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Volume 6, Issue 4, August Issue - 2018, Pages:732-738

Authors: Sanjay Swami, Alok Maurya
Abstract: A pot culture experiment was conducted at School of Natural Resource Management, College of Post Graduate Studies, Central Agricultural University, Umiam, Meghalaya during Rabi season of 2016-17. The experiment was consisted of 24 treatments viz., 2 types of soil (Alfisol and Inceptisol), 2 sources of P (single super phosphate and Mussoorie rock phosphate) and 6 levels of P (0, 30, 60, 90, 120 and 150 mg P kg-1 of soil). Rapeseed (cv. M-27) was raised as test crop. The experiment was conducted in completely randomized design and replicated thrice. The highest mean dry matter yield of rapeseed (16.1 g pot-1) was recorded with 120 mg P kg-1 of soil (P5). Further increase in the levels of P by 150 mg P kg-1 (P6) of soil significantly decreased the dry matter yield by 4.6% over P5. The dry matter yield produced with RP was of lower order as compared to SSP at each levels of P irrespective of soil type. The concentration of P in plant dry matter of rapeseed increased with each successive levels of P in both soils and with both of P sources. The highest soil available P (64 kg ha-1) was recorded in Inceptisol with P6 under SSP, whereas the least soil available P (8.2 kg ha-1) was recorded in Alfisol with control under RP. The critical limits of available P was established by using LRP model as 38.5 and 31.0 kg ha-1 through RP and SSP in Alfisol, whereas in Inceptisol, the critical limits values were recorded as 37.0 and 29.5 kg ha-1 under RP and SSP, respectively.
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