Kg Ha-1 Of K2O Research Articles

Fertilization with Silicon in Sweet Pepper Improved Plants Grown under Salt Stress

Aims: The objective of this research was to investigate the effect of calcium silicate on gaseous exchanges and production factors in the sweet pepper, cultivated under conditions of soil salinity induced by potassium fertilization, in protected cultivation.
 Study Design: The experiment was arranged in a randomized complete block design in a 2 × 5 factorial scheme with five replications.
 Place and Duration of Study: The experiment was conducted in the sector of Olericultura and Experimentation of the course of Agronomy from October 12, 2018 to February 2019.
 Methodology: The experiment was arranged in a randomized complete block design in a 2 × 5 factorial scheme (two sources of correction: calcareous and silicon and five increasing rates of KCl equivalent to 150, 300, 450, 600 and 700 kg ha-1 of K2O). Ten treatments with five replicates where each experimental unit consisted of a polyethylene pot, with a volume of 19 dm3. The electrical conductivity, the determination and quantification of silicon in soil and plant, liquid photosynthesis, stomatal conductance, intercellular CO2 concentration, transpiration, water use efficiency and instantaneous carboxylation efficiency were analyzed.
 Results: With the increase of K2O in the soil there was a tendency of reduction in liquid photosynthesis, transpiration, stomatal conductance, intercellular CO2 concentration, water use efficiency and instantaneous carboxylation efficiency in the presence and absence of calcium silicate. Higher rates of K2O (300, 450 and 600 kg ha-1) reduced the length and yield of sweet pepper fruits in the presence and absence of calcium silicate. The rate of 150 Kg K2O favored the growth of sweet pepper plants in the presence of calcium silicate.
 Conclusion: It is concluded from the research that the dose of 300 kg ha-1 of K2O, in the presence of calcium silicate, provided the best results for the electrical conductivity of 2.76 dS m-1, silicon content in the soil of 5.70 mg kg-1, 14% silicon leaf content, improving photosynthetic rates, transpiration, water use efficiency and fruit production. The increase in salinity reduced fruit yield, in the presence and absence of Si.

Fertilization With Nitrogen, Phosphorus and Potassium on Soil Fertility and Nutritional Status of Yellow Passion Fruit Plants

The research had as objective to study the influence of the doses of nitrogen, phosphorus and potassium on soil fertility and nutritional status of yellow passion fruit plants. The experimental design was in randomized blocks in an incomplete fractioned factorial 1/2 (4 × 4 × 4), with four doses of N (150, 300, 600 and 1200 Kg-1 ha-1 yr-1 N); four doses of P2O5 (200, 400, 800 and 1600 kg-1 ha-1 yr-1) and four doses of K2O (100, 300, 500 and 700 kg-1 ha-1 yr-1). The fertilizers used were the ammonium nitrate = 32% N; triple superphosphate = 44% P2O5 and potassium chloride = 60% K2O. In the fertility of the nitrogen fertilization increased the content of phosphorus and sulfur. The doses of P2O5 increased the concentration of P in the soil. The doses of K2O influenced the increase in the content of K in the soil in the harvest 2013/2014. There was an interaction of the doses of N and K2O in the availability of K in the soil in the harvest 2012/13 with the maximum levels of K, in the doses of 200-400 kg N ha-1 and 600 to 700 kg ha-1 of K2O. In the nutritional state the yellow passion fruit plants was influenced by the doses of N for the sulfur content of the leaves. The maximum content of S leaf concentration of 3.63 g kg-1 was obtained in the dose estimated at 1120 kg ha-1 of P2O5.

Doses and Application Seasons of Potassium in the Soybean-Corn Succession in Soil With Improved Fertility in the Southwest of Goiás

Soils with improved fertility indicate opportunities for more rational use of fertilizers. The objective of this study was to evaluate the management of potassium fertilization in the succession of soybean-corn in soil with improved fertility, in the southwestern region of the state, Goiás. The experiment was set in 5×3 factorial scheme, arranged in randomized blocks with four repetitions. The treatments consisted of the combination of potassium doses (0, 40, 80, 120 and 160 kg ha-1 of K2O) and seasons of application (100% of the dose in pre-planting, 100% of the dose in coverage and in installments with 50% of the dose in pre-planting + 50% in coverage). The best performance of soybean, considering grain yield, was obtained with the parceled application of 80 kg ha-1 of K2O, with production of 3.6 Mg ha-1. The highest corn production was obtained with the anticipated application of 160 kg ha-1 of K2O in soybean. In the management of potassium fertilization in improved fertility soil in the soybean-corn succession, the parceled application of 120 kg ha-1 of K2O kept the available K reserve in the soil constant when compared to its initial content.

