Study of Nitrogen Nutrition Index, Seedling Index, Concentration Nitrogen and Wheat Yield in Different Nutritional Regimens

Nitrogen and phosphorus are much in demand in plant and is known as elements limiting growth and yield in crops. In order to study yield, nitrogen nutrition index (NNI), Chlorophyll index and nitrogen concentration under different regimes nutrition in wheat, a factorial experiment based on a randomized complete blocks design with four replications was done on the research field of Golestan province during growing seasons 2014-2015 and 2015-2016. The experimental factors were there net nitrogen fertilizer rates of 0, 75 and 150 kg N ha-1 and five net phosphorus fertilizer rates of 0, 20, 40, 60 and 80 kg P ha-1 .According to the results, traits under study in each three stage follow from simple linear regression model, as in each level nitrogen from different levels phosphorus, with increase rate of consumed phosphorus, traits under study were prospered from increasing trend and the maximum traits were recorded with 80 kg P ha-1 that yield was not showed significantly difference analysis with consumption of 60 kg P ha-1. Also The results this experiment showed that very strong relation is between nitrogen nutrition index(NNI), chlorophyll index and nitrogen available to plant, In view of the fact that measurement concentration nitrogen is very costly, take up time and need to expensive equipment, so measurement chlorophyll index by hand chlorophyll meter and transportable is very comfortable. in addition on nitrogen, phosphorus must be considered, also in order to reach to maximum yield consumption of 60 kg P net ha-1 is recommended.