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Accueil du site → Doctorat → Royaume-Uni → 2005 → Novel sources of phosphours [i.e. phosphorous] for wheat cultivation in the South of Libya

University of Newcastle upon Tyne (2005)

Novel sources of phosphours [i.e. phosphorous] for wheat cultivation in the South of Libya

Ahmed, Sanussi Yonees

Titre : Novel sources of phosphours [i.e. phosphorous] for wheat cultivation in the South of Libya

Auteur : Ahmed, Sanussi Yonees.

Université de soutenance : University of Newcastle upon Tyne

Grade : Doctor of Philosophy (Ph.D.) : 2005

Résumé
Pot trial experiments were conducted during the growing season 2002, 2003 and 2004 in the greenhouse of Newcastle University at the Close House Experimental Station, Heddon, to investigate for the first time the effect of struvite on the growth and yield of wheat plants under similar growth conditions (temperature and soil properties) to those at Wady Barjuj in the south of Libya. They compared the use of Gafsa ground rock phosphate (GRP) and dicalcium phosphate with struvite. They also investigated movement of P from GRP in unplanted soil, and from prills of struvite, GRP and dicalcium phosphate. The treatments comprised the addition of struvite (29% P2O5), dicalcium phosphate (52% P2O5) added equivalent to 140 kg P2O5/ha and GRP (29.5% P2O5) added at 420 kg P2O5/ha. They compared coarse versus powder application, addition of ammonium sulphate versus urea as N source, band application versus broadcast, and prilled GRP versus coarse GRP. Yield was greatest for struvite, with seed weight and plant height 12% and 107% greater than for dicalcium phosphate and for GRP respectively. The maximum yield obtained is equivalent to 7 tonne/ha wheat grain with struvite compared with 5-7 ton/ha currently achieved. The use of ammonium sulphate with GRP reduced soil pH by up to 1 pH unit and increased yield by 40% compared with the same application of GRP with urea. A reduced particle size for the P sources increases yield for struvite by 20%, but not for GRP. Application of double amounts of GRP did not increase yields of wheat significantly. Very little difference is seen between band and broadcast application, with slightly higher yields for band application. There was a positive correlation between seed weight and weight of straw, and also between plant height and plant dry weight.

Présentation : EThOS (UK)

Accès au document : Proquest Dissertations & Theses

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