Food for Plants. 



187 



Fertilizer Experiments on Meadow Land. 



(Kentucky Agricultural Experiment Station 



Bulletin, No. 23, February, 1890.) 



On low and decidedly wot land: 



Enqlish Blue Grass. 



Yield of 

 Amount Hay in 



Per Acre Pounds 



Fertilizers used per Acre in Pounds Per Acre 



Sulphate of potash 160 3,000 



Muriate of potash 160 2,950 



Xitrate of Soda 160 3,100 



Sulphate of ammonia 130 3,600 



No fertilizer • • • 2,850 



Stable manure 20 loads 2,9/0 



Tobacco stems 4,000 4,700 



Fertilizer Experiments on Meadow Land. 

 Timothu 



Yield of 

 Amount Hay in 



I'er Acre Pounds 



Kind of Fertilizer Used in Pounds Per Acre 



Sulphate of potash 160 1,900 



Muriate of potash 160 2,.320 



Xitrate of Soda 160 2,670 



Sulphate of ammonia 130 2,520 



Xo fertilizer • • • 1^620 



Stable manure 20 loads 2,200 



Tobacco stems 1.000 3,350 



Time Required for the Complete Exhaustion of Available Fer- 



tihzing- Materials and the Amounts of Each Remaining 



in the Soil During a Period of Seven Years. 



(From Scottish Estimates.) 



On Uncultivated Clay Loam. 



Exhausted Per cent, remaining in soil unexhausted 

 Kind of Fertilizer Used (in years) at the end of each year 



12 3 4 3^ 7 



Ume 12 80 65 55 45 35 25 20 



Bone mVaV : : : : : : 5 60 30 20 10 on 00 00 



Phosphatic g-uanos 5 50 30 20 10 00 00 00 



Dissolved bones and plain , «,^ 



superphosphates 4 20 10 5 00 00 00 00 



Hiffh o-rade ammoniated fer- 



ttlizexs, ouano, etc 3 30 20 00 00 00 00 



Cotton-seed meal 5 40 30 20 10 00 00 



Barnvard manure 5 60 30 20 10 00 00 00 



