Amount Of Potassium Fertilizer Research Articles

Development of critical K dilution curves for diagnosing sweetpotato K status.

Scientific and reasonable application of potassium fertilizer is an important agronomic measure to achieve high yield and high quality of sweetpotato, and it is of great significance to determine the appropriate amount of potassium fertilizer in the field. For this we constructing a model of the critical K dilution curve (CKDC) of sweetpotato under different N levels to determine crop nutritional statuses. In this study, a 3-year field experiment was conducted in Zhejiang Province in China, using two nitrogen levels (N0: 0kg ha-1 and N1: 120kg ha-1) and five K fertilization rates (K0: 0, K1: 75, K2: 150, K3: 225, K4: 300kg ha-1) for two sweetpotato cultivars of 'Shang 19' and 'Yan 25'. Plant dry matter first increased and then decreased and the K concentration increased continuously with an increase in K application rate. The required amount of K fertilizer to achieve maximum sweetpotato yield under high N conditions was greater than that under low nitrogen conditions. A new CKDC based on dry matter and K concentration was created to assess K nutrition in sweetpotato. At two N levels, CKDC was expressed by the negative power function equation, aboveground: Kc(N0)=5.30W-0.463, R2=0.79, and Kc(N1)=4.23W-0.298, R2=0.78, under-ground: Kc(N0)=1.38W-0.125, R2=0.81, and Kc(N1)=1.32W-0.132, R2=0.72;whole-plant: Kc(N0)=4.31W-0.421, R2=0.80; Kc(N1)=3.89W-0.415, R2=0.79. There is no significantly different for CKDC of whole-plant and underground between N0 and N1 levels, while there is significantly different for CKDC of aboveground between N0 and N1 levels. N fertilizer can strengthen the dilution effect of K concentration, and its effect on the aboveground is greater than that on the underground and whole-plant. Then, potassium nutrition indexes were constructed to identify K nutrition status and could be used as a reliable indicator for K nutrition diagnosis of sweetpotato. The results provide a theoretical basis to improve K fertilization management and sustainability of sweetpotato.

Effect of potassium on yield and some qualitative and physiological traits of safflower (Carthamus tinctorius L.) under drought stress conditions

Improving the pattern of water consumption in the agricultural sector is one of the necessary measures to manage the water crisis in the country. The present study was conducted to investigate the effects of drought stress on yield and physiological characteristics of safflower under different amounts of potassium fertilizer. The experiment was performed as a combined analysis in a randomized complete block design with three replications during 2018 and 2019. The main plot consisted of drought stress at three levels of 45%, 65%, and 85% of permissible moisture drain and the subplot consisted of potassium fertilizer at four levels of zero, 75, 150, and 225 kg of potassium sulfate per hectare. In the second year compared to the first year, the amount of proline and seed oil were significantly higher by 23.4% and 4.43%, respectively, and the amount of carbohydrates and chlorophyll a were significantly lower by 11.9% and 27.4%, respectively. With increasing potassium intake, the amount of chlorophyll a increased significantly, and the highest amount of chlorophyll a at the rate of 16.7 mg/L was obtained in the treatment of 225 kg of potassium per hectare. With increasing the intensity of stress from 45% to 85% of moisture drain in different levels of potassium fertilizer, seed yield decreased significantly. Treatment of 85% moisture drain in no application of potassium showed the highest amount of proline. The application of potassium is effective in modulating the negative effects of drought stress on seed yield, qualitative, and physiological characteristics of safflower.

