Effect of Sun and Shade on Pigment Development.

2. . Iron requirement for Chlorella. Bot. Gaz. 84: 407427. 1927. 3. JONES, H. W. The effect of ammonium sulphate upon the availability of iron in nutrient solutions. New Jersey Sta. Report. 405-409. 1920. 4. , and SHIVE, J. W. The influence of iron in the forms of ferric phosphate and ferrous sulphate upon the growth of wheat in a nutrient solution. Soil Sci. 11: 93-101. 1921. 5. Journal of the British Board of Agriculture. Flue dust (from iron works) as manure. 21: 1043-1064. 1915. 6. MARSH, R. P., and SHIVE, J. W. Adjustment of iron supply to requirements of soy bean in solution culture. Bot. Gaz. 79: 1-28. 1925. 7. ROGERS, C. H., and SHIVE, J. W. Iron in plants. Plant Physiol. 7: 231-251. 1932. 8. VLASYAK, P. A. Fertilizer studies on beets. Sovet Sakhar. 12: 48. 1935. 9. VOELCKER, J. A. Flue dust. Roy. Agr. Soc. England. Occasional Notes. no. 3: 4-5. 1918. 10. . The influence of iron compounds upon wheat. Jour. Royal Agr. Soc. Eng. 79: 263-284. 1919. 11. VURTHEN, A. Over de samenstelling van kaliasch. Verslag. Landb. Onderzock. Rijkslandbouw (Netherlands). 18: 86-90. 1915.