Residual and maintenance rates for lime

Material Information

Residual and maintenance rates for lime
Series Title:
TropSoils field research brief ;, 15
Wade, M. K. (Michael Karl)
Kamprath, E. J.
Djoko Santoso.
Soil Management Collaborative Research Support Program.
Place of Publication:
Raleigh, NC
Soil Management Collaborative Research Support Program, North Carolina State University,
Publication Date:
Physical Description:
2, 1 leaves : ill. ; 28 cm.


Subjects / Keywords:
Liming of soils -- Indonesia.
Soil management -- Indonesia.
Soybeans ( jstor )
Soil science ( jstor )
Tillage ( jstor )
Spatial Coverage:
Indonesia. -- Sumatra


General Note:
Caption title.
General Note:
"June, 1985."
General Note:
At head of title: TropSoils-Indonesia.

Record Information

Source Institution:
University of Florida
Holding Location:
University of Florida
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Resource Identifier:
156913094 ( OCLC )


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Full Text
Field Research Brief No. 15 PLLITTAN
TITLE: Residual and Maintenance Rates for Lime
RESEARQHERS: Mike Wade, E. J. Kamprath, and Djoko Santoso
1. To determine the critical level of soil acidity
parameter(s) for optimum production of upland rice and soybeans,
2. To determine a method of predicting lime rates necessary achieve a specified level of soil acidity,
3. To determine the annual lime application rate required to maintain a specified level of soil acidity,
4. To monitor the residual effects of various rates of lime applications on a rotation of rice and soybeans.
SOIL: Typic haplorthox, Ceak; bulldozer cleared in 1978, annual cropping of upland rice without lime or fertilizer input.
A. Initial Lime Rates B. Management
1. 0 tons/ha 1. residual
2. 0.5 (3/8 X exch. Al) 2. annual maintenance
3. 1 3/4 applied on a per4. 2 1.5 plot basis aimed
5 4 3.0 at 60, 40, 20, 10
and 0% Al sat, respectively.
Lime source is Ca(OH)2.
CROP: Soybeans (second season), cv. Orba, planted 20 X 40cm X 3 seeds/hole, in February and harvested in May, 1985. Pesticides were: carbofuran 38 applied with seed at planting and weekly sprays of endosulfan (1.5 1 a.i./ha) beginning after flowering and continuing until near physiological maturity. Base fertilizers.included 20 kg P, 50 kg K, 16 kg Mg and 23 kg S/ha. Niftal inoculum was. seed applied.
RESULTS: The soybean crop grew well despite the relatively dry weather that caused several short, but serious water stress periods for the crop. Insect damage was minimum and the welllimed plots yielded >1.5 t/ha. Figure 1 shows the yield response of the beans as effected by lime rates. The residual plots, i.e. those that had only the indicated rates at the initiation of the experiment in Sept, 1983, show a linear response to the lime rates. The maintenance plots, those that get an annual maintenance application of lime, indicate a steeper response with maximum yield occurring near the 2 t/ha "maintained" treatment.

Acid (Al+H) saturation proved, as last year, to be a good
indicator of soybean response. Figure 2 shows the two years' data combined for a regression of acid saturation on soybean yield. It is remarkable how similar the data for the two years fit together. However, again like last year, no plateau or critical level is defined as the regression is linear- from 0%. This is somewhat different from other lime trials on soybeansi irn TROPSOILS (see FRB #10) which indicate a linear plateau relationship with the plateau intercept occuring just below 30% acid sat4ration. These are with the same variety and grown more or less at the same time, but of course at a different location. This trial is on an oxisol, and the soil is a brighter red and appears more highly weathered than the soil of the other trials. Also the lime used here is burned lime' (Ca(OH)2) whereas the others use ground limestone (CaCO3). Whether possible mineralogical differences and/or lime source differences account for this discrepency in soybean tolerance is unknown at this time. One goal of our research is indeed to find a method of predicting lime requirements across a wide range of- conditions, so now we have the challenge of trying to blend and unify this seemingly conflicting data.

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