154 LESSONS IN AGRICULTURE 



Mix the 'fertilizers into the soil; then plant about 

 a dozen grains of wheat in each pot. Label each pot 

 with the names of the fertilizers used. Place the pots 

 in a window or light place, and keep the soil moist 

 ened. When the wheat seedlings come up, thin out 

 to the same number in each pot. Note the difference 

 in the color of the leaves in each pot. Which fertil- 

 izers give the greatest increase in growth? 



Make a complete record of this experiment in the 

 note-book. 



2. Effects of Lime on Soils 



To see the effect of lime on clay soil, make two clay 

 balls, one with water, and the other with lime water, and 

 set aside to dry. In a few days examine and see which 

 is more mellow. 



Repeat the experiment with water and humus-water 

 and note the result. 



Is lime used on soils in your neighborhood ? 



Fertilizers 



Showing average amount of nitrogen, phosphoric acid and 

 potash in fertilizers: 



Pounds per Ton. 



Substance. Nitrogen. Phos. Acid. Potash. 



Clover hay 40 Ibs. 10 Ibs. 40 Ibs. 



Straw 10 Ibs. 4 Ibs. 20 Ibs. 



Barnyard manure 10 Ibs. 6 Ibs. 9 Ibs. 



Wood ashes 60 Ibs. 160 Ibs. 



Burned bones 500 Ibs. 



Ground bones 400 Ibs. 



Problems 



1. Suppose a load of barnyard manure weighs a 

 ton. How many pornds of nitrogen in it? Of phos- 

 phoric acid ? Of potash ? 



