As Beeson has pointed out (4), fertilizing and liming practices influence the mineral composition of plants. Consequently it seemed desirable to make a survey of these practices as employed on the fields from which the samples were selected. The data from this survey are summarized in Table 1 below. It is important to note the relatively high rates at which fertilizer is applied in the coastal-plain states as compared to the rates employed farther west. In the east north-central states less dependence is placed on fertilizers and greater use is made of clover sods and manure. Only relatively small amounts of fertilizer are used in Colorado.
The rate of use of lime increases from Georgia northward to New Jersey. It varies considerably from farm to farm in the east north-central states. No lime was used on the Colorado farms.
|Farmers using fertilizer (%)||Amount fertilizer per acre (lbs.)||Quantities (nutrients per acre)||Farmers using sidedressings (%)|
|N (lbs.)||P2O5 (lbs.)||K2O (lbs.)|
|Eastern coastal states||100||1,500||90||120||120||50*|
|East north-central states||40||500||20||60||50||5**|
* Usually nitrate of soda or additional complete fertilizer.
** Some carrier of nitrogen.