Effects of liming on soil magnesium on some soils in New Zealand

Edmeades, D. C.; Wheeler, D. M.; Crouchley, G.

doi:10.1080/00103628509367640

Cited by 19 publications

(6 citation statements)

References 9 publications

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“…Negative magnesium slopes have also been observed on some soils in New Table 3. Coefficients of determination (R') and slopes ( b = cmol(+) k g -l l p~ unit) for the linear relationship between exchangeable cations and soil pH on 11 soils Zealand, where it was suggested that the major mechanism by which lime reduces exchangeable Mg was through displacement of exchangeable Mg into solution by the added Ca in lime, and subsequent leaching (Edmeades et al 1985). Only one soil had a significant correlation between pH and potassium.…”

Section: Observed Relationships Between Ph and Exchangeable Cations Imentioning

confidence: 99%

Changes in effective cation exchange capacity and exchangeable aluminum with soil pH in lime-amended field soils

Hochman¹,

Edmeades²,

White³

1992

Soil Res.

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Eleven acidic soils from northern N.S.W., having a wide range of values for ECEC, A1 and soil organic carbon (%C), were treated in the field with five rates of lime. The relationships between soil pH and the effective cation exchange capacity (ECEC), and between pH and exchangeable aluminium (Al), were investigated for the top 10 cm of these soils.Increases in the total exchangeable cations (TEC) calculated as ECEC-Al, were shown to be madelup almost entirely by increases in exchangeable calcium. There were no consistent changes in the amount of exchangeable magnesium, potassium or sodium due to liming these acidic soils.Formulae used to predict changes in A1 and ECEC with pH in the 'Lime-it' model were tested and modified on the 11 soils from northern N.S.W. A strong linear relationship was observed in each soil between A1 and pH (transformed to hydrogen ion concentrationxl~~). The slope of this relationship (SAL,) can be predicted from the pH and A1 values of unlimed soils.Strong linear relationships were also observed between pH and TEC, for each of the 11 soils. The SL, (the slope of the linear relationship TEC/pH for any soil 's') was shown by multiple regression analysis to be a function of TECi/pHi (where TECi is the sum of exchangeable cations of unlimed soil 's'; and pHi is the pH value of unlimed soil 's'), %C of the unlimed soil, and SAL,.By using the measured values of pH, ECEC, A1 and %C of unlimed soils, the values of Al, and TEB can be predicted for any pH value that may be measured (or predicted) after liming.The predictive relationships developed on N.S.W. soils were tested against independent data from New Zealand. The results confirmed the AllpH predictions (R2 = 0-955), while the TEC/pH predictions were less well matched ( R~ = 0.62) possibly due to unusual clay mineralogy or organic matter fractions of 3 of the 18 soils tested.

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Section: Observed Relationships Between Ph and Exchangeable Cations Imentioning

confidence: 99%

Changes in effective cation exchange capacity and exchangeable aluminum with soil pH in lime-amended field soils

Hochman¹,

Edmeades²,

White³

1992

Soil Res.

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“…New Zealand soils have a higher affinity for Ca than for Mg, K, and Na (Edmeades & Judd 1980), and hence high inputs of Ca displace the other cations from the exchange sites. This is why excessive Ca additions can increase the leaching losses of Mg, K, and Na (Edmeades et al 1985b). This increased leaching is likely to be one of the reasons why soil Mg levels in New Zealand pastoral soils are decreasing (Wheeler & Roberts 1997).…”

Section: Calcium Balance In Pasturesmentioning

confidence: 99%

The calcium requirements of pastures in New Zealand: A review

Edmeades¹,

Perrott²

2004

New Zealand Journal of Agricultural Research

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“…At the low rainfall site, a trial was also conducted under grazing. Previously reported results from these trials include soil test results for the grazing trial (Wheeler & Edmeades 1997), yield results from all treatments on the mowing trial on the Matapiro soil (Edmeades et al 1991), and the effect of lime on soil solution chemistry (Edmeades et al 1985a) and Mg availability (Edmeades et al 1985b) for all trials.…”

Section: Introductionmentioning

confidence: 99%

Effect of lime on yield, N fixation, and plant N uptake from the soil by pasture on 3 contrasting trials in New Zealand

Wheeler¹,

Edmeades²,

Morton³

1997

New Zealand Journal of Agricultural Research

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The amount of plant nitrogen (N) uptake from the soil and fixed N in the herbage of clover species were measured using a 15 N dilution technique on mowing trials at 3 lime rates (0, 5000, and 10 000 kg/ha) at a low rainfall site (Matapiro soil) near Hastings over 5 years and at a high rainfall site (Mangatea soil) near Te Kuiti over 4 years. At the low rainfall site, measurements were also made over 5 years on a grazing trial at 2 lime rates (0, 7500 kg/ha). The dominant clover species was subterranean clover on the low rainfall site and white clover on the high rainfall site. Overall, the average proportion of clover N that was fixed from the atmosphere (PNfix) was about 0.8 of total N in clover. The average annual amount of fixed N in clover herbage was 35 kg/ha in the grazing trial on the Matapiro soil, 65 kg/ha on the mowing trial and 105 kg/ha in the trial on the Mangatea soil. Over all harvests and lime treatments, the amount of N fixed could be estimated as 0.04 x clover yield (kg DM/ha) on the high rainfall site and 0.046 x clover yield on the low rainfall site. The average annual amount of plant N uptake from the soil by grass, clover, and A96070Received 16 September 1996; accepted 18 February 1997 weeds was 150 kg/ha in the grazing trial and 160 kg/ha in the mowing trial on the Matapiro soil, and 240 kg/ha in the trial on the Mangatea soil. In the first 3 years, lime increased grass N uptake by an average of 24 kg/ha/yr over all trials. In the mowing trials, grass N uptake increased during the first 3 years by an average of 16 kg/ha when 5000 kg/ha of lime was applied, and by 33 kg/ha when 10 000 kg/ha was applied. This increase was attributed to an increase in net N mineralisation. However, the increase in net N mineralisation due to liming was a short term effect as lime had no significant effect on grass N uptake after 3 years.

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Effects of liming on soil magnesium on some soils in New Zealand

Cited by 19 publications

References 9 publications

Changes in effective cation exchange capacity and exchangeable aluminum with soil pH in lime-amended field soils

Changes in effective cation exchange capacity and exchangeable aluminum with soil pH in lime-amended field soils

The calcium requirements of pastures in New Zealand: A review

Effect of lime on yield, N fixation, and plant N uptake from the soil by pasture on 3 contrasting trials in New Zealand

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