8Evaluation of soil chemical properties and maize plant growth in partial root-zone drying drip irrigation and deficit irrigation using wastewater

Today's world water per capita is declining, and one of the major challenges facing agriculture in the present day is producing more food from less water. Therefore, the need to use new sources of water such as treated wastewater is more than ever fell. Also, the application of new methods of irrigation is inevitable. One of the new methods of irrigation is partial rooting irrigation. This research investigates the effects of different methods of irrigation and the use of effluent on SC704 corn in field conditions. The research was carried out in the field of research of Campus Abourihan-Tehran University in the field of 2017 in Isplit Plot with three replications. Irrigation treatments included ordinary full irrigation FI, irrigation of 75% water requirement DI75, 55% water irrigation using DI55, full irrigation with partial rooting irrigation PRD100, 75% irrigation with partial rooting irrigation PRD75 and irrigation 55% of the requirement was due to the incomplete irrigation of partial rooting irrigation PRD55. Biomass weight, grain yield, yield components (1000 seed weight, seed number per row, ear diameter, ear height, total ear weight), water use efficiency was measured in final harvest, as well as protein and nitrogen percent for grain And leaf, stem measured. Also, due to soil sampling, some soil chemical properties were obtained at the end of cultivation. According to statistical analysis and comparison of mean values based on Duncan test and 5% significance level, it was found that in all traits of biomass, grain yield and yield components between irrigation treatments and irrigation, 75% of water requirement had a no significant difference. There was no significant difference in biomass and grain yield between two types of water in water type. There was a significant difference between two irrigation methods for biomass and grain yield, and ordinary irrigation showed better results than partial rooting irrigation. In the case of nitrogen and leaf and stem protein percent only irrigation method showed partial rooting irrigation had more and significant values with normal irrigation. In water use efficiency, 75% of the water requirement was the most, while ordinary irrigation reported better results than partial rooting irrigation. Soil analysis also showed EC and calcium and magnesium in irrigation with well water is more than wastewater, also for irrigation, Bicarbonate, potassium and nitrogen percent irrigation with wastewater shows higher amounts than irrigation with well water. Electrical conductivity, calcium and magnesium, potassium and nitrogen content in the level of 75% of the water requirement had the highest amount among irrigation levels. Electrical conductivity, calcium and magnesium, as well as potassium, were higher in partial rooting irrigation methods. In general, the results indicate that application of irrigation treatment at 75% level does not result in a significant reduction in the amount of the product. Also, the use of wastewater improves the quality and the relative increase of the product.

8Evaluation of soil chemical properties and maize plant growth in partial root-zone drying drip irrigation and deficit irrigation using wastewater Keywords:

Unconventional water , Water use efficiency , yield , Heavy elements