Yield and quality in 'Caipira' melon in fertilization function

Objetivou-se com este trabalho avaliar o efeito de diferentes adubações e coberturas do solo na produtividade e qualidade dos frutos de melão ‘Caipira’ (Cucumis melo var. acidulus) irrigado em condições semiáridas tropicais. O delineamento experimental utilizado foi em blocos ao acaso em arranjo fatorial 3x2, com três repetições. Foram comparados três manejos de adubação (F1 - Somente adubação mineral em fundação, F2 - adubação mineral mais orgânica em fundação, F3 - adubação mineral em fundação mais adubação foliar) em condições de solo descoberto e coberto com mulching preto. Avaliaram-se cinco plantas úteis por parcela. Em todas as parcelas foi aplicada em fundação a quantidade da adubação mineral recomendada para a cultura (40 kg ha-1 de Nitrogênio, 120 kg ha-1 de P2O5 e 40 kg ha-1 de K2O). Avaliou-se a massa média de fruto (kg), produtividade (t.ha-1), comprimento e diâmetro dos frutos (cm), espessura da polpa (cm), cavidade interna (cm) e sólidos solúveis totais (°Brix). Realizou-se a comparação das médias entre as adubações e coberturas do solo a partir do teste de Tukey com 5% de probabilidade. O uso de adubação mineral associada à orgânica em fundação proporcionou resultados superiores para as variáveis analisadas, exceto para sólidos solúveis totais e cavidade interna do fruto. O uso de mulching foi responsável por elevar a massa média dos frutos, a produtividade e o teor de sólidos solúveis totais do melão ‘Caipira’.

Doses and potassium partitioning methods in soybean production components in an Amazonian savanna

After nitrogen, potassium is the macronutrient most required by soybean. To meet soy bean growth
 demands, it is necessary to use high K doses, which can lead to losses via leaching. The objective of the
 current study was to evaluate the effect of doses and methods of K fertilization on the components of soybean
 production, in the Yellow Latosol of an Amazonian savanna. The experiment was conducted using randomized
 complete block design with four replicates. Plots consisted of two fertilization methods (M1 – fertilization on
 planting and at 35 days after emergence - DAE and M2 – on planting, then divided between 20 and 35 DAE).
 Subplots where five doses of potassium (K2O at 0, 40, 80, 120 and 160 kg ha-1) were randomized. Measured
 variables were: plant stand (PS), plant height (PH), height of first pod insertion (FP), number of pods per
 plant (PP), bean mass per plant (BM), and bean yield (BY). Because of the low exchangeable K content and
 medium texture of the study soil, deployed methodology consisting of plant fertilization and two applications
 to facilitate high soybean yields. Agronomic efficiency proved to be a good indicator for assaying the best K2O
 dose, as it is sensitive to initial soil exchangeable K levels. The dose giving maximum agronomic efficiency
 was 88.5 kg ha-1 of K2O, converting each kg of K2O in 14.3 kg of soybeans.

POTASSIUM FERTILIZATION FOR OPTIMIZATION OF ONION PRODUCTION

ABSTRACT Information about the response of onion to different potassium doses may contribute to optimizing the use of fertilizers and, consequently, make the activity more profitable and environmentally sustainable. In this context, the aim of this study was to evaluate the effects of doses of potassium on onion yields. Two field experiments were carried out in the periods of September to December 2012 and April to July 2013. The experimental design used was completely randomized blocks with four replications. The treatments corresponded to the potassium doses (0, 36, 72, 108, 144 and 180 kg ha-1 of K2O). Potassium fertilization promoted an increase in the content of K in the leaf, commercial and total yield, with the maximum obtained in the dose of 180 kg ha-1 of K2O. The maximum overall and commercial yields were respectively 54.69 and 54.12 t ha-1 in the experiment of September to December 2012 and 47.39 and 46.39 t ha-1 in that of April to July 2013.

