Ind. Evaluation of Soil and Plant Tissue Testa for the Prediction 



of Crop Nutrient RequirementsT To (l) investigate correlation 

 of soil tests for available phosphorus and potassium with crop 

 responses in field and greenhouse; and (2) correlate tissue tests 

 for N, P, and K, on crops grovm in the field with crop response 

 to fertilizer applications. 

 Agron. 696 CNC-16) 



Iowa The Improvement. Calibration and Use of Chemical Tests for 

 Determining the Fertilizer and Lime Needs of Iowa Soils. To (l) 

 correlate soil testing procedures with responses obtained from 

 field fertilizer studies; (2) study procedures and techniques 

 for determining lime requirement and readily available nitrogen, 

 phosphorus, potassium, and possibly other nutrients in order to 

 increase accuracy and rapidity of making tests; (3) investigate 

 various field sampling methods to determine procedures to give 

 most representative samples for analysis; (u) study influence 

 of time of year and previous cropping history on results obtained 

 in testing soils; and (5) summarize, analyze, and interpret data 

 on large number of soil samples submitted by farmers to the soil 

 testing lab. 



Agron., Soils 1190 



Ky. Evaluation and Revision of Sampling Methods and Procedures 



in Chemical Analyses of Soils ^nd CropsT (l) linprove sampling 

 techniques of plant materials; and (2) find and adapt simpler, 

 faster and more accurate methods of determination of K, Ca, Mg, 

 Mn, B, P, and N in soils and plants of Kentucky. 

 Agron., Agr. Chem., Soils 161 



Md. Study of Soil Tests to Improve Their Accuracy and Reliability . 



(l) Improve soil test thru study & development of new & better 

 techniques} and (2) learn conditions influencing reliability of 

 tests and make correlation with crop growth. 

 Agron. 0-55 



Mich. Development and Standardization of Methods of Determining 



Nutritional Requirements of Fruit Crops. To establish reliability 

 of plant analysis as a method of determining nutritional require- 

 ments of fruit crops. 

 Hort. 54 



Mo. Soil Tests and Fertilizer Response. To improve correlation 



between soil tests in the lab and field response to soil treatment. 

 Soils 229 



Miss. Correlating Soil Test with Vegetable Crop Growth and Yield 

 Response to Added Fertilizers. To learn influence of various 

 P and K applications on yield in different soil types of various 

 known fertility levels prior to treatment so that a plant response 

 soil fertility relationship will be used as a basis for fer- 

 tilizer recommendations. 

 Hort. HZ-1 



