I. CHEMISTRY 



A. Soil Reaction. Ion Exchange and 

 Availability of Nutrients 



Ariz • A Study of the Effect of Temperature Variation on Various 

 Chemical and Physical Soil Properties Which Affect Fertility. 

 To study the effect of temperature variations on the chemical & 

 physical properties of soils. Effect of: temperature on chemical 

 equilibria utilizing ion exchange resins, clay suspensions, & 

 soils; soil chemical reactions influenced by temperature on plant 

 & root growth; temperature on soil physical properties; natural 

 & artificial shading of soils on plant growth, & root growth. 

 Agr. Chem., Soils 289 



Calif. Lysimeter Investigations of the Gains. Losses, and Trsois- 



formations of Mineral Elements in Irrigated Soils. Study effects 

 of acid, neutral & alkaline-forming N fertilizers, cropping & 

 irrigation on yields, properties of soils, & gains & losses of 

 mineral elements in soil or added to soil. 

 Soils, Plant Nutr. 98? 



Calif. Fixation and Availability of Cations and Anions in Soils: 

 Chemical and Nutritional AspectsT To investigate (1) fixation 

 of cations in non-replaceable form, study of fixation by various 

 soil minerals, effects of grinding, etc.; (2) equilibria between 

 cations held in replaceable and non-replaceable forms and those 

 in the solution phase; (3) absorption of cations by crops with 

 special emphasis on the relation between absorption by plants 

 and the capacity of the soil to absorb cations; (4) fixation of 

 anions with references to iron, aluminum, calcium and other 

 bases; (5) penetration of anions into soil as influenced by 

 chemical and physical nature of the carrier; and (6) absorption 

 by various species of plsuits of fixed anions from soil. 

 Plant Nutr. 1023 



Calif. Micro-Elements in Relation to Crop Growth - 1. Absorption 

 of Micro-Elements by Plants and Physiological Functions. To 

 study (1) absorption of zinc, copper and other micro-elements 

 by different species of plants \inder controlled water culture 

 conditions; (2) effects of zinc deficiency on cjrtology of cell; 



(3) effects of manganese, copper and other micro-elements on 

 utilization of ammonia and nitrate nitrogen and on the respira- 

 tion of plants, grown xinder controlled water culture conditions; 



(4) interrelations between certain phjrtohoiwones and aicro- 

 elements; (5) relation of quality and intensity of light to 

 function of certain micro-elements; and (6) new micro-elements 

 essential to plant growth. 



Soils. Plant Hutr. 1024 