Phosphorus and potassium fertilization increase common bean grain yield in Mozambique

ABSTRACT There is little information about common bean fertilization in African Savannas. The objectives of this study were as follows: i) to evaluate the common bean yield potential in the environmental conditions of Lichinga, Niassa, Mozambique, and ii) to determine the common bean response to phosphorus and potassium fertilization applied together in order to verify whether the interpretation of soil analysis for the Brazilian Cerrado could be adopted for Savanna soils in Mozambique. The experimental design was a randomized block design in a 5 x 4 x 2 factorial arrangement. Treatments consisted of a combination of phosphorus doses (0, 35, 70, 140 and 280 kg ha-1 of P2O5), potassium doses (0, 50 100 and 200 kg ha-1 of K2O), and different growing seasons (2012/2013 and 2013/2014). The field rainfed experiments were conducted in Lichinga city, province of Niassa. Common bean crops presented high productivity potential in rainfed systems in the environmental conditions of Lichinga, Niassa, Mozambique, reaching grain yields of up to 3,600 kg ha-1 depending on the rates of fertilization with phosphorus and potassium. Common beans responded to phosphorus and potassium fertilization despite high contents of these nutrients in the soil, according to the interpretation of soil analysis for the Brazilian Cerrado. Maximum grain yield in the average of two growing seasons was estimated to occur for 239 kg ha-1 of P2O5 and 141 kg ha-1 of K2O, indicating that further calibration studies for P and K are required for this specific region of Mozambique.

Quality of ‘Imperial’ pineapple infructescence in function of nitrogen and potassium fertilization

The quality aspects of pineapple infructescences are influenced by nutritional management. Thus, the objective was to evaluate the physical-chemical characteristics of the infructescences of cv. Imperial, submitted to fertilization with nitrogen (N) and potassium (K). The experimental design was a randomized complete block design with three replicates and the treatments were arranged in a factorial scheme according to the Plan Plueba III matrix, which consisted of a combination of five doses of N: 15; 90; 150; 210 and 285 kg ha-1 and five doses of K: 21.6; 129.6; 216.0; 302.4 and 410.4 kg ha-1.The measured characteristics of the infructescencewere fresh mass; length; diameter; firmness; yield of pulp and crown; coloring of the shell and pulp; soluble solids (SS); titratable acidity (TA); SS/AT ratio and ascorbic acid. The elevation of the K2O doses to 410.4 kg ha-1 increased the infructescence mass with crown, length and diameter of the infructescence and the soluble solids content, being harvested in the plants that received this fertilization, infructescence with the average values of 632.34 g, 9.0 cm, 84.80 mm and 16.42%, respec­tively. Plants that received N doses of 285 kg ha-1 favored pulp yield, a * and b * coloring index of the bark and the SS/AT ratio, giving mean values of 44.50%, 9.64, 33.06 and 30.10, respectively. Doses of 285 kg ha-1 of N and 410.4 kg ha-1 of K2O promote improvements in the physical-chemical characteristics of infructescences of ‘Imperial’ pineapple.

Soybean agronomic performance in response to seeding rate and phosphate and potassium fertilization

ABSTRACT Most studies that found soybean high phenotypic plasticity under different seeding rates adopted the same fertilization levels used for the recommended seeding rates. Therefore, the interaction between these factors is little known. This study aims to assess the interaction between seeding rate and levels of phosphorus and potassium fertilization on soybean growth, grain yield and contents of protein and oil in the grains. The experiment was carried out under a randomized complete block design, in a split-plot scheme, with six replicates. Four seeding rates (150, 300, 440 and 560 thousand viable seeds ha-1) were used in the plots, and two levels of phosphorus and potassium fertilizer were applied in the subplots to meet the export of 3 and 6 t ha-1 of grains (level 1 = 30 kg ha-1 of P2O5 + 60 kg ha-1 of K2O; and level 2 = 60 kg ha-1 of P2O5 + 120 kg ha-1 of K2O). There was no interaction between the experimental factors. Increase in fertilizer doses did not alter the evaluated characteristics, regardless of the seeding rate. Seeding rate did not change grain yield or protein and oil contents, but at low densities there was an increase in the number of pods per plant, apparent harvest index and SPAD index.

