AbstractThe use of various fertilizer treatments on the Plamar variety of tomatoes growing on a Coto clay at the Isabela Substation revealed that: 1. The use of 100 pounds of N per acre gave significantly higher yields of commercial tomatoes per acre than either none or 200 pounds of N per acre. 2. Phosphate fertilizers increased tomato yields, the highest yields being obtained with 200 pounds of P2O5 per acre. 3. There was no response to potash fertilizers. 4. The use of 20 tons of filter-press cake per acre gave significant increases in yields over the no-fertilizer treatment. 5. When 20 tons of filter-press cake were used combined with 100 pounds of N and 200 pounds each of P2O5 and K2O per acre, the yields obtained were superior to those when the filter-press cake or chemical fertilizer were used alone. 6. No yield increases were obtained with magnesium and boron additions to the N-P-K fertilizer applications.
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