Oct. 15, 1V14 



Water Requirement of Plants 



35 



Neither variety of horse bean did well. The growth was fairly good 

 during the early period, but during the warm days of July the plants 

 wilted down badly, despite an ample water supply, and had to be 

 harvested before they had reached maturity. The water requirement, 

 notwithstanding this, is no higher than that of many of the other 

 legumes, and compares favorably in this respect with hairy and with 

 purple vetch. The navy bean, although not as efficient as the cowpea and 

 the soy bean, is more efficient than the Mexican bean, which required 13 

 per cent more water. The Canada field pea and the Mexican bean were 

 equally efficient.' 



Crimson clover, on the basis of the combined crop, required practically 

 the same quantity of water as red clover. Crimson clover produced only 

 one crop and grew slowly throughout the period, although in total pro- 

 duction it was practically the equal of red clover. The water require- 

 ment of red clover is slightly below that of Grimm alfalfa, while Peruvian 

 alfalfa required only 78 per cent as much water as Grimm for the pro- 



^ Peas and beans were included by Lawcs (1850, p. r,.\) in liis experiments at Rothamstead. HuKland. 

 His measurancnts show beans lo be slightly more efficient than peas. No other measurements of pc.is 

 and beans have been made, so far as the writers are aware. 