Nitrogen and potassium in cover fertilization of cotton in latossols with different clay content

Nitrogen and potassium are the most extracted nutrients by cotton, making necessary the replacement by fertilization. Thus, the present study aimed to evaluate the cotton yield under different nitrogen and potassium doses as cover fertilization in latosols with different textures, in a ‘Cerrado’ biome area. The experiment was carried out at the Harmonia Farm, municipality of Sapezal – MT, Brazil. The experiment was carried out in a randomized blocks design, with four repetitions. Treatments were arranged in an incomplete fractional triple factorial scheme (3/4)42 x 2, totaling 72 experimental units. The N doses consisted of 46, 69, 92 and 115 kg ha-1 and the four K2O doses of 62, 93, 124 and 155 kg ha-1, with different combinations for the cover fertilization of the cotton crop, in two areas, one with 420 and other with 625 g kg-1 of clay. Cotton yield depends on the soil clay content. Appropriate doses of N and K, applied together on cover can increase the cotton yield in 1508 kg ha-1, when compared to control. Under the experimental conditions, it is suggested the application of 78 kg ha-1 of N and 155 kg ha-1 of K2O as cover fertilization for a soil with 420 g kg-1 of clay and 71 kg ha-1 of N and 124 kg ha-1 of K2O as cover fertilization on soils with the clay content of 625 g kg-1.

Potassium doses in previous crops and effect on soybean in succession

ABSTRACT Early potassium fertilization in previous crops may be beneficial to the main crop in succession. The objective of this study was to investigate the behavior of the soybean crop as a function of potassium (K) doses in the previous crops, associated or not with K application in soybean. The experiment was carried out from 2012 to 2015 in an experimental area of the Faculty of Engineering, UNESP, Campus of Ilha Solteira-SP, located in Selvíria-MS, Brazil. For the previous crops, a randomized block design was used in a 3 x 4 factorial scheme with four replications, i.e., three previous crops (maize, sorghum and millet) and four K doses (0, 35, 70 and 120 kg ha-1 of K2O). For soybean in succession, a randomized complete block design was used in the split-plot scheme. The treatments were arranged in a 3 x 4 x 2 factorial scheme with four replicates, i.e., soybean sowing on three types of straw (maize, sorghum and millet), residual of the four K doses and with or without top-dressing K fertilization in the soybean. Millet accumulated higher K content in comparison to maize and sorghum. The return of K to the system by millet is similar to that by maize. Potassium doses in the previous crops do not alter their dry matter production and K content. Potassium fertilization in the soybean crop in succession to millet allows higher yields.

Physiological quality of parsley seeds in relation to doses of nitrogen and potassium

Parsley seeds [Petroselinum crispum (Mill.) Nyman ex AW Hill] must have germinations higher than 70%. But seed companies have found difficulties to get the minimum standards of germination established for this species, because of the slow and irregular germination after harvesting. The aim of this study was to evaluate the effect of nitrogen and potassium fertilization on the physiological quality of parsley seeds. The experiment was conducted in Bozano – RS. Factorial arrangement was 3x3 (3 doses of N and 3 doses of K2O). Increasing doses of potassium (0, 50 and 100 kg ha-1 of K2O) and nitrogen (0, 100 and 200 kg ha-1 of N) were applied. For the evaluation of the physiological quality of the lots in laboratory, a completely randomized design experiment was performed with the following tests: 1,000-seed weight, standard germination test, first-count germination, germination speed index, and electrical conductivity. Nitrogen and potassium coverage interfere with the physiological quality of parsley seeds. The best lots were obtained using the dose of 100 kg ha-1 nitrogen and 50 kg ha-1 potassium. Dosage of 200 kg ha-1 N will increase vigor and seed weight.

Nutrição mineral, densidade de plantio, caracterização biométrica e fenológica de Rumex acetosa L.

The sorrel (Rumex acetosa L.) is an example of underutilized human food specie, characterized as unconventional vegetable in Brazil. There is little information on the suitable technical for the agricultural production. The objective was to evaluate the crop behavior at different levels of fertilization, evaluate the behavior of the crop when conducted at different planting densities, as well as to characterize the phenological stages of this specie. The statistical design adopted was randomized blocks, with split plots. The production rate of sorrel varied significantly when culture were subjected to different levels of spacing and fertilization, and the best productive results obtained from the crops 75 Mg ha-1. The crop was most productive when conducted in less dense spacing, corresponding to 30 cm between plants per 35 cm between rows, when in combination to fertilization of 150 kg ha-1 of N, 60 kg ha-1 of K2O and 100 kg ha-1 of P2O5. The cycle of crop, from planting to harvest, was established in 100 days after planting.

