Show discussed in a new bulletin the utah utah agricultural experiment station has just released a publication on or more commonly called yellowing of plants dr F B warm wann the author states that the most frequent cause of is the lack lack of nitrogen magnesium and iron iron in the plant itself however an excess water supply or an n overabundance over abundance of alkali salts in in the soil may also be contributing factors as well as low temperatures pera tures and lack of light the author suggests two possible methods of control 1 the mechanical application of iron on the plant by spraying or by its injection into the plant body and 2 soil treatment consisting of the addition of manure ammonium sulfate or sulphur sulp hur to the soil copies of circular 85 yellowing of plants may be obtained without cost by addressing the division of publications utah agricultural experiment station logan utah |