الفهرس 
Introduction
Results and discussionOnly 14 pages are availabe for public view
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Abstract
This study was conducted during the two summer seasons of 2007 and 2008 at Abou Awad Village, Aga, Dakahila Governorate, Egypt, on summer squash Arlika F1 hybrid, to investigate the utilization of some different sources and rates of organic manures ( mineral N fertilizer, rice straw compost, chicken and farmyard manure) at 200 % and 100% of recommended rate/fed. from each source with foliar spraying of seaweed extracts (with 1g/ l and control ) compared with mineral nitrogen fertilizer at 100 % and 50 % of recommended rate/ fed. and their interactions on plant growth, yield and quality as well as mineral NPK content This study revealed the following results
1- The results indicated that most of plant growth parameters were increased by foliar spraying with seaweed extracts of summer squash 3 times by seaweed extracts at a rate 1 kg/feddan at 2,4 and 6 weeks. In addition, the treated squash plants with seaweed extracts produced more early yield, total yield and vitamin C content and lower nitrate content in fruits. Moreover, an increase in NPK content in the leaves and fruits as compared with control were detected.
2- Application of compost manure (rice straw) at 200 % of recommended rate/feddan (8.5 - 8.8 t/fed). gave the highest values of fresh and dry weight/plant, total yield and dry matter . However the best early yield was obtained with chicken manure and FYM. While, lower nitrate content in the fruits was obtained with FYM and compost.
3- With increasing the rate of organic nitrogen fertilizer addition, all vegetative growth parameters, early yield, total yield and fruits quality as well as NPK in the leaves and fruits increased.
4- The foliar application of seaweed extracts and compost of rice straw at 200 % of recommended rate gave the highest values of vegetative characters, total yield, and best quality. in fruits of summer squash plants.
Therefore, the are good opportunities to utilize and manipulate compost manure to enhance crop productivity and synonym essential to adopt a system of organic farming for obtained safe and clean food of vegetable crops against the chemical farming and also, reduce the risks of the environmental pollution.