Effect of biofertilizer obtained by anaerobic digestion of cassava effluent on the development of crambe plants

ABSTRACT This study aimed to evaluate the effect of applying increasing doses of biofertilizer obtained by the anaerobic digestion of cassava effluent on the development of crambe plants. The experiment was conducted in a protected environment at the Federal University of Paraná (UFPR), Palotina Sector, between April and August 2015. A completely randomized design was used, and five different treatments with the following doses were applied in five replicates: 0, 40, 80, 120, and 160 kg ha-1 of K2O. The following parameters related to plant development were evaluated: final height, stem diameter, number of branches, dry shoot and root biomass, mass of the grains, and oil content. The 160 kg K2O ha-1 dose was found to have the best influence on the plant development, because all the measured parameters reached their highest values at this dose, except for oil content, which attained the highest percentage in the case of the control treatment (0 kg ha-1 of K2O). This study proved that the biofertilizer obtained by anaerobic digestion of cassava effluent can be used as an alternative to regular fertilizers in cultivating crambe.

POTASSIUM FERTILIZATION AND SOIL MANAGEMENT SYSTEMS FOR COTTON CROPS

ABSTRACT Cotton has great socio-economic importance due to its use in textile industry, edible oil and biodiesel production and animal feed. Thus, the objective of this work was to identify the best potassium rate and soil management for cotton crops and select among cultivars, the one that better develops in the climatic conditions of the Cerrado biome in the State of Goiás, Brazil. Thus, the effect of five potassium rates (100, 150, 200, 250 and 300 kg ha-1 of K2O) and two soil management systems (no-till and conventional tillage) on the growth, development and reproduction of four cotton cultivars (BRS-371, BRS-372, BRS-286 and BRS-201) was evaluated. The data on cotton growth and development were subjected to analysis of variance; the data on potassium rates were subjected to regression analysis; and the data on cultivars and soil management to mean test. The correlation between the vegetative and reproductive variables was also assessed. The conventional tillage system provides the best results for the herbaceous cotton, regardless of the others factors evaluated. The cultivar BRS-286 has the best results in the conditions evaluated. The cultivar BRS-371 under no-till system present the highest number of fruiting branches at a potassium rate of 105.5% and highest number of floral buds at a potassium rate of 96.16%. The specific leaf area was positively correlated with the number of bolls per plant at 120 days after emergence of the herbaceous cotton.

Soybean response to NPK fertilization of sowing and potassium at topdressing in soil of improved fertility

The introduction of indeterminate habit soybean cultivars expanded the possibilities of rotation or succession crops in producing areas of the Cerrado region, but it represents a less well-known component in the management of soil fertility. The objective of this work was to verify the agronomic and economic response of indeterminate habit soybean to the variations in NPK fertilization of sowing and potassium at topdressing in an improved fertility Latosol in Campos das Vertentes (MG). The experimental design was in randomized blocks, with subdivided plots in three replications. In plots, the treatments consisted of doses of 315 and 485 kg ha-1 of NPK 02-30-10 formulation in the sowing furrow and, in the subplots, the application of 0, 15, 30 and 45 kg ha-1 of K2O in topdressing at 21 days after sowing was tested. There is no significant difference in the variation of sowing fertilization, but productivity increases linearly by the additional input of potassium at topdressing. Soybean cultivar requires more K2O in maintenance fertilization in soil of improved fertility to express productive potential near 4 t ha-1, which is economically rewarding.

Genotype selection and addition of fertilizer increases grain yield in upland rice in Suriname

ABSTRACT The upland rice farmers in Suriname use local varieties and low level technologies in the field. As a result, the upland rice grain yield is low, at about 1 000 kg ha-1. Our objective was to evaluate the use of upland rice cultivars from Suriname and Brazil, and the effect of nitrogen, N, phosphorus, P, and potassium, K, fertilizers on cultivation variables. We undertook four field trials in the Victoria Area, in the Brokopondo District, using a randomized block design each with four replications. The most productive rice varieties were BRS Esmeralda (grain yield 2 903 kg ha-1) and BRS Sertaneja (2 802 kg ha-1). The highest grain yield of 2 620 kg ha-1 was achieved with a top dressing application of 76.41 kg N ha-1 20 days after sowing. For P, the highest grain yield of 3 085 kg ha-1 was achieved with application of 98.06 kg ha-1 P2O5 applied at sowing. An application rate of 31.45 kg ha-1 of K2O at sowing achieved the highest grain yield of 2 952 kg ha-1. Together, these application rates of N, P and K resulted in rice grain yield of about 3 000 kg ha-1, which is three times greater than the national average for upland rice. We demonstrate that the use of improved rice varieties matched to the local conditions, and application of appropriate fertilizers, are management practices that can result in significant increases in rice grain yield in Suriname.

