questions: telling that he is having 5 numbers of lemon trees which are in their 4th year stage and has never applied fertilizer. asking the dose of fertilizer to be applied. 
 answers: suggested to apply urea 1320 gram, single super phosphate 2500 gram, muriate of potash 970 gram along with 20 kilogram of farm yard manure per tree. this suggested dose is to be applied in two equal parts. one part in march-april and the other part in october-november.