NCT00056563 and NCT01076452.

Synopsis Under the conditions of this experiment the stalk was an important storage organ for sugar which, under some conditions, can be translocated to maintain dry weight growth of the kernels for extended periods in the absence of photosynthesis. It seems probable that sugar storage in the stalk provides most of the reservoir of readily mobile sucrose required to maintain relatively uniform kernel growth in spite of wide diurnal and day‐to‐day variation in photosynthesis.

Synopsis An investigation was conducted to develop methods for an over‐all analytical technique of corn leaf analysis. Samples were analyzed by use of a spectrometer for Sr, P, K, Ca, Mg, Mn, Cu, B, Al, Fe, and Zn. Computing equipment was used to speed and facilitate data conversion. Procedures for sampling, leaf washing, drying, grinding, mixing, ashing, and analysis were studied and modified, where necessary, to increase precision and accuracy with respect to all elements.

Aluminum salts undergo more extensive hydrolysis in acid soil and clay systems than in aqueous solutions of the same pH. The “increased hydrolysis” is accompanied by, and presumably is caused by, the sorption of the hydrolysis product which contains Al. As much as 0.2 mmol. of Al was removed from 10‐3M AlCl3 solution by 1 g. of montmorillonite; kaolinite and a soil clay sorbed comparable amounts of the hydrolysis product. During the “increased hydrolysis” reaction, 3 moles of H+ appeared for each mole of Al which hydrolyzed and was sorbed. When clays containing hydrolysis products were treated with dilute mineral acid, 3 moles of H+ were required for each mole of Al dissolved. Although it appears from the above that the sorbed substance is of composition Al(OH)3, the solubility product of gibbsite was not exceeded in many of the acid systems in which the “increased hydrolysis” occurred. It is suggested that the loss of Al(OH)3 from solution occurred through the deposition of Al(OH)3 units on clay surfaces.