Interactive effect of irrigation and blend ratio of controlled release potassium chloride and potassium chloride on greenhouse tomato production in the Yellow River Basin of China

Soil water and fertilizer are two main factors affecting tomato yield and quality, and their optimization management is crucial for sustainable production. There are many studies about the response of tomato growth and fruit yield formation to irrigation level and potassium (K) fertilizer, but few studies have been conducted on the responses of irrigation level and controlled release potassium chloride (CRK), not to mention the different irrigation levels and CRK to KCl blending ratios. In this study, two consecutive growing seasons (2020–2021) tomato pot experiments were presented with three irrigation levels (W100, W80, and W60) and three blending ratios of CRK to KCl (100%, 80%/20%, 60%/40%) under the condition that the amount of potassium fertilizer was reduced by 40% compared with conventional application rate. The results revealed that under W80 water conditions, 80% CRK mixed with 20% KCl application led to a significant increase in tomato yield by 4.1–11.9% and 4.6–18.9%, K use efficiency by 11.5–34.2% and 6.1–32.3%, fruit vitamin C content by 9.3–25.3% and 5.6–28.3%, fruit soluble sugar content by 10.2–20.0% and 10.2–24.1% in 2020 and 2021, respectively, compared with the other K fertilization treatments. Meanwhile, the water use efficiency and fruit soluble solid content of W80K80 treatment were also maintained at a high level. Molecular analysis shows that the W80K80 treatment had a higher photosynthetic rate, rubisco content, cytokinin content, and osmotic regulation substances content, and lower abscisic acid (ABA), malondialdehyde (MDA), and hydrogen peroxide (H2O2) contents. Our results indicated that 80% irrigation level and 80% CRK-20% KCl blending ratio were the optimal water and K supply mode for tomato production in this study. The result provided useful information regarding greenhouse tomato production that would allow the achievement of higher fruit yield, quality and resource use efficiencies, and provided theoretical and technical support for greenhouse tomato irrigation and K fertilizer application technologies.

Effects of Potassium Application and Straw Returning on Potassium Management and Benefit of Banana

HighlightsThe effects of potash fertilizer and straw returning on a banana orchard were studied by field experiment.Fertilizer with straw was more conductive to potassium nutrient balance and improved banana yield and quality.The economic benefits of straw replacing different amounts of potassium fertilizer were compared.Abstract. To explore the effects of potash fertilizer and straw returning in banana production, a field experiment was carried out, and four treatments were set up: NP fertilizer (NP), NP fertilizer and banana straw (NP+St), NPK fertilizer (NPK), and NPK fertilizer and banana straw (NPK+St). Through the soil potassium balance, the effects of potash fertilizer and straw returning on the yield, quality, and economic benefits of bananas were studied. The results showed that the application of potash fertilizer and straw could improve banana yields. Compared with the NP treatment, the banana yields of the NP+St, NPK, and NPK+St treatments increased by 17.5%, 50.5%, and 71.6%, respectively. The order of banana yield, potassium balance coefficient, and nutrient accumulation was NPK+St > NP+St > NPK > NP. The NPK+St treatment also improved the recovery rate and agronomic utilization rate of potash fertilizer, which were higher than that of potassium application without straw (NPK) and straw application without potassium (NP+St). Potassium application with straw improved the banana yield, increased the total accumulation of nitrogen, phosphorus, and potassium, and improved the efficiency of potash fertilizer uptake by the crop. Therefore, this study demonstrates the importance of straw for maintaining the soil potassium balance in banana production. The input cost of potassium fertilizer was reduced, and the resource utilization of banana straw was realized by straw returning, which can be promoted in local agricultural production. Keywords: Banana, Potassium application, Potassium balance, Straw returning, Yield.

Economic Study of the Use of Renewable Energy and Technology in Growing Summer Tomatoes

