Journal of Applied Science Studies - Ozean Publications

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Ozean Journal of Applied Sciences 1(1), 2008 Extractable P (ppm) 20 15 10 5 0 Cont. TSP TSP+S TSP+S10 TSP+S20 10 20 30 40 50 60 Extractable P (ppm) 20 15 10 5 0 Cont. SSP SSP+S SSP+S10 SSP+S20 10 20 30 40 50 60 Incubation time (days) Extractable P (ppm) 20 15 10 5 Cont. RP RP+S RP+S10 RP+S20 0 10 20 30 40 50 60 . Figure 1. Effect of prepared phosphate mixture on extractable phosphorus during periods incubations. Field experiment Soil pH after harvesting Fig. (2) show the soil pH measured after harvesting of maize plants. Application of rock phosphate resulted in a slight decreasing in soil pH. The effect of RP on soil pH varying from no effect to a slight increase. On the other hand, application of SSP and TSP decreased soil pH from 8.20 to 7.81 and 7.85, respectively. Also, application of rock phosphate with sulfur element decreased soil pH from 8.2 to 7.83, 7.80 and 7.75 with RP + S, RP + S10 and RP + S20, respectively. This can be attributed to the acidifying effect of the 109
Ozean Journal of Applied Sciences 1(1), 2008 sulfur element component of the product and its effect on P availability in soil. Rajan et al., (1997) found that application of RP + S to alluvial soil gave a higher extractable P than RP alone. Addition of SSP + S markedly decreased in soil pH compared to RP + S or TSP + S . The lowest level of soil pH (7.6) was recorded in the soil treated with SSP + S20. 8.1 RP SSP TSP 8 7.9 Soil pH 7.8 7.7 7.6 7.5 7.4 Cont. S0 S S10 S20 Figure 2. Changes in soil pH as affected by various P sources combined with sulfur and citric acid. Dry matter yield The data presented in Table (3) show that all sources of phosphorous treatments individually or in combination with or without sulfur yielded a significant increase in the yield of maize plant (fresh and dry weight) as compared to control treatment. This trend was clearly observed in both 60 and 90 days after sowing, yet growth is markedly higher at 90 days. Significantly differences in maize yield (fresh and dry weight) was observed with SSP (540, 202.8 g/plant) and TSP (509, 176.8 g/plant) compared to RP treated plot (182, 81.2 g/plant). Soils treated with SSP and TSP had higher fresh as well as dry weight compared to RP (Table 3). The treatments receiving phosphate fertilizer with sulfur had higher yield than those without sulfur application. Rajan et al., (1996) Mixing of sulfur with RP or SSP resulted in increasing in the yield of permanent pastures compared to RP or SSP application alone. Dry matter of maize in soil treated with SSP-S was higher than that when conventional SSP was added. This increase in the yield may provide an evidence for the effectiveness of elemental sulfur mixed with SSP in maintaining high level of plant available P in the soil (Fig. 1). Higher yield were obtained with 20 % charged citric acid than 10 % (Table 3). The fresh yield of maize crop associated with SSP or TSP mixed with S+20 % citric acid was about 3.76 and 3.67 times that of the control treatment for fresh weight and 2.88 and 2.73 times for dry weight, respectively. The effective utilization of phosphorus sources in combination with sulphur was obvious because this element decrease soil pH, which helped in transformation of insoluble P to available form. This was also evidenced from the higher amount of available P (SSP+S+citric acid). 110
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Journal of Applied Science Studies - Ozean Publications

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