10 



Ohio Use of the Spectrograph for Analysis of Soil Extracts 



and Plant Materials* To develop spectrographic techniques for 

 analysis of soil extracts, extracts of coal strip-mine spoil 

 material, and plants. 



Agron. 87 Coop. ARS 



Oreg. Development. Improvement and Calibration of Soil Tests to 

 Determine the Fertility Status of Oregon Soils. 1. Development 

 and Calibration of a Nitrogen Test for Oregon Soils. To (l) 

 develop an adequate method of testing soils for N; and (2) calibrate 

 N test with crop responses. 

 Soils 173-1 Coop ARS 



Pa. The Use of Surveys to Determine "Optimum Values" of Nutrient - 

 Element Leaf Concentrations. To determine leaf concentrations 

 of various essential elements in major horticultural crops which 

 are associated with desired responses as affected by fertiliza- 

 tion, soil, and climatic conditions. 

 Hort. 874-A 



Pa. Nutrient-Element Deficiencies in Horticultural Crop s. 



To study (l) use of leaf analyses in confirming visual diagnosis; 

 and (2) value of various nutrient-containing materials in cor- 

 recting these symptoms when applied to soil or as foliage sprays. 

 Hort. 874-B 



Pa. The Effects of Differential Nitrogen and Potassium Fer - 

 tilizer Treatments on Leaf Analysis, and Yields and Quality of 

 Apples. (1) Develop accurate nutritional standards for apple 

 trees through use of leaf analysis; and (2) establish a basis for 

 sound fertilizer recommendations in apple orchards in important 

 fruit growing areas of Pennsylvania. 

 Hort. 874-D 



P.R. Nutritive Status of Sxigarcane by Foliar Diagnosis. Learn re- 

 lation between content of N, P, K, or other elements in tissues of 

 cane and relative yields (percentage which actual yield of crop 

 is of maximim yield obtained with heavy applications of a nutrient 

 to the soil) of the cane represented by said plant tissue samples 

 considering; (l) What part of plant is most suitable; (2) when 

 tissue samples must be taken; (3) influence played by climate 

 and (4) influence of variety and soil. 

 Agron., Hort. 30 



P.R, Foliar Diagnosis for Pineapples. Learn relation between content 

 of N, P, and K, or other essential elements in suitable tissues of 

 pineapples and the "relative yields" of the pineapple represented 

 by said plant tissue samples considering; (l) what part of plant is 

 most suitable; (2) when tissue samples must be taken; (3) influence 

 played by external factors; (4) influence variety and soil; and (5) 

 what mathematical equation best approximates relation between plant 

 nutrient content and relative yields of said crop. 

 Agron., Hort. II6 



