Influence of Different Levels of Nitrogen and Potassium on Yield and Its Correlated Traits In Rice

Ratooning means regrowing of rice plant after harvesting of first product which isspecific physiologic characteristic of rice plant. It is an effective method for increasingof efficiency of production along with less investment and also lack of necessity forincreasing of the field of rice plant. Ratooning more over, affects on the optimal usageof agricultural field. In order to achieve this goal, the use of important and effectivefertilizer elements will be useful. In order to investigate of the effects of different levelof nitrogen and potassium on ratooning of rice, an experiment was conducted in GuilanProvince (Amlash) during 2003. The experiment was carried out suing factorial in acomplete randomized block design with eight treatments and three replications.Treatments were included 0, 50, 100 and 150 kg N / ha from source urea and 0 and 100kg K / ha from source chloral of potassium (KCL). In this experiment grain yield, yieldcomponents, harvest index, biological yield and straw dry weight were investigated.According to results effect of nitrogen was significant on grain yield, percentage offilled, grain number panicle in m2 and harvest index (HI) at 1% and on 1000 grainweight and biological yield at 5%. Effect of potassium was significant on biologicalyield, percentage of filled grain and number of panicle in m2 at 5%. Interaction betweennitrogen and potassium was significant on, grain yield at 1% and on number of paniclein m2, biological yield and harvest index (HI) at 5%. In conclusion, it can be said thatthe effect of fertilizer on ratoon yield is significant and positive in comparison to lack ofusage of it.