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Most soils of Hawaii contain high amounts of iron- and aluminum oxides or amorphous alumino silicate clays, which react strongly with P making it virtually unavailable for plant uptake. Acceptable crop production is not possible unless adequate P fertilizers are applied. Growers need to know if a soil needs P and if so how much. The Farmer's Bookshelf hypermedia information system, which runs under the software HyperCard, can quickly provide these answers. A screen is displayed in which the soil series and the crop to be grown are specified through pull-down menus. The user then enters the Truogextractable P value of the soil and clicks on a “Calculate” button. The soil solution P value is calculated and compared to the minimum soil solution P needed to adequately grow the crop (80% to 95% of maximum yield). If the value is greater than the minimum value, then P fertilizer is not recommended. Otherwise, the program recommends the amount of fertilizer to add as P, P 2 O 5 , and treble superphosphate in pound per 1000 square feet and pound per acre. The recommendations, presented in a table, can then be printed for clientele use.

Farmer's Bookshelf Information System for Predicting Phosphorus Requirements of Some Hawii Soils