222 



FOOD FOR PLANTS 



Fertilizer Experiments on Meadow Land. 



(Kentucky Agricultural Experiment Station, Bulletin No. 23, 



February, 1890.) 



On low and decidedly wet land : 



English Blue Grass. 



Yield of 



Amount Hay in 



Per Acre Pounds 



Fertilizer Used per Acre in Pounds Per Acre 



Sulphate of potash 160 3,000 



Muriate of potash 160 2,950 



Nitrate of soda 160 3,100 



Sulphate of ammonia 130 3,600 



No fertilizer 2,850 



Stable manure 20 loads 2,970 



Tobacco stems 4,000 4,700 



Fertilizer Experiments on Meadow Land. 



Timothy. 



Yield of 



Amount Hay in 



Per Acre Pounds 



Kind of Fertilizer Used in Pounds Per Acre 



Sulphate of potash 160 1,900 



Muriate of potash 160 2,320 



Nitrate of soda 160 2,670 



Sulphate of ammonia 130 2,520 



No fertilizer 1,620 



Stable manure 20 loads 2,200 



Tobacco stems 4,000 3,350 



Time Required for the Complete Exhaustion of Available 

 Fertilizing Materials and the Amounts of Each Re- 

 maining in the Soil During a Period of Seven Years. 



(From Scottish Estimates.) 

 On Uncultivated Clay Loam. 



Exhausted Per cent remaining in soil unex- 

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



12 3 4 5 6 7 



Lime 12 80 65 55 45 35 25 20 



Bone metal 5 60 30 20 10 00 00 00 



Phosphatic guanos 5 50 30 20 10 00 00 00 



Dissolved bones and plain super- 

 phosphates 4 20 10 5 00 00 00 00 



High grade ammoniated fertilizers, 



guano, etc 3 30 20 00 00 00 00 00 



Cotton-seed meal 5 40 30 20 10 00 00 00 



Barnyard manure 5 60 30 20 10 00 00 00 



