SOME GENERAL PRINCIPLES 21 



it buries seeds too deepl}^ Tliere is the further 

 objection that they all grow in the line of the 

 grain plants and are more shaded than they would 

 be otherwise. Nevertheless, under some conditions 

 this method of sowing the plants is usually satis- 

 factory. 



One of the most satisfactory methods of sowing 

 clover seeds along with a nurse crop is to sow the 

 clover with a "seeder attachment;" that is, an at- 

 tachment for sowing small seeds, which will deposit 

 the same before or behind the grain tubes as may 

 be desired. The seed is thus sown at the same time 

 as the grain, and in the process is scattered evenly 

 over the surface of the ground. These seeder at- 

 tachments, however, Avill not sow all kinds of clover 

 and grass mixtures any more than will hand-sowing 

 machines do the same. 



Depth to Bury the Seed. — The depth to bury 

 the seed varies with the conditions of soil, climate 

 and season. Clover seeds, like those of grasses, are 

 buried most deeply in the light soils of the prairie 

 so light that they sink, so as to make walking over 

 them unusually tiresome when working on newly 

 plowed land, and in other instances so light as to 

 lift with the wind. On such soils the seeds may be 

 buried to the depth of 2 to 3 inches. On loam soils, 

 a covering of i inch or less would be ample, and on 

 stiff clays the covering may even be lighter under 

 normal conditions. 



Clover seeds are buried more deeply in dry than 

 in moist climates, and also more deeply in dry por- 

 tions of the year than when moisture is sufficient. 



