Effect Of Potassium Application Research Articles

Effects of Potassium Application on Photosynthetic Performance, Yield, and Quality of Sugar Beet with Mulching-drip Irrigation

Effects of Potassium Application on Photosynthetic Performance, Yield, and Quality of Sugar Beet with Mulching-drip Irrigation

Effect of potassium application in drought-stressed tobacco (Nicotiana rustica L.) plants: Comparison of root with foliar application

Effect of potassium (K) application through leaves (LA) or roots (RA) was studied in tobacco plants grown under K deficiency and drought stress conditions. Application of K was effective in improving the shoot growth only under drought conditions, whereas root biomass and length responded under both watering regimes. Under drought conditions, photosynthesis and transpiration activities increased upon K application leading to a reduced water use efficiency. Both RA and LA increased the leaf water potential, relative water content and turgor under both well-watered and drought conditions; RA was more effective than LA in the recovery of leaf turgor. Analyses of water relation parameters in different aged leaves showed lower susceptibility of the middle-aged leaves to both K deficiency and drought stresses than the upper and lower leaves; this phenomenon was accompanied by a more conservative control of water loss in the middle-aged leaves. In contrast, proline was accumulated in the young leaves, and K application increased it further. Although various organic osmolytes were accumulated under the combinative effect of K deficiency and drought stress, they did not exceed the amounts found in the control (well-watered +K) plants and were merely a result of the concentration effect. Collectively, our results revealed that the majority of leaf biochemical responses to drought stress are developmentally regulated processes. In addition, the alleviating effect of both RA and LA despite higher water loss indicated that an improved stomatal function upon K application allowed carbohydrates synthesis, thus, enhancing plant growth under water stress.

Effect of Potassium Application on Root Grow and Yield of Sweet Potato and Its Physiological Mechanism

Effect of Potassium Application on Root Grow and Yield of Sweet Potato and Its Physiological Mechanism

Effects of potassium application and soil moisture on the growth of Corymbia citriodora plants

The objective of this work was to evaluate the effects of potassium and soil moisture levels on the growth of Corymbia citriodora plants. Four doses of potassium were applied (0, 40, 80 and 120 mg.dm-3) and three soil moisture levels were established(50-80%, 65-80% and 80% of maximum soil field capacity). The experiment was a 4x3 factorial arrangement of treatments within a randomized complete design with six replications for each treatment and one pot with two plants for each plot. At 90 days after planting, the plant growth parameters: survival rate, height, stem diameter, leaf area, relative chlorophyll concentration, leaf dry mass, stem and branches dry mass, root dry mass, total dry mass and leaf macronutrient contents were measured. High soil moisture content is necessary for Corymbia citriodora seedlings at nursery stage. Effects of the K doses were not observed in plants, even when they were cultivated in a soil with a low content of this nutrient.

Potassium fertilization and 137Cs transfer from soil to grass and barley in Sweden after the Chernobyl fallout

Fertilization of soils contaminated by radionuclides with potassium (K) and its effect on 137Cs transfer from soil to crops is well studied in field conditions; however experiments over many years are few.The effects of potassium fertilization on cesium-137 (137Cs) transfer to hay, pasture grass, and barley growing on organic rich soils and mineral sand and loam soils in a number of field experimental sites situated in different environments in Sweden are summarized and discussed. The basic experimental treatments were control (no K fertilizers were applied), 50, 100, and 200 kg K ha−1. In the experiment, which lasted over 3–6 years, 137Cs transfer factors in control treatments ranged between 0.0004 m2 kg−1 (barley grain on sand soil) and 0.07 m2 kg−1 (pasture grass on organic rich soil). Potassium application on soils with low clay content i.e. mineral sand and organic rich soils was effective at the 50–100 kg ha−1 level. Application of 200 kg K ha−1 resulted in a five-fold reduction in 137Cs transfer for hay and up to four-fold for barley grain. The effects of potassium application were generally greater on sand than organic rich soil and were observed already in the first cut. After K application, the reduction in 137Cs transfer to crops was correlated with 137Cs:K ratios in plant material. Additional application of zeolite caused a 1.4 reduction of 137Cs transfer to hay on sand and 1.8-fold reduction on organic rich soil; whereas, application of potash-magnesia and CaO had no effect.

Effect of potassium application on celery growth and cation uptake under different calcium and magnesium levels in substrate culture

The effect of potassium (K) on celery (Apium graveolens L.) growth and cation uptake was studied under different calcium (Ca) and magnesium (Mg) levels in substrate culture in the greenhouse. Shoot and root fresh and dry weight and leaf area increased with increasing K application up to 8mmoll−1. High level of Ca and Mg (16mmoll−1) significantly inhibited celery growth compared to lower levels (4 and 8mmoll−1). In this study, K concentration in celery increased with increasing K application up to 8mmoll−1, but did not change significantly with further increases in K application. In contrast to K, the opposite trends were found for Na, Ca and Mg concentrations in celery. The order of K concentration in celery root, stalk and leaf was: stalk>root>leaf and for Ca was: leaf>stalk>root. Mg concentration in celery root and leaf was high when compared with stalk. In addition, 8 and 16mmoll−1 of Ca and Mg levels increased celery cation uptake as compared with 4mmoll−1 of Ca and Mg level. This study suggested that 4–8mmoll−1K applications under the condition of 8mmoll−1 of Ca and Mg level were appropriate for the improvement of celery growth and nutrient uptake

The effects of potassium on the yield and fruit quality components of stick tomato

