PPGEA

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Navegando PPGEA por Assunto "Adubação nitrogenada"

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    Algodoeiro fertirrigado por gotejamento sob doses de nitrogênio, lâminas de água e espaçamentos de plantio
    (Universidade Federal de Mato Grosso, 2015-12-15) Sousa, Jackelinne Valéria Rodrigues; Silva, Tonny José Araújo da; 781.203.064-49; http://lattes.cnpq.br/0651075688988405; Silva, Tonny José Araújo da; 781.203.064-49; http://lattes.cnpq.br/0651075688988405; Silva, Edna Maria Bonfim da; 960.432.454-34; http://lattes.cnpq.br/8660058048761423; Teixeira, Marconi Batista; 028.530.536-01; http://lattes.cnpq.br/6394236673481626; Guimarães, Salomão Lima; 925.317.505-25; http://lattes.cnpq.br/9250168755115649
    In Brazil, research on irrigation in cotton are still quite scarce. Thus, the aim of the present study was to evaluate the development and productivity of upland cotton grown in Cerrado Oxisol due to the nitrogen fertilization, irrigation levels and crop spacings. The experiment was conducted under field conditions in the experimental area of the Master's Degree in Agricultural Engineering from the Federal University of Mato Grosso (UFMT/CUR). The experimental design was randomized blocks in Box-Behnken design. This planning is based on experiments with balanced incomplete block containing factors with three levels (low, intermediate, high). The variables were evaluated statistically with analysis of response surface, totaling 15 treatments and 4 replications (blocks). The treatments were: three cultivation spacing (dense – 40 cm, intermediate - 70 cm and conventional - 100 cm), three doses of nitrogen fertilizer fertigation (low dose - 31 kg ha-1, intermediate dose - 171 kg ha-1 and High dose - 310 kg ha-1) and three irrigation levels via drip subsurface (severe - 30% of the demand of ETc, intermediate - 90% and water surplus - 150%).Growing gaps were defined according to current recommendations of the productive system for cotton in Mato Grosso, the treatment of fertigation was based on the recommendation for cotton growing, according to the soil fertility analysis. The irrigation levels were applied with reference to the irrigation levels were applied with reference to the crop evapotranspiration (ETc) calculated from the reference evapotranspiration (ETo) estimated by the Penman-Monteith method (FAO). crop evapotranspiration (ETc) calculated from the reference evapotranspiration (ETo) estimated by the Penman-Monteith method (FAO). Daily surveys were conducted of the growth stage of the plant and Ratings at 45, 75 and 105 days after sowing (DAS) for plant height and SPAD chlorophyll content. After harvest (141 days) were evaluated: number of bolls per plant, boll weight, dry weight of cotton, dry mass of reproductive structure, shoot dry mass, lump in productivity and feather, fiber yield and HVI features (High Volume Instrument). The results were analyzed in response surface through software "SigmaXL® 7.0". There was no significant interaction between irrigation levels, nitrogen levels and growing gaps for plant height and SPAD chlorophyll index at 45 DAS, boll weight, dry weight of boll, dry mass of reproductive structure, fiber yield and characteristics HVI. Nitrogen fertilization increases plant height at 75 and 105 DAS, number of bolls, dry weight of shoot and seed productivity. The SPAD chlorophyll index was positively influenced by the irrigation depth to 75 DAS and also by nitrogen fertilization to 105 DAS. Productivity plume was higher when applied blade 150%. Efficiency in water use showed better results on slide 30%. The maximum yield of cotton seed (2459 kg ha-1) was obtained in 169.2% nitrogen level. For all variables, we obtained better responses in dense and intermediate cultivation. The irrigation management, crop spacing and the nitrogen fertilization provides gains in cotton yield, positively influencing the development of cotton plants grown in Oxisol in the Cerrado.
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    Características fitométricas de trigo adubado com nitrogênio : potássio e nitrogênio : enxofre no cerrado mato-grossense
    (Universidade Federal de Mato Grosso, 2020-02-28) Paula, Raphael Pereira França de; Silva, Edna Maria Bonfim da; 960.432.454-34; http://lattes.cnpq.br/8660058048761423; Silva, Edna Maria Bonfim da; 960.432.454-34; http://lattes.cnpq.br/8660058048761423; Oliveira, Maria Aparecida Peres de; 975.423.931-20; http://lattes.cnpq.br/8667237742538392; Nunes, João Ângelo Silva; 012.065.511-00; http://lattes.cnpq.br/3575958560852266
    The wheat crop has been cultivated mainly in the southern region of Brazil, with the potential to expand to other regions such as the Midwest. High yields have been achieved in this region, due to genetic improvement, where cultivars are developed adapted to the region's climate and through fertilization management. The Cerrado soils have low natural fertility, however, with the correction of soil acidity and the application of fertilizers there is an increase in the productivity of agricultural crops. In this context, the objective was to evaluate the phytometric characteristics of irrigated wheat fertilized with combinations of nitrogen and potassium and nitrogen and sulfur in two consecutive years of cultivation in the Cerrado of Mato Grosso. Two experiments were carried out simultaneously: experiment 1: nitrogen / potassium combinations and experiment 2: nitrogen / sulfur in the years 2018 and 2019, in the experimental area of the Federal University of Mato Grosso, Campus de Rondonópolis. The statistical design used was in randomized blocks in a fractional 52 factorial scheme. In the first experiment five doses of nitrogen (0, 70, 140, 210 and 280 kg ha-1 ) were used with five doses of potassium (0, 50, 100, 150 and 200 kg ha-1 ) and in the second experiment five doses were used nitrogen (0, 70, 140, 210 and 280 kg ha-1 ) with five sulfur doses (0, 25, 50, 75 and 100 kg ha-1 ), with four replications. The analyzed variables corresponding to the growth and development of wheat plants occurred at 15, 30 and 45 days after emergence (DAE), evaluating plant height, number of leaves, number of tillers, lodging, ear length, ear diameter and stalk length in the two years of cultivation. The response variables were subjected to analysis of variance and regression test, both with up to 5% probability of error by Software R (R Core TEAM, 2018). The phytometric characteristics of Cultivar BRS 394 were influenced by the doses of nitrogen: potassium and nitrogen: sulfur applied to the soil. Combinations of nitrogen doses from 187.86 to 262.22 kg ha-1 combined with potassium doses from 74.62 to 183.92 kg ha-1 , provide the best responses to the evaluated phytometric and productive variables. And the combinations of nitrogen doses from 204.83 to 265.49 kg ha-1 with sulfur doses ranging from 3.16 to 131.76 kg ha-1 , provide the maximum results of the analyzed variables. Thus, nitrogen fertilization influenced by doses of potassium and sulfur applied to the soil, provide the best results for the cultivation of wheat cultivar BRS 394 grown in Cerrado mato grossense.
