Response of maize to mineral and bio-phosphorus fertilization under different irrigation intervals [electronic resource].

A field experiment was conducted at Giza Agricultural Research Station, ARC, in 2005 and 2006 seasons to study the response of maize single cross SC 123 to mineral phosphorus and biofertilization under different irrigation intervals Treatments applied were three irrigation intervals (14,21 and 28 days), two rates of phosphorus (15 and 30 Kg P₂O₅ / faddan*) in the form of calcium and 30 Kg P₂O₅ / faddan*) in the form of calcium super-phosphate (15.5 % P₂O₅) and uninoculation or inoculation of seeds with bio-fertilizer "phosphorein". Experimental design was spilt-plot, where irrigation intervals were assigned to the main plots and phosphorein and phosphorus treatments in the sub-plots. Proionged irrigation interval from 14 to 21 days did not affect most of the studies growth and yield traits. However, increasing irrigation interval up to 28 days significantly reduced all the studied traits, except for proline content, which was increased. Data also indicated that raising the rate of phosphorus fertiliit:r from" IS to 30 kg P₂O₅ per faddan induced significant increases in plant height, dry. weight of shoot /plant, specific leaf weight maximum, quantum yield, ears weight / plant, 100-grain weight, grains and stover weights / plant as well as per faddan (fad). Also; percentages of carbohydrates, total sugars, crude protein and phosphorus in mature grains were significantly increased as a result ofraising phosphorus fertilizer rate. Phosphorein inoculation showed significant increases in all growth and yield traits under investigation compared with ,uninoculated grain.

Summary in Arabic.

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