Effect Of Potassium Fertilization Research Articles

Crop yield, nitrogen uptake and nitrate-nitrogen accumulation in soil as affected by 23 annual applications of fertilizer and manure in the rainfed region of Northwestern China

Application of chemical fertilizers and farmyard manure affects crop productivity and improves nutrient cycling within soil–plant systems, but the magnitude varies with soil-climatic conditions. A long-term (1982–2004) field experiment was conducted to investigate the effects of nitrogen (N), phosphorus (P), and potassium (K) fertilizers and farmyard swine manure (M) on seed and straw yield, protein concentration, and N uptake in the seed and straw of 19-year winter wheat (Triticum aestivum L.) and four-year oilseed (three-year canola, Brassica napus L. in 1987, 2000 and 2003; one-year flax, Linum usitatisimum L. in 1991), accumulation of nitrate-N (NO3-N) in the soil profile (0–210 cm), and N balance sheet on a Huangmian soil (calcaric cambisols, FAO) near Tianshui, Gansu, China. The two main plot treatments were without and with farmyard swine manure (M); sub-plot treatments were control (Ck), N, NP, and NPK.␣The average seed yield decreased in the order MNPK ≥ MNP > MN ≥ NPK ≥ NP > M > N > Ck. The average effect of manure and fertilizers on seed yield was in the order M > N > P > K. The seed yield increase was 20.5% for M, 17.8% for N, 14.2% for P, and 2.9 % for K treatment. Seed yield response to fertilizers was much greater for N and P than for K, and it was much greater for no manure than for manure treatment. The response of straw yield to fertilization treatments was usually similar to that of seed yield. The N fertilizer and manure significantly increased protein concentration and N uptake plant. From the standpoint of increasing crop yield and seed quality, MNPK was the best fertilization strategy. Annual applications of N fertilizer and manure for 23 successive years had a marked effect on NO3-N accumulation in the 0–210 cm soil profile. Accumulation of NO3-N in the deeper soil layers with application of N fertilizer and manure is regarded as a potential danger, because of pollution of the soil environment and of groundwater. Application of N fertilizer in combination with P and/or K fertilizers reduced residual soil NO3-N significantly compared with N fertilizer alone in both no manure and manure plots. The findings suggest that integrated and balanced application of N, P, and K fertilizers and␣manure at proper rates is important for protecting soil and groundwater from potential NO3-N pollution and for maintaining high crop productivity in the rainfed region of Northwestern China.

Potassium, Phosphorus, Sulfur, and Boron Fertilization Effects on Soybean Isoflavone Content and Other Seed Characteristics

ABSTRACT Soybean [Glycine max (L.) Merr.] seeds contain isoflavones that have positive impacts on human health. The objective of this study was to determine the impact of pre-plant mineral fertilization on isoflavone, oil and crude protein concentrations, and seed yield of field-grown soybean. The effects of potassium (0, 50, 100, and 150 kg K ha−1), phosphorus (0, 25, 50, and 75 kg P ha−1), sulfur (0, 15, 30, 45 kg S ha−1), and boron (0, 1.5, 3.0, and 4.5 kg B ha−1) were tested separately, each with two 00 soybean cultivars (‘Golden’ and ‘Grand Prix’) grown in replicated trials at Sainte-Anne-de-Bellevue, Québec, Canada in 2002/3. Seed total and individual isoflavone concentrations were determined by high-performance liquid chromatography. Seed yield, 100-seed weight, and oil and crude protein (CP) contents were determined concurrently. Across years and cultivars, no fertilizer treatments effects were observed for most variables. This overall lack of response to fertilizers was attributed to the relatively high initial fertility of the sandy loam and sandy clay loam soils used. However, total and individual isoflavone concentrations were significantly affected by year and cultivar. Across experiments, total isoflavone concentration was 33% greater on average in 2003 than in 2002, which was characterized by above-average temperatures and severe drought. Cultivar with the greatest isoflavone concentration varied depending on the year. Fertilization does not appear to be a viable strategy to increase isoflavone concentration of soybean seeds on medium-to high-fertility soils.

