Probabilidade de resposta da cana-de-açúcar à adubação potássica em razão da relação K+ (Ca2++Mg2+ )-0,5 do solo

Reis, Roberto dos Anjos

doi:10.1590/s0100-204x2001000900011

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Most studies involving potassium rates in sugarcane have been carried out under different soil and climate conditions, as well as using different varieties (Reis Junior, 2001;Lana et al, 2004;Rossetto et al, 2004Rossetto et al, , 2010bOtto et al, 2010;Flores et al, 2014Flores et al, , 2020Pancelli et al, 2015). However, there are few studies on sandy soils planted with more recent varieties, particularly regarding application methods of potassium for sugarcane under green-cane harvesting, a condition that can affect crop responses to potassium fertilization management (Luz et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Potassium application for sugarcane in a sandy loam Oxisol of the Brazilian Cerrado

Rodrigues

Carneiro

et al. 2021

Pesq. agropec. bras.

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The objective of this work was to evaluate rates and methods of potassium application for plant cane (Saccharum spp.) grown in a dystrophic Typic Haplustox with a sandy loam texture in the Brazilian Cerrado. The experiment was carried out in the municipality of Aporé, in the state of Goiás, using the RB92579 sugarcane variety. The experimental design was randomized complete blocks, with three replicates, in a 5x3 factorial arrangement, with five potassium rates (0, 60, 110, 160, and 200 kg ha-1 K2O as potassium chloride) and three application methods (100% at the bottom of the planting furrow and covered with soil, 100% side-dressed on the sugarcane rows 60 days after planting, and 50% in the planting furrow and 50% side-dressed). The amount of potassium in the stalks in the control treatment was greater than that of the potassium stock extractable by Mehlich-1 in the 0-60 cm soil layer. Stalk and sugar yields increase linearly with potassium rates, approximately 20% with 200 kg ha-1 K2O compared with the control treatment (without potassium). Potassium content in stalks also increases with potassium rates. There is no significant effect of the potassium application methods on stalk and sugar yields and on cane quality variables.

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Section: Introductionmentioning

confidence: 99%

Potassium application for sugarcane in a sandy loam Oxisol of the Brazilian Cerrado

Rodrigues

Carneiro

et al. 2021

Pesq. agropec. bras.

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“…Lana et al (2004) demonstraram que o parcelamento de metade da dose de K 6 meses após o plantio, ou 2/3 da dose após os 6 meses, promoveu ganhos da ordem de 13 t ha -1 para a variedade RB72454 cultivada no município de Igarapava-SP. Outro critério possível para a adubação potássica leva em conta a concentração de cálcio (Ca) e magnésio (Mg) no solo, como demonstrado por Reis Junior (2001). Este autor analisou os resultados de 106 experimentos e verificou que a relação K(Ca + Mg) -0,5 pode ser utilizada como critério para orientar a adubação potássica.…”

Section: Potássio E a Cana-de-açúcarunclassified

“…Quanto maior a relação, menor a probabilidade de resposta. Nesse sentido, o autor indicou os índices 0,254 como baixo, de 0,254 a 0,335 como média e maior que 0,335 como alto (REIS JUNIOR, 2001).…”

Section: Potássio E a Cana-de-açúcarunclassified

Eficiência de uso de potássio e de água em genótipos de cana-de-açúcar

Zanchim¹

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Sugarcane has marked genotypic variation related to nutrient use efficiency, which in turn the approach of this subject in scientific research prioritizes studies related to nitrogen (N) and phosphorus (P), but due to the essentiality of potassium (K) as a nutrient, and its importance in the Brazilian economy, researches related to K use efficiency can help the development of efficient genotypes, which, because the K water relation functions in plants may have a direct relation in the water use efficiency. In the first experiment were evaluate the changes in morphological and physiological sugarcane genotypes (SP90-3414 and SP83-2847) promotes by the reduction of K concentration, the parameters were quantifying the leaf area; root system morphology (total length and total surface area of roots); biomass of roots and shoots; K concentration and accumulation in plant tissues; total soluble and reduced sugars percentage; activity of the enzyme nitrate reductase; leaf water potential and gas exchange parameters. The K concentrations used in the nutrient solution were 1 and 6 mmol L-1 , distributed as experimental design of randomized complete block design, using a factorial 2 x 2 (two K rates x two sugarcane genotypes), with five replications. The rates caused differences in the K uptake efficiency by cultivars, triggering positive changes in their accumulation in plant tissues and the morphological and physiological parameters. The second experiment were to evaluated the influence of water deficit on morphological and physiological parameters of the plants and to study the behavior of these parameters according to the increase of the available K concentration. The analysis aimed to evaluate the water relations in plants and the water status interference in the gas exchange process, as well as relating the parameters of the K use efficiency with the efficiency of water use. The experiment was conducted in pots containing 8 dm 3 of soil, the experiment was also conducted in a randomized block design, using a factorial 2 x 2 x 2 (two K rates x two water regimes x two sugarcane cultivars), and the K rates used was 1 and 6 mmol c dm-3 of soil, water regimes was 70% and 20% of field capacity and the genotypes were the same as the first experiment. The results shows improvements in water and gas exchange parameters of cultivars developed in high-level K and subjected to water deficit, showing a positive relationship between potassium fertilization and sugarcane plant resistance to adverse water condition. On average, the highest water use efficiency (WUE) of SP83-2847 tolerant genotype may result from potassium use ufficiency (KUtE).

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Potassium nutrition in sugar cane ratoons cultured in red latosol with a conservationist system

Santos

Prado

Almeida

et al. 2015

Journal of Plant Nutrition

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The aim of this study was to evaluate the effect of potassium addition to the soil in first and second ratoon sugarcane cultures in a conservationist system. The experiment was conducted at the State of Sao Paulo, Brazil, in a Acriferric Red Latosol cultured with a IAC SP 93-3046 cane sugar variety after plant-cane cutting. The experiment involved five potassium treatments and four repetitions in randomized block design. The potassium (K) dosages were 27, 54, 108, and 162 kg K ha -1 , and a treatment without potassium. Six months after the start of the experiment, soil samples collected at 0-20 and 20-40 cm in depth were analyzed for K content. Four months after sprouting, plants were evaluated, by tiller numbers, height, diameter, technological analysis of stalks, and nutritional status. In the first ratoon, potassium fertilization increased stalk Downloaded by [University of Otago] at 10:46 17 July 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 diameters, increased potassium accumulation in the aerial parts, and increased stalk production.In the second ratoon, there was a water deficiency, and soil application of potassium did not influence plant growth, nutritional status, or production parameters. Application of potassium in cane sugar ratoons did not contribute to stalk technological quality.

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Probabilidade de resposta da cana-de-açúcar à adubação potássica em razão da relação K+ (Ca2++Mg2+ )-0,5 do solo

Cited by 6 publications

References 3 publications

Potassium application for sugarcane in a sandy loam Oxisol of the Brazilian Cerrado

Potassium application for sugarcane in a sandy loam Oxisol of the Brazilian Cerrado

Eficiência de uso de potássio e de água em genótipos de cana-de-açúcar

Potassium nutrition in sugar cane ratoons cultured in red latosol with a conservationist system

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