This de?ciency is especially detrimental with regard to fruit and other plants that are as much in need of retained fertilizer content as they are in need of fertilizer applica
tion. It is becoming increasingly important to tailor a fertilizer material to the particular soil conditions in order to have plant food available over a substantial period for the crops which are to be fertilized.It is also well known that trace elements such as boron,manganese, zinc, copper, iron and possibly molybdenum are necessary for the proper growth of plants. Most soils have su?icient trace elements present, but quite oftende?ciencies of one or more of these elements results in
loss of foliage, loss of green color, wilting, spotting, stunting of growth, and loss of resistance to disease, or the like.When fertilizers are used on soils originally having sufficient amounts of trace elements, the supply may be depleted because of the accelerated plant growth caused by optimum major nutrient conditions. This is particularly true where arti?cial fertilizers are used, since their proc~esses of manufacture generally utilize relatively pure chemicals for producing such fertilizers as ammoniumnitrate, ammonium sulfate, urea, and the like. When the fertilizer material employed is prepared synthetically, itis advisable to add trace elements to the fertilizer material of this invention.