Group Title: TropSoils field research brief ;, 21
Title: Mungbean and cowpea response to application of K at three lime rates
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 Material Information
Title: Mungbean and cowpea response to application of K at three lime rates
Series Title: TropSoils field research brief ;, 21
Physical Description: 2, 1 leaves : ill. ; 28 cm.
Language: English
Creator: Gill, Dan.
Kamprath, E. J.
Lembaga Penelitian Tanah.
Soil Management Collaborative Research Support Program.
Publisher: Soil Management Collaborative Research Support Program, North Carolina State University,
Publication Date: 1985
Subject: Mung bean -- Fertilizers -- Indonesia.
Cowpea -- Fertilizers -- Indonesia.
Soil management -- Indonesia.
Spatial Coverage: Indonesia.
General Note: Caption title.
General Note: "November, 1985."
General Note: At head of title: TropSoils Indonesia - Center for Soil Research.
 Record Information
Bibliographic ID: UF00080598
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 156945273

Full Text

Field Research Brief No. 21
November, 1985

TITLE: Mungbean and cowpea response to application of K at three
lime rates


RESEARCHERS: D.W. Gill and E.J. Kamprath

OBJECTIVES: 1. To determine the response of cowpeas (Vigna
unguiculatus) and mungbeans (Vigna radiata)
grown at 3 lime rates to K applied to the
previous peanut crop.
2. To compare performance of the two crops when
grown with only residual fertilizers during
the dry season (none applied to these 2 crops)

SOIL: Clayey, kaolinitic, isohyperthermic, typic dystropept,
cleared about 8 years ago by bulldozers, cropped briefly and
abandoned. FCC Cak.

EXPERIMENTAL DESIGN: Split-split-plot with 4 replications: main
plots were lime rate 0.375, 2.25 and 6.5 t/ha (seeking to
establish 70, 40 and 0 % Al), subplots were K rates applied to
the previous peanut crop 0, 20, 40, 80, 120 and 240 kg K/ha,
and sub-subplots were mungbeans or cowpeas. Harvest for each
sub-subplots was 7 m2.

CROP HISTORY: Local indeterminate varieties of both cowpea and
mungbean were planted 26 May, 1985 with no fertilizer inputs
other than those applied to -the previous peanut crop. Thus, if
sufficient rainfall occurred during this period of dry season, a
crop could be harvested, but if insufficient rainfall to produce
a crop occurred, then losses would only include seed and labor
for planting. Two harvests were required for the mungbeans (on 7
and 11 August), and three for the cowpeas (on 11, 19, and 24

RESULTS: Both crops germinated rapidly and grew well for the
first 2-3 weeks with sufficient soil moisture, except for the
mungbeans at the low lime rate which grew very slowly. A dry
period of approximately 2 weeks followed, slowing mungbean growth
considerably, while cowpeas had evidently established their root
systems sufficiently to avoid the effects of the drought. During
flowering and up until harvest, rainfall was adequate for good
crop growth.
Mungbean yields were generally quite poor (Figure 1),
especially at the low lime rate. Other work in Sitiung (Wade et
al., 1984) has shown mungbeans to be very sensitive to soil Al
(perhaps more so than soybeans) and to require high Ca + Mg
levels for good production. This experiment had a highly signi-
ficant mungbean response to lime, but it also showed a highly

Significant response to residual K. There also was a significant
lime*K interaction. Figure 1 shows that even though mungbean
yields were low, planteau yields were obtained with approximately
40 kg K/ha at the low lime rate and 80 kg K/ha at the medium lime
rate. At the high lime rate, yields increased rapidly up to the
80 kg K/ha rate and apparently were still increasing with 240 kg
Cowpeas, on the other hand, did not respond to lime (Figure
1). Yields at the low lime and 0 K treatments were almost as
high as those of mungbeans with high lime and K, thus
demonstrating their tolerance to high Al and low soil K relative
to mungbeans. Response to K was dramatic up to 80 kg K/ha,
however, with a yield plateau of 1500 kg beans/ha.
Initial soil data from the few samples analyzed for K to date
seem to indicate that most applied K is rapidly leached out of
the profile during the growing season of the crop to which it was
applied. However, this experiment clearly indicates that the
effects of applied K are evident in the succeeding crop as well.
It also seems to illustrate how much better adapted to the soils
of this region cowpeas are than mungbeans, and current work is
being conducted, along with IITA, seeking to identify superior
cowpea genotypic adaptability to the Sitiung area.

Literature cited

1. Wade, M.K., C.P.J. Colfer, J.R. Thompson and D. Santoso, 1984,
Soil constraints of a transmigration development area in West
Sumatera, Indonesia. Agron. Abst.P.45.


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