Effect of N level and splitting different levels of P on yield of two wheat cultivars and P use efficiency attributes using sprinkler irrigation system in sandy soil [electronic resource].

Includes references.

This investigation was conducted at the Agricultural Research Station of the Faculty of Agric., Zagazig University at Khattara for two growing seasons (2004/2005 and 2005/2006). The study aimed to investigate the response of two wheat cultivars (Sakha 93 and Gemmiza 9) to two N levels (50 and 100 kg N/fad), four P levels (check, 20, 40 and 60 kg P20s/fad) and three P splitting treatments (S₁ at sowing, S₂,1/2, at sowing + 1/2, one month latter and S3, Y, at sowing + Y, two months latter) on yielc! and its attributes and P uptake as well as P efficiency attributes under sandy soil conditions using sprinkler irrigation system. Gemmiza 9 out yielded Sakha 93 in grain yield (combined data) due to superiority in plant height (ZO· season), number of spikes/m2 (1st season), number of grains/spike (combined), thousand grain weight (combined), harvest index (combined) and total P uptake (combined). No significant cultivar differences could be detected in grain weight/spike, straw yieldHad, and all P use efficiency attributes though Gemmiza, 9 had, in most cases higher averages than Sakha 93. Doubling the level of N to 100 kg NHad was accompanied by a significant increase in each of plant height, number of spikes/m, number of grains/spike, thousand grain weight, grain weight/spike, grain and straw yieldsHad and harvest index. The total P uptake (TPU), P translocation efficiency (PTE), P apparent recovery efficiency (PARE) and P agronomic efficiency (PAE) were, also, increased but the P physiological efficiency (PPE) and P utilization efficiency (PUE) were decreased. The increase of P level up to 60 kg P₂O₅/fad was followed by a significant increase in grain yieldHad and almost all their attributes, but each P increment caused a significant decrease in each of PARE, PPE, PAE, PUE and P agrophysiological efficiency (PAPE). Data of combined analysis revealed that addition of P as Y, at sowing and 1/2, one month later produced the highest averages for plant height, number of spikes/m2 , number of grains/spike, grain yieldHad, harvest index, TPU, PTE, PARE, PUE and PAE, but delaying the addition of the second split to two months after sowing produced higher averages for thousand grain weight, grain weight/spike, PPE and PAPE.

Summary in Arabic.

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