216 NATURE STUDY AND AGRICULTURE 



gather all the ears from each row separately and weigh, 

 adding to this the weight of the selected seed ears. The 

 most productive ears should be saved for the breeding plot 

 next year, while the best of the others should be saved for 

 general planting on the farm. Since a small breeding plot 

 will not produce enough seed for the entire farm, the seed 

 from this should be planted in a field by itself. From this 

 field and the breeding plot seed should be selected for the 

 next year's planting. In this way the productiveness of 

 the entire crop may be greatly increased in a few years. 



Books: Plant Breeding, De Vries. 