Leaching versus input of nitrogen, potassium and magnesium in different fertilizer regimens in Christmas tree stands of Abies nordmanniana in Denmark

The effects of nitrogen (N), potassium (K) and magnesium (Mg) fertilization and deposition on nutrient leaching were assessed in four Danish Nordmann fir Christmas tree stands on former arable land. NPK 23-3-7 fertilizer type was applied in doses between 0 and 1200 kg ha−1 year−1. Deposition of N, K and Mg varied between 16 and 21 kg N ha−1 year−1, 2 and 10 kg K ha−1 year−1, and 2 and 3 kg Mg ha−1 year−1. The concentration of NO3–N in the soil water on the sandy sites was characterized by notable pulses contrasting the mitigated peaks on the clayey site. In general, the soil water concentrations and leaching reflected the fertilization, except for K at one clayey site. Mean annual leaching of NO3–N ranged from approximately 6 kg ha−1 year−1 in the control treatment to 235 kg ha−1 year−1 in the 1200 kg ha−1 year−1 fertilizer treatment. In the treatment with the commonly used 300 kg NPK 23-3-7 fertilizer NO3–N leaching was estimated to be approximately 46 kg ha−1 year−1. Annual leaching of N was described in a general model based on the fertilizer input. K and Mg leaching were distinctly more site specific than was N leaching. The magnitude of NO3–N leaching caused by application of 300 kg NPK 23-3-7 fertilizer was between the leaching amounts observed in traditional Danish forestry and Danish agriculture.

Effect of potassium fertilizer and row direction on growth and yield potato (Solanum tuberosum l ) CV . Desiree

This study was conducted during growth season in privet farm (10)km from south east of Falluja beside Euphraties river bank in loamy –caly soil , to study the effect of three levels of potassium fertilizer (10, 60 and 120) Kg K2O / dm and two direction of row ( direction paralele to the sun light from the east to the west and on vertical direction to the sun light ) on the growth and yield of potato CV. Desiree using split – plot design the experiment results showed a significant increase in plant height and total yield of 51.09 cm and 8.63 ton / dm . Potassium at the rate of 120Kg K2O / dm with dire row direction paralele to sun light significantly increased tubers hydrogen and phosphorus content up to 2.397% and 1.145 % respectively , while using K2O at rate of 120Kg K2O /dm and row vertical direction to the sun light significantly increased tubers potassium content up to 5.79 % .

Effect of Natural Phosphate and Potassium Fertilizer on Growth, Yield and Seed Composition of Pea Plant in New Reclaimed Soil

Effect of Natural Phosphate and Potassium Fertilizer on Growth, Yield and Seed Composition of Pea Plant in New Reclaimed Soil

Potassium Fertilization Effects on Cotton Lint Yield, Yield Components, and Reniform Nematode Populations

Cotton (Gossypium hirsutum L.) lint yields have not changed appreciably during the last decade. Because more and higher infestations of reniform nematodes (Rotylenchulus reniformis) have been identified in mid‐southern USA fields, this nematode might be a mitigating factor in the cotton yield stagnation. The objectives were to determine how varying rates of K fertilization interacted with different cotton genotypes to influence dry matter partitioning, lint yield, fiber quality, and reniform nematode populations. Nine cotton genotypes were grown in the field under two levels of K fertilization (0 and 112 kg K ha−1) and two levels of aldicarb [2‐methyl‐2‐(methylthio)propionaldehyde 0‐methylcarbamoyloxime] application (0 and 1.68 kg a.i. ha−1) from 1999 through 2001. Reniform nematode numbers and aboveground dry matter partitioning were determined at various times in the growing season. Lint yield, yield components, and fiber quality were determined at the end of the season. Cotton grown with K fertilization hosted a 12% larger post‐harvest population of reniform nematode than the unfertilized control plants. Plants grown without K fertilization averaged a 10% greater specific leaf weight than the K fertilized plants. Of the 9 genotypes grown, only PayMaster 1218BR increased lint yield (10%) in response to K fertilization. An interaction between aldicarb application and K fertilization for lint yield during the 2000 growing season indicated that both reniform nematode parasitism and insufficient K fertilization may impose limitations to lint yield production. Large reinform nematode populations may be suppressing the yield response to K fertilization. Production practices that encourage robust plant growth may enhance proliferation of existing reniform nematode populations.

