FORMS AND Q>I RELATIONSHIP OF PHOSPHORUS IN IMPORTANT SOIL SERIES OF CENTRAL CAMPUS FARM RAHURI
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Date
30-12-94
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MAMMA PHULE KRISHI VIDYAPEETH RAHURI, 413 722 DIST- AHMEDNAGAR. Maharashtra State (India)
Abstract
T?he studies on forms and Q/I relationship of phosphorus in six widely spread soil series v i z . , Nimone, Otur (Vertisol), Sawargaon, Dholwad (Inceptisol), Pargaon and Khanapur (Entisol) of Central Campus Farm Rahuri were carried out to understand the behaviour of phosphorus in surface and subsurface layers of these s o i l s . Neubauer technique experiment was also conducted with wheat as a t e s t crop t o evaluate phosphorus f e r t i l i t y of these s o i l s. The soils under investigation were alkaline, clay t o clay loam in texture, low t o moderately high in organic carbon with high CEC. The t o t a l P content of the soils was quite high. The t o t a l mineral P contents were also quite high which might be attributed to the high contents of Ca-P and reductant soluble P in these s o i l s . The Ca-P contributed to the bulk of the t o t a l -P (46 %) followed by Red-P (6.7 %) in a l l the soil s e r i e s under study with equilibrium among the different forms as evident from the significant relationships among various forms of P. MPKV, Rahuri Soil S c i. Higher values of P when 3H2P04 i s 0 (QQ) and p o t e n t i a l buffering c a p a c i t y of P (PBC) were recorded by Nimone, Otur, Sawargaon and Dholwad s e r i e s in comparison with Pargaon and Khanapur s o i l s e r i e s i n d i c a t i n g the d i f f e r e n t i al behaviour of phosphorus in t h e s e s o i l s . This may be a t t r i buted t o the d i f f e r e n c e s in physico-chemical c h a r a c t e r i s t i cs of these s o i l s . The H~PO. at equilibrium (I_) values were 2 4 e higher in Pargaon and Khanapur series as compared to other soils which might be due to the lower clay content. The results of Neubauer technique showed no much variation in dry matter accumulation in wheat. The Nimone, Otur, Sawargaon and Dholwad series, in general, recorded higher concentration and uptake of P by wheat cv. HD 2189 (Trltlcum aestlvum L.) as compared to Pargaon and Khanapur series indicating the differential P supplying power of the soils.