Effect of some treatments on alleviating of environmental stress on growth and yield of squash (Cucurbitta pepo L.)

An experiment was conducted during 2013-2014 growth seasons at the field of Agric. Coll., Babylon Univ., Iraq. , to study the effect of polyoxal (as poly hydro carboxylic applied on soil, i.e. 2 mg / l at the rate of 1L.m-1) and its interaction with foliar application of humic acid, organic (N and Fe) and salicylic acid 0.5 mM at 4 and 6 leaf stages as well as control on alleviating soil salt stress on growth and yield of squash. Randomized complete block design with three replications was used. The results showed that : Adding polyoxal to the soil caused a significant increases in leaf number, leaf chlorophyll content, fruit yield and leaf content percentage of Nand P. Foliar application treatments caused a significant increase in leaves number per plants, chlorophyll content and N percentage compared to control but it had no significant effect on leaf P percentage. Humic acid had a significant effect on fruit yield.plant-1. The interaction had a significant effect on the studied parameters and polyoxal with humic acid was the best.