ko 



111. Soil Moisture as a Factor in the Growth and Yield of Corn . 

 To (l) obtain quantitative information on relation between dif- 

 ferent levels of soil moisture deficiency and growth and phys- 

 iologic behavior of corn at different growth stages; (2) deter- 

 mine efficiency of water use by corn at different levels of soil 

 moisture deficiency under fertility conditions and plant popula- 

 tions conducive to high yields; and (3) relate water use by corn 

 to open-pan evaporation and other climatic characteristics. 

 Agron. 1^-373 Coop. ARS 



111. Effect of Planting Method, Slope, Crop, and Weather Condi- 

 tions of Soil and Water Losses and Yields . (1) Learn effect of 

 seasonal variations in weather on soil and water losses from 

 land used in production of corn. Study (2) effect of slope on 

 soil and water losses during production; (3) planting methods 

 and their effect on soil and water losses and yields. 

 Dixon Springs UO-332 



N. C. Soil Fertility in Relation to Soybean Growth and Production . 

 To (1) determine relative importance and contributions of native 

 soil fertility, other properties of entire root zone, and sup- 

 plementary plant nutrients to growth and fruiting of soybeans; 

 and (2) study relationships between soil and environmental con- 

 ditions and crop in soybean growing areas of N. C. with special 

 reference to factors which are limiting yields. 

 Soils 118 



N. C. The Development of the Root System of Plants as Influenced 

 by the Environment . To (1) characterize root systems of agri- 

 culturally important species and their varieties in order to 

 determine certain aspects that may be used to differentiate 

 their adaptation; (2) determine change in root distribution that 

 may occur due to differences in soil properties and management 

 practices; and (3) determine effect of any interaction that may 

 occur within various pure and mixed plant populations. 

 Soils 120 



Ohio Factors Affecting Growth and Mineral Absorption by Plants . 

 1. Relative Significance of Degree of Base Saturation of the 

 Colloidal Soil Complex and the Total Quantity of Bases Present 

 in the Soil in the Absorption of Mineral by Plants . To evaluate 

 the relative significance of the quantity factor or total amount 

 of the ion present, and the intensity factor, or concentration 

 of the ion on the exchange complex, in the absorption of minerals 

 by plants, with particular reference to calcium, magnesium and 

 potassium. 



Agron. 1-1 