Ácido naftalenoacético associado à adubação potássica na brotação de café conilon

Os gastos com mão de obra podem representar mais de 50% do custo total de produção do café Conilon, sendo a poda e a desbrota responsáveis por maior parte desses custos, ficando atrás somente dos gastos com colheita. Alguns fitorreguladores de crescimento do grupo das auxinas associados ao potássio (K2O) podem reduzir a emissão de brotos. Objetivaram-se com o trabalho verificar o efeito do ácido naftalenoacético (ANA) associado à adubação potássica na brotação de café Conilon. O experimento foi realizado de junho de 2014 a dezembro de 2015, em lavoura adulta de café Conilon não irrigada, da cultivar “G35-Verdebrás”, localizada no Instituto Federal do Espírito Santo – Campus Santa Teresa. Utilizaram-se o delineamento em blocos casualizados, com o arranjo fatorial 5x4 entre níveis de ANA e níveis de K2O, respectivamente. Foram empregadas cinco doses de ANA (0, 50, 100, 250 e 500 mg L-1), e quatro de K2O na adubação, (60, 120, 240 e 480 kg ha-1). Observou-se que a aplicação de ANA influencia a emissão de brotos por favorecer a dominância apical das plantas. Os níveis aplicados de K2O interferem na ação do ANA, sendo que a aplicação de dosagens elevadas do nutriente pode inibir a ação deste fitorregulador. A aplicação de 344 mg L-1 de ANA associada à adubação de 120 Kg ha-1 de K2O reduziu o número de brotos por planta sem interferir na produtividade e desenvolvimento das brotações remanescentes.

PHOSPHATE AND POTASSIUM FERTILIZATION FOR RADISH GROWN IN A LATOSOL WITH A HIGH CONTENT OF THESE NUTRIENTS

ABSTRACT The intensive cultivation of vegetables with frequent chemical fertilization may cause accumulation of nutrients in the soil. This, in turn, may reduce crop yields and damage the environment due to contamination of ground water and rivers. Thus, to increase the effects of P (0, 100, 200, 300 and 400 kg ha -1 of P2O5) and K (0, 60, 120, 180 and 240 kg ha-1 of K2O) doses on the growth and productivity of radish cultivars (Sakata 19 and Sakata 25) in a soil with high levels of these nutrients, two experiments were conducted in randomized blocks with the factors cultivars and doses arranged in a 2 x 5 factorial design with three replications. Number of leaves per plant, leaf area, shoot and root dry mass, total and commercial productivity, percentage of cracked roots and P and K contents in the plant and in the soil were evaluated. The Sakata 19 cultivar performed better than the Sakata 25 in both experiments. The fertilization with P or K did not influence the growth and the productivity of both radish cultivars. Therefore, both cultivars of radish evaluated do not need to be fertilized with P and K when planted in a Latosol with high levels of these nutrients.

English

This study aimed to evaluate the effect of different doses of nitrogen and potassium applied through fertirrigation on yield characteristics of Italian Zucchini, Novita Plus cultivar. The experiment was conducted in a greenhouse at the Irrigation Technical Center of the State University of Maringa, Maringa - PR, adopting a completely randomized design in a 4 x 4 factorial scheme, with three replications. Four doses of nitrogen (0, 90, 180 and 270 kg ha-1) and four doses of potassium (0, 90, 180 and 270 kg K2O ha-1) were tested. The fertirrigation was applied via micro irrigation through drip emitters in a continuous line, operating at a flow rate of 4 L h-1. Number of leaves, number of male and female flowers, average yield and mass of fruits per plant were evaluated. There was an increase in leaf production at the maximum nitrogen dose, as well as an increase in the number of male flowers at the maximum dose of nitrogen and potassium. The number of female flowers was influenced only by nitrogen, with an increase in the number of flowers at the highest nitrogen levels. Regarding the fruit yield, the best obtained doses were 179.19 kg ha-1 of N and 171.25 kg ha-1 of K2O. Finally, the doses that expressed maximum fruit mass gain were 136.92 kg ha-1 of N and 184.17 kg ha-1 of K2O. Key words: Cucurbita pepo L., cucurbitacea, sexual expression, production, nitrogen metabolism.