This research was performed to determine the effects of potassium applied on soil to increase dose on the yield and yield components of stick tomato (Lycopersicon esculentum L. var. Şimsek) grown in greenhouse conditions in the Antalya Province in 2010. In this experiment, the Şimsek fresh tomato variety commonly grown in the Mediterranean region was tested with applications of 0, 40, 80, 120, and 160 kg K2O/ha. According to the results, the yield was greatest (195.7 Mt·ha −1) with 120 kg K2O/ha application. The effects of potassium application on tomato yield and yield components were statistically significant (P < 0.01 and P < 0.05). Depending on the application dose, plant stem diameter ranged from 14.22 to 14.99 mm, plant length 173.05 to 181.69 cm, fruit diameter 70.33 to 73.84 mm, fruit number per plant 29.20 to 34.57, fruit weight 160.45 to 185.63 g, penetration resistance 2.45 to 2.99 kg·cm −2, pH 5.10 to 5.20 and sugar content 3.67 to 3.97 ° Brix. In addition, the leaf N/K ratio also affected the tomato yield. Significant correlations were found among the macro and micronutrients of the leaf, yield, and yield components.

Effects of Potassium Application on Flavor Compounds of Cherry Tomato Fruits

ABSTRACT A pot experiment was conducted to determine the effects of potassium (K) application on volatile compounds, taste compounds, and firmness of fresh tomato fruits. Each pot was filled with 8 kg of clean sand. The experiment consisted of six K application rates with 0, 1.25, 2.5, 5.0, 10.0, and 20.0 mmol K L−1 in the nutrient solution. Volatile compounds, soluble sugars, soluble solids, titratable acidity, and firmness of fresh tomato fruits were measured. The results show that the concentrations of 3-methylbutanal, 1-penten-3-one, hexanal, cis-3-hexenal, 2-methyl-4-pentenal, trans-2-hexenal, 2E-4E-hexadienal, 6-methyl-5-hepten-2-one, phenylacetaldehyde, phenylethanol, soluble sugars, and soluble solids tended to increase at first and then decrease between 0 to 10.0 mmol K L−1. K application rate obtaining the highest values of the concentrations ranged from 1.4 to 3.0 mmol K L−1, with the exception of cis-3-hexenal (1.1 mmol K L−1), phenylacetaldehyde (4.5 mmol K L−1), and phenylethanol (4.8 mmol K L−1). By contrast, increasing K supply increased the concentration of titratable acidity, decreased the ratios of soluble sugars to titratable acidity and soluble solids to titratable acidity. Close correlations were observed between the concentrations of various volatile compounds, soluble sugars, and soluble solids. Based on contributions of these compounds to tomato flavor, we assume that moderate K supply (1.4–3.0 mmol K L−1) improves tomato flavor, whereas tomato fruits with either no K or high K fertilization have poor flavor due to having undesirable levels of flavor compounds.

Effect of potassium application on the transformation of zinc fractions in soil and on the zinc nutrition of wetland rice

AbstractThe effect of different levels of K application on the transformation of native as well as applied Zn fractions in a rice‐growing soil was studied under two moisture regimes viz. waterlogged and alternate waterlogged and saturation. Application of K caused an increase in the water‐soluble plus exchangeable, organically complexed and carbonates, and other acid‐soluble mineral fractions of native soil Zn. Application of K also caused an increase in the transformation of applied Zn into all the above three fractions of the element in soil. The above effects of K were more pronounced in soil under waterlogged than under alternate waterlogged and non‐waterlogged moisture regimes.The results of a greenhouse experiment showed that K application caused an increase in Zn uptake and per cent utilization of both native and added Zn by rice. This was attributed to the increase in the water‐soluble plus exchangeable and organically complexed forms of Zn in soil due to K application.

The effect of potassium application on leaf water relations characteristics of field grown barley plants (Hordeum distichum L.)

The effect of potassium application on leaf water relations characteristics of field grown barley plants (Hordeum distichum L.)

EFFECT OF SPLIT APPLICATION OF POTASSIUM TO LOWLAND RICE GROWN IN MARGINALLY SALINE SOILS

Field experiments were conducted in rabi and kharif seasons to find out the effect of potassium application on lowland rice in marginally saline soils. The results indicated that application of 125 kg k2 O/ha in three splits at transplanting, maxmium tillering and panicle primordium initiation stages significantly increassed the plant height, number of panicless/m2, dry matter production (DMP) in both the seasons. Leaf area index (LAI) was maximum at 125 kg k20/ha in three splits during kharif season and for rabi season it was maximum under 93.75 kg k20/ha in three splits. Highest grain yield" was obtained with 125 kg k20/ha applied in three splits in both the seasons.

Effect of potassium application during the floral initiation stage of plantains (Musa AAB)

All plantains given potassium produced better yields than the control. The optimal dose was 300 g K per plant and when applied to plantains at about 19/20th leaf stage (4–5 months after planting) significantly (P = 0.05) increased the bunch weight (73.9%), number of marketable fungers (33.7%) and finger weight (44.2%) per plant over the control. The efficiency of fruit set also increased by over 10% while the time of harvest from planting was reduced by over 3 months. Super-optimal K applications significantly (P = 0.05) decreased the yield of plantains. However, the efficacy of suboptimal applications improved when applied about the 20th leaf stage. Potassium applications later than 20th leaf stage (five months after planting) did not increase the bunches developed. Although super-optimal doses cold be applied during the vegetative stage at about 15th leaf stage (approximately 3 months planting) to obtain high yield, such applications are wasteful. High yield of plantains usually associated with heavy potassium application 2–3 months after planting could also be achieved by timely application of smaller quantities of potassium at 19/20th leaf stages when platains need it most for floral initiation.