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publication name INcREASING THE EFFICIENCY OF P FERTILIZER BY MIXING ORDINARY CALCIUM SUPER-PHOSPHATE WITH SEEDS OF FIELD BEAN (Vicia faba L..).
Authors Abdel-Salam, A.A.; Roshdy, A. and El—Shaikh, F.T.Z.
year 1988
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Abstract

In two seasons (1986/87 and 87/88), phosphorus ferti— lizer was applied as ordinary calcium superphosphate (OCSP) mixed with seeds of field beans (Vicia faba L. cv. Giza 2) at rates of 7.0, 10.5 and 14 kg p/fad. (16, 24 and 32 kg P205/fad.), It caused more growth and gave 57 and 14% mroe yield at the low and high rates than broadcast, and 37 and 19% more yield at the same respective rates than banding. Mixing ocsp with seeds has the same advantage as its banding in keeping the contact of fertilizer with soil to minimum P fixation. It also has the further advantage of securing sample P in the vicinity of seeds, and seedling roots at the earliest possible stage in crop life, both of which are crucial fer growth and yield. Uptake of N, P and K as well as seed yield were all increased by this method. Under Egyptian conditions of (a)-soils being mostly clayey or calcareous or both and (b)-OCSP being powdered, appreciable fixation of P is invevitable; hence, this method is imperative especially if conditions dictate low rates. INTRODUCTION Legume crops including field beans (Vicia faba L.) need supply of available P for healthy growht and high yeilds. Applying (OCSP) up to 10.5 kg P/fad. (24 kg P205) to beans on a clay loam soil, Roshdy (1975), attributed the lack of response in seed yield to the ample soil P (20 ppm Na—bicarbonate extractable). El—Moghraby (1980), later on, grew beans on the same soil (different field) and obtained significant response but at tىuch higher rates of up to 28 kg P/fad.

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