ملک حسین شهریاری

Tomatoes are essentially herbaceous and perennial herbs, which are often cultivated throughout the world for one year. Currently, one of the most important herbs used in Iran and the world is fresh and canned. Due to the fact that light is one of the most important factors in plant growth, higher or lower than normal levels can cause light stress in the plant. Tensions are one of the most important factors limiting growth in plants. Environmental stresses are one of the most important determinants of the distribution pattern of plants worldwide. The canopy is used to reduce light stress. The purpose of this research, was to investigate the effect of different canopies on yield and quality of tomato, which was factorial in a randomized complete block design with three replications in Dayyer city in 1396. The treatments included seven levels of canopy (Green gratings were 30, 50 and 60%, 30% bright green net, 30% yellow, and white monolithic glass placed after planting) and two planting dates (first date: 22 Mordad and date Second: a Shahrivar). After sufficient growth of the plants and suitable air temperature, the coatings were removed and some vegetative and reproductive traits were measured. Among these traits, the percentage of healthy plant, daily growth index, leaf number, number of flower spikes, number of flowers in the cluster, fresh and dry weight of the plant, fresh and dry weight of the root, vegetation index, and also qualitative characteristics such as chlorophyll a, b, carotenoid, Proline, peroxidase enzymes and polyphenol oxidase and the content of nutrients of phosphorus, potassium, calcium, magnesium and iron of the aerial parts of the tomato plant were evaluated. The average comparison of data showed that different percentages of the canopy alone had different effects on the growth characteristics of the plant. The results showed that shading treatment increased vegetative, reproductive and nutritional characteristics. In most of vegetative, reprod