The objective of this work was to investigate the effect of molybdenum, phosphorus and sulfur on the growth and elements content in wheat (Triticum aestivum L) grown under saline soil conditions. To achieve this work, a field experiment was conducted at the experimental research station of Faculty of Agriculture, Saba Basha, Alexandria University. Four rates of molybdenum (0, 50, 100, and 200 g Mo /fed.), four phosphorus rates (0, 7.5, 15 and 22.5 kg P/fed.) and four sulphur rates (0, 50, 100 and 200 kg S/fed) were applied in a split split plot design with three replicates. Molybdenum, phosphorus and sulphur significantly improved grain yield of wheat. The highest grain yield (1.91 ton/ fed) was obtained with application of 200 kg S/ fed, 22.5 kg P/fed and 100 g Mo/fed rates. The contents of N, P, K, and S in wheat leaves were also increased due to phosphorus and sulphur application rates, but Mo concentration in the leaves was depressed due to sulphur application and increased with phosphorus and molybdenum applications.

Variation in stem diameter and other stem attributes of wheat in relation to yield components were analyzed in a 7-parent F1 diallel cross in favorable, drought and combined drought heat environments. In addition 12 F2 populations were also tested under heat stress. Polygenes with mainly additive effects were involved in the control of stem diameter which segregated in normal distributions in the F2. The narrowsense heritability was of comparable magnitude under favorable (0.73); drought (0.62) and drought + heat stress (0.76). Whereas, heritability of stem dry weight was reduced under stress. Non-allelic duplicate interaction was operating for stem density under drought stress. Stem diameter was positively correlated under both drought and drought + heat stresses with stem weight and stem density. Stem diameter was significantly associated with 1000 kernel weight and grain yield per spike in the three environments. On he other hand stem density was only associated with single grain mass under favorable condition and with grain yield per spike under drought stress only. Such strong associations of stem diameter with single grain mass and grain yield per spike under stress indicated the importance of this character which plays a role in sustaining grain filling through providing greater capacity of storing assimilates in the stem before mobilizing it to grains.