EFFECT OF LONG-TERM APPLICATIONS OF P FERTILIZERS AND CROP RESIDUES ON P ADSORPTION AND P BALANCE IN SOILS UNDER CORN-CLOVER CROPPING SYSTEM | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 5, Volume 32, Issue 4, April 2007, Page 3217-3229 PDF (682.95 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2007.201149 | ||||
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| Authors | ||||
| H.M.A. Raghib; Hala H. Gomah; M.F. Ghoneim; M.H. Raslan | ||||
| Department of Soil and Water, Faculty of Agriculture, Assiut University. | ||||
| Abstract | ||||
| In the permanent experimental site, started in 1988, in the farm of Soils and Water Department, Assiut University, ground corn stover and ground clover straw (CR) were incorporated in the surface (0.00- 0.25 m) soil layer at an average rates of 5.45 ton fed-1 year-1 and 3.71 ton fed-1 year-1, respectively. Six rates of fertilizer P fertilization (0, 100, 200, 300, 400, and 500 kg superphosphate fed-1) were also applied each season. The results showed that the amount of Olsen's Pt required to give the maximum P uptake in grains was equal to 46.8 and 51.4 ppm P in P fertilization management without crop residues (-CR) and with crop residues (+CR), respectively. In both P fertilization managements (-CR and +CR), P application significantly (p < /em>≤0.05) and curvilinearly increased the dry matter accumulation and grain yield of corn plants. The P apparent balances showed that in both P fertilization managements (with and without CR), P fertilization rate of 62 kg P2O5 fed-1 (400 kg SP fed-1 each growth season) and higher were more than the requirements of corn-clover cropping system, and resulted in accumulation of P in soil. Phosphorous adsorption in the surface layer of soil treated with all levels of mineral P fertilizer appeared to be decreased with incorporation of crop residues into soil | ||||
| Keywords | ||||
| P uptake; P balance; long term; crop residues; P adsorption | ||||
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