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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