References
- McElhannon , W. S. and Mills , H. A. 1977 . Influence of percent NO3/NH4 on growth, N absorption, and assimilation by lima beans in solution culture . Agron. J. , 70 : 1027 – 1032 .
- Sasseville , D. N. and Mills , H. A. 1979 . N form and concentration: effects of N on absorption, growth and total N accumulation with southern peas . J. Amer. Soc. Hort. Sci. , 104 (5) : 586 – 591 .
- Harper , J. E. 1971 . Seasonal nutrient uptake and accumulation patterns in soybeans . Crop Sci. , 11 : 347 – 350 .
- Hanway , J. J. and Weber , C. R. 1971 . Accumulation of N, P, and K by soybean (Glycine max. L.) plants . Agron. J. , 63 : 406 – 408 .
- Hoagland , D. R. and Arnon , D. I. 1950 . The water culture method for growing plants without soil . Calif. Soil Sci. Plant Anal. , 9 : 107 – 113 .
- Mills , H. A. 1980 . Nitrogen specific ion electrodes in soil, plant and water analysis . J. Assoc. Off. Anal. Chem. , : 63
- Jones , J. B. Jr. 1977 . Elemental analysis of soil extracts and plant tissue ash by plasma emission spectroscopy . Comm. Soil Sci. Plant Anal. , 8 : 349 – 365 .
- McKee , H. S. 1962 . Nitrogen metabolism in plants , Oxford, , England : Clarendon Press .
- Eastin , E. F. 1978 . Use of an autoanalyzer for total nitrogen determination in plants . Comm. Soil Sci. Plant Anal. , 9 : 107 – 113 .
- Roy , R. N. and Wright , R. C. 1974 . Soybean growth and nutrient uptake in relation to soil fertility . Agron. J. , 66 : 5 – 8 .
- Spratt , E. D. 1974 . Effect of ammonia and nitrate forms of fertilizer‐N and their time of application on the utilization of N by wheat . Agron. J. , 66 : 57 – 61 .
- Graduate student, Professor and Associate Professor, respectively.