Respostas de braquiária brizantha a doses de potássio

Mattos, Wilson Roberto Soares; Monteiro, Francisco Antônio

doi:10.1590/s0103-90161998000300011

Cited by 15 publications

(12 citation statements)

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“…Similar symptoms were described by Mattos & Monteiro (1998). The appearance of these symptoms was associated with concentrations below 0.5 mmol c dm -3 K in the soil and 8.8 g kg -1 K in shoots.…”

Section: Resultssupporting

confidence: 79%

“…Considering the control (no K) and the 180 mg kg -3 K rate, K concentrations in forage varied from 8.0 to 29.2 g kg -1 in the first sampling and from 7.0 to 23.8 g kg -1 in the second. Mattos & Monteiro (1998) also observed that K fertilization increased concentrations of this nutrient in Marandu grass shoots.…”

Section: Resultsmentioning

confidence: 71%

“…Better tillering and occurrence of largest leaf area in both cuttings were visually observed in the treatments with K application, which could explain the increase of dry matter production shown. In fact, it has been reported that providing K increases tillering (Mattos & Monteiro, 1998) and leaf area (Rodrigues et al, 2006) of forage grass reflected in the production of shoot dry matter.…”

Section: Resultsmentioning

confidence: 99%

“…cv. Marandu grass when cultivated in a K deficient medium, as shown by the experiments of Mattos & Monteiro (1998) and Gama-Rodrigues et al (2002).…”

Section: Introductionmentioning

confidence: 80%

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Effectiveness of fused magnesium potassium phosphate for marandu grass

Júnior

Coutinho

2009

Rev. Bras. Ciênc. Solo

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SUMMARYThe current high price of KCl and great dependence on importation to satisfy the Brazilian demand indicate the need for studies that evaluate the efficiency of other K sources, particularly those based on domestic raw material. For this purpose, a greenhouse experiment was conducted with samples of a sandy clay loam Typic Haplustox, in a completely randomized 4 x 3 x 2 factorial design: four K rates (0, 60, 120, and 180 mg kg -1 ), three sources (potassium chloride (KCl), fused magnesium potassium phosphate (FMPP) and a mixture of 70 % FMPP + 30 % KCl) and two particle sizes (100 and 60 mesh), with three replications. Potassium fertilization resulted in significant increases in shoot dry matter production and in K concentrations, both in soil and plants. The K source and particle size had no significant effect on the evaluated characteristics. Potassium critical levels in the soil and the shoots were 1.53 mmol c dm -3 and 19.1 g kg -1 , respectively.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

“…cv. Marandu grass when cultivated in a K deficient medium, as shown by the experiments of Mattos & Monteiro (1998) and Gama-Rodrigues et al (2002).…”

Section: Introductionmentioning

confidence: 80%

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Effectiveness of fused magnesium potassium phosphate for marandu grass

Júnior

Coutinho

2009

Rev. Bras. Ciênc. Solo

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“…Para que este objetivo fosse alcançado, foram necessárias altas doses de potássio e de magnésio em conjunto. O resultado deste experimento foi próximo ao observado por Mattos & Monteiro (1998), que, utilizando doses de magnésio (2 mmol/L) e de potássio, verificaram que a produção de matéria seca de raízes variou com as doses de potássio atingindo a máxima produção com o uso de potássio na dose de 6,9 mmol/L (269 mg/L).…”

