Kentucky Bluegrass Response to Potassium and Nitrogen Fertilization

Fitzpatrick, Richard J. M.; Guillard, Karl

doi:10.2135/cropsci2004.1721

Cited by 18 publications

(35 citation statements)

References 33 publications

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“…3A). This trend is in agreement with studies that found increasing N uptake with increasing rates of N application (Kopp and Guillard, 2002a;Fitzpatrick and Guillard, 2004). Apparent N recovery ranged from 28 to 40% of applied N, with a maximum corresponding to 4.7 μg cm −2 d −1 AEM soil NO 3 -N (Fig.…”

Section: Nitrogen Uptake Recovery and Use Effi Ciencysupporting

confidence: 92%

“…A decrease in apparent N recovery at higher N fertilizer application rates has been noted in cool-season mixed species turfs (Kopp and Guillard, 2002a;Fitzpatrick and Guillard, 2004) and in sandbased creeping bentgrass (Agrostis stolonifera L.) turfs (Huang and Petrovic, 1994). This effect has been noted also in orchardgrass (Dactylis glomerata L.), tall fescue (Festuca arundinacea Schreb.…”

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confidence: 83%

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Nitrate Leaching from Kentucky Bluegrass Soil Columns Predicted with Anion Exchange Membranes

Mangiafico

Guillard

2007

Soil Science Soc of Amer J

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Ideal nitrogen (N) management for turfgrass supplies sufficient N for high‐quality turf without increasing N leaching losses. A greenhouse study was conducted during two 27‐wk periods to determine if in situ anion exchange membranes (AEMs) could predict nitrate (NO3–N) leaching from a Kentucky bluegrass (Poa pratensis L.) turf grown on intact soil columns. Treatments consisted of 16 rates of N fertilization, from 0 to 98 kg N ha−1 mo−1 Percolate water was collected weekly and analyzed for NO3–N. Mean flow‐weighted NO3–N concentration and cumulative mass in percolate were exponentially related (pseudo‐R2 = 0.995 and 0.994, respectively) to AEM desorbed soil NO3–N, with a percolate concentration below 10 mg NO3–N L−1 corresponding to an AEM soil NO3–N value of 2.9 μg cm−2 d−1 Apparent N recovery by turf ranged from 28 to 40% of applied N, with a maximum corresponding to 4.7 μg cm−2 d−1 AEM soil NO3–N. Turf color, growth, and chlorophyll index increased with increasing AEM soil NO3–N, but these increases occurred at the expense of increases in NO3–N leaching losses. These results suggest that AEMs might serve as a tool for predicting NO3–N leaching losses from turf.

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Section: Nitrogen Uptake Recovery and Use Effi Ciencysupporting

confidence: 92%

mentioning

confidence: 83%

Nitrate Leaching from Kentucky Bluegrass Soil Columns Predicted with Anion Exchange Membranes

Mangiafico

Guillard

2007

Soil Science Soc of Amer J

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“…The responses presumably plateau once physiological requirements for the nutrients are satisfied at the prevailing growth ISRN Agronomy rates. This may well explain why there is no luxury uptake of K by turfgrass [29] and that uptakes of K, Ca, and Mg reflect their physiological requirements rather than their ratios on soil cation exchange sites [27]. Turfgrass clipping nutrient content has been reported to change significantly over the course of a growing season even when nutrient supply is more than adequate.…”

Section: Consequences Of Turfgrass Nutrientmentioning

confidence: 99%

“…Variable nutrient demand at a fixed soil supply may account for difficulties encountered in soil test calibrations and interpretations for turfgrass [23], for reported differences in turfgrass species and cultivar nutrient requirements and nutrient use efficiencies [24][25][26], for lack of relationships between tissue cation and soil exchangeable cation concentrations [27,28], and for lack of K luxury consumption by turfgrass [29].…”

Section: Introductionmentioning

confidence: 99%

Evidence, Regulation, and Consequences of Nitrogen-Driven Nutrient Demand by Turfgrass

et al. 2012

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Nutrient uptake is strongly influenced by plant growth rate. Accelerated growth leads to nutrient levels incapable of sustaining the optimal growth rate, resulting in shoot to root signaling for increased nutrient absorption. The factors controlling nutrient demand in turfgrass and its consequences have not been investigated. The objectives of this research were to verify that turfgrass exhibits the principal characteristics of demand-driven nutrient uptake and to identify the primary factor controlling nutrient demand via regulation of growth rates. Kentucky bluegrass clipping production increased linearly up to annual fertilizer N rates of 600 kg ha −1 and to 1000 kg N ha −1 for creeping bentgrass. At the typical annual N fertilization rates of 150 to 300 kg ha −1 for the two grasses, N supply was the primary determinant of turfgrass growth rate, plant nutrient demand, and nutrient uptake. Nitrogen uptake accounted for over 88% of uptake of all other nutrients. Uptake of P and K were strongly related to tissue N content irrespective of soil test levels. Variations in turfgrass species and cultivar nutrient requirements and nutrient use efficiencies were found to be directly related to differences in growth rates and, by inference, to differences in nutrient demand.

