Eficiência nutricional e aproveitamento do nitrogênio pelo capim-marandu de pastagem em estágio moderado de degradação sob doses e fontes de nitrogênio

Silva, Douglas Ramos Guelfi; Costa, Kátia Aparecida de Pinho; Faquin, Valdemar; Oliveira, Itamar Pereira de; Souza, Milena Rízzia Ferreira de; Souza, Marcos André Silva

doi:10.1590/s1413-70542011000200003

Cited by 15 publications

(16 citation statements)

References 10 publications

(11 reference statements)

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“…De acordo com Silva et al (2011), a maior produção de massa seca de folhas com a utilização do sulfato ano -1 ocorre devido às menores perdas de N, enquanto que, com a utilização da uréia essas perdas de amônia para a atmosfera são mais acentuadas, promovendo menor eficiência da adubação nitrogenada e diminuindo a resposta da planta em produção por unidade de N aplicado.…”

Section: Resultsunclassified

Doses e fontes de nitrogênio na recuperação das características estruturais e produtivas do capim-marandu

Silva¹,

Costa²,

Faquin³

et al. 2013

Rev. Ciênc. Agron.

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Doses e fontes de nitrogênio na recuperação das características estruturais e produtivas do capim-marandu 1Rates and sources of nitrogen in the recovery of the structural and productive characteristics of marandu grass ABSTRACT -To replenish soil fertility is one of the ways of recovering the productive capacity of degraded pasture. Nitrogen fertilisation is fundamental to increasing forage production, especially when it comes to the recovery of pasture. With this in mind, the objective of this work was to evaluate the structural characteristics and dry matter (DM) accumulation of the leaf blades and sheathed stems of marandu-grass pasture at a moderate stage of degradation, for different dosages and sources of nitrogen, during a three-year period. The experiment was carried out from July, 2003 to March, 2006 at the Model Farm of the Goiás State University (UEG), over an area of 882 m 2 with plots of 20 m 2 and usable area of 6 m 2 . The experimental design was of randomized blocks with three replications. The treatments in the plots were characterized by a 2 x 4 factorial, being two nitrogen sources (ammonium sulphate and urea) and four nitrogen dosages (0; 100; 200 and 300 kg ha -1 yr -1). For each sub-plot, treatments were represented by the years (2004, 2005 and 2006), as relating to the time of the recovery of the pasture. Nitrogen fertilization was divided into three applications, following each harvesting of the grass for forage evaluation. The results showed that nitrogen fertilisation influenced the structural characteristics and dry matter accumulation of marandu grass, and hence its recovery. The dosage of 300 kg ha -1 yr -1 of ammonium sulphate resulted in greater values for plant height, tiller density and leaf-blade dry matter.

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Section: Resultsunclassified

Doses e fontes de nitrogênio na recuperação das características estruturais e produtivas do capim-marandu

Silva¹,

Costa²,

Faquin³

et al. 2013

Rev. Ciênc. Agron.

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“…Different from the observed in the silvopastoral system, Silva et al (2011), studied Marandu grass without the effect of shading, and they verified an increase in the nitrogen utilization efficiency with the application of nitrogen fertilizer in the soil. The grass also presented greater capacity to accumulate and absorb N, which favored the maximum deposition in tissue with higher N doses.…”

Section: Resultsmentioning

confidence: 63%

“…In studies conducted by Silva et al (2011), the agronomic and physiological efficiency presented reduction with N doses higher than 100 kg ha -1 year -1 applied to the soil. Even with increased forage production in larger doses, the plant has already reached its point of nitrogen saturation, since the increment of the dry mass of forage per unit of nitrogen applied and absorbed by the plant is reduced.…”

Section: Resultsmentioning

confidence: 98%

Productive efficiency of mombasa grass in silvopastoral system under pasture deferment and nitrogen fertilizer