The agricultural sector occupies an important place among the sectors of the national economy, so we must increase the average yield per acre of agricultural crops, more than By using what was developed in the field of modern technology, so renewable energy and technology is the most appropriate in all these current Egyptian economic changes.Where the production functions using the log-stage model show that the production of the summer tomato crop using solar irrigation during the season 2019, that the model used as a whole is significant at the probability level (0.01), where it was found that there is a statistically positive relationship between the quantity of production (r) per ton, and each of the total Human labor (Q1), total automatic working hours per hour / feddan (Q2), the amount of nitrogen fertilizer per unit (Q5), the amount of potassium fertilizer per unit (Q7), as by increasing the previously mentioned independent factors by 1%, it leads to an increase in summer tomato production by about 0.328%, 0.320%, 0.595%, 0.45%, respectively, as the staged logarithmic model shows that Equation No. (2) In Table No. (2) The effect of the aforementioned variables on the yield of the summer tomato crop using solar irrigation during the season 2019, that the model used As a whole meaning at the probability level (0.01), where it was found that there is a statistically positive relationship between the quantity of production (y) per ton, and each of the total automatic working hours hour / feddan (Q2), the amount of municipal fertilizer (Q4), and the amount of potassium fertilizer per unit (Q7) As it is by increasing the factors A. The aforementioned independent one by 1% would lead to an increase in summer tomato production by about 0.746%, 0.119% and 0.879%, respectively.Where it became evident that the farmers who used solar energy irrigation achieved the highest net return of the summer tomato crop, which amounted to about 33.85 thousand pounds, while the irrigation farmers who used solar irrigation achieved the lowest net return of the tomato crop, which amounted to about 11.97 thousand pounds.

Effect of Paddy Field Construction on Soil Nutrients of Rice at Different Growth Stages in Xi’an

In this paper, three typical soil types around the banks of the Grand Xi’an River are described. Lou soil, entisols and loessial soil were used as the research objects and the rice growing stages, including pre-treatment, tillering stage, jointing stage, heading stage and maturity stage, in paddy field construction were analyzed. The results showed that: In the field, the effects of Tillage in different types of soil layer ranging from 0 to 20 cm on soil nutrients are obvious, in which available phosphorus, nitrate nitrogen, ammonium nitrogen content decreased during the growth period and the content of available potassium in the overall appear to be rising. It was concluded that the jointing stage was the most prosperous period of rice growth, the potassium content in the region could meet the growth demand, and the amount of potassium fertilizer could be reduced in the coming year.

The Effect of Formulation and Amount of Potassium Fertilizer on Macromineral Concentration and Cation-Anion Difference in Tall Fescue

This study investigated the feasibility of altering the dietary cation-anion difference (DCAD) in grass by altering the grass variety and the amount and formulation of K fertilizer application. In experiment 1, treatments were combinations of 2 varieties (Barcel and Hi-Mag) of tall fescue (Festuca arundinacea Schreb); 2 rates of K (0 and 250kg/ha), supplied as KCl; and 2 rates of Mg (0 and 60kg/ha), supplied as MgO. In experiment 2, K fertilizer was applied at 0 or 125kg/ha as KCl or K2SO4. There was no difference between HiMag and Barcel tall fescue in the concentrations of Mg, S, and Cl. Application of K fertilizer decreased concentrations of Mg, but the magnitude of the decrease was not consistent across harvests. Conversely, application of Mg fertilizer increased Mg concentrations, but again, the magnitude of the increase was not consistent across harvests. The concentrations of Ca were higher in HiMag than in Barcel tall fescue, with the magnitude of the difference increasing from first to last harvest. Potassium fertilizer decreased Ca concentrations in the first, fourth, and fifth harvests only. Calcium concentration was decreased by a greater magnitude in HiMag tall fescue as a result of Mg fertilization. The HiMag tall fescue contained lower concentrations of K than did Barcel tall fescue in the first, second, and third harvests. Application of K fertilizer increased the K concentration in all 5 harvests but did not affect Na concentrations except in the last harvest. The HiMag tall fescue contained less Na than did Barcel, but the magnitude of the difference was affected by K and Mg fertilization. Application of K fertilizer decreased S concentrations in first-harvest grass, increased concentrations in second-and third-harvest grasses, and had no effect in fourth-or fifth-harvest grasses. Application of Mg fertilizer decreased S concentrations of tall fescue. Application of K fertilizer increased DCAD values for grass harvested from the second through fifth harvests. The increase in DCAD attributable to K fertilizer was less in HiMag than in Barcel tall fescue. Application of K fertilizer as K2SO4 increased dry matter yield and S concentrations of HiMag tall fescue, whereas K applied as KCl increased concentrations of K and Cl. There was no effect of fertilizer formulation on Na concentrations. The DCAD was lower in HiMag tall fescue fertilized with K2SO4 compared with that fertilized with KCl. This study showed that DCAD of grass can be manipulated by the choice of grass variety, fertilizer formulation, and fertilizer application rate.

