EFFECT OF LIMING, N AND P FERTILISATION OF A LIXISOL ON THE GROWTH OF SELECTED SOYBEAN CULTIVARS UNDER SUB-HUMID TROPICAL CONDITIONS IN ZIMBABWE - Soybean and Wheat Crops: Growth, Fertilization, and Yield - page 92

Table 5. Effect of liming, N and P fertilisation of nodule dry matter yield of a selected
soybean cultivar
Nodule dry matter yield (g 10 plants -1 nodules)

2002/2003 2003/2004

P application rate
(kg ha -1 )

-Lime +Lime -Lime +Lime

-N +N -N +N -N +N -N +N

0 0.060 0.054 0.111 0.046 0.012 0 0.016 0.001

7.5 0.064 0.032 0.082 0.066 0.020 0.001 0.044 0.001

15 0.037 0.052 0.095 0.051 0.021 0.001 0.057 0

22.5 0.097 0.045 0.080 0.047 0.034 0.001 0.041 0

LSD
(P<0.05)

Lime
N
P
Lime x N
N x P
Lime x N x P

0.016
0.014
NS
NS
NS
NS

0.008
0.005
0.008
NS
0.011
NS

N rates: -N = 0 kg N ha -1 ; +N = 30 kg N ha -1 .
NS - Not significant.

3.4. Effect of Soil Acidity of Grain and Stover Yield of Selected Cultivars

In the first year, Solitaire yielded significantly higher than other cultivars in unlimed soil
but in the second season yields were similar (Figure 1). Liming significantly increased grain
yield in first (P=0.046) and second (P=0.023) seasons. Lime x cultivar interaction was
significant with liming responses ranging from 8.1% (Soliatire) to 19.1% (Safari) in the first
season, and 5.9% (Storm) to 27.6% (Magoye) in the second season.
In both seasons, stover yield was significantly different across cultivars in acid soil
(Figure 1). Safari produced the highest stover yield in acid (unlimed) soil in the first season,
and in the second season stover yield for Magoye was significantly lower compared to the
other three cultivars which were similar. Liming significantly increased yield in both years
(P=0.008, 2002/03; P=0.036, 2003/04) and lime x cultivar interaction was not significant.

3.5. Effect of Liming, N and P Fertilization on Soybean Grain and Stover P
Uptake

Liming, N and P rate had no effect on P uptake by grain in the first season (p<0.05). In
the second season, liming increased by uptake of P by grain (P<0.001) by an overall average
of 22%. Total P uptake increased with increasing P by an overall average of 19%, 23 % and
26% at 7.5, 15 and 22.5 kg P ha -1 respectively. Treatments in which lime and P fertilizer were
applied together had higher grain P uptake compared to treatments where P fertilizer was