Question: query regarding reddish yellow colouration in rice field.  
Answer: since your are not using ang fertilizer in your rice field till now, please broadcast the recomended doses of fertilizer in your field - urea 12 kg, super 8 kg and potash 2 kg per bigha of land . for better production please spray mohaphol or sagarika 2ml per liter of water in the evening time in the absence of rain one at befofe flowering and once at the time of flowering.