Two field experiments were carried out in a private farm at Gamassa district, Belqas Center, Dakahlia Governorate, Egypt, during the two successive summer growing seasons of 2013 and 2014 to study the effect of mineral nitrogen fertilizer rates, organic manure and foliar fertilization treatments with biofertilizers , biostimulants as well as their interactions on growth and yield of cantaloupe cv. Primal. The field experiments were laid-out in strip-split plot design with three replications. The most important results obtained from this investigation can be summarized as follows:Increasing mineral nitrogen fertilizer rates from 75 to 100 and 125 kg N/fed tended to increase growth, yield and its components, thus the highest values of these characters were resulted from adding the highest rate of nitrogen fertilizer (125 kg N/fed) in both seasons.Organic fertilizing of cantaloupe plants with chicken manure at the rate of 15 m 3 /fed significantly increased growth, yield and its components as compared with control treatment (without organic manure) in both seasons.Foliar spraying cantaloupe plants with yeast extract at rate of 5g /1L significantly surpassed other treatments (without, spraying with EM or Agrispon) and produced the highest values of all studied growth, yield and its components in both seasons.It can be recommended that organic fertilizing cantaloupe with 15 m 3 chicken manure/fed and foliar spraying plants with yeast extract and mineral fertilizing with 100 kg N/fed in order to increase cantaloupe yield over the control treatment and reduce the environment pollution and production costs under the environmental conditions of Dakahlia Governorate, Egypt.

This study was carried out during two summer seasons of 2012 and 2013 at Sakha Horticultural Research Station Farm, Kafr El-Sheikh Governorate, on summer squash (Cucurbita pepo L.) Eskandarani cultivar to study the impact of phosphorus fertilizer levels 20, 40, 60 and 80 kg P2O5 /fed. and fruit thinning treatments;i.e., without thinning (control) , thinning the first fruit, thinning all fruits except the first and second ones and thinning the first and second fruit and their interaction on vegetative parameters and leaf chlorophyll contents.Results indicated that, the highest values of vegetative characters; i.e., stem length, plant fresh and dry weight, leaf area/plant and chlorophyll content in leaves in both seasons were recorded when plants fertilized with 80 kg P2O5 /fed. Number of leaves/plant not affected by phosphorus fertilizer levels, in both seasons. Thinning the first and second fruit produced the highest values of stem length, plant fresh and dry weight , number of leaves/plant, leaf area/plant and chlorophyll content in leaves in both seasons. On the other hand, squash plants fertilized with 80 kg P2O5 /fed. with thinning the first and second fruit produced the highest values of stem length, plant fresh and dry weight , number of leaves/plant, leaf area/plant and chlorophyll content in leaves, while, squash plants fertilized by 20 kg P2O5 /fed. with thinning all fruits except the first and second ones produced the lowest value of each character.According to the mentioned results, the best results of both vegetative growth parameters and chlorophyll contents in leaves were recorded when squash plants fertilized by 80 kg P2O5 /fed. with thinning the first and second fruit ,therefore, this treatment could be recommended for improving squash plants performance under similar condition of this study.