Júnior

Santos

Rodrigues

et al. 2017

SCA

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This study aimed to evaluate the efficiency of Mombasa grass in a silvopastoral system and submitted to different nitrogen fertilization rates and pasture management strategies. Treatments consisted of four nitrogen fertilizer doses (0.0, 125.0, 187.5, and 250.0 kg N ha -1 year -1 ) and three cutting heights (70, 90, and 105 cm). Plant agronomic and physiologic efficiencies, as well as nitrogen use and accumulation by plants, forage production, and increments of forage production, were verified for the application of nitrogen fertilizer. Nitrogen fertilization was only efficient for grasses cut at 105 cm, where 75% of the applied nitrogen at a dose of 125 kg ha -1 year -1 was recovered. Yet the grasses cut at 70 and 90 cm presented low results for nitrogen fertilization, showing plants with low physiological and agronomic efficiencies. For Mombasa grass in a silvopastoral system, nitrogen fertilization is more efficient when applied at lower doses and for plants cut at higher heights. Key words: Megathyrsus maximus. Agroforestry systems. Pre-grazing height. Post-grazing height. ResumoObjetivo de avaliar a eficiência do capim Mombaça manejado em sistemas silvipastoril submetido adubação nitrogenada e estratégias de manejo de corte do pasto. Avaliou-se o capim Mombaça manejado em sistema silvipastoril, com quatro doses de nitrogênio (0, 125; 187,5 e 250 kg ha -1 ano -1 ) e três alturas de corte do capim (70, 90 e 105 cm). Verificando a eficiência da planta quanto a utilização do nitrogênio, eficiência agronômica, eficiência fisiológica, acúmulo de nitrogênio na planta, produção de forragem e o incremento de produção de massa de forragem com aplicação do adubo nitrogenado. A adubação nitrogenada foi eficiente somente para o capim manejado a 105 cm de altura de corte, onde foi possível obter nas doses de 125 kg ha -1 ano -1 recuperação de 75% do nitrogênio aplicado. Já o capim manejado a 70 e 90 cm apresentou baixo resultado com uso de adubação nitrogenada, com baixa eficiência fisiológica e agronômica. O capim Mombaça em sistema silvipastoril com uso de fertilizante nitrogenado é mais eficiente em baixos níveis de nitrogênio aplicado e nas maiores alturas de corte do pasto. Palavras-chave: Megathyrsus maximus. Sistemas Agroflorestais. Altura pré-pastejo. Altura pós-pastejo.

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“…In processing, the potassium is separated from ore and concentrated on wastes. A more detailed characterization of these materials, including X-ray diffractometry, photomicrography, and effects over soil chemical attributes are available at Silva et al (2012). The total amount of rocks, in t ha -1 , corresponding to doses of 200, 400 and 600 kg ha -1 K 2 O equivalent, were respectively: Breccia 13.…”

Section: Methodsmentioning

confidence: 99%

Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

Silva¹,

Spehar²,

Marchi³

et al. 2014

Afr. J. Agric. Res.

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The increasing world population has led into big food and raw material demand, with high pressure on agriculture. In Brazil, potassium fertilizers are mostly imported rising interest on rocks and mining rejects as alternative sources. The objective of this work was to evaluate the effect of crushed rocks over mineral nutrition, yield and efficiency of potash fertilization in rice. The experiment was carried out under greenhouse conditions in pots with 3.7 kg of Oxisol soil samples. The experimental design was completely randomized, in a factorial layout 4 × 6, comprising six crushed rocks used as alternative multinutrient fertilizer (breccia, biotite schist, ultramafic, Chapada byproduct, mining byproduct and phlogopite), and four doses based on potassium (0, 200, 400, 600 kg K 2 O ha -1 ), with four replications. The concentration and accumulation of potassium, copper, zinc and nickel in rice shoot dry mass were determined. These data were used to evaluate the efficiency index of K-source rocks on fertilization. It was shown that crushed rocks promote alterations in mineral nutrition, grain yield and potassium use efficiency, remarking their potential to be used as alternative fertilizer in rice cropping systems.

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Eficiência nutricional e aproveitamento do nitrogênio pelo capim-marandu de pastagem em estágio moderado de degradação sob doses e fontes de nitrogênio

Cited by 15 publications

References 10 publications

Doses e fontes de nitrogênio na recuperação das características estruturais e produtivas do capim-marandu

Doses e fontes de nitrogênio na recuperação das características estruturais e produtivas do capim-marandu

Productive efficiency of mombasa grass in silvopastoral system under pasture deferment and nitrogen fertilizer

Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

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