Effect of mineral nutrients on spot blotch severity in wheat, and associated increases in grain yield

Spot blotch, caused by Cochliobolus sativus, is a serious disease of wheat ( Triticum aestivum L.) in the warm lowlands of South Asia. A field study was conducted using two wheat varieties (Bhrikuti and Sonalika) during the 2001 and 2002 wheat seasons in Rampur, Nepal, to determine the effect of nitrogen, phosphorus, potassium, and chlorine fertilization on reducing spot blotch severity in wheat, and its associated increase in grain yield. Application of N alone reduced spot blotch severity by 8% in 2002. Phosphorus fertilization had no effect on spot blotch development. The balanced application of N, P, and K reduced disease severity by 15 and 22% in 2001 and 2002, respectively. Application of KCl as well as CaCl 2 reduced spot blotch severity, but the former caused 11% greater reduction than the latter. The two varieties responded differently to the mineral nutrients’ effect on spot blotch severity, suggesting the nutrients’ importance in cultivar selection when considering the effect of soil fertility on susceptibility to foliar diseases. The lower disease severity and higher grain yield observed after the application of KCl compared to CaCl 2 showed that KCl should be used on K-deficient soils in the warmer wheat growing regions of South Asia where spot blotch is a serious perennial wheat disease in intensive rice–wheat cropping systems.

Effect of potassium fertilizer and control of Corn stem borer on some growth characteristics of two varieties of maize Zea mays L.

Afield experiment was conducted in alluviul clay–loam soil in college of Agriculture Al-Anbar university during the growing season of 2002. The were 4 levels of potassium fertilizer (0, 20, 40, 60) kg k/ ha (K2SO4 41% K), two insecticides including (cruiser and diazinon) and two varieties of Corn (Buhooth 106, IPA 5012). Results can be summarized as follows: IPA 5012 genotype recorded less day number from sowing upto 50% male flowering and gave alowest percentage of infestation for both season, while Buhooth 106 genotype recorded ahighest mean of plant length, leaf area and dry weight of plant. Plants fertilized whith 60 Kg K / ha gave ahighest means in plant length and plant dry weight, that level also recorded alowest percentage of infestation. Treatment of control plant with insecticide cruiser showed alowest percentage of infestation and highe significant in plant length, plant dry weight for both seasons and leaf area in autumn. The interaction between genotype and potassium fertilizer had asignificant effects (P<0.05) in flowering earliness until 50% flowering male for spring season and plant dry weight in autumn season. The interaction between the insecticide (cruiser) and potassium fertilizer 60 Kg K / ha resulted in highest length of plant (184.70 cm) and the interaction between this insecticide and fertilizer with 40 kg k / ha gave ahighest mean of leaf area (6340.25 cm2 / plant) in autumn season only.

Effect of potassium fertilizer and control of Corn stem borer on yield components, grain yield and its quality of two varieties of maize Zea mays L.

