PAGE 



Dairy Husbandry ^^ 



Experiment with dairy cows 464 



Milk substitutes for feeding calves 465 



Entomology 468 



Horticulture ^^ 



Citrus investigations jW 



Dates 470 



Olives 470 



The walnut and pecan 471 



Pruning studies 471 



Water requirement studies 471 



Horticultural plant introductions 473 



Irish potatoes 473 



Sweet potatoes 474 



Miscellaneous 474 



Irrigation Investigations 475 



'^The fuel oil situation 475 



Irrigation by flooding and the efficiency of irrigation 476 



Silt content studies of Gila River water 476 



Casa Grande Valley 476 



San Simon Valley 477 



San Pedro Valley 478 



Sulphur Spring Valley 479 



Yuma Mesa Experiment Station pumping plant 479 



The Chippewa pump 479 



Plant Breeding 480 



Poultry Husbandry 483 



ILLUSTRATIONS 



PAC« 



Fig. 1. Corn and cowpeas. This method of growing corn and covvpeas is 

 recommended for the valleys in the southern part of Arizona. (Salt 

 River Valley Experiment Farm, 1920) 441 



Fig. 2. Wheat variety test. Early Baart wheat on right, Arizona No. 39 on 

 left, and Kanred in center, planted the same day and given the same 

 conditions. Note the early maturity of Early Baart and Arizona 

 No. 39 compared with Kanred. Early maturity is a desirable feature 

 for southern Arizona 44l 



Fig. 3. Cooperative crop demonstration. Orange sorghum grown without 



irrigation — yield eight tons silage per acre. Navajo County 444 



Fig. 4. Four-year-old apple orchard near Sonoita, Arizona, being grown 



without irrigation 472 



Fig. 5. View in two-vear-old variety orchard. Salt River Valley Experiment 



Station '. 472 