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    Cultura do milho submetida a tensões de água no solo e doses de nitrogênio
    (Universidade Federal de Mato Grosso, 2012-12-17) Schlichting, Alessana Franciele; Koetz, Marcio; 892.874.600-00; http://lattes.cnpq.br/8918968565917194; Koetz, Marcio; 892.874.600-00; http://lattes.cnpq.br/8918968565917194; Silva, Edna Maria Bonfim da; 960.432.454-34; http://lattes.cnpq.br/8660058048761423; Gomes Filho, Raimundo Rodrigues; 218.253.273-00; http://lattes.cnpq.br/9248687124030673
    Nitrogen fertilization combined with water availability are the most important factors for the development of corn, so the objective was to check the present study the influence of soil water stress and nitrogen fertilization in maize, in Oxisol. The experiment was conducted in a greenhouse at the Federal University of Mato Grosso, Campus Rondonópolis. We used a randomized block design in a factorial 5x5, corresponding to five soil water stress (15, 25, 35, 45 and 55 kPa) and five doses of nitrogen (0, 50, 100, 150 and 200 mg dm-3) with four replications, totaling 25 treatments, a total of 100 plots. The experimental units were represented by plastic pots of 18 dm3 soil. The corn hybrid used in the experiment was the DKB 390 PRO, classified as simple hybrid. Harvesting and evaluations were performed at 122 days after emergence, where the characteristics evaluated were: plant height, stem diameter, number of tassel branches, leaf dry weight, stem dry weight, dry weight tassel, dry shoot, root dry weight, height, first ear, cob with straw, cob without straw, cob dry weight, ear length and weight of 100 grains. Results were subjected to analysis of variance and regression testing, being used to this, statistical programs. In assessments where significant interaction occurred, the smallest voltages between 15 and 25 kPa, allied fertilizations 100-150 mg dm-3 nitrogen, provided the best results. The soil water tension of 55 kPa, was more damaging to the development of corn.
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    Milho safra submetido à inoculação com bactérias diazotróficas associativas e doses de nitrogênio
    (Universidade Federal de Mato Grosso, 2014-12-05) Moreira, Julio Cezar Fornazier; Guimarães, Salomão Lima; 925.317.505-25; http://lattes.cnpq.br/9250168755115649; Guimarães, Salomão Lima; 925.317.505-25; http://lattes.cnpq.br/9250168755115649; Oliveira, Maria Aparecida Peres de; 975.423.931-20; http://lattes.cnpq.br/8667237742538392; Canuto, Erineudo de Lima; 740.472643-34; http://lattes.cnpq.br/0853144858345068
    The diazotrophic bacteria is an important alternative nitrogen supply cultures. The aim of this study was to evaluate the effects of inoculation and nitrogen rates in the development, nutrition and production of the corn crop, grown in Mato Grosso. The experimental design was a randomized complete block with four replications and treatments arranged in a 4 x 3 factorial. The treatments consisted of inoculation of seeds (control, strain MTAz8, strain of MTh2 and commercial inoculant) and nitrogen rates (0, 55, and 110 kg ha-1). Inoculants were produced applied by pelleting the seeds, except the commercial inoculant was applied according manufacturer recommendations. Nitrogen rates was split in two applications of coverage. The relative leaf chlorophyll content, nitrogen content and dry mass of shoots, ear and plant height and stem diameter were evaluated during in three stages the maize cycle. After harvest, the components of grain yield, nitrogen contend and crude protein grains. There was significant interaction only for the production of dry mass of shoots. However, all parameters were influenced by nitrogen fertilization, except for stem diameter and 1000 grain weight. Inoculation associated nitrogen rates in coverage provided the highest average when seeds were not inoculated. Concluded that inoculation with diazotrophic bacteria provides yield effects and nitrogen fertilization promotes increases in development, nutrition and yield of corn grown in Mato Grosso, in the first growing season.