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Table 1 Chemical composition of fly ash
IAPRS & SIS, Vol.34, Part 7, *Resource and Environmental Monitoring", Hyderabad, India, 2002
Element Content (ppm) Element Content (ppm)
P 657 B 7.5
K 783 Mo 5.3
Ca 3942 Co 4.8
Mg 1356 Al 3749
S 113 As 28.2.
Zn 14.2 cd 0.62
Cu 7.7 Cr 0.16
Fe 4790 Ni 9.19
Mn 86 Pb 15.4
The grain yield of crops was recorded. Soil and plant
samples were also collected and processed for their
chemical analysis. Soil samples were extracted with AB-
DTPA (Soltanpour, 1985) and grain samples were
digested in HNO;-H,O; mixture and analysed with the
RESULTS AND DISCUSSION
Crop Yield
Seed yield of sunflower increased significantly with
increasing rates of fly ash application (Table2). A
significant response of 2.5 q/ha in seed yield of
help of Inductively Coupled Argon Plasma-Atomic
Emission Spectrophotometer. Soil pH, electrical
conductivity, organic carbon and bulk density were
determined by using standard methods.
sunflower over control was recorded when fly ash was
applied @ 20 t/ha.
Table 2 Effect of fly ash on grain yield (q/ha)of sunflower and maize
Rate of fly ash (t/ha) Sunflower Maize
0 17.5 25.0
10 19.1 25.2
20 20.0 25.6
40 20.1 26.0
CD (5%) 1.5 NS
This may be due to high content of S in fly ash (Tablel)
because sunflower being an oilseed crop has high S
requirement. However, there was not much difference
among the treatments on the yield of succeeding maize
crop. Malewar et al. (1999) also observed a significant
response of fly ash application (10 t/ha) to sunflower
and cotton. In another experiment under wheat —maize
rotation the grain yield of wheat increased significantly
by 2.8 q/ha (Table3) when fly ash was applied @ 8 t/ha
and like that of sunflower —maize rotation the grain yield
of subsequent maize crop was also not significantly
effected by fly ash application to wheat crop.
Table 3 Effect of fly ash on grain yield (q/ha) of wheat and maize
Rate of fly ash (t/ha) Wheat Maize
0 48.0 20.0
4 49.5 20.2
8 50.8 19.7
12 50:2 19.7
CD (5%) 1:9
NS