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30 tons acid phos Acid phosphate altho amount of manure Amounts of Nitrogen animal manures annual application application of lime applied artiﬁcial fertilizers average yield beds BULLETIN 408 chemical elements chemical fertilizers complete fertilizer compost soil cover crop crops of lettuce cucumbers elements experiments here reported fertilizer per acre Fertilizer Treatments FERTILIZERS FOR GREENHOUSE ﬁndings ﬁrst crop Grand Rapids lettuce green manure crop greenhouse crops Ground limestone grower harvest higher in yield higher than Plot higher yield hydrogen-ion concentration increase leaf lettuce lettuce per plot Marietta Muriate of potash Muriate potash Nitrate of soda nitrogen OHIO EXPERIMENT STATION Phosphoric Acid plant food materials plot of 42 plot received plots in Series Pounds of washed pounds per acre produce salts secured surface soil tilizer tomatoes tons of manure tons per acre unfertilized plots untreated plots vegetables washed lettuce Yield of Lettuce