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Distribution and transformation of phosphorus forms in soil after long-term applications of P fertilizer and crop residues [electronic resource].

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Raghib, H. M. A

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Language: English Summary language: Arabic Description: p.3231-3251Other title:

توزيع وتحولات الصور المختلفه للفوسفور فى التربه تحت تأثير الاضافات المستمره لبقايا المحاصيل والسماد الفوسفاتى [Added title page title]

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Mansoura University journal of agricultural sciences, 2007 v. 32 (4) [electronic resource].

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In: Mansoura Unviersity Journal of Agricultural Sciences 2007.v.32(4)Summary: Two rates of crop residues (·CR and +CR) and six rates of P fertilizer (0, 100, 200, 300, 400, and 500 kg superphosphate fed⁻¹) were applied each growing season (com and clover) in a long-term field experiment started at the Experimental Farm of Assiut University, Assiut, Egypt. The crop residues were added to the soil at the end of each growth season at rates of 5.45 and 3.71-ton fed⁻¹ corn stover and Egyptian clover straw. The response of soil P fractions to both CR and superphosphatr fertilizer was small at the very beginning of the experiment, however it became more pronounced starting from the year 1999 up to the year 2003. Resin·P accounted for 0.81· 0.93%; and 1.30· 1.52% of total P in soil after 5 and 16 years of continuous application of CR and SP, respectively. At zero level of SP and no addition of CR the resin·P fraction was markedly decreased from 6.5 to 5.65.

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Two rates of crop residues (·CR and +CR) and six rates of P fertilizer (0, 100, 200, 300, 400, and 500 kg superphosphate fed⁻¹) were applied each growing season (com and clover) in a long-term field experiment started at the Experimental Farm of Assiut University, Assiut, Egypt. The crop residues were added to the soil at the end of each growth season at rates of 5.45 and 3.71-ton fed⁻¹ corn stover and Egyptian clover straw. The response of soil P fractions to both CR and superphosphatr fertilizer was small at the very beginning of the experiment, however it became more pronounced starting from the year 1999 up to the year 2003. Resin·P accounted for 0.81· 0.93%; and 1.30· 1.52% of total P in soil after 5 and 16 years of continuous application of CR and SP, respectively. At zero level of SP and no addition of CR the resin·P fraction was markedly decreased from 6.5 to 5.65.

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