PAGE 



Horticulture 587 



Citrus Fruits - 587 



New Plantings 587 



The Effect of Fertilizers and Cover Crops on Tree Growth 



and Yield 588 



The Effect of Temperature and Humidity 589 



Date Studies 589 



Propagation of Offshoots 589 



The Olive 590 



Water Requirement Studies 591 



Pruning Studies 591 



The Walnut and Pecan 591 



Irish Potatoes 592 



Sweet Potatoes — 593 



Variety Tests of Orchard Fruits 593 



Varieties at the Salt River Valley Farm 593 



Varieties at the Yuma Station 594 



Variety Grape Vineyards 594 



Bush Fruits : 594 



New Fruits 595 



Grape Analyses 595 



Variety Tests of Beets 595 



Irrigation Investigations 597 



Groundwater Studies 597 



Additional Water Supply for the University Campus 598 



Fuel Oils for Pumpmg 599 



Stream-Flow Measurements 599 



Effects of the Transpiration of Trees on the Groundwater Supply... .599 



Soil Surveys 600 



Methods of Irrigation in Casa Grande Valley 600 



Plant Breeding 601 



Alfalfa 601 



Cotton 601 



Wheat 602 



Inheritance of Earliness in Wheat 603 



Plant Pathology 606 



Work of the Department 606 



Date Rot 606 



Susceptibility of Various Dates to Date Rot. 609 



Control 609 



Cotton Black Arm and Angular Leaf-Spot 609 



Miscellaneous Studies 610 



Lettuce Rot 610 



Field Crops 611 



Orchard Trees 612 



Small Fruits 613 



Garden Vegetables 614 



Ornamental Plants 614 



Other Activities 615 



Poultry Husbandry 616 