A factorial experiment in R.C.B.D. was conducted in alluviul clay–loam soil in college of Agriculture AL-Anbar university during the growing season of 2002, There were 4 levels of potassium fertilizer (0, 20, 40, 60) kg k/ ha (K2SO4), two insecticides including (cruiser and diazinon) and two varieties of Corn (Buhooth 106 , IPA 5012). Results can be summarized as follows: IPA 5012 genotype recorded alowest percentage of infestation and gave ahighest rang of grains No./ row, grain yield production (3.05, 6.52) ton / ha and protein percentage in grains (10.39, 10.88)% for spring and autumn seasons respectively, while Buhooth 106 genotype recorded ahighest range of 300 grain weight (66.95 g) in spring season. The level of 60 kg K / ha showed significantly ahighe mean of ear number in plant, grain No. / row, 300 grain weight, grain yield (3.85, 7.50) ton/ ha, protein percentage (11.28, 11.19)% in two seasons respectively and ear row number in spring season and gave alowest percentage of infestation for both seasons as compared with other levels. There was asignificant effect (P<0.05) cruiser in adecrease percentage of in festation as well as in increase the mean of ear no./ plant, row no./ ear, grain no./ row in spring season and 300 grain weight, grain yield, protein percentage in both season. It was concluded that the genotypical IPA 5012 was superior over the genotypical Buhooth 106 in most studied characters. The addition of potassium in a level of 60 kg K/ ha with the control of cruiser had significantly reduced the infestation percentage of the insect and increased the yields of grains per unit area and inhanced their quality.

Effects of Nitrogen and Potassium Fertilization on Perennial Ryegrass Cold Tolerance During Deacclimation in Late Winter and Early Spring

Turf loss from freezing injury results in costly re-establishment, especially with turfgrasses such as perennial ryegrass (Lolium perenne L.) having poor low-temperature hardiness. Studies are limited as to the influence of N and K on cold tolerance during dehardening periods in late winter when grasses are most susceptible to freezing injury. The objective of this study was to evaluate perennial ryegrass low temperature hardiness during deacclimation in response to N and K and associated effects on crown hydration, median killing temperature (LT50), shoot growth rate, tissue K concentration, soil exchangeable K, and low temperature disease. Treatments included five rate levels of N (49, 147, 245, 343, and 441 kg·ha-1·yr-1) in all factorial combinations with 3 rate levels of K (49, 245, and 441 kg·ha-1·yr-1). Low temperature tolerance was assessed using whole plant survival and electrolyte leakage (EL). Interactions between N and K were detected for all field measurements. The effects of N and K on survival LT50 were detected only during late winter periods in February 2004, N and K differences were lost by March. Late winter cold survival was negatively correlated with crown moisture, growth rate, and tissue K. Tissue K concentrations ranged from 28.6 to 35.9 g·kg–1 DM while soil K ranged from 121 to 261 mg·kg–1. Soil extractable K was not correlated with tissue K. Survival and EL LT50 were uncorrelated due to N and K interaction. Survival LT50 ranged from –9.0 to –13.6 °C. Maximum cold hardiness occurred when low to moderate N (49 to 147 kg·ha-1·yr-1) was applied with medium-high to high levels of K (245 to 441 kg·ha-1·yr-1), which corresponded to soil exchangeable K levels ranging from 200 to 260 mg·kg–1. Alternatively, similar K fertilization and soil K levels combined with high rates of N (343 and 441 kg·ha-1·yr-1) increased freeze stress and low temperature fungi (Typhula incarnata). At N rates routinely applied to perennial ryegrass, higher soil extractable K beyond those levels currently recommended for optimum shoot growth could provide some benefit in enhancing cold hardiness. Late fall applied N did not appear to increase the potential for winter injury.

Efeitos de lâminas de água e fertirrigação potássica sobre o crescimento, produção e qualidade do tomate em ambiente protegido