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“…The prediction of yield response to K fertilizer applications based on soil tests for exchangeable K is sometimes of limited accuracy (Pal et al, 2001), particularly for perennial crops such as coffee. The K uptake from nonexchangeable forms by plants has been described (Fitzpatrick & Guillard, 2004) and several mineralogical studies confirmed great differences among soils concerning the K-supply potential.…”

Section: Introductionmentioning

confidence: 97%

Kinetics of K release from soils of Brazilian coffee regions: effect of organic acids

Silva¹,

Marchi

Guilherme

et al. 2008

Rev. Bras. Ciênc. Solo

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SUMMARYKinetic studies on soil potassium release can contribute to a better understanding of K availability to plants. This study was conducted to evaluate K release rates from the whole soil, clay, silt, and sand fractions of B-horizon samples of a basalt-derived Oxisol and a sienite-derived Ultisol, both representative soils from coffee regions of Minas Gerais State, Brazil. Potassium was extracted from each fraction after eight different shaking time periods (0-665 h) with either 0.001 mol L -1 citrate or oxalate at a 1:10 solid:solution ratio. First-order, Elovich, zero-order, and parabolic diffusion equations were used to parameterize the time dependence of K release. For the Oxisol, the first-order equation fitted best to the experimental data of K release, with similar rates for all fractions and independent of the presence of citrate or oxalate in the extractant solution. For all studied Ultisol fractions, in which K release rates increased when extractions were performed with citrate solution, the Elovich model described K release kinetics most adequately. The highest potassium release rate of the Ultisol silt fraction was probably due to the transference of "non-exchangeable" K to the extractant solution, whereas in the Oxisol exchangeable potassium represented the main K source in all studied fractions. Index terms: successive extractions, first order, zero order, parabolic diffusion, Elovich.( RESUMO: CINÉTICA DE LIBERAÇÃO DO POTÁSSIO EM SOLOS DE REGIÕES CAFEEIRAS: EFEITO DE ÁCIDOS ORGÂNICOSEstudos de cinética de liberação de K podem contribuir para avaliação da disponibilidade deste nutriente no solo para as plantas. Este trabalho teve como objetivos investigar a cinética de liberação do potássio nas frações terra fina, areia, silte e argila de dois solos do Estado de Minas Gerais, Brasil, originalmente cultivados com cafeeiro e comparar quatro equações para descrevê-la. As frações foram submetidas a oito extrações sucessivas (0 a 665 h) com citrato e oxalato 1 mmol L -1 , sendo os resultados de K liberado somados e plotados em função do tempo. Foram comparadas as equações de ordem zero, primeira ordem, Elovich e parabólica de difusão, a fim de verificar qual delas melhor descreve a cinética. Na condução do experimento utilizaram-se amostras do horizonte B de um Latossolo Vermelho distroférrico originado de basalto e de um Nitossolo originado de sienito nefelínico. Para cada equação foram calculados o coeficiente de correlação (r) e o erro-padrão da estimativa (EP). A equação de primeira ordem descreveu melhor os resultados do Latossolo e a equação de Elovich se ajustou melhor aos resultados do Nitossolo. As velocidades de liberação do K para o Latossolo foram semelhantes em todas as frações estudadas, não sendo observado efeito dos ácidos orgânicos na velocidade de liberação do K, porque a maior parte do K liberado foi proveniente da forma trocável. No Nitossolo, o citrato acelerou a liberação do K em todas as frações estudadas, e a fração silte foi a que apresentou maior velocidade, pois possivel...

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Kentucky Bluegrass Response to Potassium and Nitrogen Fertilization

Cited by 18 publications

References 33 publications

Nitrate Leaching from Kentucky Bluegrass Soil Columns Predicted with Anion Exchange Membranes

Nitrate Leaching from Kentucky Bluegrass Soil Columns Predicted with Anion Exchange Membranes

Evidence, Regulation, and Consequences of Nitrogen-Driven Nutrient Demand by Turfgrass

Kinetics of K release from soils of Brazilian coffee regions: effect of organic acids

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