheat sustainably. Based on the overall average GY (4732 kg ha–1) and GPC (13.1%), the surveyed fields were grouped into low yield & low protein (LyLp), low yield & high protein (LyHp), high yield & low protein (HyLp), and high yield & high protein (HyHp), with average GYs of 3625, 3653, 5912, and 5962 kg ha–1 and GPCs of 11.2%, 15.2%, 11.7%, and 14.9%, respectively. The GY has significant positive correlations with cultivar release year (r = 0.192), plant density (r = 0.204), and soil total nitrogen (r = 0.131), a negative correlation with sowing date (r = –0.257), but no correlations with fertilizer rates and soil available nutrients of nitrogen, phosphorus, and potassium. Nitrogen and potassium requirements in HyHp fields were 25.1% and 16.4% higher than that in HyLp fields. Accordingly, HyHp fields had significant higher nitrogen and potassium fertilizer rates and soil nitrogen and potassium supplies than HyLp fields. Structural equation modelling showed that cultivar release year contributed the most to the GY variations, while soil available potassium has the largest effect on the GPC. In addition, soil nitrogen surplus was approximately 50% decreased from low- to high-yielding fields, but did not differ between HyLp and HyHp fields. These findings indicate that the integrated crop and soil management strategies, including improved newer cultivar, timely sowing date, advisable plant density and fertilizer rates, and adequate soil nutrients supply, are applicable for the complicated and changeable wheat production environments to improve GY and GPC synchronously.

Reduction in Nitrogen Rate and Improvement of Nitrogen Use Efficiency without Loss of Peanut Yield by Regional Mean Optimal Rate of Chemical Fertilizer Based on a Multi-Site Field Experiment in the North China Plain

It is important to quantify nutrient requirements and optimize fertilization to improve peanut yield and fertilizer use efficiency. In this study, a multi-site field trial was conducted from 2020 to 2021 in the North China Plain to estimate nitrogen (N), phosphorus (P), and potassium (K) uptake and requirements of peanuts, and to evaluate the effects of fertilization recommendations from the regional mean optimal rate (RMOR) on dry matter, pod yield, nutrient uptake, and fertilizer use efficiency. Results show that compared with farmer practice fertilization (FP), optimal fertilization (OPT) based on the RMOR increased peanut dry matter by 6.6% and pod yield by 10.9%. The average uptake rates of N, P, and K were 214.3, 23.3, and 78.4 kg/ha, respectively, with 76.0% N harvest index, 59.8% P harvest index, and 41.4% K harvest index. The OPT treatment increased N, P, and K uptake by 19.3%, 7.3%, and 11.0% compared with FP, respectively. However, the average of yield, nutrition uptake, and harvest indexes of N, P, and K were not significantly affected by fertilization. The peanut required 42.0 kg N, 4.6 kg P, and 15.3 kg K to produce 1000 kg of pods. The OPT treatment significantly improved the N partial factor productivity and N uptake efficiency but decreased the K partial factor productivity and K uptake efficiency. The present study demonstrates that fertilizer recommendations from RMOR improve N use efficiency, and reduce N and P fertilizer application without yield loss in regions with smallholder farmers, and the corresponding estimation of nutrient requirements helps to make peanut fertilization recommendations.