Phosphorus fertility build-up under different cropping systems

• Published in: Pakistan Journal of Agriculture, Agricultural Engineering Veterinary Sciences(Pakistan) Vol. 20; no. 1
• Main Authors: Puno, H.K, Memon, K.S, Memon, M.,Sindh Agriculture Univ., Tandojam(Pakistan). Dept. of Soil Science
• Format: Journal Article
• Language: English
• Published: 01.06.2004
• Subjects: CLAY SOILS; CROPPING SYSTEMS; LOAM SOILS; TRITICUM AESTIVUM; ZEA
• ISSN: 1015-3055

Soil test-crop response studies were performed in a long- term experiment.The soil of the experimental area was a Sultanpur series (clay loam surface)belonging to sub-group typic camborthid. It was alkaline (pH 8.3), calcareous(CaCO3 8.7%), low in organic matter (0.6%) and Olsen P (2.79 mg kg-1) andadequate in K (1.0 me 100 g-1). The study involved three annual wheat-basedcropping systems (wheat- corn (WC), wheat-fallow (WF) and wheat-soybean (WS))and six rates of P (0, 30, 60, 90, 120 and 150 kg P2O5 ha-1). The experiment waslaid out in a split-plot design with three replications. The P fertilizer treatmentswere applied to each crop in the system. After seven cropping seasons, theaverage values of soil test P (Olsen) increased to 7.09, 6.90 and 8.34 mg P kg-1under WC, WF and WS systems respectively. The mean values of PhosphorusFertility Build up Factor (PFBF) for WF, WS and WC cropping systems were 19.05,25.82 and 37.43 respectively. Thus, P fertility under WF cropping system could bebuild up easier and faster than in WS or WC systems. Therefore, the order offertility build up in different cropping systems used in the present study wasWF, WS and WC.