Avaliaram-se os efeitos de lâminas de água e fertilização potássica sobre o crescimento e produção da cultura do tomate (Lycopersicon esculentum Mill.) híbrido Bônus F1, em ambiente protegido, num Latossolo Vermelho Distroférrico no Setor de Olericultura da Universidade Federal da Lavras, MG. Foram testadas as lâminas de água 40, 60, 80 e 100% Kc.Ev e as doses de 300, 500, 700 e 900 kg ha-1 de K2O (nitrato de potássio e cloreto de potássio). As fertirrigações foram iniciadas 10 dias após o transplantio, três vezes por semana, durante o ciclo da cultura, utilizando-se o sistema de irrigação por gotejamento. As lâminas de água aplicadas influenciaram o crescimento das plantas aos 30, 60 e 90 dias de idade, no entanto, não houve efeito da fertilização potássica e sua interação com lâmina de água nessas características e na produção dos frutos. O número de frutos comerciais Extra AAA, Extra AA e Extra A aumentou na proporção de 0,462; 0,681 e 1,038 frutos.planta-1, respectivamente, para cada 20% Kc.Ev de acréscimo sobre a lâmina de água aplicada. Brix e pectina aumentaram em função das lâminas de água até 100% Kc.E V, enquanto Brix, acidez total e pH aumentaram em função das doses de potássio até 700 Kg.ha-1 de K2O.

Phosphorus and Potassium Fertilization Effects on Growth Attributes and Yield of Two Sugarcane Varieties Grown on Three Soil Series

A two-year field trial was carried out in the seasons of 1997/98 and 1998/99 at Sennar Sugar Company (latitude 13° 33′N and longitude 33° 37′E), to investigate the effect of different levels of potassium (0, 72, and 144 kg K/ha) as K2O and phosphorus (0, 29 and 58 kg P/ha) as P2O5 on the performance of two sugarcane (Saccharum officinarum) varieties (Co 6806, Co 527) and their first ratoon grown on three soil series (Hagu, Nasr, and Dinder). The layout was a randomized complete block design arrangement using three replications. The results indicated that potassium application affected plant density and stalk diameter significantly. The stalk height of the plant cane and its first ratoon was positively affected only late in the season. In the ratoon, the effect was significant early in the season on all growth parameters. The yields of cane and sugar on Dinder series were raised significantly in response to potassium addition in plant cane and ratoon. Potassium increased yield of cane and sugar on Nasr soil and yield of sugar on Hagu soil significantly. Phosphorus addition, on the other hand, reflected a significant effect on stalk height, number of internodes and plant density of plant cane and ratoon early in the season. However, the increase in stalk height and plant density of ratoon continued as the season proceeded. In plant cane, phosphorus application significantly affected sugar yield on Hagu soil. Application of phosphorus to ratoon grown on Dinder and Hagu series resulted in significant increase of cane and sugar yields. Variety Co 6806 gave the best growth and yield compared with Co 527. Soil analysis revealed a depletion of extractable potassium after plant cane harvest. The reverse was true after ratoon harvest from Nasr and Hagu soil series. Soil available phosphorus decreased after cane cropping and increased after ratoon harvest, but both were mostly less than the initial amount before cane planting.

Effects of Potassium Rates and Sources on Fiber Quality Parameters in Four Cultivars of Cotton Grown in Aridisols

A field experiment was conducted using four cotton (Gossypium hirsutum L.) cultivars: CIM-448, CIM-1100, NIAB-Karishma, and S-12 supplied with four rates of potassium fertilizer (0, 62.5, 125.0, 250.0 kg K ha−1) and two sources of potassium fertilizer (K2SO4, KCl) to determine the effect of potassium fertilizer on fiber quality. Result showed that fiber quality parameters differed significantly in response to various potassium fertilizer levels and sources in different cultivars. Fiber length, fiber fineness, fiber strength, and fiber maturity ratio increased due to addition of potassium fertilizer. Sulphate of potash had an edge over muriate of potash in improving fiber quality parameters. Each of fiber quality parameters was positively correlated to potassium concentration in fiber tissues at maturity, potassium concentration in leaf tissues at bloom stage and ammonium acetate extracted- potassium in the soil. These investigations indicate that adequate potassium supply to developing fruit was an important determinant of lint parameters to produce quality cotton.

