3i6 



THE CEREALS IN AMERICA 



Nitrogen may be obtained b}- applying sixteen grams of dried blood or twelvo 

 grams of nitrate of soda ; phosphorus by applying twenty-four grams of acid rock 

 phosphate or dissolved boneblack; and potassium by applying four grams of potas- 

 sium clilorids. The fertilizers should be thoroughly mixed with the soil to a depth 

 of six inches. 



433. Influence of Size of Seed on Early Stages of Plant Growth.— 

 Divide sample of oats into large, medium and small grains. This may be done by 

 hajid selection or by means of a nest of sieves. Obtain weight of fifty grains of 



000000 

 0000000 



000000 

 0^0 o 0^0 o o 



00 0000 

 0000000 



000000 

 00000 00 



00 0000 

 000 0000 



000000 

 o^<^^<^^o o o o 



000000 

 0^0 00 o o o 



oVo^oVo'^o 



'U O U U "J U U 



f. n n n n o n r> 



o o 00 a 



DO O O O 



0000a 



d 



On the right, a nest of sieves for cleaning seeds ; on the left, sieves with holes of 

 various siies, forms and positions. For further information see U. S. Dept. of 

 Agr. Yearboolt 1 894, p. 406. 



each and plant under similar conditions either in the field or in the plant house, 

 taking care to cover the seeds a uniform depth. If in pots or trays in pot house, 

 the soil can be removed more easily from the roots. 



Note time required for plants to come up and number of plants produced. Obtain 

 average height at end of each week. At end of three or four weeks, depending upon 

 growth, obtain fresli and water-free weight of each lot of seedlings. Make sketches 

 of the more important differences in roots and leaves of the different lots, if any. 



434. Influence of Tfkatment of Seed Upon Germination.— Having 

 carefully graded a sufficient quantity of oats, treat fifty grains each of the following 

 ways: 



