Características morfológicas e produtivas do capim-marandu adubado com fosfato natural reativo em solo de cerrado.

Bonfim-Silva, Edna Maria; Santos, Claudia Cardoso dos; Farias, Lorraine do Nascimento; Vilarinho, Marcella Karoline Cardoso; Guimarães, Salomão Lima; Silva, Tonny José Araújo da

doi:10.18227/1982-8470ragro.v6i2.756

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Silva et al (2012) that verified changes in the morphological and productive characteristics of the Marandu grass when they were submitted to increasing doses of natural reactive phosphate.…”

Section: Soil Chsupporting

confidence: 52%

Yield of Brachiaria in Function of Natural Phosphate Application and Liming in Pará Northeast

Araujo¹,

Rodrigues²,

Galvão³

et al. 2018

JAS

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Forage plants of the genus Brachiária show excellent adaptation to poor soils with high acidity in the region. They present good response to phosphate fertilization and tolerant to soil with higher humidity. The soils of Amazonia are characterized mainly by high acidity, low availability of phosphorus and high saturation of aluminum. Under these conditions, aluminum tends to fix the phosphorus, making it necessary to apply higher doses to supply the need for fodder, justifying the need to apply corrective acidity material. The objective was to evaluate the pH of the behavior and productivity of Brachiaria brizantha cv. Xaraés by using Arad rock phosphate and limestone dolomite in a yellow Latosol of medium texture collected from the 0-20 cm layer. The treatments were: soil only (T1); soil with the addition of lime (T2); soil with added Arad 30 days before planting (T3); soil with the addition of Arad on planting (T4); soil with the addition of Arad and liming 30 days before planting (T5); and soil with the addition of Arad and liming on planting (T6), distributed in five replications, totaling 30 experimental units. At 45 days of germination, evaluated the plant height (HP) and number of leaves (NL), culminating with the courts to obtain the shoot fresh matter (SFM) and dry matter (FDM), the other cuts made every 30 days. pH variations responded positively to the treatments using lime to increase the pH to levels close to 6.5. For HP variables, NL, SFM and SDM the highest increases were obtained for treatments under the influence of limestone (T2) and limestone + Arad 30 days before planting (T5). The natural phosphate fertilizer in combination with liming showed significant results for all parameters.

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Section: Soil Chsupporting

confidence: 52%

Yield of Brachiaria in Function of Natural Phosphate Application and Liming in Pará Northeast

Araujo¹,

Rodrigues²,

Galvão³

et al. 2018

JAS

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“…A number of studies have reported applications of first and second degree linear regression models for modeling characteristics of a variety of grass species (FAGUNDES, 2005;COELHO, 2012;SILVA et al, 2012;BONFIM-SILVA et al, 2014;CARMEIS FILHO et al, 2014). Application of these models can be used to assay which dose range optimize the desired characteristics (CABRAL et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Na literatura, é possível verificar aplicações de modelos de regressão linear de primeiro e segundo graus para modelagem de características de diversas espécies de capim (FAGUNDES, 2005;COELHO, 2012;SILVA et al, 2012;BONFIM-SILVA et al, 2014;CARMEIS FILHO et al, 2014). A aplicação desses modelos pode ser utilizada para a verificação de quais intervalos de doses otimizam as características desejadas (CABRAL et al, 2013).…”

Section: Introductionunclassified

Bayesian Modelling of the effects of nitrogen doses on the morphological characteristics of braquiaria grass

Ribeiro

Costa

Beijo

et al. 2018

AGRO@MBIENTE ON-LINE

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The Bayesian approach in regression models has shown good results in parameter estimations, where it can increase accuracy and precision. The objective of the current study was to analyze the application of Bayesian statistics to the modeling yield for leaf dry matter (LM) and stem (SM), in kg ha-1, leaf ratio (LR), crude protein content for leaves (CPL) and stem (CPS) (%) of Brachiaria grass as a function of varying N doses (0; 100; 200 and 300 kg ha-1 yr-1). Simple and two degree polynomial linear regression models were analyzed. Information for a priori distributions was obtained from the literature. A posteriori distribution was generated using a Monte Carlo method via Markov chains. Parameters significance was assyed with HPD (Highest Posteriori Density) with a 95% interval. Model selections was performed using DIC (Deviance Information Criterion); and adjustment quality estimated with means and 95% HPD for Bayesian R2 distribution ranges. The models selected for the variables LM, SM and CPS were linear, while for LR and CPL, they were second level polynomial. The lowest doses that maximize response variables were: LM: 274 ha-1yr-1, SM: 280 ha-1yr-1, LR: 113 ha-1yr-1, CPL: 265 ha-1yr-1, CPS: 289 ha-1yr-1. The Bayesian approach allowed the inclusion of literatureverified a priori information, and the identification of evidence optimization range intervals.

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Phosphorus Sources and Rates Associated with Nitrogen Fertilization in Mombasa Grass Yield

Heinrichs

Monreal

Santos³

et al. 2016

Communications in Soil Science and Plant Analysis

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Nitrogen (N) and phosphorus (P) deficiency is one of the important causes of degradation of cultivated pasture under tropical conditions. The aim of this study was to evaluate phosphate rates and sources, and N rates on the concentration and uptake of N and P, and shoot dry mass (SDM) yield of Megathyrsus maximum grass cv Mombasa in an Ultisol. The trial was carried out in a greenhouse in pots with 4.0 dm −3 of soil. The experiment was arranged in a completely randomized design with four replicates. The 3 × 3 × 3 factorial treatments consisted of phosphorus sources [reactive rock phosphate from Morocco (RPM), reactive rock phosphate from Algeria (RPA) and triple superphosphate (TSP)], three phosphorus rates (0, 150, and 300 mg kg −1), and three N rates (0, 250, and 500 mg kg −1). The SDM and tillering of Mombasa grass were significantly influenced with the TSP, RPM, and RPA application associated with N fertilization. The RPM, RPA, and TSP met the nutritional demands of Mombasa grass. The three P sources showed the same effect on the total N uptake by Mombasa grass. The P use efficiency (PUE) when fertilizer-P sources were added alone by Mombasa grass was <12% of the added P, and PUE decreased as follows: TSP > RPA > RPM. When P and N-fertilizer were added together, the fertilizer-N use efficiency (NUE) was 62%. The reactive phosphate (RPM and RPA) is an efficient P sources for Mombasa grass, but requiring higher rate of application compared to TSP source.

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Características morfológicas e produtivas do capim-marandu adubado com fosfato natural reativo em solo de cerrado.

Cited by 3 publications

References 8 publications

Yield of Brachiaria in Function of Natural Phosphate Application and Liming in Pará Northeast

Yield of Brachiaria in Function of Natural Phosphate Application and Liming in Pará Northeast

Bayesian Modelling of the effects of nitrogen doses on the morphological characteristics of braquiaria grass

Phosphorus Sources and Rates Associated with Nitrogen Fertilization in Mombasa Grass Yield

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