10 



FUNDAMENTALS OF FRUIT PRODUCTION 



logging, puddling and baking, are those which lead to an increased water 

 requirement of the plant. 



Table 7. — Mean Water Requirements of Oats and Wheat with Different 



Fertilizer Treatments 



{From determinations made by Liebacher, Von Seelhorst, Bunrjer and Ohlmer^^) 



Mean Water Require- 

 ments FOR Oats 

 AND Wheat 



Fertilizer 



KN P.. 

 N P.. 

 NK.. 



N.. 



P K.. 



P.. 



Check.. 



K.. 



238 

 243 

 246 

 259 

 294 

 297 

 308 

 314 



Table 8. — Effects of Various Amounts op Nitrogen on the Water Require- 

 ment OF Plants 



{After Hellriegel ^2) 



Cultivation. — Bearing directly on this point are data obtained on the 

 effects of cultivation in lessening the water requirements of plants. Some 

 of these data are presented in Table 9. In every case the water require- 



Table ' 



-The Influence of Cultivation Upon Water Requirements of Plants 

 in Different Soils'"^ 



Not cultivated 



Cultivated 



Sandy loam . . , . 



Clay loam 



Clay 



Type not given . 



603 

 535 

 753 



451 



252 

 428 



582 

 265 



ment was materially reduced by cultivation; in one case it was more than 

 cut in two. In certain soils the influence of cultivation was much more 

 pronounced than in others. Presumably cultivation affects the water 