Section: Resultsunclassified

Sistema radicular do capim-tanzânia adubado com potássio e magnésio

Monteiro

Neto

2008

R. Bras. Zootec.

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RESUMO -Um experimento em casa de vegetação foi conduzido no período da primavera de 2004 visando à obtenção de informações relativas aos atributos do sistema radicular de Panicum maximum Jacq. cv. Tanzânia adubado com combinações de potássio e magnésio em solução nutritiva. Utilizou-se o delineamento experimental de blocos ao acaso, com quatro repetições, em esquema fatorial 5 2 incompleto, com 13 combinações de doses de potássio e magnésio, em mmol/L: 0,4K/0,05Mg; 0,4K/1,35Mg; 0,4K/2,65Mg; 3,2K/0,70Mg; 3,2K/2,00Mg; 6,0K/0,05Mg; 6,0K/1,35Mg; 6,0K/2,65Mg; 8,8K/0,70Mg; 8,8K/2,00Mg; 11,6K/0,05Mg; 11,6K/1,35Mg e 11,6K/2,65Mg. Após o segundo corte das plantas, realizou-se a coleta das raízes, utilizandose água corrente e água desionizada com auxílio de peneiras de 0,25 e 1,00 mm. As combinações de doses de potássio e de magnésio foram determinantes para a produção de matéria seca de raízes, o comprimento radicular, a concentração de magnésio nas raízes e as concentrações conjuntas de potássio, magnésio e cálcio. De forma isolada, as doses de potássio alteraram a superfície radicular, o comprimento e a superfície radicular específicos e a concentração de potássio nas raízes. As doses de magnésio, isoladamente, promoveram aumento na superfície radicular e decréscimo na concentração de cálcio nas raízes. As maiores respostas do sistema radicular do capim-tanzânia foram obtidas com o fornecimento de potássio de 6,0 a 8,8 mmol/L e de magnésio de 1,4 a 2,0 mmol/L na solução nutritiva. A participação do potássio foi de 35 a 53% e a do magnésio em torno de 20% na concentração total de potássio, magnésio e cálcio nas raízes.Palavras-chave: comprimento radicular, gramínea forrageira, macronutrientes, solução nutritiva, superfície radicular Tanzania guineagrass root system as related to potassium and magnesium fertilization ABSTRACT -A greenhouse experiment was carried out during the Spring 2004 aiming to evaluate Panicum maximum cv. Tanzania root system as related to the combined supply of K and Mg in nutrient solutions. A randomized block design was used, with four replications, in an incomplete 5 2 factorial experiment with 13 combinations between K and Mg fertilization rates, in mmol/L: 0.4K/0.05Mg; 0.4K/1.35Mg; 0.4K/2.65Mg; 3.2K/0.70Mg; 3.2K/2.00Mg; 6.0K/0.05Mg; 6.0K/1.35Mg; 6.0K/2.65Mg; 8.8K/0.70Mg; 8.8K/2.00Mg; 11.6K/0.05Mg; 11.6K/1.35Mg, and 11.6K/2.65Mg. Roots were collected after the second harvest of the plants, by washing with tap and deionized water and using 0.25 and 1.00 mm screens. Potassium and magnesium rates combinations highly influenced root dry weight, specific root length and surface, and root K concentration. Increasing Mg rates also increased root surface, but decreased calcium concentration in the grass roots. Maximum responses of Tanzania guineagrass roots were found when K was supplied between 6.0 and 8.8 mmol/L and Mg between 1.4 and 2.0 mmol/L. Root K concentration ranged between 35 and 53% and root Mg concentration about 20% to the total concentration of potassium, magnesium and calcium in the gr...

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Marandu Palisadegrass Mineral Nutrition and Production Related to Nitrogen and Potassium Supply

Megda

Monteiro

2014

Journal of Plant Nutrition

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2 Nitrogen (N) and potassium (K) fertilization play a key role in forage crops and can significantly increase yields of 'Marandu' palisadegrass [Brachiaria brizantha (Hochst. exA. Rich.) Stapf.], one of the most important forage crops in Brazil. This study aimed to identify the concentrations of total N and K, nitrate (NO 3 − ), and ammonium (NH 4 + ), chlorophyll meter readings (SPAD), and nitrate reductase activity (At-RNA) required to maximize yield. Plants were grown in quartz substrate and treated with nutrient solutions that ranged from 2 to 33 mmol L −1 for N and 0.5 to 11 mmol L −1 for K. Dry matter production and At-RNA increased with increasing N and K supplies. SPAD readings correlated strongly with N leaf concentration and dry matter production and can be used to assess the N status of this species. The supply of N and K in the fertilization promoted high yield and adequate N and K concentration for plant metabolism.

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Respostas de braquiária brizantha a doses de potássio

Cited by 15 publications

References 2 publications

Effectiveness of fused magnesium potassium phosphate for marandu grass

Effectiveness of fused magnesium potassium phosphate for marandu grass

Sistema radicular do capim-tanzânia adubado com potássio e magnésio

Marandu Palisadegrass Mineral Nutrition and Production Related to Nitrogen and Potassium Supply

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