Black Sea Journal of Agriculture

Yazarlar: Aftab JAMAL, Muhammad İlyas DURRANİ, Muhammad Sarirullaha SARİR

Konular:Mühendislik, Ziraat

Anahtar Kelimeler:Incubation,Mineralization,Mapping,Swabi

Özet: Laboratory incubation study was conducted to assess the changes in soil Phosphorous (P) concentration of some maize growing areas of district Swabi with time. A total of twenty two rhizosphere soil samples were collected from important soil series of some maize growing areas of district Swabi. 400 g soil from each series was incubated for 6 weeks at field moisture condition and 25±20C.P was determined periodically after each week. All the soils were also analyzed for physico-chemical properties and micronutrient status. Almost all the soil samples were found normal, alkaline in reaction, low in organic matter content and slightly to strongly calcareous in nature, all the soil samples were found silty clay loam in texture except Chota Lahore soil which was found sandy loam in texture. Results showed periodical changes in soil AB-DTPA extractable P over incubation period. When averaged across all soil series P increased from 8.15 at week 0 to 9.14 at week 2 which declined at week 3 and increased again from  8.84 at week 3 to 12.0 at week 5  but then declined again to 9.89 at week 6. Mean rate of P turnover was -0.32, 0.46, 0.20, 0.57, 0.7 and 0.28 mg kg-1 wk-1 at week 1, 2, 3, 4, 5 and 6 respectively. P turnover was affected by initial P concentrations at all levels of incubation, giving high net P turnover in low P soils followed by medium P soils. These mineralized P from insoluble sources should be considered while making recommendation for low or medium P soils.

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