THE EFFECTS OF HEAVY DRESSINGS OF POTASH APPLIED TO THE SEEDBED OF A LEY COMPARED WITH ANNUAL DRESSINGS

Two experiments were established to compare the effect on the yield of continuously cut herbage of varying amounts of potassium fertilizer applied either in one large dose to the seedbed, or as 3 equal dressings applied to the seedbed and in the summer of the 2 following years. Responses in dry–matter yield were recorded up to the higher rates of potassium fertilizer applied. Establishment and yield in the first 12 months were improved by seedbed applications of up to 4 cwt/ac of muriate of potash (60% K2O). Although total yields over the whole period were similar, whether the potassium was applied to the seedbed only or in annual dressings, yields from “all–in–seedbed” dressings declined towards the end of the period. Soil analysis indicated that annual dressings left behind higher residues of K.

Studies on fertilizer supply to tulips. II

1. Experiments were carried out with large (16-18g) and small bulbs (1.7-2.0g) of William Pitt variety in a field of dune. The standard amounts of elements supplied to the plots were 26.3kg of nitrogen (Ammonium sulphate), 22.6kg of phosphorus (calcium super phosphate), 30.0kg of potassium (potassium sulphate), per 10a, and the test plots were set up by varing amounts one of the three elements: graded eleven degrees as from 0 to 37.5kg. Besides the eleven plots an unfertilized plot was added as control. 2. In general, the greater the amount of each element supplied, the higher the plant height, and with increased nitrogen fertilizer it was observed that their leaves became darker green. The flowering time had a tendency to be delayed with increasing the amount of nitrogen or potassium fertilizer, and to be hastened with increasing phosphate fertilizer. The increased rate of bulb weight and bulb number was most influenced by increasing the nitrogen supply, and less influenced by phosphate supply. 3. It was not difficult to find some relation between the number of split coat bulbs or the formation of droppers in the small bulbs, and the amount of each fertilizer supplied. The water content of bulbs tended to increase with increasing nitrogen or potassium and decreased with increasing phosphate. 4. It was also found that the differentiation of the flower bud occurred earlier in bulbs produced by supplying large amounts of nitrogen or phosphate, but the amount of potassium fertilizer seemed to have no effect on the flower bud differentiation. And, in the phosphate and the potassium plots, the relation between the earliness of flower bud differentiation and the smallness of water content of bulbs was recognized, but in nitrogen plots, it was hard to find such relation.

Effect of Fertilizing Potassium on Leaf-Quality of Bright Yellow Tobacco

Experiments were made with Wagner's 1/2000-are pots, the soil being fertilized with ammonium sulphate calcium superphosphate normally. Potassium was supplied in the form of sulphate, the quantity of which varied according to the plot from 0 to 8 grams per pot, expressed as K2O. Seedlings of a variety of American yellow-leaf tobacco were transplanted in these pots in May, 1950, and were harvested in July. It was observed, that the height of the plant, the total number of useful leaves on a plant and the mean length of stem-internode altogether decreased as the potassium supply was increased. Number of cells per unit area of the leaf epiderm were larger in the plants grown with greater amount of potassium. The leaf thickness measured on the middle leaves was maximum in the plant supplied with 4 grams of potassium fertilizer; with larger amount or potassium, the thickness decreased. The fresh weights of the middle and top leaves were reduced by excessive amount of potassium. Potassium content of leaves increased in parallel with the amount of potassium fertilizer. Total nitrogen, nicotine and glucose content showed no definite relations with the amount of potassium supply. The nicotine/total-nitrogen ratio was found highest in the samples taken from the middle leaves grown with 2 grams of potassium fertilizer, with larger amount of the fertilizer the ratio becoming lower. The ash content and its water soluble alkali degree showed maximum values in the leaves from the 4 grams fertilizer plots.