Long‐term impact of nitrogen and potassium fertilizers on yield, soil nutrients and biochemical parameters of tea

AbstractA field experiment was conducted with tea cultivar UPASI‐9 over a period of 9 years to evaluate the long‐term effects of nitrogen (N) and potassium (K) fertilizers on yield, biochemical parameters, soil and leaf nutrient status. The yield increase was as high as 66% over the control for N application of 450 kg ha−1 year−1. Polyphenol and amino acid contents increased with increase in K application rate. Positive and significant correlation was found between nitrate reductase activity and the amino acid content of the tea shoots. While ammoniacal nitrogen in the soil was not affected by the application of fertilizer, ammonium acetate extractable K increased. The failure to apply fertilizer resulted in depletion of the organic matter status of the soil. Although increased rate of nitrogen application increased the overall yield of made tea (kg ha−1 year−1), the specific yield (kg kg−1 N) declined. The soil tended to become acidic from frequent application of high doses of nitrogenous fertilizer. The leaf NK status was significantly influenced by the various treatments. Copyright © 2004 Society of Chemical Industry

Nitrogen, Phosphorus, and Potassium Fertilization Effects on Nutritional Composition of Lettuce

Lettuce (Lactuca sativa L.) is an essential salad crop in the American diet. Nitrogen (N), phosphorus (P), and potassium (K) are required for successful lettuce production and can influence lettuce quality. The objective of the study was to evaluate changes in nutritional composition of romaine (`Green Tower') and iceberg (`Sharp Shooter') lettuce in responses to N, P and K fertilization during fall production in Salinas, Calif. Sixteen treatment combinations of fertilizer were selected to provide a range of treatments. N was applied at 0, 112, 225, and 338 kg·ha-1 as ammonium nitrate; P was applied at 0, 112, and 225 kg/ha as super phosphate; and K was applied at 0 and 112 kg·ha-1 as muriate of potash. Nutritional content of fresh tissue of two types of lettuce was analyzed using high performance liquid chromatography (HPLC). Among the parameters analyzed were lutein, beta-carotene, chlorophyll a, and chlorophyll b. Yield was increased with increasing N fertilizer level, but was not affected by P or K application rates. The best post harvest quality, however, was at moderate P application rate. Increasing the N and P rates gradually increased glucose content in lettuce but decreased the shelf life. Significant differences between the two types of lettuce were found in chlorophyll, lutein and beta-carotene content. No significant correlations were found between soil fertilizer application levels and nutritional content of lettuce. However, the ratio of chlorophyll a and b were greater with the increase of fertilizer rate. Nutritional composition including vitamin C will be presented.

Effect of potassium fertilization on yield and seeds quality of Pea Enword cv.

The study was conduct at the experimental field of Agriculture College /AL-Anbar University -Ramadi. During fall season 2003 and spring season 2004 .to study effect of potassium fertilizer ( K2SO4 ) on yield and seeds quality of pea Pisum sativum Enword CV. the treatments are ( zero, 50 ,75 , 100 ) Kg/d . The result showed that the 75 Kg treatment is the highest of total crop1.06 and 0.75 ton/d, pods No. / plant21.60 and 17.43 , seeds weight /pod 2.28 and 3.02 gm, dry seeds weight /pod 0.69 gm and 0.64 gm,(%) protein / seeds 21.2% and 22.40% and ( % )carbohydrate/seeds 58.90 % and 63.80 ,but no significantly difference between 75 and 50 kg/d for both seasons respectively . While the fertilization treatments was no significantly affected at early crop, pod length, seeds No. / Pod and (%) fiber / seeds.

Effect of nitrogen and potassium fertilisation on vegetative growth and flowering of mature carob trees (Ceratonia siliqua): variations in leaf area index and water use indices

