Main and Residual Effects of Phosphate Rock, Sulfur and Thiobacillus spp Bacteria on Yield Indices of Corn and Barley

Document Type : Research Paper

Authors

1 Assistant Professor, Agricultural And Natural Resources Research Center Of Shahrekord

2 Professor, Tarbiat Modarres University

3 Professor Science and Research Campus Of Azad University, Tehran

4 Professor, Extension, Education and Agricultural Research Organization

5 Professor, Atomic Energy Organization of Iran

Abstract

The following experiments were conducted on two phases, on 2001-2003 arranged in randomized complete block design in order to study sulfur and Thiobacillus thioxidans L. on phosphorus availability of phosphate rock. The 1th phase of these experiments was performed on farm to study the main effects of treatments on corn crop, and 2th phase was carried out on farm to study the residual effects of treatments on barley crop. Following parameters were determined after crop harvesting in each phase: crop yield (dry matter yield of corn, straw yield, grain yield, harvesting index, and thousands grain weight of barley), dry matter percentage (DMP), crop growth rate (CGR), P and Zn content in leaf, relative agronomic efficiency (RAE), total phosphorus yield (TPY) and soil available phosphorus (Pava) measured for corn crop. The following results have been obtained: Main effects of treatments on dry matter percentage (DMP) and relative agronomic efficiency (RAE), were statistically significant at 1% level and main effects of treatments on dry matter yield (DMY) and crop growth rate (CGR) were significant at 5% level, but the main effects of treatments on P and Zn content in leaf, total phosphorus yield (TPY) and P(ava.) were not significant.Residual effects of treatments on straw yield were statistically significant at 5% level but the residual effects of treatments on grain yield and thousands grain weight, harvesting index and relative agronomic efficiency were not statistically significant. The results of this research showed that phosphate rock with sulfur and Thiobacillus spp, increased and yield indices of corn and barley crops, but for main and residual effects, treatments with sulfur and Thiobacillus spp had more effects than treatments with sulfur alone. Therefore, we can recommend treatments with sulfur and Thiobacillus spp for increasing main and residual effects on corn and barley crops.

Keywords

References

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Iranian Journal of Soil Research
Volume 21, Issue 2
February 2008
Pages 191-200

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