The effect of returning Eruca Sativa and Vicia villosa residues at different nitrogen levels on soil chemical characteristics and purslane production in the semi-arid region of Birjand, Iran

To investigate the effect of return of Eruca residues and hairy vetch at different levels of nitrogen on the yield of purslane seeds, an experiment was conducted in two crop years ۲۰۱۳-۲۰۱۴ and ۲۰۱۴-۲۰۱۵ in the research farm of Birjand University. This experiment was carried out as a split plot based on a randomized complete block design with three replications. The factors included four levels of return of plant residues (Eruca, hairy vetch, mixture of Eruca and hairy vetch and control) as main plots and three levels of pure nitrogen (۰, ۵۰, and ۱۰۰ kg ha-۱) as sub plots. The traits studied in this experiment included: organic carbon and soil nitrogen percentage, soil absorbable phosphorus, soil pH and EC, and biomass nitrogen percentage. The results showed that the use of plant residues increased the percentage of organic carbon, soil nitrogen, and absorbable phosphorus and decreased soil pH. Among the treatments of the studied plant residues, the hairy vetch was superior to the others. Also, the use of nitrogen fertilizer increased the amount of absorbable phosphorus, soil electrical conductivity, and grain yield and decreased soil pH. According to the results of this experiment, to reduce the consumption of chemical fertilizers along with sustainable agriculture, to absorb the maximum amount of nitrogen in the biomass of purslane, the mixture of Eruca and hairy vetch without the use of nitrogen fertilizer is recommended. also to achieve the maximum yield of hairy vetch treatment and ۱۰۰ kg N ha-۱ in Birjand area is suitable.

کلیدواژه ها:

Plant residues ، Purslane ، Nitrogen ، Soil properties