This work aimed to assess how potassium (K) and nitrogen (N) fertilisation may affect the use of precipitation in terms of vegetative and flowering response of 15-year-old carob trees during a 3-year experiment. A��field trial was conducted in 1997, 1998 and 1999 in Algarve (Southern Portugal) in a calcareous soil. Four fertilisation treatments were tested: no fertiliser (control); 0.8 kg N/tree (N treatment); 1 kg K2O/tree (K treatment) and 0.8 kg N/tree plus 1 kg K2O/tree (NK treatment). No irrigation was applied during the experimental period. Branch length increments were measured every month throughout the growing season and inflorescence number was registered once per year. There was a strong seasonal effect on vegetative growth, since low levels of precipitation (115 mm) during October 1998–March 1999 suppressed the increment in branch length. N supplied to the trees (N and NK treatments) tended to increase water use indices in terms of vegetative growth. No response to K alone was observed in trees fertilised only with K. The number of inflorescences increased throughout the experimental period, particularly for N and NK treatments, and a reduction of the precipitation amount during April, May and June, may also enhance flowering. This knowledge could be important when making decisions concerning fertilisation under dry conditions. The results reported here indicate that tree growth (expressed as the branch growth) and flower production under dry-farming conditions, may be achieved by applying 0.8 kg of N (as ammonium nitrate)�per tree during the growing season. However, N uptake and use depends on soil water availability.

Effects of Potassium Rates and Sources on Fiber Quality Parameters in Four Cultivars of Cotton Grown in Aridisols

Abstract A field experiment was conducted using four cotton (Gossypium hirsutum L.) cultivars: CIM-448, CIM-1100, NIAB-Karishma, and S-12 supplied with four rates of potassium fertilizer (0, 62.5, 125.0, 250.0 kg K ha−1) and two sources of potassium fertilizer (K2SO4, KCl) to determine the effect of potassium fertilizer on fiber quality. Result showed that fiber quality parameters differed significantly in response to various potassium fertilizer levels and sources in different cultivars. Fiber length, fiber fineness, fiber strength, and fiber maturity ratio increased due to addition of potassium fertilizer. Sulphate of potash had an edge over muriate of potash in improving fiber quality parameters. Each of fiber quality parameters was positively correlated to potassium concentration in fiber tissues at maturity, potassium concentration in leaf tissues at bloom stage and ammonium acetate extracted- potassium in the soil. These investigations indicate that adequate potassium supply to developing fruit was an important determinant of lint parameters to produce quality cotton.

Effect of Potassium and Nitrogen Fertilizers on the Growth and Biomass of Some Halophytes Grown under High Levels of Salinity

Effect of Potassium and Nitrogen Fertilizers on the Growth and Biomass of Some Halophytes Grown under High Levels of Salinity

Efeitos de dose de nitrogênio, fósforo e potássio sobre os componentes da produção e a qualidade de bananas 'Prata Anã' no distrito agroindustrial de Jaíba

Com o objetivo de verificar os efeitos da adubação nitrogenada, fosfatada e potássica sobre os componentes da produção e a qualidade de bananas 'Prata Anã', no Distrito Agroindustrial de Jaíba, em Matias Cardoso-MG, foi conduzido um experimento com dez tratamentos constituídos pela combinação de doses (g/touceira) de N, P e K de acordo com uma matriz baconiana, sendo 1: 250-45-700, 2: 250-25-700, 3: 250-70-700, 4: 250-100-700, 5: 250-45-300, 6: 250-45-500, 7: 250-45-1000, 8: 150-45-700, 9: 400-45-700, 10: 600-45-700. O tratamento um é o de referência, correspondendo às doses adotadas pelos bananicultores da região. O delineamento foi de blocos ao acaso com quatro repetições. Avaliou-se a produção do primeiro ciclo. Os cachos foram colhidos, despencados e avaliados quanto ao número de pencas, número de frutos e massa do cacho, massa média das pencas e massa média, diâmetro e comprimentos total e comercial do fruto. Os resultados indicaram que as doses de nitrogênio ou fósforo utilizadas pelos produtores de banana do Distrito Agroindustrial de Jaíba podem ser reduzidas para 150 ou 25 g/touceira, respectivamente, sem prejuízo para a produção e qualidade dos frutos. Por outro lado, as doses de potássio até 1000 g/touceira, parceladas semanalmente, proporcionaram aumentos significativos na massa, comprimento total e comercial do fruto.